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rocksdb/db/db_iterator_test.cc

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// 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.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
//
// 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 <functional>
#include "db/db_test_util.h"
#include "port/port.h"
#include "port/stack_trace.h"
#include "rocksdb/iostats_context.h"
#include "rocksdb/perf_context.h"
namespace rocksdb {
class DBIteratorTest : public DBTestBase {
public:
DBIteratorTest() : DBTestBase("/db_iterator_test") {}
};
class FlushBlockEveryKeyPolicy : public FlushBlockPolicy {
public:
virtual bool Update(const Slice& key, const Slice& value) override {
if (!start_) {
start_ = true;
return false;
}
return true;
}
private:
bool start_ = false;
};
class FlushBlockEveryKeyPolicyFactory : public FlushBlockPolicyFactory {
public:
explicit FlushBlockEveryKeyPolicyFactory() {}
const char* Name() const override {
return "FlushBlockEveryKeyPolicyFactory";
}
FlushBlockPolicy* NewFlushBlockPolicy(
const BlockBasedTableOptions& table_options,
const BlockBuilder& data_block_builder) const override {
return new FlushBlockEveryKeyPolicy;
}
};
TEST_F(DBIteratorTest, IteratorProperty) {
// The test needs to be changed if kPersistedTier is supported in iterator.
Options options = CurrentOptions();
CreateAndReopenWithCF({"pikachu"}, options);
Put(1, "1", "2");
ReadOptions ropt;
ropt.pin_data = false;
{
unique_ptr<Iterator> iter(db_->NewIterator(ropt, handles_[1]));
iter->SeekToFirst();
std::string prop_value;
ASSERT_NOK(iter->GetProperty("non_existing.value", &prop_value));
ASSERT_OK(iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("0", prop_value);
iter->Next();
ASSERT_OK(iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("Iterator is not valid.", prop_value);
}
Close();
}
TEST_F(DBIteratorTest, PersistedTierOnIterator) {
// The test needs to be changed if kPersistedTier is supported in iterator.
Options options = CurrentOptions();
CreateAndReopenWithCF({"pikachu"}, options);
ReadOptions ropt;
ropt.read_tier = kPersistedTier;
auto* iter = db_->NewIterator(ropt, handles_[1]);
ASSERT_TRUE(iter->status().IsNotSupported());
delete iter;
std::vector<Iterator*> iters;
ASSERT_TRUE(db_->NewIterators(ropt, {handles_[1]}, &iters).IsNotSupported());
Close();
}
TEST_F(DBIteratorTest, NonBlockingIteration) {
do {
ReadOptions non_blocking_opts, regular_opts;
Options options = CurrentOptions();
options.statistics = rocksdb::CreateDBStatistics();
non_blocking_opts.read_tier = kBlockCacheTier;
CreateAndReopenWithCF({"pikachu"}, options);
// write one kv to the database.
ASSERT_OK(Put(1, "a", "b"));
// scan using non-blocking iterator. We should find it because
// it is in memtable.
Iterator* iter = db_->NewIterator(non_blocking_opts, handles_[1]);
int count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_OK(iter->status());
count++;
}
ASSERT_EQ(count, 1);
delete iter;
// flush memtable to storage. Now, the key should not be in the
// memtable neither in the block cache.
ASSERT_OK(Flush(1));
// verify that a non-blocking iterator does not find any
// kvs. Neither does it do any IOs to storage.
uint64_t numopen = TestGetTickerCount(options, NO_FILE_OPENS);
uint64_t cache_added = TestGetTickerCount(options, BLOCK_CACHE_ADD);
iter = db_->NewIterator(non_blocking_opts, handles_[1]);
count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
count++;
}
ASSERT_EQ(count, 0);
ASSERT_TRUE(iter->status().IsIncomplete());
ASSERT_EQ(numopen, TestGetTickerCount(options, NO_FILE_OPENS));
ASSERT_EQ(cache_added, TestGetTickerCount(options, BLOCK_CACHE_ADD));
delete iter;
// read in the specified block via a regular get
ASSERT_EQ(Get(1, "a"), "b");
// verify that we can find it via a non-blocking scan
numopen = TestGetTickerCount(options, NO_FILE_OPENS);
cache_added = TestGetTickerCount(options, BLOCK_CACHE_ADD);
iter = db_->NewIterator(non_blocking_opts, handles_[1]);
count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_OK(iter->status());
count++;
}
ASSERT_EQ(count, 1);
ASSERT_EQ(numopen, TestGetTickerCount(options, NO_FILE_OPENS));
ASSERT_EQ(cache_added, TestGetTickerCount(options, BLOCK_CACHE_ADD));
delete iter;
// This test verifies block cache behaviors, which is not used by plain
// table format.
// Exclude kHashCuckoo as it does not support iteration currently
} while (ChangeOptions(kSkipPlainTable | kSkipNoSeekToLast | kSkipHashCuckoo |
kSkipMmapReads));
}
#ifndef ROCKSDB_LITE
TEST_F(DBIteratorTest, ManagedNonBlockingIteration) {
do {
ReadOptions non_blocking_opts, regular_opts;
Options options = CurrentOptions();
options.statistics = rocksdb::CreateDBStatistics();
non_blocking_opts.read_tier = kBlockCacheTier;
non_blocking_opts.managed = true;
CreateAndReopenWithCF({"pikachu"}, options);
// write one kv to the database.
ASSERT_OK(Put(1, "a", "b"));
// scan using non-blocking iterator. We should find it because
// it is in memtable.
Iterator* iter = db_->NewIterator(non_blocking_opts, handles_[1]);
int count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_OK(iter->status());
count++;
}
ASSERT_EQ(count, 1);
delete iter;
// flush memtable to storage. Now, the key should not be in the
// memtable neither in the block cache.
ASSERT_OK(Flush(1));
// verify that a non-blocking iterator does not find any
// kvs. Neither does it do any IOs to storage.
int64_t numopen = TestGetTickerCount(options, NO_FILE_OPENS);
int64_t cache_added = TestGetTickerCount(options, BLOCK_CACHE_ADD);
iter = db_->NewIterator(non_blocking_opts, handles_[1]);
count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
count++;
}
ASSERT_EQ(count, 0);
ASSERT_TRUE(iter->status().IsIncomplete());
ASSERT_EQ(numopen, TestGetTickerCount(options, NO_FILE_OPENS));
ASSERT_EQ(cache_added, TestGetTickerCount(options, BLOCK_CACHE_ADD));
delete iter;
// read in the specified block via a regular get
ASSERT_EQ(Get(1, "a"), "b");
// verify that we can find it via a non-blocking scan
numopen = TestGetTickerCount(options, NO_FILE_OPENS);
cache_added = TestGetTickerCount(options, BLOCK_CACHE_ADD);
iter = db_->NewIterator(non_blocking_opts, handles_[1]);
count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_OK(iter->status());
count++;
}
ASSERT_EQ(count, 1);
ASSERT_EQ(numopen, TestGetTickerCount(options, NO_FILE_OPENS));
ASSERT_EQ(cache_added, TestGetTickerCount(options, BLOCK_CACHE_ADD));
delete iter;
// This test verifies block cache behaviors, which is not used by plain
// table format.
// Exclude kHashCuckoo as it does not support iteration currently
} while (ChangeOptions(kSkipPlainTable | kSkipNoSeekToLast | kSkipHashCuckoo |
kSkipMmapReads));
}
#endif // ROCKSDB_LITE
TEST_F(DBIteratorTest, IterSeekBeforePrev) {
ASSERT_OK(Put("a", "b"));
ASSERT_OK(Put("c", "d"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("0", "f"));
ASSERT_OK(Put("1", "h"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("2", "j"));
auto iter = db_->NewIterator(ReadOptions());
iter->Seek(Slice("c"));
iter->Prev();
iter->Seek(Slice("a"));
iter->Prev();
delete iter;
}
TEST_F(DBIteratorTest, IterSeekForPrevBeforeNext) {
ASSERT_OK(Put("a", "b"));
ASSERT_OK(Put("c", "d"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("0", "f"));
ASSERT_OK(Put("1", "h"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("2", "j"));
auto iter = db_->NewIterator(ReadOptions());
iter->SeekForPrev(Slice("0"));
iter->Next();
iter->SeekForPrev(Slice("1"));
iter->Next();
delete iter;
}
namespace {
std::string MakeLongKey(size_t length, char c) {
return std::string(length, c);
}
} // namespace
TEST_F(DBIteratorTest, IterLongKeys) {
ASSERT_OK(Put(MakeLongKey(20, 0), "0"));
ASSERT_OK(Put(MakeLongKey(32, 2), "2"));
ASSERT_OK(Put("a", "b"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put(MakeLongKey(50, 1), "1"));
ASSERT_OK(Put(MakeLongKey(127, 3), "3"));
ASSERT_OK(Put(MakeLongKey(64, 4), "4"));
auto iter = db_->NewIterator(ReadOptions());
// Create a key that needs to be skipped for Seq too new
iter->Seek(MakeLongKey(20, 0));
ASSERT_EQ(IterStatus(iter), MakeLongKey(20, 0) + "->0");
iter->Next();
ASSERT_EQ(IterStatus(iter), MakeLongKey(50, 1) + "->1");
iter->Next();
ASSERT_EQ(IterStatus(iter), MakeLongKey(32, 2) + "->2");
iter->Next();
ASSERT_EQ(IterStatus(iter), MakeLongKey(127, 3) + "->3");
iter->Next();
ASSERT_EQ(IterStatus(iter), MakeLongKey(64, 4) + "->4");
iter->SeekForPrev(MakeLongKey(127, 3));
ASSERT_EQ(IterStatus(iter), MakeLongKey(127, 3) + "->3");
iter->Prev();
ASSERT_EQ(IterStatus(iter), MakeLongKey(32, 2) + "->2");
iter->Prev();
ASSERT_EQ(IterStatus(iter), MakeLongKey(50, 1) + "->1");
delete iter;
iter = db_->NewIterator(ReadOptions());
iter->Seek(MakeLongKey(50, 1));
ASSERT_EQ(IterStatus(iter), MakeLongKey(50, 1) + "->1");
iter->Next();
ASSERT_EQ(IterStatus(iter), MakeLongKey(32, 2) + "->2");
iter->Next();
ASSERT_EQ(IterStatus(iter), MakeLongKey(127, 3) + "->3");
delete iter;
}
TEST_F(DBIteratorTest, IterNextWithNewerSeq) {
ASSERT_OK(Put("0", "0"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("a", "b"));
ASSERT_OK(Put("c", "d"));
ASSERT_OK(Put("d", "e"));
auto iter = db_->NewIterator(ReadOptions());
// Create a key that needs to be skipped for Seq too new
for (uint64_t i = 0; i < last_options_.max_sequential_skip_in_iterations + 1;
i++) {
ASSERT_OK(Put("b", "f"));
}
iter->Seek(Slice("a"));
ASSERT_EQ(IterStatus(iter), "a->b");
iter->Next();
ASSERT_EQ(IterStatus(iter), "c->d");
iter->SeekForPrev(Slice("b"));
ASSERT_EQ(IterStatus(iter), "a->b");
iter->Next();
ASSERT_EQ(IterStatus(iter), "c->d");
delete iter;
}
TEST_F(DBIteratorTest, IterPrevWithNewerSeq) {
ASSERT_OK(Put("0", "0"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("a", "b"));
ASSERT_OK(Put("c", "d"));
ASSERT_OK(Put("d", "e"));
auto iter = db_->NewIterator(ReadOptions());
// Create a key that needs to be skipped for Seq too new
for (uint64_t i = 0; i < last_options_.max_sequential_skip_in_iterations + 1;
i++) {
ASSERT_OK(Put("b", "f"));
}
iter->Seek(Slice("d"));
ASSERT_EQ(IterStatus(iter), "d->e");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "c->d");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "a->b");
iter->Prev();
iter->SeekForPrev(Slice("d"));
ASSERT_EQ(IterStatus(iter), "d->e");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "c->d");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "a->b");
iter->Prev();
delete iter;
}
TEST_F(DBIteratorTest, IterPrevWithNewerSeq2) {
ASSERT_OK(Put("0", "0"));
dbfull()->Flush(FlushOptions());
ASSERT_OK(Put("a", "b"));
ASSERT_OK(Put("c", "d"));
ASSERT_OK(Put("e", "f"));
auto iter = db_->NewIterator(ReadOptions());
auto iter2 = db_->NewIterator(ReadOptions());
iter->Seek(Slice("c"));
iter2->SeekForPrev(Slice("d"));
ASSERT_EQ(IterStatus(iter), "c->d");
ASSERT_EQ(IterStatus(iter2), "c->d");
// Create a key that needs to be skipped for Seq too new
for (uint64_t i = 0; i < last_options_.max_sequential_skip_in_iterations + 1;
i++) {
ASSERT_OK(Put("b", "f"));
}
iter->Prev();
ASSERT_EQ(IterStatus(iter), "a->b");
iter->Prev();
iter2->Prev();
ASSERT_EQ(IterStatus(iter2), "a->b");
iter2->Prev();
delete iter;
delete iter2;
}
TEST_F(DBIteratorTest, IterEmpty) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->Seek("foo");
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekForPrev("foo");
ASSERT_EQ(IterStatus(iter), "(invalid)");
delete iter;
} while (ChangeCompactOptions());
}
TEST_F(DBIteratorTest, IterSingle) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "a", "va"));
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->Seek("");
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekForPrev("");
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->Seek("a");
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekForPrev("a");
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->Seek("b");
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekForPrev("b");
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
delete iter;
} while (ChangeCompactOptions());
}
TEST_F(DBIteratorTest, IterMulti) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "a", "va"));
ASSERT_OK(Put(1, "b", "vb"));
ASSERT_OK(Put(1, "c", "vc"));
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->Next();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->Seek("");
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Seek("a");
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Seek("ax");
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->SeekForPrev("d");
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->SeekForPrev("c");
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->SeekForPrev("bx");
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->Seek("b");
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->Seek("z");
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekForPrev("b");
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->SeekForPrev("");
ASSERT_EQ(IterStatus(iter), "(invalid)");
// Switch from reverse to forward
iter->SeekToLast();
iter->Prev();
iter->Prev();
iter->Next();
ASSERT_EQ(IterStatus(iter), "b->vb");
// Switch from forward to reverse
iter->SeekToFirst();
iter->Next();
iter->Next();
iter->Prev();
ASSERT_EQ(IterStatus(iter), "b->vb");
// Make sure iter stays at snapshot
ASSERT_OK(Put(1, "a", "va2"));
ASSERT_OK(Put(1, "a2", "va3"));
ASSERT_OK(Put(1, "b", "vb2"));
ASSERT_OK(Put(1, "c", "vc2"));
ASSERT_OK(Delete(1, "b"));
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->Next();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "b->vb");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
delete iter;
} while (ChangeCompactOptions());
}
// Check that we can skip over a run of user keys
// by using reseek rather than sequential scan
TEST_F(DBIteratorTest, IterReseek) {
anon::OptionsOverride options_override;
options_override.skip_policy = kSkipNoSnapshot;
Options options = CurrentOptions(options_override);
options.max_sequential_skip_in_iterations = 3;
options.create_if_missing = true;
options.statistics = rocksdb::CreateDBStatistics();
DestroyAndReopen(options);
CreateAndReopenWithCF({"pikachu"}, options);
// insert three keys with same userkey and verify that
// reseek is not invoked. For each of these test cases,
// verify that we can find the next key "b".
ASSERT_OK(Put(1, "a", "zero"));
ASSERT_OK(Put(1, "a", "one"));
ASSERT_OK(Put(1, "a", "two"));
ASSERT_OK(Put(1, "b", "bone"));
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 0);
ASSERT_EQ(IterStatus(iter), "a->two");
iter->Next();
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 0);
ASSERT_EQ(IterStatus(iter), "b->bone");
delete iter;
// insert a total of three keys with same userkey and verify
// that reseek is still not invoked.
ASSERT_OK(Put(1, "a", "three"));
iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->three");
iter->Next();
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 0);
ASSERT_EQ(IterStatus(iter), "b->bone");
delete iter;
// insert a total of four keys with same userkey and verify
// that reseek is invoked.
ASSERT_OK(Put(1, "a", "four"));
iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->four");
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 0);
iter->Next();
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 1);
ASSERT_EQ(IterStatus(iter), "b->bone");
delete iter;
// Testing reverse iterator
// At this point, we have three versions of "a" and one version of "b".
// The reseek statistics is already at 1.
int num_reseeks = static_cast<int>(
TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION));
// Insert another version of b and assert that reseek is not invoked
ASSERT_OK(Put(1, "b", "btwo"));
iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "b->btwo");
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION),
num_reseeks);
iter->Prev();
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION),
num_reseeks + 1);
ASSERT_EQ(IterStatus(iter), "a->four");
delete iter;
// insert two more versions of b. This makes a total of 4 versions
// of b and 4 versions of a.
ASSERT_OK(Put(1, "b", "bthree"));
ASSERT_OK(Put(1, "b", "bfour"));
iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "b->bfour");
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION),
num_reseeks + 2);
iter->Prev();
// the previous Prev call should have invoked reseek
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION),
num_reseeks + 3);
ASSERT_EQ(IterStatus(iter), "a->four");
delete iter;
}
TEST_F(DBIteratorTest, IterSmallAndLargeMix) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "a", "va"));
ASSERT_OK(Put(1, "b", std::string(100000, 'b')));
ASSERT_OK(Put(1, "c", "vc"));
ASSERT_OK(Put(1, "d", std::string(100000, 'd')));
ASSERT_OK(Put(1, "e", std::string(100000, 'e')));
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->SeekToFirst();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Next();
ASSERT_EQ(IterStatus(iter), "b->" + std::string(100000, 'b'));
iter->Next();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Next();
ASSERT_EQ(IterStatus(iter), "d->" + std::string(100000, 'd'));
iter->Next();
ASSERT_EQ(IterStatus(iter), "e->" + std::string(100000, 'e'));
iter->Next();
ASSERT_EQ(IterStatus(iter), "(invalid)");
iter->SeekToLast();
ASSERT_EQ(IterStatus(iter), "e->" + std::string(100000, 'e'));
iter->Prev();
ASSERT_EQ(IterStatus(iter), "d->" + std::string(100000, 'd'));
iter->Prev();
ASSERT_EQ(IterStatus(iter), "c->vc");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "b->" + std::string(100000, 'b'));
iter->Prev();
ASSERT_EQ(IterStatus(iter), "a->va");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "(invalid)");
delete iter;
} while (ChangeCompactOptions());
}
TEST_F(DBIteratorTest, IterMultiWithDelete) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "ka", "va"));
ASSERT_OK(Put(1, "kb", "vb"));
ASSERT_OK(Put(1, "kc", "vc"));
ASSERT_OK(Delete(1, "kb"));
ASSERT_EQ("NOT_FOUND", Get(1, "kb"));
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
iter->Seek("kc");
ASSERT_EQ(IterStatus(iter), "kc->vc");
if (!CurrentOptions().merge_operator) {
// TODO: merge operator does not support backward iteration yet
if (kPlainTableAllBytesPrefix != option_config_ &&
kBlockBasedTableWithWholeKeyHashIndex != option_config_ &&
kHashLinkList != option_config_ &&
kHashSkipList != option_config_) { // doesn't support SeekToLast
iter->Prev();
ASSERT_EQ(IterStatus(iter), "ka->va");
}
}
delete iter;
} while (ChangeOptions());
}
TEST_F(DBIteratorTest, IterPrevMaxSkip) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
for (int i = 0; i < 2; i++) {
ASSERT_OK(Put(1, "key1", "v1"));
ASSERT_OK(Put(1, "key2", "v2"));
ASSERT_OK(Put(1, "key3", "v3"));
ASSERT_OK(Put(1, "key4", "v4"));
ASSERT_OK(Put(1, "key5", "v5"));
}
VerifyIterLast("key5->v5", 1);
ASSERT_OK(Delete(1, "key5"));
VerifyIterLast("key4->v4", 1);
ASSERT_OK(Delete(1, "key4"));
VerifyIterLast("key3->v3", 1);
ASSERT_OK(Delete(1, "key3"));
VerifyIterLast("key2->v2", 1);
ASSERT_OK(Delete(1, "key2"));
VerifyIterLast("key1->v1", 1);
ASSERT_OK(Delete(1, "key1"));
VerifyIterLast("(invalid)", 1);
} while (ChangeOptions(kSkipMergePut | kSkipNoSeekToLast));
}
TEST_F(DBIteratorTest, IterWithSnapshot) {
anon::OptionsOverride options_override;
options_override.skip_policy = kSkipNoSnapshot;
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions(options_override));
ASSERT_OK(Put(1, "key1", "val1"));
ASSERT_OK(Put(1, "key2", "val2"));
ASSERT_OK(Put(1, "key3", "val3"));
ASSERT_OK(Put(1, "key4", "val4"));
ASSERT_OK(Put(1, "key5", "val5"));
const Snapshot* snapshot = db_->GetSnapshot();
ReadOptions options;
options.snapshot = snapshot;
Iterator* iter = db_->NewIterator(options, handles_[1]);
ASSERT_OK(Put(1, "key0", "val0"));
// Put more values after the snapshot
ASSERT_OK(Put(1, "key100", "val100"));
ASSERT_OK(Put(1, "key101", "val101"));
iter->Seek("key5");
ASSERT_EQ(IterStatus(iter), "key5->val5");
if (!CurrentOptions().merge_operator) {
// TODO: merge operator does not support backward iteration yet
if (kPlainTableAllBytesPrefix != option_config_ &&
kBlockBasedTableWithWholeKeyHashIndex != option_config_ &&
kHashLinkList != option_config_ && kHashSkipList != option_config_) {
iter->Prev();
ASSERT_EQ(IterStatus(iter), "key4->val4");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "key3->val3");
iter->Next();
ASSERT_EQ(IterStatus(iter), "key4->val4");
iter->Next();
ASSERT_EQ(IterStatus(iter), "key5->val5");
}
iter->Next();
ASSERT_TRUE(!iter->Valid());
}
if (!CurrentOptions().merge_operator) {
// TODO(gzh): merge operator does not support backward iteration yet
if (kPlainTableAllBytesPrefix != option_config_ &&
kBlockBasedTableWithWholeKeyHashIndex != option_config_ &&
kHashLinkList != option_config_ && kHashSkipList != option_config_) {
iter->SeekForPrev("key1");
ASSERT_EQ(IterStatus(iter), "key1->val1");
iter->Next();
ASSERT_EQ(IterStatus(iter), "key2->val2");
iter->Next();
ASSERT_EQ(IterStatus(iter), "key3->val3");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "key2->val2");
iter->Prev();
ASSERT_EQ(IterStatus(iter), "key1->val1");
iter->Prev();
ASSERT_TRUE(!iter->Valid());
}
}
db_->ReleaseSnapshot(snapshot);
delete iter;
// skip as HashCuckooRep does not support snapshot
} while (ChangeOptions(kSkipHashCuckoo));
}
TEST_F(DBIteratorTest, IteratorPinsRef) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
Put(1, "foo", "hello");
// Get iterator that will yield the current contents of the DB.
Iterator* iter = db_->NewIterator(ReadOptions(), handles_[1]);
// Write to force compactions
Put(1, "foo", "newvalue1");
for (int i = 0; i < 100; i++) {
// 100K values
ASSERT_OK(Put(1, Key(i), Key(i) + std::string(100000, 'v')));
}
Put(1, "foo", "newvalue2");
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("foo", iter->key().ToString());
ASSERT_EQ("hello", iter->value().ToString());
iter->Next();
ASSERT_TRUE(!iter->Valid());
delete iter;
} while (ChangeCompactOptions());
}
TEST_F(DBIteratorTest, DBIteratorBoundTest) {
Options options = CurrentOptions();
options.env = env_;
options.create_if_missing = true;
options.prefix_extractor = nullptr;
DestroyAndReopen(options);
ASSERT_OK(Put("a", "0"));
ASSERT_OK(Put("foo", "bar"));
ASSERT_OK(Put("foo1", "bar1"));
ASSERT_OK(Put("g1", "0"));
// testing basic case with no iterate_upper_bound and no prefix_extractor
{
ReadOptions ro;
ro.iterate_upper_bound = nullptr;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
iter->Seek("foo");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo")), 0);
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo1")), 0);
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("g1")), 0);
iter->SeekForPrev("g1");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("g1")), 0);
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo1")), 0);
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo")), 0);
}
// testing iterate_upper_bound and forward iterator
// to make sure it stops at bound
{
ReadOptions ro;
// iterate_upper_bound points beyond the last expected entry
Slice prefix("foo2");
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
iter->Seek("foo");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo")), 0);
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(("foo1")), 0);
iter->Next();
// should stop here...
ASSERT_TRUE(!iter->Valid());
}
// Testing SeekToLast with iterate_upper_bound set
{
ReadOptions ro;
Slice prefix("foo");
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
iter->SeekToLast();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("a")), 0);
}
// prefix is the first letter of the key
options.prefix_extractor.reset(NewFixedPrefixTransform(1));
DestroyAndReopen(options);
ASSERT_OK(Put("a", "0"));
ASSERT_OK(Put("foo", "bar"));
ASSERT_OK(Put("foo1", "bar1"));
ASSERT_OK(Put("g1", "0"));
// testing with iterate_upper_bound and prefix_extractor
// Seek target and iterate_upper_bound are not is same prefix
// This should be an error
{
ReadOptions ro;
Slice upper_bound("g");
ro.iterate_upper_bound = &upper_bound;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
iter->Seek("foo");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("foo", iter->key().ToString());
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("foo1", iter->key().ToString());
iter->Next();
ASSERT_TRUE(!iter->Valid());
}
// testing that iterate_upper_bound prevents iterating over deleted items
// if the bound has already reached
{
options.prefix_extractor = nullptr;
DestroyAndReopen(options);
ASSERT_OK(Put("a", "0"));
ASSERT_OK(Put("b", "0"));
ASSERT_OK(Put("b1", "0"));
ASSERT_OK(Put("c", "0"));
ASSERT_OK(Put("d", "0"));
ASSERT_OK(Put("e", "0"));
ASSERT_OK(Delete("c"));
ASSERT_OK(Delete("d"));
// base case with no bound
ReadOptions ro;
ro.iterate_upper_bound = nullptr;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
iter->Seek("b");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("b")), 0);
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(("b1")), 0);
get_perf_context()->Reset();
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(static_cast<int>(get_perf_context()->internal_delete_skipped_count), 2);
// now testing with iterate_bound
Slice prefix("c");
ro.iterate_upper_bound = &prefix;
iter.reset(db_->NewIterator(ro));
get_perf_context()->Reset();
iter->Seek("b");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("b")), 0);
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(("b1")), 0);
iter->Next();
// the iteration should stop as soon as the bound key is reached
// even though the key is deleted
// hence internal_delete_skipped_count should be 0
ASSERT_TRUE(!iter->Valid());
ASSERT_EQ(static_cast<int>(get_perf_context()->internal_delete_skipped_count), 0);
}
}
TEST_F(DBIteratorTest, DBIteratorBoundOptimizationTest) {
int upper_bound_hits = 0;
Options options = CurrentOptions();
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"BlockBasedTable::BlockEntryIteratorState::KeyReachedUpperBound",
[&upper_bound_hits](void* arg) {
assert(arg != nullptr);
upper_bound_hits += (*static_cast<bool*>(arg) ? 1 : 0);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
options.env = env_;
options.create_if_missing = true;
options.prefix_extractor = nullptr;
BlockBasedTableOptions table_options;
table_options.flush_block_policy_factory =
std::make_shared<FlushBlockEveryKeyPolicyFactory>();
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
DestroyAndReopen(options);
ASSERT_OK(Put("foo1", "bar1"));
ASSERT_OK(Put("foo2", "bar2"));
ASSERT_OK(Put("foo4", "bar4"));
ASSERT_OK(Flush());
Slice ub("foo3");
ReadOptions ro;
ro.iterate_upper_bound = &ub;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
iter->Seek("foo");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo1")), 0);
ASSERT_EQ(upper_bound_hits, 0);
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(Slice("foo2")), 0);
ASSERT_EQ(upper_bound_hits, 0);
iter->Next();
ASSERT_FALSE(iter->Valid());
ASSERT_EQ(upper_bound_hits, 1);
}
// TODO(3.13): fix the issue of Seek() + Prev() which might not necessary
// return the biggest key which is smaller than the seek key.
TEST_F(DBIteratorTest, PrevAfterAndNextAfterMerge) {
Options options;
options.create_if_missing = true;
options.merge_operator = MergeOperators::CreatePutOperator();
options.env = env_;
DestroyAndReopen(options);
// write three entries with different keys using Merge()
WriteOptions wopts;
db_->Merge(wopts, "1", "data1");
db_->Merge(wopts, "2", "data2");
db_->Merge(wopts, "3", "data3");
std::unique_ptr<Iterator> it(db_->NewIterator(ReadOptions()));
it->Seek("2");
ASSERT_TRUE(it->Valid());
ASSERT_EQ("2", it->key().ToString());
it->Prev();
ASSERT_TRUE(it->Valid());
ASSERT_EQ("1", it->key().ToString());
it->SeekForPrev("1");
ASSERT_TRUE(it->Valid());
ASSERT_EQ("1", it->key().ToString());
it->Next();
ASSERT_TRUE(it->Valid());
ASSERT_EQ("2", it->key().ToString());
}
TEST_F(DBIteratorTest, PinnedDataIteratorRandomized) {
enum TestConfig {
NORMAL,
CLOSE_AND_OPEN,
COMPACT_BEFORE_READ,
FLUSH_EVERY_1000,
MAX
};
// Generate Random data
Random rnd(301);
int puts = 100000;
int key_pool = static_cast<int>(puts * 0.7);
int key_size = 100;
int val_size = 1000;
int seeks_percentage = 20; // 20% of keys will be used to test seek()
int delete_percentage = 20; // 20% of keys will be deleted
int merge_percentage = 20; // 20% of keys will be added using Merge()
for (int run_config = 0; run_config < TestConfig::MAX; run_config++) {
Options options = CurrentOptions();
BlockBasedTableOptions table_options;
table_options.use_delta_encoding = false;
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
options.merge_operator = MergeOperators::CreatePutOperator();
DestroyAndReopen(options);
std::vector<std::string> generated_keys(key_pool);
for (int i = 0; i < key_pool; i++) {
generated_keys[i] = RandomString(&rnd, key_size);
}
std::map<std::string, std::string> true_data;
std::vector<std::string> random_keys;
std::vector<std::string> deleted_keys;
for (int i = 0; i < puts; i++) {
auto& k = generated_keys[rnd.Next() % key_pool];
auto v = RandomString(&rnd, val_size);
// Insert data to true_data map and to DB
true_data[k] = v;
if (rnd.OneIn(static_cast<int>(100.0 / merge_percentage))) {
ASSERT_OK(db_->Merge(WriteOptions(), k, v));
} else {
ASSERT_OK(Put(k, v));
}
// Pick random keys to be used to test Seek()
if (rnd.OneIn(static_cast<int>(100.0 / seeks_percentage))) {
random_keys.push_back(k);
}
// Delete some random keys
if (rnd.OneIn(static_cast<int>(100.0 / delete_percentage))) {
deleted_keys.push_back(k);
true_data.erase(k);
ASSERT_OK(Delete(k));
}
if (run_config == TestConfig::FLUSH_EVERY_1000) {
if (i && i % 1000 == 0) {
Flush();
}
}
}
if (run_config == TestConfig::CLOSE_AND_OPEN) {
Close();
Reopen(options);
} else if (run_config == TestConfig::COMPACT_BEFORE_READ) {
db_->CompactRange(CompactRangeOptions(), nullptr, nullptr);
}
ReadOptions ro;
ro.pin_data = true;
auto iter = db_->NewIterator(ro);
{
// Test Seek to random keys
std::vector<Slice> keys_slices;
std::vector<std::string> true_keys;
for (auto& k : random_keys) {
iter->Seek(k);
if (!iter->Valid()) {
ASSERT_EQ(true_data.lower_bound(k), true_data.end());
continue;
}
std::string prop_value;
ASSERT_OK(
iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
keys_slices.push_back(iter->key());
true_keys.push_back(true_data.lower_bound(k)->first);
}
for (size_t i = 0; i < keys_slices.size(); i++) {
ASSERT_EQ(keys_slices[i].ToString(), true_keys[i]);
}
}
{
// Test SeekForPrev to random keys
std::vector<Slice> keys_slices;
std::vector<std::string> true_keys;
for (auto& k : random_keys) {
iter->SeekForPrev(k);
if (!iter->Valid()) {
ASSERT_EQ(true_data.upper_bound(k), true_data.begin());
continue;
}
std::string prop_value;
ASSERT_OK(
iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
keys_slices.push_back(iter->key());
true_keys.push_back((--true_data.upper_bound(k))->first);
}
for (size_t i = 0; i < keys_slices.size(); i++) {
ASSERT_EQ(keys_slices[i].ToString(), true_keys[i]);
}
}
{
// Test iterating all data forward
std::vector<Slice> all_keys;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
std::string prop_value;
ASSERT_OK(
iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
all_keys.push_back(iter->key());
}
ASSERT_EQ(all_keys.size(), true_data.size());
// Verify that all keys slices are valid
auto data_iter = true_data.begin();
for (size_t i = 0; i < all_keys.size(); i++) {
ASSERT_EQ(all_keys[i].ToString(), data_iter->first);
data_iter++;
}
}
{
// Test iterating all data backward
std::vector<Slice> all_keys;
for (iter->SeekToLast(); iter->Valid(); iter->Prev()) {
std::string prop_value;
ASSERT_OK(
iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
all_keys.push_back(iter->key());
}
ASSERT_EQ(all_keys.size(), true_data.size());
// Verify that all keys slices are valid (backward)
auto data_iter = true_data.rbegin();
for (size_t i = 0; i < all_keys.size(); i++) {
ASSERT_EQ(all_keys[i].ToString(), data_iter->first);
data_iter++;
}
}
delete iter;
}
}
#ifndef ROCKSDB_LITE
TEST_F(DBIteratorTest, PinnedDataIteratorMultipleFiles) {
Options options = CurrentOptions();
BlockBasedTableOptions table_options;
table_options.use_delta_encoding = false;
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
options.disable_auto_compactions = true;
options.write_buffer_size = 1024 * 1024 * 10; // 10 Mb
DestroyAndReopen(options);
std::map<std::string, std::string> true_data;
// Generate 4 sst files in L2
Random rnd(301);
for (int i = 1; i <= 1000; i++) {
std::string k = Key(i * 3);
std::string v = RandomString(&rnd, 100);
ASSERT_OK(Put(k, v));
true_data[k] = v;
if (i % 250 == 0) {
ASSERT_OK(Flush());
}
}
ASSERT_EQ(FilesPerLevel(0), "4");
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
ASSERT_EQ(FilesPerLevel(0), "0,4");
// Generate 4 sst files in L0
for (int i = 1; i <= 1000; i++) {
std::string k = Key(i * 2);
std::string v = RandomString(&rnd, 100);
ASSERT_OK(Put(k, v));
true_data[k] = v;
if (i % 250 == 0) {
ASSERT_OK(Flush());
}
}
ASSERT_EQ(FilesPerLevel(0), "4,4");
// Add some keys/values in memtables
for (int i = 1; i <= 1000; i++) {
std::string k = Key(i);
std::string v = RandomString(&rnd, 100);
ASSERT_OK(Put(k, v));
true_data[k] = v;
}
ASSERT_EQ(FilesPerLevel(0), "4,4");
ReadOptions ro;
ro.pin_data = true;
auto iter = db_->NewIterator(ro);
std::vector<std::pair<Slice, std::string>> results;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
std::string prop_value;
ASSERT_OK(iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
results.emplace_back(iter->key(), iter->value().ToString());
}
ASSERT_EQ(results.size(), true_data.size());
auto data_iter = true_data.begin();
for (size_t i = 0; i < results.size(); i++, data_iter++) {
auto& kv = results[i];
ASSERT_EQ(kv.first, data_iter->first);
ASSERT_EQ(kv.second, data_iter->second);
}
delete iter;
}
#endif
TEST_F(DBIteratorTest, PinnedDataIteratorMergeOperator) {
Options options = CurrentOptions();
BlockBasedTableOptions table_options;
table_options.use_delta_encoding = false;
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
options.merge_operator = MergeOperators::CreateUInt64AddOperator();
DestroyAndReopen(options);
std::string numbers[7];
for (int val = 0; val <= 6; val++) {
PutFixed64(numbers + val, val);
}
// +1 all keys in range [ 0 => 999]
for (int i = 0; i < 1000; i++) {
WriteOptions wo;
ASSERT_OK(db_->Merge(wo, Key(i), numbers[1]));
}
// +2 all keys divisible by 2 in range [ 0 => 999]
for (int i = 0; i < 1000; i += 2) {
WriteOptions wo;
ASSERT_OK(db_->Merge(wo, Key(i), numbers[2]));
}
// +3 all keys divisible by 5 in range [ 0 => 999]
for (int i = 0; i < 1000; i += 5) {
WriteOptions wo;
ASSERT_OK(db_->Merge(wo, Key(i), numbers[3]));
}
ReadOptions ro;
ro.pin_data = true;
auto iter = db_->NewIterator(ro);
std::vector<std::pair<Slice, std::string>> results;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
std::string prop_value;
ASSERT_OK(iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
results.emplace_back(iter->key(), iter->value().ToString());
}
ASSERT_EQ(results.size(), 1000);
for (size_t i = 0; i < results.size(); i++) {
auto& kv = results[i];
ASSERT_EQ(kv.first, Key(static_cast<int>(i)));
int expected_val = 1;
if (i % 2 == 0) {
expected_val += 2;
}
if (i % 5 == 0) {
expected_val += 3;
}
ASSERT_EQ(kv.second, numbers[expected_val]);
}
delete iter;
}
TEST_F(DBIteratorTest, PinnedDataIteratorReadAfterUpdate) {
Options options = CurrentOptions();
BlockBasedTableOptions table_options;
table_options.use_delta_encoding = false;
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
options.write_buffer_size = 100000;
DestroyAndReopen(options);
Random rnd(301);
std::map<std::string, std::string> true_data;
for (int i = 0; i < 1000; i++) {
std::string k = RandomString(&rnd, 10);
std::string v = RandomString(&rnd, 1000);
ASSERT_OK(Put(k, v));
true_data[k] = v;
}
ReadOptions ro;
ro.pin_data = true;
auto iter = db_->NewIterator(ro);
// Delete 50% of the keys and update the other 50%
for (auto& kv : true_data) {
if (rnd.OneIn(2)) {
ASSERT_OK(Delete(kv.first));
} else {
std::string new_val = RandomString(&rnd, 1000);
ASSERT_OK(Put(kv.first, new_val));
}
}
std::vector<std::pair<Slice, std::string>> results;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
std::string prop_value;
ASSERT_OK(iter->GetProperty("rocksdb.iterator.is-key-pinned", &prop_value));
ASSERT_EQ("1", prop_value);
results.emplace_back(iter->key(), iter->value().ToString());
}
auto data_iter = true_data.begin();
for (size_t i = 0; i < results.size(); i++, data_iter++) {
auto& kv = results[i];
ASSERT_EQ(kv.first, data_iter->first);
ASSERT_EQ(kv.second, data_iter->second);
}
delete iter;
}
TEST_F(DBIteratorTest, IterSeekForPrevCrossingFiles) {
Options options = CurrentOptions();
options.prefix_extractor.reset(NewFixedPrefixTransform(1));
options.disable_auto_compactions = true;
// Enable prefix bloom for SST files
BlockBasedTableOptions table_options;
table_options.filter_policy.reset(NewBloomFilterPolicy(10, true));
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
DestroyAndReopen(options);
ASSERT_OK(Put("a1", "va1"));
ASSERT_OK(Put("a2", "va2"));
ASSERT_OK(Put("a3", "va3"));
ASSERT_OK(Flush());
ASSERT_OK(Put("b1", "vb1"));
ASSERT_OK(Put("b2", "vb2"));
ASSERT_OK(Put("b3", "vb3"));
ASSERT_OK(Flush());
ASSERT_OK(Put("b4", "vb4"));
ASSERT_OK(Put("d1", "vd1"));
ASSERT_OK(Put("d2", "vd2"));
ASSERT_OK(Put("d4", "vd4"));
ASSERT_OK(Flush());
MoveFilesToLevel(1);
{
ReadOptions ro;
Iterator* iter = db_->NewIterator(ro);
iter->SeekForPrev("a4");
ASSERT_EQ(iter->key().ToString(), "a3");
ASSERT_EQ(iter->value().ToString(), "va3");
iter->SeekForPrev("c2");
ASSERT_EQ(iter->key().ToString(), "b3");
iter->SeekForPrev("d3");
ASSERT_EQ(iter->key().ToString(), "d2");
iter->SeekForPrev("b5");
ASSERT_EQ(iter->key().ToString(), "b4");
delete iter;
}
{
ReadOptions ro;
ro.prefix_same_as_start = true;
Iterator* iter = db_->NewIterator(ro);
iter->SeekForPrev("c2");
ASSERT_TRUE(!iter->Valid());
delete iter;
}
}
TEST_F(DBIteratorTest, IterPrevKeyCrossingBlocks) {
Options options = CurrentOptions();
BlockBasedTableOptions table_options;
table_options.block_size = 1; // every block will contain one entry
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
options.merge_operator = MergeOperators::CreateStringAppendTESTOperator();
options.disable_auto_compactions = true;
options.max_sequential_skip_in_iterations = 8;
DestroyAndReopen(options);
// Putting such deletes will force DBIter::Prev() to fallback to a Seek
for (int file_num = 0; file_num < 10; file_num++) {
ASSERT_OK(Delete("key4"));
ASSERT_OK(Flush());
}
// First File containing 5 blocks of puts
ASSERT_OK(Put("key1", "val1.0"));
ASSERT_OK(Put("key2", "val2.0"));
ASSERT_OK(Put("key3", "val3.0"));
ASSERT_OK(Put("key4", "val4.0"));
ASSERT_OK(Put("key5", "val5.0"));
ASSERT_OK(Flush());
// Second file containing 9 blocks of merge operands
ASSERT_OK(db_->Merge(WriteOptions(), "key1", "val1.1"));
ASSERT_OK(db_->Merge(WriteOptions(), "key1", "val1.2"));
ASSERT_OK(db_->Merge(WriteOptions(), "key2", "val2.1"));
ASSERT_OK(db_->Merge(WriteOptions(), "key2", "val2.2"));
ASSERT_OK(db_->Merge(WriteOptions(), "key2", "val2.3"));
ASSERT_OK(db_->Merge(WriteOptions(), "key3", "val3.1"));
ASSERT_OK(db_->Merge(WriteOptions(), "key3", "val3.2"));
ASSERT_OK(db_->Merge(WriteOptions(), "key3", "val3.3"));
ASSERT_OK(db_->Merge(WriteOptions(), "key3", "val3.4"));
ASSERT_OK(Flush());
{
ReadOptions ro;
ro.fill_cache = false;
Iterator* iter = db_->NewIterator(ro);
iter->SeekToLast();
ASSERT_EQ(iter->key().ToString(), "key5");
ASSERT_EQ(iter->value().ToString(), "val5.0");
iter->Prev();
ASSERT_EQ(iter->key().ToString(), "key4");
ASSERT_EQ(iter->value().ToString(), "val4.0");
iter->Prev();
ASSERT_EQ(iter->key().ToString(), "key3");
ASSERT_EQ(iter->value().ToString(), "val3.0,val3.1,val3.2,val3.3,val3.4");
iter->Prev();
ASSERT_EQ(iter->key().ToString(), "key2");
ASSERT_EQ(iter->value().ToString(), "val2.0,val2.1,val2.2,val2.3");
iter->Prev();
ASSERT_EQ(iter->key().ToString(), "key1");
ASSERT_EQ(iter->value().ToString(), "val1.0,val1.1,val1.2");
delete iter;
}
}
TEST_F(DBIteratorTest, IterPrevKeyCrossingBlocksRandomized) {
Options options = CurrentOptions();
options.merge_operator = MergeOperators::CreateStringAppendTESTOperator();
options.disable_auto_compactions = true;
options.level0_slowdown_writes_trigger = (1 << 30);
options.level0_stop_writes_trigger = (1 << 30);
options.max_sequential_skip_in_iterations = 8;
DestroyAndReopen(options);
const int kNumKeys = 500;
// Small number of merge operands to make sure that DBIter::Prev() dont
// fall back to Seek()
const int kNumMergeOperands = 3;
// Use value size that will make sure that every block contain 1 key
const int kValSize =
static_cast<int>(BlockBasedTableOptions().block_size) * 4;
// Percentage of keys that wont get merge operations
const int kNoMergeOpPercentage = 20;
// Percentage of keys that will be deleted
const int kDeletePercentage = 10;
// For half of the key range we will write multiple deletes first to
// force DBIter::Prev() to fall back to Seek()
for (int file_num = 0; file_num < 10; file_num++) {
for (int i = 0; i < kNumKeys; i += 2) {
ASSERT_OK(Delete(Key(i)));
}
ASSERT_OK(Flush());
}
Random rnd(301);
std::map<std::string, std::string> true_data;
std::string gen_key;
std::string gen_val;
for (int i = 0; i < kNumKeys; i++) {
gen_key = Key(i);
gen_val = RandomString(&rnd, kValSize);
ASSERT_OK(Put(gen_key, gen_val));
true_data[gen_key] = gen_val;
}
ASSERT_OK(Flush());
// Separate values and merge operands in different file so that we
// make sure that we dont merge them while flushing but actually
// merge them in the read path
for (int i = 0; i < kNumKeys; i++) {
if (rnd.OneIn(static_cast<int>(100.0 / kNoMergeOpPercentage))) {
// Dont give merge operations for some keys
continue;
}
for (int j = 0; j < kNumMergeOperands; j++) {
gen_key = Key(i);
gen_val = RandomString(&rnd, kValSize);
ASSERT_OK(db_->Merge(WriteOptions(), gen_key, gen_val));
true_data[gen_key] += "," + gen_val;
}
}
ASSERT_OK(Flush());
for (int i = 0; i < kNumKeys; i++) {
if (rnd.OneIn(static_cast<int>(100.0 / kDeletePercentage))) {
gen_key = Key(i);
ASSERT_OK(Delete(gen_key));
true_data.erase(gen_key);
}
}
ASSERT_OK(Flush());
{
ReadOptions ro;
ro.fill_cache = false;
Iterator* iter = db_->NewIterator(ro);
auto data_iter = true_data.rbegin();
for (iter->SeekToLast(); iter->Valid(); iter->Prev()) {
ASSERT_EQ(iter->key().ToString(), data_iter->first);
ASSERT_EQ(iter->value().ToString(), data_iter->second);
data_iter++;
}
ASSERT_EQ(data_iter, true_data.rend());
delete iter;
}
{
ReadOptions ro;
ro.fill_cache = false;
Iterator* iter = db_->NewIterator(ro);
auto data_iter = true_data.rbegin();
int entries_right = 0;
std::string seek_key;
for (iter->SeekToLast(); iter->Valid(); iter->Prev()) {
// Verify key/value of current position
ASSERT_EQ(iter->key().ToString(), data_iter->first);
ASSERT_EQ(iter->value().ToString(), data_iter->second);
bool restore_position_with_seek = rnd.Uniform(2);
if (restore_position_with_seek) {
seek_key = iter->key().ToString();
}
// Do some Next() operations the restore the iterator to orignal position
int next_count =
entries_right > 0 ? rnd.Uniform(std::min(entries_right, 10)) : 0;
for (int i = 0; i < next_count; i++) {
iter->Next();
data_iter--;
ASSERT_EQ(iter->key().ToString(), data_iter->first);
ASSERT_EQ(iter->value().ToString(), data_iter->second);
}
if (restore_position_with_seek) {
// Restore orignal position using Seek()
iter->Seek(seek_key);
for (int i = 0; i < next_count; i++) {
data_iter++;
}
ASSERT_EQ(iter->key().ToString(), data_iter->first);
ASSERT_EQ(iter->value().ToString(), data_iter->second);
} else {
// Restore original position using Prev()
for (int i = 0; i < next_count; i++) {
iter->Prev();
data_iter++;
ASSERT_EQ(iter->key().ToString(), data_iter->first);
ASSERT_EQ(iter->value().ToString(), data_iter->second);
}
}
entries_right++;
data_iter++;
}
ASSERT_EQ(data_iter, true_data.rend());
delete iter;
}
}
TEST_F(DBIteratorTest, IteratorWithLocalStatistics) {
Options options = CurrentOptions();
options.statistics = rocksdb::CreateDBStatistics();
DestroyAndReopen(options);
Random rnd(301);
for (int i = 0; i < 1000; i++) {
// Key 10 bytes / Value 10 bytes
ASSERT_OK(Put(RandomString(&rnd, 10), RandomString(&rnd, 10)));
}
std::atomic<uint64_t> total_next(0);
std::atomic<uint64_t> total_next_found(0);
std::atomic<uint64_t> total_prev(0);
std::atomic<uint64_t> total_prev_found(0);
std::atomic<uint64_t> total_bytes(0);
std::vector<port::Thread> threads;
std::function<void()> reader_func_next = [&]() {
Iterator* iter = db_->NewIterator(ReadOptions());
iter->SeekToFirst();
// Seek will bump ITER_BYTES_READ
total_bytes += iter->key().size();
total_bytes += iter->value().size();
while (true) {
iter->Next();
total_next++;
if (!iter->Valid()) {
break;
}
total_next_found++;
total_bytes += iter->key().size();
total_bytes += iter->value().size();
}
delete iter;
};
std::function<void()> reader_func_prev = [&]() {
Iterator* iter = db_->NewIterator(ReadOptions());
iter->SeekToLast();
// Seek will bump ITER_BYTES_READ
total_bytes += iter->key().size();
total_bytes += iter->value().size();
while (true) {
iter->Prev();
total_prev++;
if (!iter->Valid()) {
break;
}
total_prev_found++;
total_bytes += iter->key().size();
total_bytes += iter->value().size();
}
delete iter;
};
for (int i = 0; i < 10; i++) {
threads.emplace_back(reader_func_next);
}
for (int i = 0; i < 15; i++) {
threads.emplace_back(reader_func_prev);
}
for (auto& t : threads) {
t.join();
}
ASSERT_EQ(TestGetTickerCount(options, NUMBER_DB_NEXT), (uint64_t)total_next);
ASSERT_EQ(TestGetTickerCount(options, NUMBER_DB_NEXT_FOUND),
(uint64_t)total_next_found);
ASSERT_EQ(TestGetTickerCount(options, NUMBER_DB_PREV), (uint64_t)total_prev);
ASSERT_EQ(TestGetTickerCount(options, NUMBER_DB_PREV_FOUND),
(uint64_t)total_prev_found);
ASSERT_EQ(TestGetTickerCount(options, ITER_BYTES_READ), (uint64_t)total_bytes);
}
TEST_F(DBIteratorTest, ReadAhead) {
Options options;
env_->count_random_reads_ = true;
options.env = env_;
options.disable_auto_compactions = true;
options.write_buffer_size = 4 << 20;
options.statistics = rocksdb::CreateDBStatistics();
BlockBasedTableOptions table_options;
table_options.block_size = 1024;
table_options.no_block_cache = true;
options.table_factory.reset(new BlockBasedTableFactory(table_options));
Reopen(options);
std::string value(1024, 'a');
for (int i = 0; i < 100; i++) {
Put(Key(i), value);
}
ASSERT_OK(Flush());
MoveFilesToLevel(2);
for (int i = 0; i < 100; i++) {
Put(Key(i), value);
}
ASSERT_OK(Flush());
MoveFilesToLevel(1);
for (int i = 0; i < 100; i++) {
Put(Key(i), value);
}
ASSERT_OK(Flush());
#ifndef ROCKSDB_LITE
ASSERT_EQ("1,1,1", FilesPerLevel());
#endif // !ROCKSDB_LITE
env_->random_read_bytes_counter_ = 0;
options.statistics->setTickerCount(NO_FILE_OPENS, 0);
ReadOptions read_options;
auto* iter = db_->NewIterator(read_options);
iter->SeekToFirst();
int64_t num_file_opens = TestGetTickerCount(options, NO_FILE_OPENS);
size_t bytes_read = env_->random_read_bytes_counter_;
delete iter;
env_->random_read_bytes_counter_ = 0;
options.statistics->setTickerCount(NO_FILE_OPENS, 0);
read_options.readahead_size = 1024 * 10;
iter = db_->NewIterator(read_options);
iter->SeekToFirst();
int64_t num_file_opens_readahead = TestGetTickerCount(options, NO_FILE_OPENS);
size_t bytes_read_readahead = env_->random_read_bytes_counter_;
delete iter;
ASSERT_EQ(num_file_opens + 3, num_file_opens_readahead);
ASSERT_GT(bytes_read_readahead, bytes_read);
ASSERT_GT(bytes_read_readahead, read_options.readahead_size * 3);
// Verify correctness.
iter = db_->NewIterator(read_options);
int count = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_EQ(value, iter->value());
count++;
}
ASSERT_EQ(100, count);
for (int i = 0; i < 100; i++) {
iter->Seek(Key(i));
ASSERT_EQ(value, iter->value());
}
delete iter;
}
// Insert a key, create a snapshot iterator, overwrite key lots of times,
// seek to a smaller key. Expect DBIter to fall back to a seek instead of
// going through all the overwrites linearly.
TEST_F(DBIteratorTest, DBIteratorSkipRecentDuplicatesTest) {
Options options = CurrentOptions();
options.env = env_;
options.create_if_missing = true;
options.max_sequential_skip_in_iterations = 3;
options.prefix_extractor = nullptr;
options.write_buffer_size = 1 << 27; // big enough to avoid flush
options.statistics = rocksdb::CreateDBStatistics();
DestroyAndReopen(options);
// Insert.
ASSERT_OK(Put("b", "0"));
// Create iterator.
ReadOptions ro;
std::unique_ptr<Iterator> iter(db_->NewIterator(ro));
// Insert a lot.
for (int i = 0; i < 100; ++i) {
ASSERT_OK(Put("b", std::to_string(i + 1).c_str()));
}
#ifndef ROCKSDB_LITE
// Check that memtable wasn't flushed.
std::string val;
ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level0", &val));
EXPECT_EQ("0", val);
#endif
// Seek iterator to a smaller key.
get_perf_context()->Reset();
iter->Seek("a");
ASSERT_TRUE(iter->Valid());
EXPECT_EQ("b", iter->key().ToString());
EXPECT_EQ("0", iter->value().ToString());
// Check that the seek didn't do too much work.
// Checks are not tight, just make sure that everything is well below 100.
EXPECT_LT(get_perf_context()->internal_key_skipped_count, 4);
EXPECT_LT(get_perf_context()->internal_recent_skipped_count, 8);
EXPECT_LT(get_perf_context()->seek_on_memtable_count, 10);
EXPECT_LT(get_perf_context()->next_on_memtable_count, 10);
EXPECT_LT(get_perf_context()->prev_on_memtable_count, 10);
// Check that iterator did something like what we expect.
EXPECT_EQ(get_perf_context()->internal_delete_skipped_count, 0);
EXPECT_EQ(get_perf_context()->internal_merge_count, 0);
EXPECT_GE(get_perf_context()->internal_recent_skipped_count, 2);
EXPECT_GE(get_perf_context()->seek_on_memtable_count, 2);
EXPECT_EQ(1, options.statistics->getTickerCount(
NUMBER_OF_RESEEKS_IN_ITERATION));
}
} // namespace rocksdb
int main(int argc, char** argv) {
rocksdb::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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