mirror of
https://github.com/facebook/rocksdb.git
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15053f3ab4
Summary:
Logically strip the user-defined timestamp when L0 files are created during flush when `AdvancedColumnFamilyOptions.persist_user_defined_timestamps` is false. Logically stripping timestamp here means replacing the original user-defined timestamp with a mininum timestamp, which for now is hard coded to be all zeros bytes.
While working on this, I caught a missing piece on the `BlockBuilder` level for this feature. The current quick path `std::min(buffer_size, last_key_size)` needs a bit tweaking to work for this feature. When user-defined timestamp is stripped during block building, on writing first entry or right after resetting, `buffer` is empty and `buffer_size` is zero as usual. However, in follow-up writes, depending on the size of the stripped user-defined timestamp, and the size of the value, what's in `buffer` can sometimes be smaller than `last_key_size`, leading `std::min(buffer_size, last_key_size)` to truncate the `last_key`. Previous test doesn't caught the bug because in those tests, the size of the stripped user-defined timestamps bytes is smaller than the length of the value. In order to avoid the conditional operation, this PR changed the original trivial `std::min` operation into an arithmetic operation. Since this is a change in a hot and performance critical path, I did the following benchmark to check no observable regression is introduced.
```TEST_TMPDIR=/dev/shm/rocksdb1 ./db_bench -benchmarks=fillseq -memtablerep=vector -allow_concurrent_memtable_write=false -num=50000000```
Compiled with DEBUG_LEVEL=0
Test vs. control runs simulaneous for better accuracy, units = ops/sec
PR vs base:
Round 1: 350652 vs 349055
Round 2: 365733 vs 364308
Round 3: 355681 vs 354475
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11557
Test Plan:
New timestamp specific test added or existing tests augmented, both are parameterized with `UserDefinedTimestampTestMode`:
`UserDefinedTimestampTestMode::kNormal` -> UDT feature enabled, write / read with min timestamp
`UserDefinedTimestampTestMode::kStripUserDefinedTimestamps` -> UDT feature enabled, write / read with min timestamp, set Options.persist_user_defined_timestamps to false.
```
make all check
./db_wal_test --gtest_filter="*WithTimestamp*"
./flush_job_test --gtest_filter="*WithTimestamp*"
./repair_test --gtest_filter="*WithTimestamp*"
./block_based_table_reader_test
```
Reviewed By: pdillinger
Differential Revision: D47027664
Pulled By: jowlyzhang
fbshipit-source-id: e729193b6334dfc63aaa736d684d907a022571f5
344 lines
13 KiB
C++
344 lines
13 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/dbformat.h"
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#include "table/block_based/index_builder.h"
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#include "test_util/testharness.h"
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#include "test_util/testutil.h"
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namespace ROCKSDB_NAMESPACE {
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static std::string IKey(const std::string& user_key, uint64_t seq,
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ValueType vt) {
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std::string encoded;
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AppendInternalKey(&encoded, ParsedInternalKey(user_key, seq, vt));
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return encoded;
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}
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static std::string Shorten(const std::string& s, const std::string& l) {
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std::string result = s;
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ShortenedIndexBuilder::FindShortestInternalKeySeparator(*BytewiseComparator(),
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&result, l);
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return result;
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}
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static std::string ShortSuccessor(const std::string& s) {
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std::string result = s;
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ShortenedIndexBuilder::FindShortInternalKeySuccessor(*BytewiseComparator(),
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&result);
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return result;
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}
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static void TestKey(const std::string& key, uint64_t seq, ValueType vt) {
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std::string encoded = IKey(key, seq, vt);
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Slice in(encoded);
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ParsedInternalKey decoded("", 0, kTypeValue);
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ASSERT_OK(ParseInternalKey(in, &decoded, true /* log_err_key */));
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ASSERT_EQ(key, decoded.user_key.ToString());
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ASSERT_EQ(seq, decoded.sequence);
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ASSERT_EQ(vt, decoded.type);
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ASSERT_NOK(ParseInternalKey(Slice("bar"), &decoded, true /* log_err_key */));
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}
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class FormatTest : public testing::Test {};
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TEST_F(FormatTest, InternalKey_EncodeDecode) {
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const char* keys[] = {"", "k", "hello", "longggggggggggggggggggggg"};
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const uint64_t seq[] = {1,
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2,
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3,
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(1ull << 8) - 1,
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1ull << 8,
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(1ull << 8) + 1,
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(1ull << 16) - 1,
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1ull << 16,
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(1ull << 16) + 1,
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(1ull << 32) - 1,
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1ull << 32,
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(1ull << 32) + 1};
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for (unsigned int k = 0; k < sizeof(keys) / sizeof(keys[0]); k++) {
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for (unsigned int s = 0; s < sizeof(seq) / sizeof(seq[0]); s++) {
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TestKey(keys[k], seq[s], kTypeValue);
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TestKey("hello", 1, kTypeDeletion);
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}
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}
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}
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TEST_F(FormatTest, InternalKeyShortSeparator) {
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// When user keys are same
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ASSERT_EQ(IKey("foo", 100, kTypeValue),
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Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 99, kTypeValue)));
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ASSERT_EQ(
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IKey("foo", 100, kTypeValue),
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Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 101, kTypeValue)));
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ASSERT_EQ(
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IKey("foo", 100, kTypeValue),
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Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 100, kTypeValue)));
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ASSERT_EQ(
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IKey("foo", 100, kTypeValue),
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Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 100, kTypeDeletion)));
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// When user keys are misordered
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ASSERT_EQ(IKey("foo", 100, kTypeValue),
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Shorten(IKey("foo", 100, kTypeValue), IKey("bar", 99, kTypeValue)));
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// When user keys are different, but correctly ordered
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ASSERT_EQ(
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IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
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Shorten(IKey("foo", 100, kTypeValue), IKey("hello", 200, kTypeValue)));
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ASSERT_EQ(IKey("ABC2", kMaxSequenceNumber, kValueTypeForSeek),
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Shorten(IKey("ABC1AAAAA", 100, kTypeValue),
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IKey("ABC2ABB", 200, kTypeValue)));
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ASSERT_EQ(IKey("AAA2", kMaxSequenceNumber, kValueTypeForSeek),
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Shorten(IKey("AAA1AAA", 100, kTypeValue),
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IKey("AAA2AA", 200, kTypeValue)));
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ASSERT_EQ(
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IKey("AAA2", kMaxSequenceNumber, kValueTypeForSeek),
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Shorten(IKey("AAA1AAA", 100, kTypeValue), IKey("AAA4", 200, kTypeValue)));
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ASSERT_EQ(
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IKey("AAA1B", kMaxSequenceNumber, kValueTypeForSeek),
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Shorten(IKey("AAA1AAA", 100, kTypeValue), IKey("AAA2", 200, kTypeValue)));
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ASSERT_EQ(IKey("AAA2", kMaxSequenceNumber, kValueTypeForSeek),
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Shorten(IKey("AAA1AAA", 100, kTypeValue),
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IKey("AAA2A", 200, kTypeValue)));
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ASSERT_EQ(
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IKey("AAA1", 100, kTypeValue),
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Shorten(IKey("AAA1", 100, kTypeValue), IKey("AAA2", 200, kTypeValue)));
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// When start user key is prefix of limit user key
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ASSERT_EQ(
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IKey("foo", 100, kTypeValue),
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Shorten(IKey("foo", 100, kTypeValue), IKey("foobar", 200, kTypeValue)));
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// When limit user key is prefix of start user key
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ASSERT_EQ(
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IKey("foobar", 100, kTypeValue),
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Shorten(IKey("foobar", 100, kTypeValue), IKey("foo", 200, kTypeValue)));
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}
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TEST_F(FormatTest, InternalKeyShortestSuccessor) {
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ASSERT_EQ(IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
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ShortSuccessor(IKey("foo", 100, kTypeValue)));
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ASSERT_EQ(IKey("\xff\xff", 100, kTypeValue),
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ShortSuccessor(IKey("\xff\xff", 100, kTypeValue)));
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}
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TEST_F(FormatTest, IterKeyOperation) {
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IterKey k;
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const char p[] = "abcdefghijklmnopqrstuvwxyz";
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const char q[] = "0123456789";
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string(""));
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k.TrimAppend(0, p, 3);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("abc"));
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k.TrimAppend(1, p, 3);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("aabc"));
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k.TrimAppend(0, p, 26);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("abcdefghijklmnopqrstuvwxyz"));
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k.TrimAppend(26, q, 10);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("abcdefghijklmnopqrstuvwxyz0123456789"));
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k.TrimAppend(36, q, 1);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("abcdefghijklmnopqrstuvwxyz01234567890"));
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k.TrimAppend(26, q, 1);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("abcdefghijklmnopqrstuvwxyz0"));
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// Size going up, memory allocation is triggered
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k.TrimAppend(27, p, 26);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string("abcdefghijklmnopqrstuvwxyz0"
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"abcdefghijklmnopqrstuvwxyz"));
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}
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TEST_F(FormatTest, IterKeyWithTimestampOperation) {
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IterKey k;
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k.SetUserKey("");
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const char p[] = "abcdefghijklmnopqrstuvwxyz";
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const char q[] = "0123456789";
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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std::string(""));
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size_t ts_sz = 8;
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std::string min_timestamp(ts_sz, static_cast<unsigned char>(0));
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k.TrimAppendWithTimestamp(0, p, 3, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"abc" + min_timestamp);
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k.TrimAppendWithTimestamp(1, p, 3, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"aabc" + min_timestamp);
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k.TrimAppendWithTimestamp(0, p, 26, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"abcdefghijklmnopqrstuvwxyz" + min_timestamp);
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k.TrimAppendWithTimestamp(26, q, 10, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"abcdefghijklmnopqrstuvwxyz0123456789" + min_timestamp);
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k.TrimAppendWithTimestamp(36, q, 1, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"abcdefghijklmnopqrstuvwxyz01234567890" + min_timestamp);
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k.TrimAppendWithTimestamp(26, q, 1, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"abcdefghijklmnopqrstuvwxyz0" + min_timestamp);
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k.TrimAppendWithTimestamp(27, p, 26, ts_sz);
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ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
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"abcdefghijklmnopqrstuvwxyz0"
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"abcdefghijklmnopqrstuvwxyz" +
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min_timestamp);
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// IterKey holds an internal key, the last 8 bytes hold the key footer, the
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// timestamp is expected to be added before the key footer.
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std::string key_without_ts = "keywithoutts";
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k.SetInternalKey(key_without_ts + min_timestamp + "internal");
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ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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key_without_ts + min_timestamp + "internal");
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k.TrimAppendWithTimestamp(0, p, 10, ts_sz);
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ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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"ab" + min_timestamp + "cdefghij");
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k.TrimAppendWithTimestamp(1, p, 8, ts_sz);
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ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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"a" + min_timestamp + "abcdefgh");
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k.TrimAppendWithTimestamp(9, p, 3, ts_sz);
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ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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"aabc" + min_timestamp + "defghabc");
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k.TrimAppendWithTimestamp(10, q, 10, ts_sz);
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ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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"aabcdefgha01" + min_timestamp + "23456789");
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k.TrimAppendWithTimestamp(20, q, 1, ts_sz);
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ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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"aabcdefgha012" + min_timestamp + "34567890");
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k.TrimAppendWithTimestamp(21, p, 26, ts_sz);
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ASSERT_EQ(
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std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
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"aabcdefgha01234567890abcdefghijklmnopqr" + min_timestamp + "stuvwxyz");
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}
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TEST_F(FormatTest, UpdateInternalKey) {
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std::string user_key("abcdefghijklmnopqrstuvwxyz");
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uint64_t new_seq = 0x123456;
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ValueType new_val_type = kTypeDeletion;
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std::string ikey;
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AppendInternalKey(&ikey, ParsedInternalKey(user_key, 100U, kTypeValue));
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size_t ikey_size = ikey.size();
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UpdateInternalKey(&ikey, new_seq, new_val_type);
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ASSERT_EQ(ikey_size, ikey.size());
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Slice in(ikey);
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ParsedInternalKey decoded;
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ASSERT_OK(ParseInternalKey(in, &decoded, true /* log_err_key */));
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ASSERT_EQ(user_key, decoded.user_key.ToString());
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ASSERT_EQ(new_seq, decoded.sequence);
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ASSERT_EQ(new_val_type, decoded.type);
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}
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TEST_F(FormatTest, RangeTombstoneSerializeEndKey) {
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RangeTombstone t("a", "b", 2);
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InternalKey k("b", 3, kTypeValue);
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const InternalKeyComparator cmp(BytewiseComparator());
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ASSERT_LT(cmp.Compare(t.SerializeEndKey(), k), 0);
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}
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TEST_F(FormatTest, PadInternalKeyWithMinTimestamp) {
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std::string orig_user_key = "foo";
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std::string orig_internal_key = IKey(orig_user_key, 100, kTypeValue);
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size_t ts_sz = 8;
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std::string key_buf;
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PadInternalKeyWithMinTimestamp(&key_buf, orig_internal_key, ts_sz);
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ParsedInternalKey key_with_timestamp;
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Slice in(key_buf);
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ASSERT_OK(ParseInternalKey(in, &key_with_timestamp, true /*log_err_key*/));
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std::string min_timestamp(ts_sz, static_cast<unsigned char>(0));
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ASSERT_EQ(orig_user_key + min_timestamp, key_with_timestamp.user_key);
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ASSERT_EQ(100, key_with_timestamp.sequence);
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ASSERT_EQ(kTypeValue, key_with_timestamp.type);
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}
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TEST_F(FormatTest, StripTimestampFromInternalKey) {
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std::string orig_user_key = "foo";
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size_t ts_sz = 8;
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std::string timestamp(ts_sz, static_cast<unsigned char>(0));
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orig_user_key.append(timestamp.data(), timestamp.size());
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std::string orig_internal_key = IKey(orig_user_key, 100, kTypeValue);
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std::string key_buf;
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StripTimestampFromInternalKey(&key_buf, orig_internal_key, ts_sz);
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ParsedInternalKey key_without_timestamp;
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Slice in(key_buf);
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ASSERT_OK(ParseInternalKey(in, &key_without_timestamp, true /*log_err_key*/));
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ASSERT_EQ("foo", key_without_timestamp.user_key);
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ASSERT_EQ(100, key_without_timestamp.sequence);
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ASSERT_EQ(kTypeValue, key_without_timestamp.type);
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}
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TEST_F(FormatTest, ReplaceInternalKeyWithMinTimestamp) {
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std::string orig_user_key = "foo";
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size_t ts_sz = 8;
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orig_user_key.append(ts_sz, static_cast<unsigned char>(1));
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std::string orig_internal_key = IKey(orig_user_key, 100, kTypeValue);
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std::string key_buf;
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ReplaceInternalKeyWithMinTimestamp(&key_buf, orig_internal_key, ts_sz);
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ParsedInternalKey new_key;
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Slice in(key_buf);
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ASSERT_OK(ParseInternalKey(in, &new_key, true /*log_err_key*/));
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std::string min_timestamp(ts_sz, static_cast<unsigned char>(0));
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size_t ukey_diff_offset = new_key.user_key.difference_offset(orig_user_key);
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ASSERT_EQ(min_timestamp,
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Slice(new_key.user_key.data() + ukey_diff_offset, ts_sz));
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ASSERT_EQ(orig_user_key.size(), new_key.user_key.size());
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ASSERT_EQ(100, new_key.sequence);
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ASSERT_EQ(kTypeValue, new_key.type);
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}
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} // namespace ROCKSDB_NAMESPACE
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int main(int argc, char** argv) {
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ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
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::testing::InitGoogleTest(&argc, argv);
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RegisterCustomObjects(argc, argv);
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return RUN_ALL_TESTS();
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}
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