Revision df5eeb85caf76a2f038d4029f95de36b91ee0054 authored by Yi Wu on 13 November 2016, 21:00:52 UTC, committed by Facebook Github Bot on 13 November 2016, 21:09:16 UTC
Summary: Implement a insert hint into skip-list to hint insert position. This is to optimize for the write workload where there are multiple stream of sequential writes. For example, there is a stream of keys of a1, a2, a3... but also b1, b2, b2... Each stream are not neccessary strictly sequential, but can get reorder a little bit. User can specify a prefix extractor and the `SkipListRep` can thus maintan a hint for each of the stream for fast insert into memtable. This is the internal implementation part. See #1419 for the interface part. See inline comments for details. Closes https://github.com/facebook/rocksdb/pull/1449 Differential Revision: D4106781 Pulled By: yiwu-arbug fbshipit-source-id: f4d48c4
1 parent 5ed6508
crc32c_test.cc
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "util/crc32c.h"
#include "util/testharness.h"
namespace rocksdb {
namespace crc32c {
class CRC { };
TEST(CRC, StandardResults) {
// From rfc3720 section B.4.
char buf[32];
memset(buf, 0, sizeof(buf));
ASSERT_EQ(0x8a9136aaU, Value(buf, sizeof(buf)));
memset(buf, 0xff, sizeof(buf));
ASSERT_EQ(0x62a8ab43U, Value(buf, sizeof(buf)));
for (int i = 0; i < 32; i++) {
buf[i] = i;
}
ASSERT_EQ(0x46dd794eU, Value(buf, sizeof(buf)));
for (int i = 0; i < 32; i++) {
buf[i] = 31 - i;
}
ASSERT_EQ(0x113fdb5cU, Value(buf, sizeof(buf)));
unsigned char data[48] = {
0x01, 0xc0, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x14, 0x00, 0x00, 0x00,
0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x14,
0x00, 0x00, 0x00, 0x18,
0x28, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x02, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
ASSERT_EQ(0xd9963a56, Value(reinterpret_cast<char*>(data), sizeof(data)));
}
TEST(CRC, Values) {
ASSERT_NE(Value("a", 1), Value("foo", 3));
}
TEST(CRC, Extend) {
ASSERT_EQ(Value("hello world", 11),
Extend(Value("hello ", 6), "world", 5));
}
TEST(CRC, Mask) {
uint32_t crc = Value("foo", 3);
ASSERT_NE(crc, Mask(crc));
ASSERT_NE(crc, Mask(Mask(crc)));
ASSERT_EQ(crc, Unmask(Mask(crc)));
ASSERT_EQ(crc, Unmask(Unmask(Mask(Mask(crc)))));
}
} // namespace crc32c
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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