Revision dae3b5545c556e2479972a21d1ed8850aac0bae8 authored by anand76 on 28 March 2019, 22:13:02 UTC, committed by Facebook Github Bot on 28 March 2019, 22:17:13 UTC
Summary: WAL files are currently not subject to deletion rate limiting by DeleteScheduler. If the size of the WAL files is significant, this can cause a high delete rate on SSDs that may affect other operations. To fix it, force WAL file deletions to go through the SstFileManager. Original PR for this is #2768 Pull Request resolved: https://github.com/facebook/rocksdb/pull/5116 Differential Revision: D14669437 Pulled By: anand1976 fbshipit-source-id: c5f62d0640cebaa1574de841a1d01e4ce2faadf0
1 parent a98317f
column_families_example.cc
// Copyright (c) 2011-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 <cstdio>
#include <string>
#include <vector>
#include "rocksdb/db.h"
#include "rocksdb/slice.h"
#include "rocksdb/options.h"
using namespace rocksdb;
std::string kDBPath = "/tmp/rocksdb_column_families_example";
int main() {
// open DB
Options options;
options.create_if_missing = true;
DB* db;
Status s = DB::Open(options, kDBPath, &db);
assert(s.ok());
// create column family
ColumnFamilyHandle* cf;
s = db->CreateColumnFamily(ColumnFamilyOptions(), "new_cf", &cf);
assert(s.ok());
// close DB
delete cf;
delete db;
// open DB with two column families
std::vector<ColumnFamilyDescriptor> column_families;
// have to open default column family
column_families.push_back(ColumnFamilyDescriptor(
kDefaultColumnFamilyName, ColumnFamilyOptions()));
// open the new one, too
column_families.push_back(ColumnFamilyDescriptor(
"new_cf", ColumnFamilyOptions()));
std::vector<ColumnFamilyHandle*> handles;
s = DB::Open(DBOptions(), kDBPath, column_families, &handles, &db);
assert(s.ok());
// put and get from non-default column family
s = db->Put(WriteOptions(), handles[1], Slice("key"), Slice("value"));
assert(s.ok());
std::string value;
s = db->Get(ReadOptions(), handles[1], Slice("key"), &value);
assert(s.ok());
// atomic write
WriteBatch batch;
batch.Put(handles[0], Slice("key2"), Slice("value2"));
batch.Put(handles[1], Slice("key3"), Slice("value3"));
batch.Delete(handles[0], Slice("key"));
s = db->Write(WriteOptions(), &batch);
assert(s.ok());
// drop column family
s = db->DropColumnFamily(handles[1]);
assert(s.ok());
// close db
for (auto handle : handles) {
delete handle;
}
delete db;
return 0;
}
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