https://github.com/facebook/rocksdb
Tip revision: 791a7fe4023ac795072a9e0cbfc679a3764a2ba0 authored by Andrew Kryczka on 01 September 2023, 20:45:29 UTC
update HISTORY.md and version.h for 8.3.3
update HISTORY.md and version.h for 8.3.3
Tip revision: 791a7fe
db_range_del_test.cc
// Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/db_test_util.h"
#include "db/version_set.h"
#include "port/stack_trace.h"
#include "rocksdb/utilities/write_batch_with_index.h"
#include "test_util/testutil.h"
#include "util/random.h"
#include "utilities/merge_operators.h"
namespace ROCKSDB_NAMESPACE {
// TODO(cbi): parameterize the test to cover user-defined timestamp cases
class DBRangeDelTest : public DBTestBase {
public:
DBRangeDelTest() : DBTestBase("db_range_del_test", /*env_do_fsync=*/false) {}
std::string GetNumericStr(int key) {
uint64_t uint64_key = static_cast<uint64_t>(key);
std::string str;
str.resize(8);
memcpy(&str[0], static_cast<void*>(&uint64_key), 8);
return str;
}
};
TEST_F(DBRangeDelTest, NonBlockBasedTableNotSupported) {
// TODO: figure out why MmapReads trips the iterator pinning assertion in
// RangeDelAggregator. Ideally it would be supported; otherwise it should at
// least be explicitly unsupported.
for (auto config : {kPlainTableAllBytesPrefix, /* kWalDirAndMmapReads */}) {
option_config_ = config;
DestroyAndReopen(CurrentOptions());
ASSERT_TRUE(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"dr1", "dr1")
.IsNotSupported());
}
}
TEST_F(DBRangeDelTest, WriteBatchWithIndexNotSupported) {
WriteBatchWithIndex indexedBatch{};
ASSERT_TRUE(indexedBatch.DeleteRange(db_->DefaultColumnFamily(), "dr1", "dr1")
.IsNotSupported());
ASSERT_TRUE(indexedBatch.DeleteRange("dr1", "dr1").IsNotSupported());
}
TEST_F(DBRangeDelTest, EndSameAsStartCoversNothing) {
ASSERT_OK(db_->Put(WriteOptions(), "b", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "b", "b"));
ASSERT_EQ("val", Get("b"));
}
TEST_F(DBRangeDelTest, EndComesBeforeStartInvalidArgument) {
ASSERT_OK(db_->Put(WriteOptions(), "b", "val"));
ASSERT_TRUE(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "b", "a")
.IsInvalidArgument());
ASSERT_EQ("val", Get("b"));
}
TEST_F(DBRangeDelTest, FlushOutputHasOnlyRangeTombstones) {
do {
DestroyAndReopen(CurrentOptions());
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"dr1", "dr2"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
} while (ChangeOptions(kRangeDelSkipConfigs));
}
TEST_F(DBRangeDelTest, DictionaryCompressionWithOnlyRangeTombstones) {
Options opts = CurrentOptions();
opts.compression_opts.max_dict_bytes = 16384;
Reopen(opts);
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "dr1",
"dr2"));
ASSERT_OK(db_->Flush(FlushOptions()));
}
TEST_F(DBRangeDelTest, CompactionOutputHasOnlyRangeTombstone) {
do {
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
opts.statistics = CreateDBStatistics();
DestroyAndReopen(opts);
// snapshot protects range tombstone from dropping due to becoming obsolete.
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_EQ(0, TestGetTickerCount(opts, COMPACTION_RANGE_DEL_DROP_OBSOLETE));
db_->ReleaseSnapshot(snapshot);
// Skip cuckoo memtables, which do not support snapshots. Skip non-leveled
// compactions as the above assertions about the number of files in a level
// do not hold true.
} while (ChangeOptions(kRangeDelSkipConfigs | kSkipUniversalCompaction |
kSkipFIFOCompaction));
}
TEST_F(DBRangeDelTest, CompactionOutputFilesExactlyFilled) {
// regression test for exactly filled compaction output files. Previously
// another file would be generated containing all range deletions, which
// could invalidate the non-overlapping file boundary invariant.
const int kNumPerFile = 4, kNumFiles = 2, kFileBytes = 9 << 10;
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.level0_file_num_compaction_trigger = kNumFiles;
options.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
options.num_levels = 2;
options.target_file_size_base = kFileBytes;
BlockBasedTableOptions table_options;
table_options.block_size_deviation = 50; // each block holds two keys
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
Reopen(options);
// snapshot protects range tombstone from dropping due to becoming obsolete.
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(1)));
Random rnd(301);
for (int i = 0; i < kNumFiles; ++i) {
std::vector<std::string> values;
// Write 12K (4 values, each 3K)
for (int j = 0; j < kNumPerFile; j++) {
values.push_back(rnd.RandomString(3 << 10));
ASSERT_OK(Put(Key(i * kNumPerFile + j), values[j]));
if (j == 0 && i > 0) {
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
}
}
}
// put extra key to trigger final flush
ASSERT_OK(Put("", ""));
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
ASSERT_EQ(kNumFiles, NumTableFilesAtLevel(0));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(2, NumTableFilesAtLevel(1));
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, MaxCompactionBytesCutsOutputFiles) {
// Ensures range deletion spanning multiple compaction output files that are
// cut by max_compaction_bytes will have non-overlapping key-ranges.
// https://github.com/facebook/rocksdb/issues/1778
const int kNumFiles = 2, kNumPerFile = 1 << 8, kBytesPerVal = 1 << 12;
Options opts = CurrentOptions();
opts.comparator = test::Uint64Comparator();
opts.disable_auto_compactions = true;
opts.level0_file_num_compaction_trigger = kNumFiles;
opts.max_compaction_bytes = kNumPerFile * kBytesPerVal;
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
// Want max_compaction_bytes to trigger the end of compaction output file, not
// target_file_size_base, so make the latter much bigger
// opts.target_file_size_base = 100 * opts.max_compaction_bytes;
opts.target_file_size_base = 1;
DestroyAndReopen(opts);
// snapshot protects range tombstone from dropping due to becoming obsolete.
const Snapshot* snapshot = db_->GetSnapshot();
Random rnd(301);
ASSERT_OK(Put(GetNumericStr(0), rnd.RandomString(kBytesPerVal)));
ASSERT_OK(
Put(GetNumericStr(kNumPerFile - 1), rnd.RandomString(kBytesPerVal)));
ASSERT_OK(Flush());
ASSERT_OK(Put(GetNumericStr(kNumPerFile), rnd.RandomString(kBytesPerVal)));
ASSERT_OK(
Put(GetNumericStr(kNumPerFile * 2 - 1), rnd.RandomString(kBytesPerVal)));
ASSERT_OK(Flush());
MoveFilesToLevel(2);
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(NumTableFilesAtLevel(2), 2);
ASSERT_OK(
db_->SetOptions(db_->DefaultColumnFamily(),
{{"target_file_size_base",
std::to_string(100 * opts.max_compaction_bytes)}}));
// It spans the whole key-range, thus will be included in all output files
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
GetNumericStr(0),
GetNumericStr(kNumFiles * kNumPerFile - 1)));
for (int i = 0; i < kNumFiles; ++i) {
std::vector<std::string> values;
// Write 1MB (256 values, each 4K)
for (int j = 0; j < kNumPerFile; j++) {
values.push_back(rnd.RandomString(kBytesPerVal));
ASSERT_OK(Put(GetNumericStr(kNumPerFile * i + j), values[j]));
}
// extra entry to trigger SpecialSkipListFactory's flush
ASSERT_OK(Put(GetNumericStr(kNumPerFile), ""));
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
ASSERT_EQ(i + 1, NumTableFilesAtLevel(0));
}
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr,
/*column_family=*/nullptr,
/*disallow_trivial_move=*/true));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_GE(NumTableFilesAtLevel(1), 2);
std::vector<std::vector<FileMetaData>> files;
dbfull()->TEST_GetFilesMetaData(db_->DefaultColumnFamily(), &files);
for (size_t i = 0; i + 1 < files[1].size(); ++i) {
ASSERT_TRUE(InternalKeyComparator(opts.comparator)
.Compare(files[1][i].largest, files[1][i + 1].smallest) <
0);
}
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, SentinelsOmittedFromOutputFile) {
// Regression test for bug where sentinel range deletions (i.e., ones with
// sequence number of zero) were included in output files.
// snapshot protects range tombstone from dropping due to becoming obsolete.
const Snapshot* snapshot = db_->GetSnapshot();
// gaps between ranges creates sentinels in our internal representation
std::vector<std::pair<std::string, std::string>> range_dels = {
{"a", "b"}, {"c", "d"}, {"e", "f"}};
for (const auto& range_del : range_dels) {
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
range_del.first, range_del.second));
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
std::vector<std::vector<FileMetaData>> files;
dbfull()->TEST_GetFilesMetaData(db_->DefaultColumnFamily(), &files);
ASSERT_GT(files[0][0].fd.smallest_seqno, 0);
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, FlushRangeDelsSameStartKey) {
ASSERT_OK(db_->Put(WriteOptions(), "b1", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "c"));
ASSERT_OK(db_->Put(WriteOptions(), "b2", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "b"));
// first iteration verifies query correctness in memtable, second verifies
// query correctness for a single SST file
for (int i = 0; i < 2; ++i) {
if (i > 0) {
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
}
std::string value;
ASSERT_TRUE(db_->Get(ReadOptions(), "b1", &value).IsNotFound());
ASSERT_OK(db_->Get(ReadOptions(), "b2", &value));
}
}
TEST_F(DBRangeDelTest, CompactRangeDelsSameStartKey) {
ASSERT_OK(db_->Put(WriteOptions(), "unused",
"val")); // prevents empty after compaction
ASSERT_OK(db_->Put(WriteOptions(), "b1", "val"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "c"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "b"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(3, NumTableFilesAtLevel(0));
for (int i = 0; i < 2; ++i) {
if (i > 0) {
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
}
std::string value;
ASSERT_TRUE(db_->Get(ReadOptions(), "b1", &value).IsNotFound());
}
}
TEST_F(DBRangeDelTest, FlushRemovesCoveredKeys) {
const int kNum = 300, kRangeBegin = 50, kRangeEnd = 250;
Options opts = CurrentOptions();
opts.comparator = test::Uint64Comparator();
DestroyAndReopen(opts);
// Write a third before snapshot, a third between snapshot and tombstone, and
// a third after the tombstone. Keys older than snapshot or newer than the
// tombstone should be preserved.
const Snapshot* snapshot = nullptr;
for (int i = 0; i < kNum; ++i) {
if (i == kNum / 3) {
snapshot = db_->GetSnapshot();
} else if (i == 2 * kNum / 3) {
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
GetNumericStr(kRangeBegin),
GetNumericStr(kRangeEnd)));
}
ASSERT_OK(db_->Put(WriteOptions(), GetNumericStr(i), "val"));
}
ASSERT_OK(db_->Flush(FlushOptions()));
for (int i = 0; i < kNum; ++i) {
ReadOptions read_opts;
read_opts.ignore_range_deletions = true;
std::string value;
if (i < kRangeBegin || i > kRangeEnd || i < kNum / 3 || i >= 2 * kNum / 3) {
ASSERT_OK(db_->Get(read_opts, GetNumericStr(i), &value));
} else {
ASSERT_TRUE(db_->Get(read_opts, GetNumericStr(i), &value).IsNotFound());
}
}
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, CompactionRemovesCoveredKeys) {
const int kNumPerFile = 100, kNumFiles = 4;
Options opts = CurrentOptions();
opts.comparator = test::Uint64Comparator();
opts.disable_auto_compactions = true;
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
opts.num_levels = 2;
opts.statistics = CreateDBStatistics();
DestroyAndReopen(opts);
for (int i = 0; i < kNumFiles; ++i) {
if (i > 0) {
// range tombstone covers first half of the previous file
ASSERT_OK(db_->DeleteRange(
WriteOptions(), db_->DefaultColumnFamily(),
GetNumericStr((i - 1) * kNumPerFile),
GetNumericStr((i - 1) * kNumPerFile + kNumPerFile / 2)));
}
// Make sure a given key appears in each file so compaction won't be able to
// use trivial move, which would happen if the ranges were non-overlapping.
// Also, we need an extra element since flush is only triggered when the
// number of keys is one greater than SpecialSkipListFactory's limit.
// We choose a key outside the key-range used by the test to avoid conflict.
ASSERT_OK(db_->Put(WriteOptions(), GetNumericStr(kNumPerFile * kNumFiles),
"val"));
for (int j = 0; j < kNumPerFile; ++j) {
ASSERT_OK(
db_->Put(WriteOptions(), GetNumericStr(i * kNumPerFile + j), "val"));
}
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
ASSERT_EQ(i + 1, NumTableFilesAtLevel(0));
}
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_GT(NumTableFilesAtLevel(1), 0);
ASSERT_EQ((kNumFiles - 1) * kNumPerFile / 2,
TestGetTickerCount(opts, COMPACTION_KEY_DROP_RANGE_DEL));
for (int i = 0; i < kNumFiles; ++i) {
for (int j = 0; j < kNumPerFile; ++j) {
ReadOptions read_opts;
read_opts.ignore_range_deletions = true;
std::string value;
if (i == kNumFiles - 1 || j >= kNumPerFile / 2) {
ASSERT_OK(
db_->Get(read_opts, GetNumericStr(i * kNumPerFile + j), &value));
} else {
ASSERT_TRUE(
db_->Get(read_opts, GetNumericStr(i * kNumPerFile + j), &value)
.IsNotFound());
}
}
}
}
TEST_F(DBRangeDelTest, ValidLevelSubcompactionBoundaries) {
const int kNumPerFile = 100, kNumFiles = 4, kFileBytes = 100 << 10;
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.level0_file_num_compaction_trigger = kNumFiles;
options.max_bytes_for_level_base = 2 * kFileBytes;
options.max_subcompactions = 4;
options.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
options.num_levels = 3;
options.target_file_size_base = kFileBytes;
options.target_file_size_multiplier = 1;
options.max_compaction_bytes = 1500;
Reopen(options);
Random rnd(301);
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < kNumFiles; ++j) {
if (i > 0) {
// delete [95,105) in two files, [295,305) in next two
int mid = (j + (1 - j % 2)) * kNumPerFile;
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(mid - 5), Key(mid + 5)));
}
std::vector<std::string> values;
// Write 100KB (100 values, each 1K)
for (int k = 0; k < kNumPerFile; k++) {
values.push_back(rnd.RandomString(990));
ASSERT_OK(Put(Key(j * kNumPerFile + k), values[k]));
}
// put extra key to trigger flush
ASSERT_OK(Put("", ""));
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
if (j < kNumFiles - 1) {
// background compaction may happen early for kNumFiles'th file
ASSERT_EQ(NumTableFilesAtLevel(0), j + 1);
}
if (j == options.level0_file_num_compaction_trigger - 1) {
// When i == 1, compaction will output some files to L1, at which point
// L1 is not bottommost so range deletions cannot be compacted away. The
// new L1 files must be generated with non-overlapping key ranges even
// though multiple subcompactions see the same ranges deleted, else an
// assertion will fail.
//
// Only enable auto-compactions when we're ready; otherwise, the
// oversized L0 (relative to base_level) causes the compaction to run
// earlier.
ASSERT_OK(db_->EnableAutoCompaction({db_->DefaultColumnFamily()}));
ASSERT_OK(dbfull()->TEST_WaitForCompact());
ASSERT_OK(db_->SetOptions(db_->DefaultColumnFamily(),
{{"disable_auto_compactions", "true"}}));
ASSERT_EQ(NumTableFilesAtLevel(0), 0);
ASSERT_GT(NumTableFilesAtLevel(1), 0);
ASSERT_GT(NumTableFilesAtLevel(2), 0);
}
}
}
}
TEST_F(DBRangeDelTest, ValidUniversalSubcompactionBoundaries) {
const int kNumPerFile = 100, kFilesPerLevel = 4, kNumLevels = 4;
Options options = CurrentOptions();
options.compaction_options_universal.min_merge_width = kFilesPerLevel;
options.compaction_options_universal.max_merge_width = kFilesPerLevel;
options.compaction_options_universal.size_ratio = 10;
options.compaction_style = kCompactionStyleUniversal;
options.level0_file_num_compaction_trigger = kFilesPerLevel;
options.max_subcompactions = 4;
options.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
options.num_levels = kNumLevels;
options.target_file_size_base = kNumPerFile << 10;
options.target_file_size_multiplier = 1;
Reopen(options);
Random rnd(301);
for (int i = 0; i < kNumLevels - 1; ++i) {
for (int j = 0; j < kFilesPerLevel; ++j) {
if (i == kNumLevels - 2) {
// insert range deletions [95,105) in two files, [295,305) in next two
// to prepare L1 for later manual compaction.
int mid = (j + (1 - j % 2)) * kNumPerFile;
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(mid - 5), Key(mid + 5)));
}
std::vector<std::string> values;
// Write 100KB (100 values, each 1K)
for (int k = 0; k < kNumPerFile; k++) {
// For the highest level, use smaller value size such that it does not
// prematurely cause auto compaction due to range tombstone adding
// additional compensated file size
values.push_back(rnd.RandomString((i == kNumLevels - 2) ? 600 : 990));
ASSERT_OK(Put(Key(j * kNumPerFile + k), values[k]));
}
// put extra key to trigger flush
ASSERT_OK(Put("", ""));
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
if (j < kFilesPerLevel - 1) {
// background compaction may happen early for kFilesPerLevel'th file
ASSERT_EQ(NumTableFilesAtLevel(0), j + 1);
}
}
ASSERT_OK(dbfull()->TEST_WaitForCompact());
ASSERT_EQ(NumTableFilesAtLevel(0), 0);
if (i == kNumLevels - 2) {
// For the highest level, value size is smaller (see Put() above),
// so output file number is smaller.
ASSERT_GT(NumTableFilesAtLevel(kNumLevels - 1 - i), kFilesPerLevel - 2);
} else {
ASSERT_GT(NumTableFilesAtLevel(kNumLevels - 1 - i), kFilesPerLevel - 1);
}
}
// Now L1-L3 are full, when we compact L1->L2 we should see (1) subcompactions
// happen since input level > 0; (2) range deletions are not dropped since
// output level is not bottommost. If no file boundary assertion fails, that
// probably means universal compaction + subcompaction + range deletion are
// compatible.
ASSERT_OK(dbfull()->RunManualCompaction(
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd(),
1 /* input_level */, 2 /* output_level */, CompactRangeOptions(),
nullptr /* begin */, nullptr /* end */, true /* exclusive */,
true /* disallow_trivial_move */,
std::numeric_limits<uint64_t>::max() /* max_file_num_to_ignore */,
"" /*trim_ts*/));
}
TEST_F(DBRangeDelTest, CompactionRemovesCoveredMergeOperands) {
const int kNumPerFile = 3, kNumFiles = 3;
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(2 * kNumPerFile));
opts.merge_operator = MergeOperators::CreateUInt64AddOperator();
opts.num_levels = 2;
Reopen(opts);
// Iterates kNumFiles * kNumPerFile + 1 times since flushing the last file
// requires an extra entry.
for (int i = 0; i <= kNumFiles * kNumPerFile; ++i) {
if (i % kNumPerFile == 0 && i / kNumPerFile == kNumFiles - 1) {
// Delete merge operands from all but the last file
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"key", "key_"));
}
std::string val;
PutFixed64(&val, i);
ASSERT_OK(db_->Merge(WriteOptions(), "key", val));
// we need to prevent trivial move using Puts so compaction will actually
// process the merge operands.
ASSERT_OK(db_->Put(WriteOptions(), "prevent_trivial_move", ""));
if (i > 0 && i % kNumPerFile == 0) {
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
}
}
ReadOptions read_opts;
read_opts.ignore_range_deletions = true;
std::string expected, actual;
ASSERT_OK(db_->Get(read_opts, "key", &actual));
PutFixed64(&expected, 45); // 1+2+...+9
ASSERT_EQ(expected, actual);
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
expected.clear();
ASSERT_OK(db_->Get(read_opts, "key", &actual));
uint64_t tmp;
Slice tmp2(actual);
GetFixed64(&tmp2, &tmp);
PutFixed64(&expected, 30); // 6+7+8+9 (earlier operands covered by tombstone)
ASSERT_EQ(expected, actual);
}
TEST_F(DBRangeDelTest, PutDeleteRangeMergeFlush) {
// Test the sequence of operations: (1) Put, (2) DeleteRange, (3) Merge, (4)
// Flush. The `CompactionIterator` previously had a bug where we forgot to
// check for covering range tombstones when processing the (1) Put, causing
// it to reappear after the flush.
Options opts = CurrentOptions();
opts.merge_operator = MergeOperators::CreateUInt64AddOperator();
Reopen(opts);
std::string val;
PutFixed64(&val, 1);
ASSERT_OK(db_->Put(WriteOptions(), "key", val));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "key",
"key_"));
ASSERT_OK(db_->Merge(WriteOptions(), "key", val));
ASSERT_OK(db_->Flush(FlushOptions()));
ReadOptions read_opts;
std::string expected, actual;
ASSERT_OK(db_->Get(read_opts, "key", &actual));
PutFixed64(&expected, 1);
ASSERT_EQ(expected, actual);
}
TEST_F(DBRangeDelTest, ObsoleteTombstoneCleanup) {
// During compaction to bottommost level, verify range tombstones older than
// the oldest snapshot are removed, while others are preserved.
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
opts.num_levels = 2;
opts.statistics = CreateDBStatistics();
Reopen(opts);
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "dr1",
"dr10")); // obsolete after compaction
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));
ASSERT_OK(db_->Flush(FlushOptions()));
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "dr2",
"dr20")); // protected by snapshot
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(2, NumTableFilesAtLevel(0));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_EQ(1, TestGetTickerCount(opts, COMPACTION_RANGE_DEL_DROP_OBSOLETE));
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, TableEvictedDuringScan) {
// The RangeDelAggregator holds pointers into range deletion blocks created by
// table readers. This test ensures the aggregator can still access those
// blocks even if it outlives the table readers that created them.
//
// DBIter always keeps readers open for L0 files. So, in order to test
// aggregator outliving reader, we need to have deletions in L1 files, which
// are opened/closed on-demand during the scan. This is accomplished by
// setting kNumRanges > level0_stop_writes_trigger, which prevents deletions
// from all lingering in L0 (there is at most one range deletion per L0 file).
//
// The first L1 file will contain a range deletion since its begin key is 0.
// SeekToFirst() references that table's reader and adds its range tombstone
// to the aggregator. Upon advancing beyond that table's key-range via Next(),
// the table reader will be unreferenced by the iterator. Since we manually
// call Evict() on all readers before the full scan, this unreference causes
// the reader's refcount to drop to zero and thus be destroyed.
//
// When it is destroyed, we do not remove its range deletions from the
// aggregator. So, subsequent calls to Next() must be able to use these
// deletions to decide whether a key is covered. This will work as long as
// the aggregator properly references the range deletion block.
const int kNum = 25, kRangeBegin = 0, kRangeEnd = 7, kNumRanges = 5;
Options opts = CurrentOptions();
opts.comparator = test::Uint64Comparator();
opts.level0_file_num_compaction_trigger = 4;
opts.level0_stop_writes_trigger = 4;
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(1));
opts.num_levels = 2;
BlockBasedTableOptions bbto;
bbto.cache_index_and_filter_blocks = true;
bbto.block_cache = NewLRUCache(8 << 20);
opts.table_factory.reset(NewBlockBasedTableFactory(bbto));
DestroyAndReopen(opts);
// Hold a snapshot so range deletions can't become obsolete during compaction
// to bottommost level (i.e., L1).
const Snapshot* snapshot = db_->GetSnapshot();
for (int i = 0; i < kNum; ++i) {
ASSERT_OK(db_->Put(WriteOptions(), GetNumericStr(i), "val"));
if (i > 0) {
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
}
if (i >= kNum / 2 && i < kNum / 2 + kNumRanges) {
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
GetNumericStr(kRangeBegin),
GetNumericStr(kRangeEnd)));
}
}
// Must be > 1 so the first L1 file can be closed before scan finishes
ASSERT_OK(dbfull()->TEST_WaitForCompact());
ASSERT_GT(NumTableFilesAtLevel(1), 1);
std::vector<uint64_t> file_numbers = ListTableFiles(env_, dbname_);
ReadOptions read_opts;
auto* iter = db_->NewIterator(read_opts);
ASSERT_OK(iter->status());
int expected = kRangeEnd;
iter->SeekToFirst();
for (auto file_number : file_numbers) {
// This puts table caches in the state of being externally referenced only
// so they are destroyed immediately upon iterator unreferencing.
TableCache::Evict(dbfull()->TEST_table_cache(), file_number);
}
for (; iter->Valid(); iter->Next()) {
ASSERT_EQ(GetNumericStr(expected), iter->key());
++expected;
// Keep clearing block cache's LRU so range deletion block can be freed as
// soon as its refcount drops to zero.
bbto.block_cache->EraseUnRefEntries();
}
ASSERT_EQ(kNum, expected);
delete iter;
db_->ReleaseSnapshot(snapshot);
// Also test proper cache handling in GetRangeTombstoneIterator,
// via TablesRangeTombstoneSummary. (This once triggered memory leak
// report with ASAN.)
opts.max_open_files = 1;
Reopen(opts);
std::string str;
ASSERT_OK(dbfull()->TablesRangeTombstoneSummary(db_->DefaultColumnFamily(),
100, &str));
}
TEST_F(DBRangeDelTest, GetCoveredKeyFromMutableMemtable) {
do {
DestroyAndReopen(CurrentOptions());
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ReadOptions read_opts;
std::string value;
ASSERT_TRUE(db_->Get(read_opts, "key", &value).IsNotFound());
} while (ChangeOptions(kRangeDelSkipConfigs));
}
TEST_F(DBRangeDelTest, GetCoveredKeyFromImmutableMemtable) {
do {
Options opts = CurrentOptions();
opts.max_write_buffer_number = 3;
opts.min_write_buffer_number_to_merge = 2;
// SpecialSkipListFactory lets us specify maximum number of elements the
// memtable can hold. It switches the active memtable to immutable (flush is
// prevented by the above options) upon inserting an element that would
// overflow the memtable.
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(1));
DestroyAndReopen(opts);
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Put(WriteOptions(), "blah", "val"));
ReadOptions read_opts;
std::string value;
ASSERT_TRUE(db_->Get(read_opts, "key", &value).IsNotFound());
} while (ChangeOptions(kRangeDelSkipConfigs));
}
TEST_F(DBRangeDelTest, GetCoveredKeyFromSst) {
do {
DestroyAndReopen(CurrentOptions());
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));
// snapshot prevents key from being deleted during flush
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Flush(FlushOptions()));
ReadOptions read_opts;
std::string value;
ASSERT_TRUE(db_->Get(read_opts, "key", &value).IsNotFound());
db_->ReleaseSnapshot(snapshot);
} while (ChangeOptions(kRangeDelSkipConfigs));
}
TEST_F(DBRangeDelTest, GetCoveredMergeOperandFromMemtable) {
const int kNumMergeOps = 10;
Options opts = CurrentOptions();
opts.merge_operator = MergeOperators::CreateUInt64AddOperator();
Reopen(opts);
for (int i = 0; i < kNumMergeOps; ++i) {
std::string val;
PutFixed64(&val, i);
ASSERT_OK(db_->Merge(WriteOptions(), "key", val));
if (i == kNumMergeOps / 2) {
// deletes [0, 5]
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"key", "key_"));
}
}
ReadOptions read_opts;
std::string expected, actual;
ASSERT_OK(db_->Get(read_opts, "key", &actual));
PutFixed64(&expected, 30); // 6+7+8+9
ASSERT_EQ(expected, actual);
expected.clear();
read_opts.ignore_range_deletions = true;
ASSERT_OK(db_->Get(read_opts, "key", &actual));
PutFixed64(&expected, 45); // 0+1+2+...+9
ASSERT_EQ(expected, actual);
}
TEST_F(DBRangeDelTest, GetIgnoresRangeDeletions) {
Options opts = CurrentOptions();
opts.max_write_buffer_number = 4;
opts.min_write_buffer_number_to_merge = 3;
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(1));
Reopen(opts);
ASSERT_OK(db_->Put(WriteOptions(), "sst_key", "val"));
// snapshot prevents key from being deleted during flush
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_OK(db_->Put(WriteOptions(), "imm_key", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Put(WriteOptions(), "mem_key", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ReadOptions read_opts;
read_opts.ignore_range_deletions = true;
for (std::string key : {"sst_key", "imm_key", "mem_key"}) {
std::string value;
ASSERT_OK(db_->Get(read_opts, key, &value));
}
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, IteratorRemovesCoveredKeys) {
const int kNum = 200, kRangeBegin = 50, kRangeEnd = 150, kNumPerFile = 25;
Options opts = CurrentOptions();
opts.comparator = test::Uint64Comparator();
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
DestroyAndReopen(opts);
// Write half of the keys before the tombstone and half after the tombstone.
// Only covered keys (i.e., within the range and older than the tombstone)
// should be deleted.
for (int i = 0; i < kNum; ++i) {
if (i == kNum / 2) {
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
GetNumericStr(kRangeBegin),
GetNumericStr(kRangeEnd)));
}
ASSERT_OK(db_->Put(WriteOptions(), GetNumericStr(i), "val"));
}
ReadOptions read_opts;
auto* iter = db_->NewIterator(read_opts);
ASSERT_OK(iter->status());
int expected = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_EQ(GetNumericStr(expected), iter->key());
if (expected == kRangeBegin - 1) {
expected = kNum / 2;
} else {
++expected;
}
}
ASSERT_EQ(kNum, expected);
delete iter;
}
TEST_F(DBRangeDelTest, IteratorOverUserSnapshot) {
const int kNum = 200, kRangeBegin = 50, kRangeEnd = 150, kNumPerFile = 25;
Options opts = CurrentOptions();
opts.comparator = test::Uint64Comparator();
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(kNumPerFile));
DestroyAndReopen(opts);
const Snapshot* snapshot = nullptr;
// Put a snapshot before the range tombstone, verify an iterator using that
// snapshot sees all inserted keys.
for (int i = 0; i < kNum; ++i) {
if (i == kNum / 2) {
snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
GetNumericStr(kRangeBegin),
GetNumericStr(kRangeEnd)));
}
ASSERT_OK(db_->Put(WriteOptions(), GetNumericStr(i), "val"));
}
ReadOptions read_opts;
read_opts.snapshot = snapshot;
auto* iter = db_->NewIterator(read_opts);
ASSERT_OK(iter->status());
int expected = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_EQ(GetNumericStr(expected), iter->key());
++expected;
}
ASSERT_EQ(kNum / 2, expected);
delete iter;
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, IteratorIgnoresRangeDeletions) {
Options opts = CurrentOptions();
opts.max_write_buffer_number = 4;
opts.min_write_buffer_number_to_merge = 3;
opts.memtable_factory.reset(test::NewSpecialSkipListFactory(1));
Reopen(opts);
ASSERT_OK(db_->Put(WriteOptions(), "sst_key", "val"));
// snapshot prevents key from being deleted during flush
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_OK(db_->Put(WriteOptions(), "imm_key", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(db_->Put(WriteOptions(), "mem_key", "val"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ReadOptions read_opts;
read_opts.ignore_range_deletions = true;
auto* iter = db_->NewIterator(read_opts);
ASSERT_OK(iter->status());
int i = 0;
std::string expected[] = {"imm_key", "mem_key", "sst_key"};
for (iter->SeekToFirst(); iter->Valid(); iter->Next(), ++i) {
std::string key;
ASSERT_EQ(expected[i], iter->key());
}
ASSERT_EQ(3, i);
delete iter;
db_->ReleaseSnapshot(snapshot);
}
#ifndef ROCKSDB_UBSAN_RUN
TEST_F(DBRangeDelTest, TailingIteratorRangeTombstoneUnsupported) {
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));
// snapshot prevents key from being deleted during flush
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
// iterations check unsupported in memtable, l0, and then l1
for (int i = 0; i < 3; ++i) {
ReadOptions read_opts;
read_opts.tailing = true;
auto* iter = db_->NewIterator(read_opts);
if (i == 2) {
// For L1+, iterators over files are created on-demand, so need seek
iter->SeekToFirst();
}
ASSERT_TRUE(iter->status().IsNotSupported());
delete iter;
if (i == 0) {
ASSERT_OK(db_->Flush(FlushOptions()));
} else if (i == 1) {
MoveFilesToLevel(1);
}
}
db_->ReleaseSnapshot(snapshot);
}
#endif // !ROCKSDB_UBSAN_RUN
TEST_F(DBRangeDelTest, SubcompactionHasEmptyDedicatedRangeDelFile) {
const int kNumFiles = 2, kNumKeysPerFile = 4;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.level0_file_num_compaction_trigger = kNumFiles;
options.max_subcompactions = 2;
options.num_levels = 2;
options.target_file_size_base = 4096;
Reopen(options);
// need a L1 file for subcompaction to be triggered
ASSERT_OK(
db_->Put(WriteOptions(), db_->DefaultColumnFamily(), Key(0), "val"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
// put enough keys to fill up the first subcompaction, and later range-delete
// them so that the first subcompaction outputs no key-values. In that case
// it'll consider making an SST file dedicated to range deletions.
for (int i = 0; i < kNumKeysPerFile; ++i) {
ASSERT_OK(db_->Put(WriteOptions(), db_->DefaultColumnFamily(), Key(i),
std::string(1024, 'a')));
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(kNumKeysPerFile)));
// the above range tombstone can be dropped, so that one alone won't cause a
// dedicated file to be opened. We can make one protected by snapshot that
// must be considered. Make its range outside the first subcompaction's range
// to exercise the tricky part of the code.
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(kNumKeysPerFile + 1),
Key(kNumKeysPerFile + 2)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(kNumFiles, NumTableFilesAtLevel(0));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_OK(db_->EnableAutoCompaction({db_->DefaultColumnFamily()}));
ASSERT_OK(dbfull()->TEST_WaitForCompact());
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, MemtableBloomFilter) {
// regression test for #2743. the range delete tombstones in memtable should
// be added even when Get() skips searching due to its prefix bloom filter
const int kMemtableSize = 1 << 20; // 1MB
const int kMemtablePrefixFilterSize = 1 << 13; // 8KB
const int kNumKeys = 1000;
const int kPrefixLen = 8;
Options options = CurrentOptions();
options.memtable_prefix_bloom_size_ratio =
static_cast<double>(kMemtablePrefixFilterSize) / kMemtableSize;
options.prefix_extractor.reset(
ROCKSDB_NAMESPACE::NewFixedPrefixTransform(kPrefixLen));
options.write_buffer_size = kMemtableSize;
Reopen(options);
for (int i = 0; i < kNumKeys; ++i) {
ASSERT_OK(Put(Key(i), "val"));
}
ASSERT_OK(Flush());
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(kNumKeys)));
for (int i = 0; i < kNumKeys; ++i) {
std::string value;
ASSERT_TRUE(db_->Get(ReadOptions(), Key(i), &value).IsNotFound());
}
}
TEST_F(DBRangeDelTest, CompactionTreatsSplitInputLevelDeletionAtomically) {
// This test originally verified that compaction treated files containing a
// split range deletion in the input level as an atomic unit. I.e.,
// compacting any input-level file(s) containing a portion of the range
// deletion causes all other input-level files containing portions of that
// same range deletion to be included in the compaction. Range deletion
// tombstones are now truncated to sstable boundaries which removed the need
// for that behavior (which could lead to excessively large
// compactions).
const int kNumFilesPerLevel = 4, kValueBytes = 4 << 10;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.level0_file_num_compaction_trigger = kNumFilesPerLevel;
options.memtable_factory.reset(
test::NewSpecialSkipListFactory(2 /* num_entries_flush */));
// max file size could be 2x of target file size, so set it to half of that
options.target_file_size_base = kValueBytes / 2;
// disable dynamic_file_size, as it will cut L1 files into more files (than
// kNumFilesPerLevel).
options.level_compaction_dynamic_file_size = false;
options.max_compaction_bytes = 1500;
// i == 0: CompactFiles
// i == 1: CompactRange
// i == 2: automatic compaction
for (int i = 0; i < 3; ++i) {
DestroyAndReopen(options);
ASSERT_OK(Put(Key(0), ""));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// snapshot protects range tombstone from dropping due to becoming obsolete.
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(0), Key(2 * kNumFilesPerLevel)));
Random rnd(301);
std::string value = rnd.RandomString(kValueBytes);
for (int j = 0; j < kNumFilesPerLevel; ++j) {
// give files overlapping key-ranges to prevent trivial move
ASSERT_OK(Put(Key(j), value));
ASSERT_OK(Put(Key(2 * kNumFilesPerLevel - 1 - j), value));
if (j > 0) {
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
ASSERT_EQ(j, NumTableFilesAtLevel(0));
}
}
// put extra key to trigger final flush
ASSERT_OK(Put("", ""));
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
ASSERT_OK(dbfull()->TEST_WaitForCompact());
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(kNumFilesPerLevel, NumTableFilesAtLevel(1));
ColumnFamilyMetaData meta;
db_->GetColumnFamilyMetaData(&meta);
if (i == 0) {
ASSERT_OK(db_->CompactFiles(
CompactionOptions(), {meta.levels[1].files[0].name}, 2 /* level */));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
} else if (i == 1) {
auto begin_str = Key(0), end_str = Key(1);
Slice begin = begin_str, end = end_str;
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), &begin, &end));
ASSERT_EQ(3, NumTableFilesAtLevel(1));
} else if (i == 2) {
ASSERT_OK(db_->SetOptions(db_->DefaultColumnFamily(),
{{"max_bytes_for_level_base", "10000"}}));
ASSERT_OK(dbfull()->TEST_WaitForCompact());
ASSERT_EQ(1, NumTableFilesAtLevel(1));
}
ASSERT_GT(NumTableFilesAtLevel(2), 0);
db_->ReleaseSnapshot(snapshot);
}
}
TEST_F(DBRangeDelTest, RangeTombstoneEndKeyAsSstableUpperBound) {
// Test the handling of the range-tombstone end-key as the
// upper-bound for an sstable.
const int kNumFilesPerLevel = 2, kValueBytes = 4 << 10;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.level0_file_num_compaction_trigger = kNumFilesPerLevel;
options.memtable_factory.reset(
test::NewSpecialSkipListFactory(2 /* num_entries_flush */));
options.target_file_size_base = kValueBytes;
options.disable_auto_compactions = true;
// disable it for now, otherwise the L1 files are going be cut before data 1:
// L1: [0] [1,4]
// L2: [0,0]
// because the grandparent file is between [0]->[1] and it's size is more than
// 1/8 of target size (4k).
options.level_compaction_dynamic_file_size = false;
DestroyAndReopen(options);
// Create an initial sstable at L2:
// [key000000#1,1, key000000#1,1]
ASSERT_OK(Put(Key(0), ""));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// A snapshot protects the range tombstone from dropping due to
// becoming obsolete.
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(2 * kNumFilesPerLevel)));
// Create 2 additional sstables in L0. Note that the first sstable
// contains the range tombstone.
// [key000000#3,1, key000004#72057594037927935,15]
// [key000001#5,1, key000002#6,1]
Random rnd(301);
std::string value = rnd.RandomString(kValueBytes);
for (int j = 0; j < kNumFilesPerLevel; ++j) {
// Give files overlapping key-ranges to prevent a trivial move when we
// compact from L0 to L1.
ASSERT_OK(Put(Key(j), value));
ASSERT_OK(Put(Key(2 * kNumFilesPerLevel - 1 - j), value));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(j + 1, NumTableFilesAtLevel(0));
}
// Compact the 2 L0 sstables to L1, resulting in the following LSM. There
// are 2 sstables generated in L1 due to the target_file_size_base setting.
// L1:
// [key000000#3,1, key000002#72057594037927935,15]
// [key000002#6,1, key000004#72057594037927935,15]
// L2:
// [key000000#1,1, key000000#1,1]
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
{
// Compact the second sstable in L1:
// L1:
// [key000000#3,1, key000002#72057594037927935,15]
// L2:
// [key000000#1,1, key000000#1,1]
// [key000002#6,1, key000004#72057594037927935,15]
//
// At the same time, verify the compaction does not cause the key at the
// endpoint (key000002#6,1) to disappear.
ASSERT_EQ(value, Get(Key(2)));
auto begin_str = Key(3);
const ROCKSDB_NAMESPACE::Slice begin = begin_str;
ASSERT_OK(dbfull()->TEST_CompactRange(1, &begin, nullptr));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_EQ(2, NumTableFilesAtLevel(2));
ASSERT_EQ(value, Get(Key(2)));
}
{
// Compact the first sstable in L1. This should be copacetic, but
// was previously resulting in overlapping sstables in L2 due to
// mishandling of the range tombstone end-key when used as the
// largest key for an sstable. The resulting LSM structure should
// be:
//
// L2:
// [key000000#1,1, key000001#72057594037927935,15]
// [key000001#5,1, key000002#72057594037927935,15]
// [key000002#6,1, key000004#72057594037927935,15]
auto begin_str = Key(0);
const ROCKSDB_NAMESPACE::Slice begin = begin_str;
ASSERT_OK(dbfull()->TEST_CompactRange(1, &begin, &begin));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
ASSERT_EQ(3, NumTableFilesAtLevel(2));
}
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, UnorderedTombstones) {
// Regression test for #2752. Range delete tombstones between
// different snapshot stripes are not stored in order, so the first
// tombstone of each snapshot stripe should be checked as a smallest
// candidate.
Options options = CurrentOptions();
DestroyAndReopen(options);
auto cf = db_->DefaultColumnFamily();
ASSERT_OK(db_->Put(WriteOptions(), cf, "a", "a"));
ASSERT_OK(db_->Flush(FlushOptions(), cf));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_OK(db_->DeleteRange(WriteOptions(), cf, "b", "c"));
// Hold a snapshot to separate these two delete ranges.
auto snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), cf, "a", "b"));
ASSERT_OK(db_->Flush(FlushOptions(), cf));
db_->ReleaseSnapshot(snapshot);
std::vector<std::vector<FileMetaData>> files;
dbfull()->TEST_GetFilesMetaData(cf, &files);
ASSERT_EQ(1, files[0].size());
ASSERT_EQ("a", files[0][0].smallest.user_key());
ASSERT_EQ("c", files[0][0].largest.user_key());
std::string v;
auto s = db_->Get(ReadOptions(), "a", &v);
ASSERT_TRUE(s.IsNotFound());
}
class MockMergeOperator : public MergeOperator {
// Mock non-associative operator. Non-associativity is expressed by lack of
// implementation for any `PartialMerge*` functions.
public:
bool FullMergeV2(const MergeOperationInput& merge_in,
MergeOperationOutput* merge_out) const override {
assert(merge_out != nullptr);
merge_out->new_value = merge_in.operand_list.back().ToString();
return true;
}
const char* Name() const override { return "MockMergeOperator"; }
};
TEST_F(DBRangeDelTest, KeyAtOverlappingEndpointReappears) {
// This test uses a non-associative merge operator since that is a convenient
// way to get compaction to write out files with overlapping user-keys at the
// endpoints. Note, however, overlapping endpoints can also occur with other
// value types (Put, etc.), assuming the right snapshots are present.
const int kFileBytes = 1 << 20;
const int kValueBytes = 1 << 10;
const int kNumFiles = 4;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.merge_operator.reset(new MockMergeOperator());
options.target_file_size_base = kFileBytes;
Reopen(options);
// Push dummy data to L3 so that our actual test files on L0-L2
// will not be considered "bottommost" level, otherwise compaction
// may prevent us from creating overlapping user keys
// as on the bottommost layer MergeHelper
ASSERT_OK(db_->Merge(WriteOptions(), "key", "dummy"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(3);
Random rnd(301);
const Snapshot* snapshot = nullptr;
for (int i = 0; i < kNumFiles; ++i) {
for (int j = 0; j < kFileBytes / kValueBytes; ++j) {
auto value = rnd.RandomString(kValueBytes);
ASSERT_OK(db_->Merge(WriteOptions(), "key", value));
}
if (i == kNumFiles - 1) {
// Take snapshot to prevent covered merge operands from being dropped by
// compaction.
snapshot = db_->GetSnapshot();
// The DeleteRange is the last write so all merge operands are covered.
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"key", "key_"));
}
ASSERT_OK(db_->Flush(FlushOptions()));
}
ASSERT_EQ(kNumFiles, NumTableFilesAtLevel(0));
std::string value;
ASSERT_TRUE(db_->Get(ReadOptions(), "key", &value).IsNotFound());
ASSERT_OK(dbfull()->TEST_CompactRange(
0 /* level */, nullptr /* begin */, nullptr /* end */,
nullptr /* column_family */, true /* disallow_trivial_move */));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
// Now we have multiple files at L1 all containing a single user key, thus
// guaranteeing overlap in the file endpoints.
ASSERT_GT(NumTableFilesAtLevel(1), 1);
// Verify no merge operands reappeared after the compaction.
ASSERT_TRUE(db_->Get(ReadOptions(), "key", &value).IsNotFound());
// Compact and verify again. It's worthwhile because now the files have
// tighter endpoints, so we can verify that doesn't mess anything up.
ASSERT_OK(dbfull()->TEST_CompactRange(
1 /* level */, nullptr /* begin */, nullptr /* end */,
nullptr /* column_family */, true /* disallow_trivial_move */));
ASSERT_GT(NumTableFilesAtLevel(2), 1);
ASSERT_TRUE(db_->Get(ReadOptions(), "key", &value).IsNotFound());
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, UntruncatedTombstoneDoesNotDeleteNewerKey) {
// Verify a key newer than a range tombstone cannot be deleted by being
// compacted to the bottom level (and thus having its seqnum zeroed) before
// the range tombstone. This used to happen when range tombstones were
// untruncated on reads such that they extended past their file boundaries.
//
// Test summary:
//
// - L1 is bottommost.
// - A couple snapshots are strategically taken to prevent seqnums from being
// zeroed, range tombstone from being dropped, merge operands from being
// dropped, and merge operands from being combined.
// - Left half of files in L1 all have same user key, ensuring their file
// boundaries overlap. In the past this would cause range tombstones to be
// untruncated.
// - Right half of L1 files all have different keys, ensuring no overlap.
// - A range tombstone spans all L1 keys, so it is stored in every L1 file.
// - Keys in the right side of the key-range are overwritten. These are
// compacted down to L1 after releasing snapshots such that their seqnums
// will be zeroed.
// - A full range scan is performed. If the tombstone in the left L1 files
// were untruncated, it would now cover keys newer than it (but with zeroed
// seqnums) in the right L1 files.
const int kFileBytes = 1 << 20;
const int kValueBytes = 1 << 10;
const int kNumFiles = 4;
const int kMaxKey = kNumFiles * kFileBytes / kValueBytes;
const int kKeysOverwritten = 10;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.merge_operator.reset(new MockMergeOperator());
options.num_levels = 2;
options.target_file_size_base = kFileBytes;
Reopen(options);
Random rnd(301);
// - snapshots[0] prevents merge operands from being combined during
// compaction.
// - snapshots[1] prevents merge operands from being dropped due to the
// covering range tombstone.
const Snapshot* snapshots[] = {nullptr, nullptr};
for (int i = 0; i < kNumFiles; ++i) {
for (int j = 0; j < kFileBytes / kValueBytes; ++j) {
auto value = rnd.RandomString(kValueBytes);
std::string key;
if (i < kNumFiles / 2) {
key = Key(0);
} else {
key = Key(1 + i * kFileBytes / kValueBytes + j);
}
ASSERT_OK(db_->Merge(WriteOptions(), key, value));
}
if (i == 0) {
snapshots[0] = db_->GetSnapshot();
}
if (i == kNumFiles - 1) {
snapshots[1] = db_->GetSnapshot();
// The DeleteRange is the last write so all merge operands are covered.
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(0), Key(kMaxKey + 1)));
}
ASSERT_OK(db_->Flush(FlushOptions()));
}
ASSERT_EQ(kNumFiles, NumTableFilesAtLevel(0));
auto get_key_count = [this]() -> int {
auto* iter = db_->NewIterator(ReadOptions());
assert(iter->status().ok());
iter->SeekToFirst();
int keys_found = 0;
for (; iter->Valid(); iter->Next()) {
++keys_found;
}
delete iter;
return keys_found;
};
// All keys should be covered
ASSERT_EQ(0, get_key_count());
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr /* begin_key */,
nullptr /* end_key */));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
// Roughly the left half of L1 files should have overlapping boundary keys,
// while the right half should not.
ASSERT_GE(NumTableFilesAtLevel(1), kNumFiles);
// Now overwrite a few keys that are in L1 files that definitely don't have
// overlapping boundary keys.
for (int i = kMaxKey; i > kMaxKey - kKeysOverwritten; --i) {
auto value = rnd.RandomString(kValueBytes);
ASSERT_OK(db_->Merge(WriteOptions(), Key(i), value));
}
ASSERT_OK(db_->Flush(FlushOptions()));
// The overwritten keys are in L0 now, so clearly aren't covered by the range
// tombstone in L1.
ASSERT_EQ(kKeysOverwritten, get_key_count());
// Release snapshots so seqnums can be zeroed when L0->L1 happens.
db_->ReleaseSnapshot(snapshots[0]);
db_->ReleaseSnapshot(snapshots[1]);
auto begin_key_storage = Key(kMaxKey - kKeysOverwritten + 1);
auto end_key_storage = Key(kMaxKey);
Slice begin_key(begin_key_storage);
Slice end_key(end_key_storage);
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), &begin_key, &end_key));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_GE(NumTableFilesAtLevel(1), kNumFiles);
ASSERT_EQ(kKeysOverwritten, get_key_count());
}
TEST_F(DBRangeDelTest, DeletedMergeOperandReappearsIterPrev) {
// Exposes a bug where we were using
// `RangeDelPositioningMode::kBackwardTraversal` while scanning merge operands
// in the forward direction. Confusingly, this case happened during
// `DBIter::Prev`. It could cause assertion failure, or reappearing keys.
const int kFileBytes = 1 << 20;
const int kValueBytes = 1 << 10;
// Need multiple keys so we can get results when calling `Prev()` after
// `SeekToLast()`.
const int kNumKeys = 3;
const int kNumFiles = 4;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.merge_operator.reset(new MockMergeOperator());
options.target_file_size_base = kFileBytes;
Reopen(options);
Random rnd(301);
const Snapshot* snapshot = nullptr;
for (int i = 0; i < kNumFiles; ++i) {
for (int j = 0; j < kFileBytes / kValueBytes; ++j) {
auto value = rnd.RandomString(kValueBytes);
ASSERT_OK(db_->Merge(WriteOptions(), Key(j % kNumKeys), value));
if (i == 0 && j == kNumKeys) {
// Take snapshot to prevent covered merge operands from being dropped or
// merged by compaction.
snapshot = db_->GetSnapshot();
// Do a DeleteRange near the beginning so only the oldest merge operand
// for each key is covered. This ensures the sequence of events:
//
// - `DBIter::Prev()` is called
// - After several same versions of the same user key are encountered,
// it decides to seek using `DBIter::FindValueForCurrentKeyUsingSeek`.
// - Binary searches to the newest version of the key, which is in the
// leftmost file containing the user key.
// - Scans forwards to collect all merge operands. Eventually reaches
// the rightmost file containing the oldest merge operand, which
// should be covered by the `DeleteRange`. If `RangeDelAggregator`
// were not properly using `kForwardTraversal` here, that operand
// would reappear.
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(0), Key(kNumKeys + 1)));
}
}
ASSERT_OK(db_->Flush(FlushOptions()));
}
ASSERT_EQ(kNumFiles, NumTableFilesAtLevel(0));
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr /* begin_key */,
nullptr /* end_key */));
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_GT(NumTableFilesAtLevel(1), 1);
auto* iter = db_->NewIterator(ReadOptions());
ASSERT_OK(iter->status());
iter->SeekToLast();
int keys_found = 0;
for (; iter->Valid(); iter->Prev()) {
++keys_found;
}
delete iter;
ASSERT_EQ(kNumKeys, keys_found);
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, SnapshotPreventsDroppedKeys) {
const int kFileBytes = 1 << 20;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = kFileBytes;
Reopen(options);
ASSERT_OK(Put(Key(0), "a"));
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(10)));
ASSERT_OK(db_->Flush(FlushOptions()));
ReadOptions read_opts;
read_opts.snapshot = snapshot;
auto* iter = db_->NewIterator(read_opts);
ASSERT_OK(iter->status());
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(Key(0), iter->key());
iter->Next();
ASSERT_FALSE(iter->Valid());
delete iter;
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, SnapshotPreventsDroppedKeysInImmMemTables) {
const int kFileBytes = 1 << 20;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = kFileBytes;
Reopen(options);
// block flush thread -> pin immtables in memory
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->LoadDependency({
{"SnapshotPreventsDroppedKeysInImmMemTables:AfterNewIterator",
"DBImpl::BGWorkFlush"},
});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put(Key(0), "a"));
std::unique_ptr<const Snapshot, std::function<void(const Snapshot*)>>
snapshot(db_->GetSnapshot(),
[this](const Snapshot* s) { db_->ReleaseSnapshot(s); });
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(10)));
ASSERT_OK(dbfull()->TEST_SwitchMemtable());
ReadOptions read_opts;
read_opts.snapshot = snapshot.get();
std::unique_ptr<Iterator> iter(db_->NewIterator(read_opts));
ASSERT_OK(iter->status());
TEST_SYNC_POINT("SnapshotPreventsDroppedKeysInImmMemTables:AfterNewIterator");
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(Key(0), iter->key());
iter->Next();
ASSERT_FALSE(iter->Valid());
}
TEST_F(DBRangeDelTest, RangeTombstoneWrittenToMinimalSsts) {
// Adapted from
// https://github.com/cockroachdb/cockroach/blob/de8b3ea603dd1592d9dc26443c2cc92c356fbc2f/pkg/storage/engine/rocksdb_test.go#L1267-L1398.
// Regression test for issue where range tombstone was written to more files
// than necessary when it began exactly at the begin key in the next
// compaction output file.
const int kFileBytes = 1 << 20;
const int kValueBytes = 4 << 10;
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
// Have a bit of slack in the size limits but we enforce them more strictly
// when manually flushing/compacting.
options.max_compaction_bytes = 2 * kFileBytes;
options.target_file_size_base = 2 * kFileBytes;
options.write_buffer_size = 2 * kFileBytes;
Reopen(options);
Random rnd(301);
for (char first_char : {'a', 'b', 'c'}) {
for (int i = 0; i < kFileBytes / kValueBytes; ++i) {
std::string key(1, first_char);
key.append(Key(i));
std::string value = rnd.RandomString(kValueBytes);
ASSERT_OK(Put(key, value));
}
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
}
ASSERT_EQ(0, NumTableFilesAtLevel(0));
ASSERT_EQ(3, NumTableFilesAtLevel(2));
// Populate the memtable lightly while spanning the whole key-space. The
// setting of `max_compaction_bytes` will cause the L0->L1 to output multiple
// files to prevent a large L1->L2 compaction later.
ASSERT_OK(Put("a", "val"));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"c" + Key(1), "d"));
// Our compaction output file cutting logic currently only considers point
// keys. So, in order for the range tombstone to have a chance at landing at
// the start of a new file, we need a point key at the range tombstone's
// start.
// TODO(ajkr): remove this `Put` after file cutting accounts for range
// tombstones (#3977).
ASSERT_OK(Put("c" + Key(1), "value"));
ASSERT_OK(db_->Flush(FlushOptions()));
// Ensure manual L0->L1 compaction cuts the outputs before the range tombstone
// and the range tombstone is only placed in the second SST.
std::string begin_key_storage("c" + Key(1));
Slice begin_key(begin_key_storage);
std::string end_key_storage("d");
Slice end_key(end_key_storage);
ASSERT_OK(dbfull()->TEST_CompactRange(
0 /* level */, &begin_key /* begin */, &end_key /* end */,
nullptr /* column_family */, true /* disallow_trivial_move */));
ASSERT_EQ(2, NumTableFilesAtLevel(1));
std::vector<LiveFileMetaData> all_metadata;
std::vector<LiveFileMetaData> l1_metadata;
db_->GetLiveFilesMetaData(&all_metadata);
for (const auto& metadata : all_metadata) {
if (metadata.level == 1) {
l1_metadata.push_back(metadata);
}
}
std::sort(l1_metadata.begin(), l1_metadata.end(),
[&](const LiveFileMetaData& a, const LiveFileMetaData& b) {
return options.comparator->Compare(a.smallestkey, b.smallestkey) <
0;
});
ASSERT_EQ("a", l1_metadata[0].smallestkey);
ASSERT_EQ("a", l1_metadata[0].largestkey);
ASSERT_EQ("c" + Key(1), l1_metadata[1].smallestkey);
ASSERT_EQ("d", l1_metadata[1].largestkey);
TablePropertiesCollection all_table_props;
ASSERT_OK(db_->GetPropertiesOfAllTables(&all_table_props));
int64_t num_range_deletions = 0;
for (const auto& name_and_table_props : all_table_props) {
const auto& name = name_and_table_props.first;
const auto& table_props = name_and_table_props.second;
// The range tombstone should only be output to the second L1 SST.
if (name.size() >= l1_metadata[1].name.size() &&
name.substr(name.size() - l1_metadata[1].name.size())
.compare(l1_metadata[1].name) == 0) {
ASSERT_EQ(1, table_props->num_range_deletions);
++num_range_deletions;
} else {
ASSERT_EQ(0, table_props->num_range_deletions);
}
}
ASSERT_EQ(1, num_range_deletions);
}
TEST_F(DBRangeDelTest, LevelCompactOutputCutAtRangeTombstoneForTtlFiles) {
Options options = CurrentOptions();
options.compression = kNoCompression;
options.compaction_pri = kMinOverlappingRatio;
options.disable_auto_compactions = true;
options.ttl = 24 * 60 * 60; // 24 hours
options.target_file_size_base = 8 << 10;
env_->SetMockSleep();
options.env = env_;
DestroyAndReopen(options);
Random rnd(301);
// Fill some data so that future compactions are not bottommost level
// compaction, and hence they would try cut around files for ttl
for (int i = 5; i < 10; ++i) {
ASSERT_OK(Put(Key(i), rnd.RandomString(1 << 10)));
}
ASSERT_OK(Flush());
MoveFilesToLevel(3);
ASSERT_EQ("0,0,0,1", FilesPerLevel());
for (int i = 5; i < 10; ++i) {
ASSERT_OK(Put(Key(i), rnd.RandomString(1 << 10)));
}
ASSERT_OK(Flush());
MoveFilesToLevel(1);
ASSERT_EQ("0,1,0,1", FilesPerLevel());
env_->MockSleepForSeconds(20 * 60 * 60);
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
Key(11), Key(12)));
ASSERT_OK(Put(Key(0), rnd.RandomString(1 << 10)));
ASSERT_OK(Flush());
ASSERT_EQ("1,1,0,1", FilesPerLevel());
// L0 file is new, L1 and L3 file are old and qualified for TTL
env_->MockSleepForSeconds(10 * 60 * 60);
MoveFilesToLevel(1);
// L1 output should be cut into 3 files:
// File 0: Key(0)
// File 1: (qualified for TTL): Key(5) - Key(10)
// File 1: DeleteRange [11, 12)
ASSERT_EQ("0,3,0,1", FilesPerLevel());
}
// Test SST partitioner cut after every single key
class SingleKeySstPartitioner : public SstPartitioner {
public:
const char* Name() const override { return "SingleKeySstPartitioner"; }
PartitionerResult ShouldPartition(
const PartitionerRequest& /*request*/) override {
return kRequired;
}
bool CanDoTrivialMove(const Slice& /*smallest_user_key*/,
const Slice& /*largest_user_key*/) override {
return false;
}
};
class SingleKeySstPartitionerFactory : public SstPartitionerFactory {
public:
static const char* kClassName() { return "SingleKeySstPartitionerFactory"; }
const char* Name() const override { return kClassName(); }
std::unique_ptr<SstPartitioner> CreatePartitioner(
const SstPartitioner::Context& /* context */) const override {
return std::unique_ptr<SstPartitioner>(new SingleKeySstPartitioner());
}
};
TEST_F(DBRangeDelTest, CompactionEmitRangeTombstoneToSSTPartitioner) {
Options options = CurrentOptions();
auto factory = std::make_shared<SingleKeySstPartitionerFactory>();
options.sst_partitioner_factory = factory;
options.disable_auto_compactions = true;
DestroyAndReopen(options);
Random rnd(301);
// range deletion keys are not processed when compacting to bottommost level,
// so creating a file at older level to make the next compaction not
// bottommost level
ASSERT_OK(db_->Put(WriteOptions(), Key(4), rnd.RandomString(10)));
ASSERT_OK(Flush());
MoveFilesToLevel(5);
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(10)));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(5)));
ASSERT_OK(Flush());
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(1);
// SSTPartitioner decides to cut when range tombstone start key is passed to
// it. Note that the range tombstone [2, 5) itself span multiple keys, but we
// are not able to partition within its range yet.
ASSERT_EQ(2, NumTableFilesAtLevel(1));
}
TEST_F(DBRangeDelTest, OversizeCompactionGapBetweenPointKeyAndTombstone) {
// L2 has 2 files
// L2_0: 0, 1, 2, 3, 4
// L2_1: 5, 6, 7
// L0 has 1 file
// L0: 0, [5, 6), 8
// max_compaction_bytes is less than the size of L2_0 and L2_1.
// When compacting L0 into L1, it should split into 3 files:
// compaction output should cut before key 5 and key 8 to
// limit future compaction size.
const int kNumPerFile = 4, kNumFiles = 2;
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.target_file_size_base = 9 * 1024;
options.max_compaction_bytes = 9 * 1024;
DestroyAndReopen(options);
Random rnd(301);
for (int i = 0; i < kNumFiles; ++i) {
std::vector<std::string> values;
for (int j = 0; j < kNumPerFile; j++) {
values.push_back(rnd.RandomString(3 << 10));
ASSERT_OK(Put(Key(i * kNumPerFile + j), values[j]));
}
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(2);
ASSERT_EQ(2, NumTableFilesAtLevel(2));
ASSERT_OK(Put(Key(0), rnd.RandomString(1 << 10)));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(5),
Key(6)));
ASSERT_OK(Put(Key(8), rnd.RandomString(1 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(3, NumTableFilesAtLevel(1));
}
TEST_F(DBRangeDelTest, OversizeCompactionGapBetweenTombstone) {
// L2 has two files
// L2_0: 0, 1, 2, 3, 4. L2_1: 5, 6, 7
// L0 has two range tombstones [0, 1), [7, 8).
// max_compaction_bytes is less than the size of L2_0.
// When compacting L0 into L1, the two range tombstones should be
// split into two files.
const int kNumPerFile = 4, kNumFiles = 2;
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.target_file_size_base = 9 * 1024;
options.max_compaction_bytes = 9 * 1024;
DestroyAndReopen(options);
Random rnd(301);
for (int i = 0; i < kNumFiles; ++i) {
std::vector<std::string> values;
// Write 12K (4 values, each 3K)
for (int j = 0; j < kNumPerFile; j++) {
values.push_back(rnd.RandomString(3 << 10));
ASSERT_OK(Put(Key(i * kNumPerFile + j), values[j]));
}
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(2);
ASSERT_EQ(2, NumTableFilesAtLevel(2));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(1)));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(7),
Key(8)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
// This is L0 -> L1 compaction
// The two range tombstones are broken up into two output files
// to limit compaction size.
ASSERT_EQ(2, NumTableFilesAtLevel(1));
}
TEST_F(DBRangeDelTest, OversizeCompactionPointKeyWithinRangetombstone) {
// L2 has two files
// L2_0: 0, 1, 2, 3, 4. L2_1: 6, 7, 8
// L0 has [0, 9) and point key 5
// max_compaction_bytes is less than the size of L2_0.
// When compacting L0 into L1, the compaction should cut at point key 5.
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.target_file_size_base = 9 * 1024;
options.max_compaction_bytes = 9 * 1024;
DestroyAndReopen(options);
Random rnd(301);
for (int i = 0; i < 9; ++i) {
if (i == 5) {
++i;
}
ASSERT_OK(Put(Key(i), rnd.RandomString(3 << 10)));
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(2);
ASSERT_EQ(2, NumTableFilesAtLevel(2));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(9)));
ASSERT_OK(Put(Key(5), rnd.RandomString(1 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(2, NumTableFilesAtLevel(1));
}
TEST_F(DBRangeDelTest, OverlappedTombstones) {
const int kNumPerFile = 4, kNumFiles = 2;
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.target_file_size_base = 9 * 1024;
options.max_compaction_bytes = 9 * 1024;
DestroyAndReopen(options);
Random rnd(301);
for (int i = 0; i < kNumFiles; ++i) {
std::vector<std::string> values;
// Write 12K (4 values, each 3K)
for (int j = 0; j < kNumPerFile; j++) {
values.push_back(rnd.RandomString(3 << 10));
ASSERT_OK(Put(Key(i * kNumPerFile + j), values[j]));
}
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(2);
ASSERT_EQ(2, NumTableFilesAtLevel(2));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(1),
Key((kNumFiles)*kNumPerFile + 1)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
// The tombstone range is not broken up into multiple SSTs which may incur a
// large compaction with L2.
ASSERT_EQ(1, NumTableFilesAtLevel(1));
std::vector<std::vector<FileMetaData>> files;
ASSERT_OK(dbfull()->TEST_CompactRange(1, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(1, NumTableFilesAtLevel(2));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
}
TEST_F(DBRangeDelTest, OverlappedKeys) {
const int kNumPerFile = 4, kNumFiles = 2;
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.target_file_size_base = 9 * 1024;
options.max_compaction_bytes = 9 * 1024;
DestroyAndReopen(options);
Random rnd(301);
for (int i = 0; i < kNumFiles; ++i) {
std::vector<std::string> values;
// Write 12K (4 values, each 3K)
for (int j = 0; j < kNumPerFile; j++) {
values.push_back(rnd.RandomString(3 << 10));
ASSERT_OK(Put(Key(i * kNumPerFile + j), values[j]));
}
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(2);
ASSERT_EQ(2, NumTableFilesAtLevel(2));
for (int i = 1; i < kNumFiles * kNumPerFile + 1; i++) {
ASSERT_OK(Put(Key(i), "0x123"));
}
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
// The key range is broken up into three SSTs to avoid a future big compaction
// with the grandparent
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(3, NumTableFilesAtLevel(1));
ASSERT_OK(dbfull()->TEST_CompactRange(1, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
// L1->L2 compaction size is limited to max_compaction_bytes
ASSERT_EQ(3, NumTableFilesAtLevel(2));
ASSERT_EQ(0, NumTableFilesAtLevel(1));
}
TEST_F(DBRangeDelTest, IteratorRefresh) {
// Refreshing an iterator after a range tombstone is added should cause the
// deleted range of keys to disappear.
for (bool sv_changed : {false, true}) {
ASSERT_OK(db_->Put(WriteOptions(), "key1", "value1"));
ASSERT_OK(db_->Put(WriteOptions(), "key2", "value2"));
auto* iter = db_->NewIterator(ReadOptions());
ASSERT_OK(iter->status());
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"key2", "key3"));
if (sv_changed) {
ASSERT_OK(db_->Flush(FlushOptions()));
}
ASSERT_OK(iter->Refresh());
ASSERT_OK(iter->status());
iter->SeekToFirst();
ASSERT_EQ("key1", iter->key());
iter->Next();
ASSERT_FALSE(iter->Valid());
delete iter;
}
}
void VerifyIteratorReachesEnd(InternalIterator* iter) {
ASSERT_TRUE(!iter->Valid() && iter->status().ok());
}
void VerifyIteratorReachesEnd(Iterator* iter) {
ASSERT_TRUE(!iter->Valid() && iter->status().ok());
}
TEST_F(DBRangeDelTest, IteratorReseek) {
// Range tombstone triggers reseek (seeking to a range tombstone end key) in
// merging iterator. Test set up:
// one memtable: range tombstone [0, 1)
// one immutable memtable: range tombstone [1, 2)
// one L0 file with range tombstone [2, 3)
// one L1 file with range tombstone [3, 4)
// Seek(0) should trigger cascading reseeks at all levels below memtable.
// Seek(1) should trigger cascading reseeks at all levels below immutable
// memtable. SeekToFirst and SeekToLast trigger no reseek.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
DestroyAndReopen(options);
// L1
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(3),
Key(4)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L0
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(3)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
// Immutable memtable
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(1),
Key(2)));
ASSERT_OK(static_cast_with_check<DBImpl>(db_)->TEST_SwitchMemtable());
std::string value;
ASSERT_TRUE(dbfull()->GetProperty(db_->DefaultColumnFamily(),
"rocksdb.num-immutable-mem-table", &value));
ASSERT_EQ(1, std::stoi(value));
// live memtable
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(1)));
// this memtable is still active
ASSERT_TRUE(dbfull()->GetProperty(db_->DefaultColumnFamily(),
"rocksdb.num-immutable-mem-table", &value));
ASSERT_EQ(1, std::stoi(value));
auto iter = db_->NewIterator(ReadOptions());
get_perf_context()->Reset();
iter->Seek(Key(0));
// Reseeked immutable memtable, L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 3);
VerifyIteratorReachesEnd(iter);
get_perf_context()->Reset();
iter->SeekForPrev(Key(1));
// Reseeked L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
VerifyIteratorReachesEnd(iter);
get_perf_context()->Reset();
iter->SeekToFirst();
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 0);
VerifyIteratorReachesEnd(iter);
iter->SeekToLast();
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 0);
VerifyIteratorReachesEnd(iter);
delete iter;
}
TEST_F(DBRangeDelTest, ReseekDuringNextAndPrev) {
// Range tombstone triggers reseek during Next()/Prev() in merging iterator.
// Test set up:
// memtable has: [0, 1) [2, 3)
// L0 has: 2
// L1 has: 1, 2, 3
// Seek(0) will reseek to 1 for L0 and L1. Seek(1) will not trigger any
// reseek. Then Next() determines 2 is covered by [2, 3), it will try to
// reseek to 3 for L0 and L1. Similar story for Prev() and SeekForPrev() is
// tested.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
DestroyAndReopen(options);
// L1
ASSERT_OK(db_->Put(WriteOptions(), Key(1), "foo"));
ASSERT_OK(db_->Put(WriteOptions(), Key(2), "foo"));
ASSERT_OK(db_->Put(WriteOptions(), Key(3), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L0
ASSERT_OK(db_->Put(WriteOptions(), Key(2), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
// Memtable
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(1)));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(3)));
auto iter = db_->NewIterator(ReadOptions());
auto iter_test_forward = [&] {
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(1));
get_perf_context()->Reset();
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(3));
// Reseeked L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
// Next to Prev
get_perf_context()->Reset();
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(1));
// Reseeked L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
// Prev to Next
get_perf_context()->Reset();
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(3));
// Reseeked L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
iter->Next();
VerifyIteratorReachesEnd(iter);
};
get_perf_context()->Reset();
iter->Seek(Key(0));
// Reseeked L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
iter_test_forward();
get_perf_context()->Reset();
iter->Seek(Key(1));
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 0);
iter_test_forward();
get_perf_context()->Reset();
iter->SeekForPrev(Key(2));
// Reseeked L0 and L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
iter_test_forward();
get_perf_context()->Reset();
iter->SeekForPrev(Key(1));
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 0);
iter_test_forward();
get_perf_context()->Reset();
iter->SeekToFirst();
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 0);
iter_test_forward();
iter->SeekToLast();
iter->Prev();
iter_test_forward();
delete iter;
}
TEST_F(DBRangeDelTest, TombstoneFromCurrentLevel) {
// Range tombstone triggers reseek when covering key from the same level.
// in merging iterator. Test set up:
// memtable has: [0, 1)
// L0 has: [2, 3), 2
// L1 has: 1, 2, 3
// Seek(0) will reseek to 1 for L0 and L1.
// Then Next() will reseek to 3 for L1 since 2 in L0 is covered by [2, 3) in
// L0.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
DestroyAndReopen(options);
// L1
ASSERT_OK(db_->Put(WriteOptions(), Key(1), "foo"));
ASSERT_OK(db_->Put(WriteOptions(), Key(2), "foo"));
ASSERT_OK(db_->Put(WriteOptions(), Key(3), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L0
ASSERT_OK(db_->Put(WriteOptions(), Key(2), "foo"));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(3)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
// Memtable
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(0),
Key(1)));
auto iter = db_->NewIterator(ReadOptions());
get_perf_context()->Reset();
iter->Seek(Key(0));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(1));
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 2);
get_perf_context()->Reset();
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(3));
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 1);
delete iter;
}
class TombstoneTestSstPartitioner : public SstPartitioner {
public:
const char* Name() const override { return "SingleKeySstPartitioner"; }
PartitionerResult ShouldPartition(
const PartitionerRequest& request) override {
if (cmp->Compare(*request.current_user_key, DBTestBase::Key(5)) == 0) {
return kRequired;
} else {
return kNotRequired;
}
}
bool CanDoTrivialMove(const Slice& /*smallest_user_key*/,
const Slice& /*largest_user_key*/) override {
return false;
}
const Comparator* cmp = BytewiseComparator();
};
class TombstoneTestSstPartitionerFactory : public SstPartitionerFactory {
public:
static const char* kClassName() {
return "TombstoneTestSstPartitionerFactory";
}
const char* Name() const override { return kClassName(); }
std::unique_ptr<SstPartitioner> CreatePartitioner(
const SstPartitioner::Context& /* context */) const override {
return std::unique_ptr<SstPartitioner>(new TombstoneTestSstPartitioner());
}
};
TEST_F(DBRangeDelTest, TombstoneAcrossFileBoundary) {
// Verify that a range tombstone across file boundary covers keys from older
// levels. Test set up:
// L1_0: 1, 3, [2, 6) L1_1: 5, 7, [2, 6) ([2, 6) is from compaction with
// L1_0) L2 has: 5
// Seek(1) and then Next() should move the L1 level iterator to
// L1_1. Check if 5 is returned after Next().
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 2 * 1024;
options.max_compaction_bytes = 2 * 1024;
// Make sure L1 files are split before "5"
auto factory = std::make_shared<TombstoneTestSstPartitionerFactory>();
options.sst_partitioner_factory = factory;
DestroyAndReopen(options);
Random rnd(301);
// L2
// the file should be smaller than max_compaction_bytes, otherwise the file
// will be cut before 7.
ASSERT_OK(db_->Put(WriteOptions(), Key(5), rnd.RandomString(1 << 9)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_1
ASSERT_OK(db_->Put(WriteOptions(), Key(5), rnd.RandomString(1 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(7), rnd.RandomString(1 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
// L1_0
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(1 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(3), rnd.RandomString(1 << 10)));
// Prevent keys being compacted away
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(6)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(2, NumTableFilesAtLevel(0));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
get_perf_context()->Reset();
iter->Seek(Key(1));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(1));
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(7));
// 1 reseek into L2 when key 5 in L2 is covered by [2, 6) from L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 1);
delete iter;
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, NonOverlappingTombstonAtBoundary) {
// Verify that a range tombstone across file boundary covers keys from older
// levels.
// Test set up:
// L1_0: 1, 3, [4, 7) L1_1: 6, 8, [4, 7)
// L2: 5
// Note that [4, 7) is at end of L1_0 and not overlapping with any point key
// in L1_0. [4, 7) from L1_0 should cover 5 is sentinel works
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 2 * 1024;
options.level_compaction_dynamic_file_size = false;
DestroyAndReopen(options);
Random rnd(301);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(5), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_1
ASSERT_OK(db_->Put(WriteOptions(), Key(6), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(8), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
// L1_0
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(3), rnd.RandomString(4 << 10)));
// Prevent keys being compacted away
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(4),
Key(7)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(2, NumTableFilesAtLevel(0));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek(Key(3));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(3));
get_perf_context()->Reset();
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(8));
// 1 reseek into L1 since 5 from L2 is covered by [4, 7) from L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 1);
for (auto& k : {4, 5, 6}) {
get_perf_context()->Reset();
iter->Seek(Key(k));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(8));
// 1 reseek into L1
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count, 1);
}
delete iter;
}
TEST_F(DBRangeDelTest, OlderLevelHasNewerData) {
// L1_0: 1, 3, [2, 7) L1_1: 5, 6 at a newer sequence number than [2, 7)
// Compact L1_1 to L2. Seek(3) should not skip 5 or 6.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
Random rnd(301);
// L1_0
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(3), rnd.RandomString(4 << 10)));
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(7)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L1_1
ASSERT_OK(db_->Put(WriteOptions(), Key(5), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(6), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
ASSERT_EQ(1, NumTableFilesAtLevel(0));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
auto key = Key(6);
Slice begin(key);
EXPECT_OK(dbfull()->TEST_CompactRange(1, &begin, nullptr));
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_EQ(1, NumTableFilesAtLevel(2));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek(Key(3));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(5));
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), Key(6));
delete iter;
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, LevelBoundaryDefinedByTombstone) {
// L1 has: 1, 2, [4, 5)
// L2 has: 4
// Seek(3), which is over all points keys in L1, check whether
// sentinel key from L1 works in this case.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
Random rnd(301);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(4), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
const Snapshot* snapshot = db_->GetSnapshot();
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_0
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(2), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(4),
Key(5)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_EQ(1, NumTableFilesAtLevel(2));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek(Key(3));
ASSERT_TRUE(!iter->Valid());
ASSERT_OK(iter->status());
get_perf_context()->Reset();
iter->SeekForPrev(Key(5));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(2));
db_->ReleaseSnapshot(snapshot);
delete iter;
}
TEST_F(DBRangeDelTest, TombstoneOnlyFile) {
// L1_0: 1, 2, L1_1: [3, 5)
// L2: 3
// Seek(2) then Next() should advance L1 iterator into L1_1.
// If sentinel works with tombstone only file, it should cover the key in L2.
// Similar story for SeekForPrev(4).
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
Random rnd(301);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(3), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_0
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(2), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_1
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(3),
Key(5)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
ASSERT_EQ(1, NumTableFilesAtLevel(2));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek(Key(2));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(2));
iter->Next();
VerifyIteratorReachesEnd(iter);
iter->SeekForPrev(Key(4));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(2));
iter->Next();
VerifyIteratorReachesEnd(iter);
delete iter;
}
void VerifyIteratorKey(InternalIterator* iter,
const std::vector<std::string>& expected_keys,
bool forward = true) {
for (auto& key : expected_keys) {
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->user_key(), key);
if (forward) {
iter->Next();
} else {
iter->Prev();
}
}
}
TEST_F(DBRangeDelTest, TombstoneOnlyLevel) {
// L1 [3, 5)
// L2 has: 3, 4
// Any kind of iterator seek should skip 3 and 4 in L2.
// L1 level iterator should produce sentinel key.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(3), "foo"));
ASSERT_OK(db_->Put(WriteOptions(), Key(4), "bar"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(3),
Key(5)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
get_perf_context()->Reset();
uint64_t expected_reseek = 0;
for (auto i = 0; i < 7; ++i) {
iter->Seek(Key(i));
VerifyIteratorReachesEnd(iter);
if (i < 5) {
++expected_reseek;
}
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count,
expected_reseek);
iter->SeekForPrev(Key(i));
VerifyIteratorReachesEnd(iter);
if (i > 2) {
++expected_reseek;
}
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count,
expected_reseek);
iter->SeekToFirst();
VerifyIteratorReachesEnd(iter);
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count,
++expected_reseek);
iter->SeekToLast();
VerifyIteratorReachesEnd(iter);
ASSERT_EQ(get_perf_context()->internal_range_del_reseek_count,
++expected_reseek);
}
delete iter;
// Check L1 LevelIterator behavior
ColumnFamilyData* cfd =
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd();
SuperVersion* sv = cfd->GetSuperVersion();
Arena arena;
ReadOptions read_options;
MergeIteratorBuilder merge_iter_builder(&cfd->internal_comparator(), &arena,
false /* prefix seek */);
InternalIterator* level_iter = sv->current->TEST_GetLevelIterator(
read_options, &merge_iter_builder, 1 /* level */, true);
// This is needed to make LevelIterator range tombstone aware
auto miter = merge_iter_builder.Finish();
auto k = Key(3);
IterKey target;
target.SetInternalKey(k, kMaxSequenceNumber, kValueTypeForSeek);
level_iter->Seek(target.GetInternalKey());
// sentinel key (file boundary as a fake key)
VerifyIteratorKey(level_iter, {Key(5)});
VerifyIteratorReachesEnd(level_iter);
k = Key(5);
target.SetInternalKey(k, 0, kValueTypeForSeekForPrev);
level_iter->SeekForPrev(target.GetInternalKey());
VerifyIteratorKey(level_iter, {Key(3)}, false);
VerifyIteratorReachesEnd(level_iter);
level_iter->SeekToFirst();
VerifyIteratorKey(level_iter, {Key(5)});
VerifyIteratorReachesEnd(level_iter);
level_iter->SeekToLast();
VerifyIteratorKey(level_iter, {Key(3)}, false);
VerifyIteratorReachesEnd(level_iter);
miter->~InternalIterator();
}
TEST_F(DBRangeDelTest, TombstoneOnlyWithOlderVisibleKey) {
// L1: [3, 5)
// L2: 2, 4, 5
// 2 and 5 should be visible
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(2), "foo"));
ASSERT_OK(db_->Put(WriteOptions(), Key(4), "bar"));
ASSERT_OK(db_->Put(WriteOptions(), Key(5), "foobar"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// l1
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(3),
Key(5)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
auto iter_test_backward = [&] {
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(5));
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(2));
iter->Prev();
VerifyIteratorReachesEnd(iter);
};
auto iter_test_forward = [&] {
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(2));
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(5));
iter->Next();
VerifyIteratorReachesEnd(iter);
};
iter->Seek(Key(4));
iter_test_backward();
iter->SeekForPrev(Key(4));
iter->Next();
iter_test_backward();
iter->Seek(Key(4));
iter->Prev();
iter_test_forward();
iter->SeekForPrev(Key(4));
iter_test_forward();
iter->SeekToFirst();
iter_test_forward();
iter->SeekToLast();
iter_test_backward();
delete iter;
}
TEST_F(DBRangeDelTest, TombstoneSentinelDirectionChange) {
// L1: 7
// L2: [4, 6)
// L3: 4
// Seek(5) will have sentinel key 6 at the top of minHeap in merging iterator.
// then do a prev, how would sentinel work?
// Redo the test after Put(5) into L1 so that there is a visible key in range
// [4, 6).
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
// L3
ASSERT_OK(db_->Put(WriteOptions(), Key(4), "bar"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(3);
ASSERT_EQ(1, NumTableFilesAtLevel(3));
// L2
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(4),
Key(6)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1
ASSERT_OK(db_->Put(WriteOptions(), Key(7), "foobar"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek(Key(5));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(7));
iter->Prev();
ASSERT_TRUE(!iter->Valid() && iter->status().ok());
delete iter;
ASSERT_OK(db_->Put(WriteOptions(), Key(5), "foobar"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
iter = db_->NewIterator(ReadOptions());
iter->Seek(Key(5));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(5));
iter->Prev();
ASSERT_TRUE(!iter->Valid() && iter->status().ok());
delete iter;
}
// Right sentinel tested in many test cases above
TEST_F(DBRangeDelTest, LeftSentinelKeyTest) {
// L1_0: 0, 1 L1_1: [2, 3), 5
// L2: 2
// SeekForPrev(4) should give 1 due to sentinel key keeping [2, 3) alive.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
options.max_compaction_bytes = 2048;
DestroyAndReopen(options);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(2), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_0
Random rnd(301);
ASSERT_OK(db_->Put(WriteOptions(), Key(0), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L1_1
ASSERT_OK(db_->Put(WriteOptions(), Key(5), "bar"));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(3)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
iter->SeekForPrev(Key(4));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(1));
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(0));
iter->Prev();
ASSERT_TRUE(!iter->Valid());
ASSERT_OK(iter->status());
delete iter;
}
TEST_F(DBRangeDelTest, LeftSentinelKeyTestWithNewerKey) {
// L1_0: 1, 2 newer than L1_1, L1_1: [2, 4), 5
// L2: 3
// SeekForPrev(4) then Prev() should give 2 and then 1.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
options.max_compaction_bytes = 3 * 1024;
DestroyAndReopen(options);
// L2
ASSERT_OK(db_->Put(WriteOptions(), Key(3), "foo"));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1_1
ASSERT_OK(db_->Put(WriteOptions(), Key(5), "bar"));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(4)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L1_0
Random rnd(301);
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(2), rnd.RandomString(4 << 10)));
// Used to verify sequence number of iterator key later.
auto seq = dbfull()->TEST_GetLastVisibleSequence();
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
Arena arena;
InternalKeyComparator icmp(options.comparator);
ReadOptions read_options;
ScopedArenaIterator iter;
iter.set(
dbfull()->NewInternalIterator(read_options, &arena, kMaxSequenceNumber));
auto k = Key(4);
IterKey target;
target.SetInternalKey(k, 0 /* sequence_number */, kValueTypeForSeekForPrev);
iter->SeekForPrev(target.GetInternalKey());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->user_key(), Key(2));
SequenceNumber actual_seq;
ValueType type;
UnPackSequenceAndType(ExtractInternalKeyFooter(iter->key()), &actual_seq,
&type);
ASSERT_EQ(seq, actual_seq);
// might as well check type
ASSERT_EQ(type, kTypeValue);
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->user_key(), Key(1));
iter->Prev();
ASSERT_TRUE(!iter->Valid());
ASSERT_OK(iter->status());
}
TEST_F(DBRangeDelTest, SentinelKeyCommonCaseTest) {
// L1 has 3 files
// L1_0: 1, 2 L1_1: [3, 4) 5, 6, [7, 8) L1_2: 9
// Check iterator operations on LevelIterator.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.target_file_size_base = 3 * 1024;
DestroyAndReopen(options);
Random rnd(301);
// L1_0
ASSERT_OK(db_->Put(WriteOptions(), Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(2), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
// L1_1
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(3),
Key(4)));
ASSERT_OK(db_->Put(WriteOptions(), Key(5), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Put(WriteOptions(), Key(6), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(7),
Key(8)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(2, NumTableFilesAtLevel(1));
// L1_2
ASSERT_OK(db_->Put(WriteOptions(), Key(9), rnd.RandomString(4 << 10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(3, NumTableFilesAtLevel(1));
ColumnFamilyData* cfd =
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd();
SuperVersion* sv = cfd->GetSuperVersion();
Arena arena;
ReadOptions read_options;
MergeIteratorBuilder merge_iter_builder(&cfd->internal_comparator(), &arena,
false /* prefix seek */);
InternalIterator* level_iter = sv->current->TEST_GetLevelIterator(
read_options, &merge_iter_builder, 1 /* level */, true);
// This is needed to make LevelIterator range tombstone aware
auto miter = merge_iter_builder.Finish();
auto k = Key(7);
IterKey target;
target.SetInternalKey(k, kMaxSequenceNumber, kValueTypeForSeek);
level_iter->Seek(target.GetInternalKey());
// The last Key(9) is a sentinel key.
VerifyIteratorKey(level_iter, {Key(8), Key(9), Key(9)});
ASSERT_TRUE(!level_iter->Valid() && level_iter->status().ok());
k = Key(6);
target.SetInternalKey(k, kMaxSequenceNumber, kValueTypeForSeek);
level_iter->Seek(target.GetInternalKey());
VerifyIteratorKey(level_iter, {Key(6), Key(8), Key(9), Key(9)});
ASSERT_TRUE(!level_iter->Valid() && level_iter->status().ok());
k = Key(4);
target.SetInternalKey(k, 0, kValueTypeForSeekForPrev);
level_iter->SeekForPrev(target.GetInternalKey());
VerifyIteratorKey(level_iter, {Key(3), Key(2), Key(1), Key(1)}, false);
ASSERT_TRUE(!level_iter->Valid() && level_iter->status().ok());
k = Key(5);
target.SetInternalKey(k, 0, kValueTypeForSeekForPrev);
level_iter->SeekForPrev(target.GetInternalKey());
VerifyIteratorKey(level_iter, {Key(5), Key(3), Key(2), Key(1), Key(1)},
false);
level_iter->SeekToFirst();
VerifyIteratorKey(level_iter, {Key(1), Key(2), Key(2), Key(5), Key(6), Key(8),
Key(9), Key(9)});
ASSERT_TRUE(!level_iter->Valid() && level_iter->status().ok());
level_iter->SeekToLast();
VerifyIteratorKey(
level_iter,
{Key(9), Key(9), Key(6), Key(5), Key(3), Key(2), Key(1), Key(1)}, false);
ASSERT_TRUE(!level_iter->Valid() && level_iter->status().ok());
miter->~InternalIterator();
}
TEST_F(DBRangeDelTest, PrefixSentinelKey) {
// L1: ['aaaa', 'aaad'), 'bbbb'
// L2: 'aaac', 'aaae'
// Prefix extracts first 3 chars
// Seek('aaab') should give 'aaae' as first key.
// This is to test a previous bug where prefix seek sees there is no prefix in
// the SST file, and will just set file iter to null in LevelIterator and may
// just skip to the next SST file. But in this case, we should keep the file's
// tombstone alive.
Options options = CurrentOptions();
options.compression = kNoCompression;
options.disable_auto_compactions = true;
options.prefix_extractor.reset(NewFixedPrefixTransform(3));
BlockBasedTableOptions table_options;
table_options.filter_policy.reset(NewBloomFilterPolicy(10, false));
table_options.whole_key_filtering = false;
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
DestroyAndReopen(options);
Random rnd(301);
// L2:
ASSERT_OK(db_->Put(WriteOptions(), "aaac", rnd.RandomString(10)));
ASSERT_OK(db_->Put(WriteOptions(), "aaae", rnd.RandomString(10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(2);
ASSERT_EQ(1, NumTableFilesAtLevel(2));
// L1
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "aaaa",
"aaad"));
ASSERT_OK(db_->Put(WriteOptions(), "bbbb", rnd.RandomString(10)));
ASSERT_OK(db_->Flush(FlushOptions()));
MoveFilesToLevel(1);
ASSERT_EQ(1, NumTableFilesAtLevel(1));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek("aaab");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), "aaae");
delete iter;
}
TEST_F(DBRangeDelTest, RefreshMemtableIter) {
Options options = CurrentOptions();
options.disable_auto_compactions = true;
DestroyAndReopen(options);
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ReadOptions ro;
ro.read_tier = kMemtableTier;
std::unique_ptr<Iterator> iter{db_->NewIterator(ro)};
ASSERT_OK(Flush());
// First refresh reinits iter, which had a bug where
// iter.memtable_range_tombstone_iter_ was not set to nullptr, and caused
// subsequent refresh to double free.
ASSERT_OK(iter->Refresh());
ASSERT_OK(iter->Refresh());
}
TEST_F(DBRangeDelTest, RangeTombstoneRespectIterateUpperBound) {
// Memtable: a, [b, bz)
// Do a Seek on `a` with iterate_upper_bound being az
// range tombstone [b, bz) should not be processed (added to and
// popped from the min_heap in MergingIterator).
Options options = CurrentOptions();
options.disable_auto_compactions = true;
DestroyAndReopen(options);
ASSERT_OK(Put("a", "bar"));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "b", "bz"));
// I could not find a cleaner way to test this without relying on
// implementation detail. Tried to test the value of
// `internal_range_del_reseek_count` but that did not work
// since BlockBasedTable iterator becomes !Valid() when point key
// is out of bound and that reseek only happens when a point key
// is covered by some range tombstone.
SyncPoint::GetInstance()->SetCallBack("MergeIterator::PopDeleteRangeStart",
[](void*) {
// there should not be any range
// tombstone in the heap.
FAIL();
});
SyncPoint::GetInstance()->EnableProcessing();
ReadOptions read_opts;
std::string upper_bound = "az";
Slice upper_bound_slice = upper_bound;
read_opts.iterate_upper_bound = &upper_bound_slice;
std::unique_ptr<Iterator> iter{db_->NewIterator(read_opts)};
iter->Seek("a");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), "a");
iter->Next();
ASSERT_FALSE(iter->Valid());
ASSERT_OK(iter->status());
}
TEST_F(DBRangeDelTest, RangetombesoneCompensateFilesize) {
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
DestroyAndReopen(opts);
std::vector<std::string> values;
Random rnd(301);
// file in L2
values.push_back(rnd.RandomString(1 << 10));
ASSERT_OK(Put("a", values.back()));
values.push_back(rnd.RandomString(1 << 10));
ASSERT_OK(Put("b", values.back()));
ASSERT_OK(Flush());
MoveFilesToLevel(2);
uint64_t l2_size = 0;
ASSERT_OK(Size("a", "c", 0 /* cf */, &l2_size));
ASSERT_GT(l2_size, 0);
// file in L1
values.push_back(rnd.RandomString(1 << 10));
ASSERT_OK(Put("d", values.back()));
values.push_back(rnd.RandomString(1 << 10));
ASSERT_OK(Put("e", values.back()));
ASSERT_OK(Flush());
MoveFilesToLevel(1);
uint64_t l1_size = 0;
ASSERT_OK(Size("d", "f", 0 /* cf */, &l1_size));
ASSERT_GT(l1_size, 0);
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "f"));
ASSERT_OK(Flush());
// Range deletion compensated size computed during flush time
std::vector<std::vector<FileMetaData>> level_to_files;
dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
&level_to_files);
ASSERT_EQ(level_to_files[0].size(), 1);
ASSERT_EQ(level_to_files[0][0].compensated_range_deletion_size,
l1_size + l2_size);
ASSERT_EQ(level_to_files[1].size(), 1);
ASSERT_EQ(level_to_files[1][0].compensated_range_deletion_size, 0);
ASSERT_EQ(level_to_files[2].size(), 1);
ASSERT_EQ(level_to_files[2][0].compensated_range_deletion_size, 0);
// Range deletion compensated size computed during compaction time
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
ASSERT_EQ(NumTableFilesAtLevel(0), 0);
ASSERT_EQ(NumTableFilesAtLevel(1), 1);
ASSERT_EQ(NumTableFilesAtLevel(2), 1);
dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
&level_to_files);
ASSERT_EQ(level_to_files[1].size(), 1);
ASSERT_EQ(level_to_files[1][0].compensated_range_deletion_size, l2_size);
ASSERT_EQ(level_to_files[2].size(), 1);
ASSERT_EQ(level_to_files[2][0].compensated_range_deletion_size, 0);
}
TEST_F(DBRangeDelTest, RangetombesoneCompensateFilesizePersistDuringReopen) {
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
DestroyAndReopen(opts);
std::vector<std::string> values;
Random rnd(301);
values.push_back(rnd.RandomString(1 << 10));
ASSERT_OK(Put("a", values.back()));
values.push_back(rnd.RandomString(1 << 10));
ASSERT_OK(Put("b", values.back()));
ASSERT_OK(Flush());
MoveFilesToLevel(2);
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "c"));
ASSERT_OK(Flush());
MoveFilesToLevel(1);
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), "a", "z"));
ASSERT_OK(Flush());
std::vector<std::vector<FileMetaData>> level_to_files;
dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
&level_to_files);
ASSERT_EQ(level_to_files[0].size(), 1);
ASSERT_EQ(level_to_files[1].size(), 1);
ASSERT_EQ(level_to_files[2].size(), 1);
uint64_t l2_size = level_to_files[2][0].fd.GetFileSize();
uint64_t l1_size = level_to_files[1][0].fd.GetFileSize();
ASSERT_GT(l2_size, 0);
ASSERT_GT(l1_size, 0);
ASSERT_EQ(level_to_files[0][0].compensated_range_deletion_size,
l1_size + l2_size);
ASSERT_EQ(level_to_files[1][0].compensated_range_deletion_size, l2_size);
Reopen(opts);
dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
&level_to_files);
ASSERT_EQ(level_to_files[0].size(), 1);
ASSERT_EQ(level_to_files[0][0].compensated_range_deletion_size,
l1_size + l2_size);
ASSERT_EQ(level_to_files[1].size(), 1);
ASSERT_EQ(level_to_files[1][0].compensated_range_deletion_size, l2_size);
}
TEST_F(DBRangeDelTest, SingleKeyFile) {
// Test for a bug fix where a range tombstone could be added
// to an SST file while is not within the file's key range.
// Create 3 files in L0 and then L1 where all keys have the same user key
// `Key(2)`. The middle file will contain Key(2)@6 and Key(2)@5. Before fix,
// the range tombstone [Key(2), Key(5))@2 would be added to this file during
// compaction, but it is not in this file's key range.
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
opts.target_file_size_base = 1 << 10;
opts.level_compaction_dynamic_file_size = false;
DestroyAndReopen(opts);
// prevent range tombstone drop
std::vector<const Snapshot*> snapshots;
snapshots.push_back(db_->GetSnapshot());
// write a key to bottommost file so the compactions below
// are not bottommost compactions and will calculate
// compensated range tombstone size. Before bug fix, an assert would fail
// during this process.
Random rnd(301);
ASSERT_OK(Put(Key(2), rnd.RandomString(8 << 10)));
ASSERT_OK(Flush());
MoveFilesToLevel(6);
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(5)));
snapshots.push_back(db_->GetSnapshot());
std::vector<std::string> values;
values.push_back(rnd.RandomString(8 << 10));
ASSERT_OK(Put(Key(2), rnd.RandomString(8 << 10)));
snapshots.push_back(db_->GetSnapshot());
ASSERT_OK(Flush());
ASSERT_OK(Put(Key(2), rnd.RandomString(8 << 10)));
snapshots.push_back(db_->GetSnapshot());
ASSERT_OK(Flush());
ASSERT_OK(Put(Key(2), rnd.RandomString(8 << 10)));
snapshots.push_back(db_->GetSnapshot());
ASSERT_OK(Flush());
ASSERT_EQ(NumTableFilesAtLevel(0), 3);
CompactRangeOptions co;
co.bottommost_level_compaction = BottommostLevelCompaction::kForce;
ASSERT_OK(dbfull()->RunManualCompaction(
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd(),
0, 1, co, nullptr, nullptr, true, true,
std::numeric_limits<uint64_t>::max() /*max_file_num_to_ignore*/,
"" /*trim_ts*/));
for (const auto s : snapshots) {
db_->ReleaseSnapshot(s);
}
}
TEST_F(DBRangeDelTest, DoubleCountRangeTombstoneCompensatedSize) {
// Test for a bug fix if a file has multiple range tombstones
// with same start and end key but with different sequence numbers,
// we should only calculate compensated range tombstone size
// for one of them.
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
DestroyAndReopen(opts);
std::vector<std::string> values;
Random rnd(301);
// file in L2
ASSERT_OK(Put(Key(1), rnd.RandomString(1 << 10)));
ASSERT_OK(Put(Key(2), rnd.RandomString(1 << 10)));
ASSERT_OK(Flush());
MoveFilesToLevel(2);
uint64_t l2_size = 0;
ASSERT_OK(Size(Key(1), Key(3), 0 /* cf */, &l2_size));
ASSERT_GT(l2_size, 0);
// file in L1
ASSERT_OK(Put(Key(3), rnd.RandomString(1 << 10)));
ASSERT_OK(Put(Key(4), rnd.RandomString(1 << 10)));
ASSERT_OK(Flush());
MoveFilesToLevel(1);
uint64_t l1_size = 0;
ASSERT_OK(Size(Key(3), Key(5), 0 /* cf */, &l1_size));
ASSERT_GT(l1_size, 0);
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(1),
Key(5)));
// so that the range tombstone above is not dropped
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(1),
Key(5)));
ASSERT_OK(Flush());
// Range deletion compensated size computed during flush time
std::vector<std::vector<FileMetaData>> level_to_files;
dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
&level_to_files);
ASSERT_EQ(level_to_files[0].size(), 1);
// instead of 2 * (l1_size + l2_size)
ASSERT_EQ(level_to_files[0][0].compensated_range_deletion_size,
l1_size + l2_size);
// Range deletion compensated size computed during compaction time
ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
true /* disallow_trivial_move */));
dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
&level_to_files);
ASSERT_EQ(level_to_files[1].size(), 1);
ASSERT_EQ(level_to_files[1][0].compensated_range_deletion_size, l2_size);
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, AddRangeDelsSameLowerAndUpperBound) {
// Test for an edge case where CompactionOutputs::AddRangeDels()
// is called with an empty range: `range_tombstone_lower_bound_` is not empty
// and have the same user_key and sequence number as `next_table_min_key.
// This used to cause file's smallest and largest key to be incorrectly set
// such that smallest > largest, and fail some assertions in iterator and/or
// assertion in VersionSet::ApproximateSize().
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
opts.target_file_size_base = 1 << 10;
opts.level_compaction_dynamic_file_size = false;
DestroyAndReopen(opts);
Random rnd(301);
// Create file at bottommost level so the manual compaction below is
// non-bottommost level and goes through code path like compensate range
// tombstone size.
ASSERT_OK(Put(Key(1), "v1"));
ASSERT_OK(Put(Key(4), "v2"));
ASSERT_OK(Flush());
MoveFilesToLevel(6);
ASSERT_OK(Put(Key(1), rnd.RandomString(4 << 10)));
ASSERT_OK(Put(Key(3), rnd.RandomString(4 << 10)));
// So Key(3) does not get dropped.
const Snapshot* snapshot = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(4)));
ASSERT_OK(Flush());
ASSERT_OK(Put(Key(3), rnd.RandomString(4 << 10)));
ASSERT_OK(Put(Key(4), rnd.RandomString(4 << 10)));
ASSERT_OK(Flush());
MoveFilesToLevel(1);
// Each file will have two keys, with Key(3) straddle between two files.
// File 1: Key(1)@1, Key(3)@6, DeleteRange ends at Key(3)@6
// File 2: Key(3)@4, Key(4)@7, DeleteRange start from Key(3)@4
ASSERT_EQ(NumTableFilesAtLevel(1), 2);
// Manually update compaction output file cutting decisions
// to cut before range tombstone sentinel Key(3)@4
// and the point key Key(3)@4 itself
SyncPoint::GetInstance()->SetCallBack(
"CompactionOutputs::ShouldStopBefore::manual_decision", [opts](void* p) {
auto* pair = (std::pair<bool*, const Slice>*)p;
if ((opts.comparator->Compare(ExtractUserKey(pair->second), Key(3)) ==
0) &&
(GetInternalKeySeqno(pair->second) <= 4)) {
*(pair->first) = true;
}
});
SyncPoint::GetInstance()->EnableProcessing();
std::string begin_key = Key(0);
std::string end_key = Key(5);
Slice begin_slice{begin_key};
Slice end_slice{end_key};
ASSERT_OK(dbfull()->RunManualCompaction(
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd(),
1, 2, CompactRangeOptions(), &begin_slice, &end_slice, true,
true /* disallow_trivial_move */,
std::numeric_limits<uint64_t>::max() /*max_file_num_to_ignore*/,
"" /*trim_ts*/));
// iterate through to check if any assertion breaks
std::unique_ptr<Iterator> iter{db_->NewIterator(ReadOptions())};
iter->SeekToFirst();
std::vector<int> expected{1, 3, 4};
for (auto i : expected) {
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(i));
iter->Next();
}
ASSERT_TRUE(iter->status().ok() && !iter->Valid());
db_->ReleaseSnapshot(snapshot);
}
TEST_F(DBRangeDelTest, AddRangeDelsSingleUserKeyTombstoneOnlyFile) {
// Test for an edge case where CompactionOutputs::AddRangeDels()
// is called with an SST file that has no point keys, and that
// the lower bound and upper bound have the same user key.
// This could cause a file's smallest and largest key to be incorrectly set
// such that smallest > largest, and fail some assertions in iterator and/or
// assertion in VersionSet::ApproximateSize().
Options opts = CurrentOptions();
opts.disable_auto_compactions = true;
opts.target_file_size_base = 1 << 10;
opts.level_compaction_dynamic_file_size = false;
DestroyAndReopen(opts);
Random rnd(301);
// Create file at bottommost level so the manual compaction below is
// non-bottommost level and goes through code path like compensate range
// tombstone size.
ASSERT_OK(Put(Key(1), "v1"));
ASSERT_OK(Put(Key(4), "v2"));
ASSERT_OK(Flush());
MoveFilesToLevel(6);
ASSERT_OK(Put(Key(1), rnd.RandomString(10)));
// Key(3)@4
ASSERT_OK(Put(Key(3), rnd.RandomString(10)));
const Snapshot* snapshot1 = db_->GetSnapshot();
// Key(3)@5
ASSERT_OK(Put(Key(3), rnd.RandomString(10)));
const Snapshot* snapshot2 = db_->GetSnapshot();
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), Key(2),
Key(4)));
// Key(3)@7
ASSERT_OK(Put(Key(3), rnd.RandomString(10)));
ASSERT_OK(Flush());
// L0 -> L1 compaction: cut output into two files:
// File 1: Key(1), Key(3)@7, Range tombstone ends at Key(3)@7
// File 2: Key(3)@5, Key(3)@4, Range tombstone starts from Key(3)@5
SyncPoint::GetInstance()->SetCallBack(
"CompactionOutputs::ShouldStopBefore::manual_decision", [opts](void* p) {
auto* pair = (std::pair<bool*, const Slice>*)p;
if ((opts.comparator->Compare(ExtractUserKey(pair->second), Key(3)) ==
0) &&
(GetInternalKeySeqno(pair->second) <= 6)) {
*(pair->first) = true;
SyncPoint::GetInstance()->DisableProcessing();
}
});
SyncPoint::GetInstance()->EnableProcessing();
std::string begin_key = Key(0);
std::string end_key = Key(5);
Slice begin_slice{begin_key};
Slice end_slice{end_key};
ASSERT_OK(dbfull()->RunManualCompaction(
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd(),
0, 1, CompactRangeOptions(), &begin_slice, &end_slice, true,
true /* disallow_trivial_move */,
std::numeric_limits<uint64_t>::max() /*max_file_num_to_ignore*/,
"" /*trim_ts*/));
ASSERT_EQ(NumTableFilesAtLevel(1), 2);
// L1 -> L2 compaction, drop the snapshot protecting Key(3)@5.
// Let ShouldStopBefore() return true for Key(3)@5 (delete range sentinel)
// and Key(3)@4.
// Output should have two files:
// File 1: Key(1), Key(3)@7, range tombstone ends at Key(3)@7
// File dropped: range tombstone only file (from Key(3)@5 to Key(3)@4)
// File 2: Range tombstone starting from Key(3)@4, Key(3)@4
db_->ReleaseSnapshot(snapshot2);
SyncPoint::GetInstance()->SetCallBack(
"CompactionOutputs::ShouldStopBefore::manual_decision", [opts](void* p) {
auto* pair = (std::pair<bool*, const Slice>*)p;
if ((opts.comparator->Compare(ExtractUserKey(pair->second), Key(3)) ==
0) &&
(GetInternalKeySeqno(pair->second) <= 6)) {
*(pair->first) = true;
}
});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(dbfull()->RunManualCompaction(
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd(),
1, 2, CompactRangeOptions(), &begin_slice, &end_slice, true,
true /* disallow_trivial_move */,
std::numeric_limits<uint64_t>::max() /*max_file_num_to_ignore*/,
"" /*trim_ts*/));
ASSERT_EQ(NumTableFilesAtLevel(2), 2);
// iterate through to check if any assertion breaks
std::unique_ptr<Iterator> iter{db_->NewIterator(ReadOptions())};
iter->SeekToFirst();
std::vector<int> expected{1, 3, 4};
for (auto i : expected) {
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key(), Key(i));
iter->Next();
}
ASSERT_TRUE(iter->status().ok() && !iter->Valid());
db_->ReleaseSnapshot(snapshot1);
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
