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db_range_del_test.cc
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// 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.data(), 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_OK(iter->status());
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_OK(iter->status());
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_OK(iter->status());
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;