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rocksdb/db/dbformat_test.cc
Peter Dillinger f456a7213f Refactor IndexBuilder::AddIndexEntry (#12867) 
Summary:
Something I am working on is going to expand usage of `BlockBasedTableBuilder::Rep::last_key`, but the existing code contract for `IndexBuilder::AddIndexEntry` makes that difficult because it modifies its `last_key` parameter to be the separator value recorded in the index, often something between the two boundary keys.

This change primarily changes the contract of that function and related functions to separate function inputs and outputs, without sacrificing efficiency. For efficiency, a reusable scratch string buffer is provided by the caller, which the callee can use (or not) in returning a result Slice. That should yield a performance improvement as we are reusing a buffer for keys rather than copying into a new one each time in the FindShort* functions, without any additional string copies or conditional branches.

Additional improvements in PartitionedIndexBuilder specifically:
* Reduce string copies by eliminating `sub_index_last_key_` and instead tracking the key for the next partition in a placeholder Entry.
* Simplify code and improve code quality by changing `sub_index_builder_` to unique_ptr.
* Eliminate unnecessary NewFlushBlockPolicy call/object.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/12867

Test Plan: existing tests, crash test. Will validate performance along with the change this is setting up.

Reviewed By: anand1976

Differential Revision: D59793119

Pulled By: pdillinger

fbshipit-source-id: 556da75cf13b967511f84702b2713d152f536a07
2024-07-22 14:27:31 -07:00

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// 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).
//
// 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 "db/dbformat.h"
#include "table/block_based/index_builder.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
namespace ROCKSDB_NAMESPACE {
static std::string IKey(const std::string& user_key, uint64_t seq,
ValueType vt) {
std::string encoded;
AppendInternalKey(&encoded, ParsedInternalKey(user_key, seq, vt));
return encoded;
}
static std::string Shorten(const std::string& s, const std::string& l) {
std::string scratch;
return ShortenedIndexBuilder::FindShortestInternalKeySeparator(
*BytewiseComparator(), s, l, &scratch)
.ToString();
}
static std::string ShortSuccessor(const std::string& s) {
std::string scratch;
return ShortenedIndexBuilder::FindShortInternalKeySuccessor(
*BytewiseComparator(), s, &scratch)
.ToString();
}
static void TestKey(const std::string& key, uint64_t seq, ValueType vt) {
std::string encoded = IKey(key, seq, vt);
Slice in(encoded);
ParsedInternalKey decoded("", 0, kTypeValue);
ASSERT_OK(ParseInternalKey(in, &decoded, true /* log_err_key */));
ASSERT_EQ(key, decoded.user_key.ToString());
ASSERT_EQ(seq, decoded.sequence);
ASSERT_EQ(vt, decoded.type);
ASSERT_NOK(ParseInternalKey(Slice("bar"), &decoded, true /* log_err_key */));
}
class FormatTest : public testing::Test {};
TEST_F(FormatTest, InternalKey_EncodeDecode) {
const char* keys[] = {"", "k", "hello", "longggggggggggggggggggggg"};
const uint64_t seq[] = {1,
2,
3,
(1ull << 8) - 1,
1ull << 8,
(1ull << 8) + 1,
(1ull << 16) - 1,
1ull << 16,
(1ull << 16) + 1,
(1ull << 32) - 1,
1ull << 32,
(1ull << 32) + 1};
for (unsigned int k = 0; k < sizeof(keys) / sizeof(keys[0]); k++) {
for (unsigned int s = 0; s < sizeof(seq) / sizeof(seq[0]); s++) {
TestKey(keys[k], seq[s], kTypeValue);
TestKey("hello", 1, kTypeDeletion);
}
}
}
TEST_F(FormatTest, InternalKeyShortSeparator) {
// When user keys are same
ASSERT_EQ(IKey("foo", 100, kTypeValue),
Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 99, kTypeValue)));
ASSERT_EQ(
IKey("foo", 100, kTypeValue),
Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 101, kTypeValue)));
ASSERT_EQ(
IKey("foo", 100, kTypeValue),
Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 100, kTypeValue)));
ASSERT_EQ(
IKey("foo", 100, kTypeValue),
Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 100, kTypeDeletion)));
// When user keys are misordered
ASSERT_EQ(IKey("foo", 100, kTypeValue),
Shorten(IKey("foo", 100, kTypeValue), IKey("bar", 99, kTypeValue)));
// When user keys are different, but correctly ordered
ASSERT_EQ(
IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
Shorten(IKey("foo", 100, kTypeValue), IKey("hello", 200, kTypeValue)));
ASSERT_EQ(IKey("ABC2", kMaxSequenceNumber, kValueTypeForSeek),
Shorten(IKey("ABC1AAAAA", 100, kTypeValue),
IKey("ABC2ABB", 200, kTypeValue)));
ASSERT_EQ(IKey("AAA2", kMaxSequenceNumber, kValueTypeForSeek),
Shorten(IKey("AAA1AAA", 100, kTypeValue),
IKey("AAA2AA", 200, kTypeValue)));
ASSERT_EQ(
IKey("AAA2", kMaxSequenceNumber, kValueTypeForSeek),
Shorten(IKey("AAA1AAA", 100, kTypeValue), IKey("AAA4", 200, kTypeValue)));
ASSERT_EQ(
IKey("AAA1B", kMaxSequenceNumber, kValueTypeForSeek),
Shorten(IKey("AAA1AAA", 100, kTypeValue), IKey("AAA2", 200, kTypeValue)));
ASSERT_EQ(IKey("AAA2", kMaxSequenceNumber, kValueTypeForSeek),
Shorten(IKey("AAA1AAA", 100, kTypeValue),
IKey("AAA2A", 200, kTypeValue)));
ASSERT_EQ(
IKey("AAA1", 100, kTypeValue),
Shorten(IKey("AAA1", 100, kTypeValue), IKey("AAA2", 200, kTypeValue)));
// When start user key is prefix of limit user key
ASSERT_EQ(
IKey("foo", 100, kTypeValue),
Shorten(IKey("foo", 100, kTypeValue), IKey("foobar", 200, kTypeValue)));
// When limit user key is prefix of start user key
ASSERT_EQ(
IKey("foobar", 100, kTypeValue),
Shorten(IKey("foobar", 100, kTypeValue), IKey("foo", 200, kTypeValue)));
}
TEST_F(FormatTest, InternalKeyShortestSuccessor) {
ASSERT_EQ(IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
ShortSuccessor(IKey("foo", 100, kTypeValue)));
ASSERT_EQ(IKey("\xff\xff", 100, kTypeValue),
ShortSuccessor(IKey("\xff\xff", 100, kTypeValue)));
}
TEST_F(FormatTest, IterKeyOperation) {
IterKey k;
const char p[] = "abcdefghijklmnopqrstuvwxyz";
const char q[] = "0123456789";
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string(""));
k.TrimAppend(0, p, 3);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("abc"));
k.TrimAppend(1, p, 3);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("aabc"));
k.TrimAppend(0, p, 26);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("abcdefghijklmnopqrstuvwxyz"));
k.TrimAppend(26, q, 10);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("abcdefghijklmnopqrstuvwxyz0123456789"));
k.TrimAppend(36, q, 1);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("abcdefghijklmnopqrstuvwxyz01234567890"));
k.TrimAppend(26, q, 1);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("abcdefghijklmnopqrstuvwxyz0"));
// Size going up, memory allocation is triggered
k.TrimAppend(27, p, 26);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string("abcdefghijklmnopqrstuvwxyz0"
"abcdefghijklmnopqrstuvwxyz"));
}
TEST_F(FormatTest, IterKeyWithTimestampOperation) {
IterKey k;
k.SetUserKey("");
const char p[] = "abcdefghijklmnopqrstuvwxyz";
const char q[] = "0123456789";
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
std::string(""));
size_t ts_sz = 8;
std::string min_timestamp(ts_sz, static_cast<unsigned char>(0));
k.TrimAppendWithTimestamp(0, p, 3, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"abc" + min_timestamp);
k.TrimAppendWithTimestamp(1, p, 3, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"aabc" + min_timestamp);
k.TrimAppendWithTimestamp(0, p, 26, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"abcdefghijklmnopqrstuvwxyz" + min_timestamp);
k.TrimAppendWithTimestamp(26, q, 10, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"abcdefghijklmnopqrstuvwxyz0123456789" + min_timestamp);
k.TrimAppendWithTimestamp(36, q, 1, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"abcdefghijklmnopqrstuvwxyz01234567890" + min_timestamp);
k.TrimAppendWithTimestamp(26, q, 1, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"abcdefghijklmnopqrstuvwxyz0" + min_timestamp);
k.TrimAppendWithTimestamp(27, p, 26, ts_sz);
ASSERT_EQ(std::string(k.GetUserKey().data(), k.GetUserKey().size()),
"abcdefghijklmnopqrstuvwxyz0"
"abcdefghijklmnopqrstuvwxyz" +
min_timestamp);
// IterKey holds an internal key, the last 8 bytes hold the key footer, the
// timestamp is expected to be added before the key footer.
std::string key_without_ts = "keywithoutts";
k.SetInternalKey(key_without_ts + min_timestamp + "internal");
ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
key_without_ts + min_timestamp + "internal");
k.TrimAppendWithTimestamp(0, p, 10, ts_sz);
ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
"ab" + min_timestamp + "cdefghij");
k.TrimAppendWithTimestamp(1, p, 8, ts_sz);
ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
"a" + min_timestamp + "abcdefgh");
k.TrimAppendWithTimestamp(9, p, 3, ts_sz);
ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
"aabc" + min_timestamp + "defghabc");
k.TrimAppendWithTimestamp(10, q, 10, ts_sz);
ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
"aabcdefgha01" + min_timestamp + "23456789");
k.TrimAppendWithTimestamp(20, q, 1, ts_sz);
ASSERT_EQ(std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
"aabcdefgha012" + min_timestamp + "34567890");
k.TrimAppendWithTimestamp(21, p, 26, ts_sz);
ASSERT_EQ(
std::string(k.GetInternalKey().data(), k.GetInternalKey().size()),
"aabcdefgha01234567890abcdefghijklmnopqr" + min_timestamp + "stuvwxyz");
}
TEST_F(FormatTest, UpdateInternalKey) {
std::string user_key("abcdefghijklmnopqrstuvwxyz");
uint64_t new_seq = 0x123456;
ValueType new_val_type = kTypeDeletion;
std::string ikey;
AppendInternalKey(&ikey, ParsedInternalKey(user_key, 100U, kTypeValue));
size_t ikey_size = ikey.size();
UpdateInternalKey(&ikey, new_seq, new_val_type);
ASSERT_EQ(ikey_size, ikey.size());
Slice in(ikey);
ParsedInternalKey decoded;
ASSERT_OK(ParseInternalKey(in, &decoded, true /* log_err_key */));
ASSERT_EQ(user_key, decoded.user_key.ToString());
ASSERT_EQ(new_seq, decoded.sequence);
ASSERT_EQ(new_val_type, decoded.type);
}
TEST_F(FormatTest, RangeTombstoneSerializeEndKey) {
RangeTombstone t("a", "b", 2);
InternalKey k("b", 3, kTypeValue);
const InternalKeyComparator cmp(BytewiseComparator());
ASSERT_LT(cmp.Compare(t.SerializeEndKey(), k), 0);
}
TEST_F(FormatTest, PadInternalKeyWithMinTimestamp) {
std::string orig_user_key = "foo";
std::string orig_internal_key = IKey(orig_user_key, 100, kTypeValue);
size_t ts_sz = 8;
std::string key_buf;
PadInternalKeyWithMinTimestamp(&key_buf, orig_internal_key, ts_sz);
ParsedInternalKey key_with_timestamp;
Slice in(key_buf);
ASSERT_OK(ParseInternalKey(in, &key_with_timestamp, true /*log_err_key*/));
std::string min_timestamp(ts_sz, static_cast<unsigned char>(0));
ASSERT_EQ(orig_user_key + min_timestamp, key_with_timestamp.user_key);
ASSERT_EQ(100, key_with_timestamp.sequence);
ASSERT_EQ(kTypeValue, key_with_timestamp.type);
}
TEST_F(FormatTest, StripTimestampFromInternalKey) {
std::string orig_user_key = "foo";
size_t ts_sz = 8;
std::string timestamp(ts_sz, static_cast<unsigned char>(0));
orig_user_key.append(timestamp.data(), timestamp.size());
std::string orig_internal_key = IKey(orig_user_key, 100, kTypeValue);
std::string key_buf;
StripTimestampFromInternalKey(&key_buf, orig_internal_key, ts_sz);
ParsedInternalKey key_without_timestamp;
Slice in(key_buf);
ASSERT_OK(ParseInternalKey(in, &key_without_timestamp, true /*log_err_key*/));
ASSERT_EQ("foo", key_without_timestamp.user_key);
ASSERT_EQ(100, key_without_timestamp.sequence);
ASSERT_EQ(kTypeValue, key_without_timestamp.type);
}
TEST_F(FormatTest, ReplaceInternalKeyWithMinTimestamp) {
std::string orig_user_key = "foo";
size_t ts_sz = 8;
orig_user_key.append(ts_sz, static_cast<unsigned char>(1));
std::string orig_internal_key = IKey(orig_user_key, 100, kTypeValue);
std::string key_buf;
ReplaceInternalKeyWithMinTimestamp(&key_buf, orig_internal_key, ts_sz);
ParsedInternalKey new_key;
Slice in(key_buf);
ASSERT_OK(ParseInternalKey(in, &new_key, true /*log_err_key*/));
std::string min_timestamp(ts_sz, static_cast<unsigned char>(0));
size_t ukey_diff_offset = new_key.user_key.difference_offset(orig_user_key);
ASSERT_EQ(min_timestamp,
Slice(new_key.user_key.data() + ukey_diff_offset, ts_sz));
ASSERT_EQ(orig_user_key.size(), new_key.user_key.size());
ASSERT_EQ(100, new_key.sequence);
ASSERT_EQ(kTypeValue, new_key.type);
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
RegisterCustomObjects(argc, argv);
return RUN_ALL_TESTS();
}
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