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rocksdb/db/db_tailing_iter_test.cc
Aaron Gao b50a81a2bb Add a test for tailing_iterator 
Summary:
A bug that tailingIterator->Seek(target) skips records.

I think the bug is in the SeekInternal starting at lines 387:
search_left_bound > search_right_bound
There are only 2 cases this can happen:
(1) target key is smaller than left most file
(2) target key is larger than right most file

The comment is wrong, there is another possibility that at the higher level there is a big gap such that the file in the lower level fits completely in the gap and then
indexer->GetNextLevelIndex returns search_left_bound > search_right_bound I think pointing on the files after and before the gap.
details: https://github.com/facebook/rocksdb/issues/1372

fixed this bug with test case added.
Closes https://github.com/facebook/rocksdb/pull/1436

Reviewed By: IslamAbdelRahman

Differential Revision: D4099313

Pulled By: lightmark

fbshipit-source-id: 6a675b3
2016-10-28 18:24:14 -07:00

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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.
//
// 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.
// Introduction of SyncPoint effectively disabled building and running this test
// in Release build.
// which is a pity, it is a good test
#if !defined(ROCKSDB_LITE)
#include "db/db_test_util.h"
#include "db/forward_iterator.h"
#include "port/stack_trace.h"
namespace rocksdb {
class DBTestTailingIterator : public DBTestBase {
public:
DBTestTailingIterator() : DBTestBase("/db_tailing_iterator_test") {}
};
TEST_F(DBTestTailingIterator, TailingIteratorSingle) {
ReadOptions read_options;
read_options.tailing = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->SeekToFirst();
ASSERT_TRUE(!iter->Valid());
// add a record and check that iter can see it
ASSERT_OK(db_->Put(WriteOptions(), "mirko", "fodor"));
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), "mirko");
iter->Next();
ASSERT_TRUE(!iter->Valid());
}
TEST_F(DBTestTailingIterator, TailingIteratorKeepAdding) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
std::string value(1024, 'a');
const int num_records = 10000;
for (int i = 0; i < num_records; ++i) {
char buf[32];
snprintf(buf, sizeof(buf), "%016d", i);
Slice key(buf, 16);
ASSERT_OK(Put(1, key, value));
iter->Seek(key);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
}
}
TEST_F(DBTestTailingIterator, TailingIteratorSeekToNext) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
std::unique_ptr<Iterator> itern(db_->NewIterator(read_options, handles_[1]));
std::string value(1024, 'a');
const int num_records = 1000;
for (int i = 1; i < num_records; ++i) {
char buf1[32];
char buf2[32];
snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
Slice key(buf1, 20);
ASSERT_OK(Put(1, key, value));
if (i % 100 == 99) {
ASSERT_OK(Flush(1));
}
snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
Slice target(buf2, 20);
iter->Seek(target);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
if (i == 1) {
itern->SeekToFirst();
} else {
itern->Next();
}
ASSERT_TRUE(itern->Valid());
ASSERT_EQ(itern->key().compare(key), 0);
}
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
for (int i = 2 * num_records; i > 0; --i) {
char buf1[32];
char buf2[32];
snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
Slice key(buf1, 20);
ASSERT_OK(Put(1, key, value));
if (i % 100 == 99) {
ASSERT_OK(Flush(1));
}
snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
Slice target(buf2, 20);
iter->Seek(target);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
}
}
TEST_F(DBTestTailingIterator, TailingIteratorTrimSeekToNext) {
const uint64_t k150KB = 150 * 1024;
Options options;
options.write_buffer_size = k150KB;
options.max_write_buffer_number = 3;
options.min_write_buffer_number_to_merge = 2;
CreateAndReopenWithCF({"pikachu"}, options);
ReadOptions read_options;
read_options.tailing = true;
int num_iters, deleted_iters;
char bufe[32];
snprintf(bufe, sizeof(bufe), "00b0%016d", 0);
Slice keyu(bufe, 20);
read_options.iterate_upper_bound = &keyu;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
std::unique_ptr<Iterator> itern(db_->NewIterator(read_options, handles_[1]));
std::unique_ptr<Iterator> iterh(db_->NewIterator(read_options, handles_[1]));
std::string value(1024, 'a');
bool file_iters_deleted = false;
bool file_iters_renewed_null = false;
bool file_iters_renewed_copy = false;
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"ForwardIterator::SeekInternal:Return", [&](void* arg) {
ForwardIterator* fiter = reinterpret_cast<ForwardIterator*>(arg);
ASSERT_TRUE(!file_iters_deleted ||
fiter->TEST_CheckDeletedIters(&deleted_iters, &num_iters));
});
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"ForwardIterator::Next:Return", [&](void* arg) {
ForwardIterator* fiter = reinterpret_cast<ForwardIterator*>(arg);
ASSERT_TRUE(!file_iters_deleted ||
fiter->TEST_CheckDeletedIters(&deleted_iters, &num_iters));
});
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"ForwardIterator::RenewIterators:Null",
[&](void* arg) { file_iters_renewed_null = true; });
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"ForwardIterator::RenewIterators:Copy",
[&](void* arg) { file_iters_renewed_copy = true; });
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
const int num_records = 1000;
for (int i = 1; i < num_records; ++i) {
char buf1[32];
char buf2[32];
char buf3[32];
char buf4[32];
snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
snprintf(buf3, sizeof(buf3), "00b0%016d", i * 5);
Slice key(buf1, 20);
ASSERT_OK(Put(1, key, value));
Slice keyn(buf3, 20);
ASSERT_OK(Put(1, keyn, value));
if (i % 100 == 99) {
ASSERT_OK(Flush(1));
dbfull()->TEST_WaitForCompact();
if (i == 299) {
file_iters_deleted = true;
}
snprintf(buf4, sizeof(buf4), "00a0%016d", i * 5 / 2);
Slice target(buf4, 20);
iterh->Seek(target);
ASSERT_TRUE(iter->Valid());
for (int j = (i + 1) * 5 / 2; j < i * 5; j += 5) {
iterh->Next();
ASSERT_TRUE(iterh->Valid());
}
if (i == 299) {
file_iters_deleted = false;
}
}
file_iters_deleted = true;
snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
Slice target(buf2, 20);
iter->Seek(target);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
ASSERT_LE(num_iters, 1);
if (i == 1) {
itern->SeekToFirst();
} else {
itern->Next();
}
ASSERT_TRUE(itern->Valid());
ASSERT_EQ(itern->key().compare(key), 0);
ASSERT_LE(num_iters, 1);
file_iters_deleted = false;
}
ASSERT_TRUE(file_iters_renewed_null);
ASSERT_TRUE(file_iters_renewed_copy);
iter = 0;
itern = 0;
iterh = 0;
BlockBasedTableOptions table_options;
table_options.no_block_cache = true;
table_options.block_cache_compressed = nullptr;
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
ReopenWithColumnFamilies({"default", "pikachu"}, options);
read_options.read_tier = kBlockCacheTier;
std::unique_ptr<Iterator> iteri(db_->NewIterator(read_options, handles_[1]));
char buf5[32];
snprintf(buf5, sizeof(buf5), "00a0%016d", (num_records / 2) * 5 - 2);
Slice target1(buf5, 20);
iteri->Seek(target1);
ASSERT_TRUE(iteri->status().IsIncomplete());
iteri = 0;
read_options.read_tier = kReadAllTier;
options.table_factory.reset(NewBlockBasedTableFactory());
ReopenWithColumnFamilies({"default", "pikachu"}, options);
iter.reset(db_->NewIterator(read_options, handles_[1]));
for (int i = 2 * num_records; i > 0; --i) {
char buf1[32];
char buf2[32];
snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
Slice key(buf1, 20);
ASSERT_OK(Put(1, key, value));
if (i % 100 == 99) {
ASSERT_OK(Flush(1));
}
snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
Slice target(buf2, 20);
iter->Seek(target);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
}
}
TEST_F(DBTestTailingIterator, TailingIteratorDeletes) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
// write a single record, read it using the iterator, then delete it
ASSERT_OK(Put(1, "0test", "test"));
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), "0test");
ASSERT_OK(Delete(1, "0test"));
// write many more records
const int num_records = 10000;
std::string value(1024, 'A');
for (int i = 0; i < num_records; ++i) {
char buf[32];
snprintf(buf, sizeof(buf), "1%015d", i);
Slice key(buf, 16);
ASSERT_OK(Put(1, key, value));
}
// force a flush to make sure that no records are read from memtable
ASSERT_OK(Flush(1));
// skip "0test"
iter->Next();
// make sure we can read all new records using the existing iterator
int count = 0;
for (; iter->Valid(); iter->Next(), ++count) ;
ASSERT_EQ(count, num_records);
}
TEST_F(DBTestTailingIterator, TailingIteratorPrefixSeek) {
XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip,
kSkipNoPrefix);
ReadOptions read_options;
read_options.tailing = true;
Options options = CurrentOptions();
options.env = env_;
options.create_if_missing = true;
options.disable_auto_compactions = true;
options.prefix_extractor.reset(NewFixedPrefixTransform(2));
options.memtable_factory.reset(NewHashSkipListRepFactory(16));
DestroyAndReopen(options);
CreateAndReopenWithCF({"pikachu"}, options);
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
ASSERT_OK(Put(1, "0101", "test"));
ASSERT_OK(Flush(1));
ASSERT_OK(Put(1, "0202", "test"));
// Seek(0102) shouldn't find any records since 0202 has a different prefix
iter->Seek("0102");
ASSERT_TRUE(!iter->Valid());
iter->Seek("0202");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), "0202");
iter->Next();
ASSERT_TRUE(!iter->Valid());
XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip, 0);
}
TEST_F(DBTestTailingIterator, TailingIteratorIncomplete) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
read_options.read_tier = kBlockCacheTier;
std::string key("key");
std::string value("value");
ASSERT_OK(db_->Put(WriteOptions(), key, value));
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->SeekToFirst();
// we either see the entry or it's not in cache
ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
iter->SeekToFirst();
// should still be true after compaction
ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
}
TEST_F(DBTestTailingIterator, TailingIteratorSeekToSame) {
Options options = CurrentOptions();
options.compaction_style = kCompactionStyleUniversal;
options.write_buffer_size = 1000;
CreateAndReopenWithCF({"pikachu"}, options);
ReadOptions read_options;
read_options.tailing = true;
const int NROWS = 10000;
// Write rows with keys 00000, 00002, 00004 etc.
for (int i = 0; i < NROWS; ++i) {
char buf[100];
snprintf(buf, sizeof(buf), "%05d", 2*i);
std::string key(buf);
std::string value("value");
ASSERT_OK(db_->Put(WriteOptions(), key, value));
}
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
// Seek to 00001. We expect to find 00002.
std::string start_key = "00001";
iter->Seek(start_key);
ASSERT_TRUE(iter->Valid());
std::string found = iter->key().ToString();
ASSERT_EQ("00002", found);
// Now seek to the same key. The iterator should remain in the same
// position.
iter->Seek(found);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(found, iter->key().ToString());
}
// Sets iterate_upper_bound and verifies that ForwardIterator doesn't call
// Seek() on immutable iterators when target key is >= prev_key and all
// iterators, including the memtable iterator, are over the upper bound.
TEST_F(DBTestTailingIterator, TailingIteratorUpperBound) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
const Slice upper_bound("20", 3);
ReadOptions read_options;
read_options.tailing = true;
read_options.iterate_upper_bound = &upper_bound;
ASSERT_OK(Put(1, "11", "11"));
ASSERT_OK(Put(1, "12", "12"));
ASSERT_OK(Put(1, "22", "22"));
ASSERT_OK(Flush(1)); // flush all those keys to an immutable SST file
// Add another key to the memtable.
ASSERT_OK(Put(1, "21", "21"));
std::unique_ptr<Iterator> it(db_->NewIterator(read_options, handles_[1]));
it->Seek("12");
ASSERT_TRUE(it->Valid());
ASSERT_EQ("12", it->key().ToString());
it->Next();
// Not valid since "21" is over the upper bound.
ASSERT_FALSE(it->Valid());
// This keeps track of the number of times NeedToSeekImmutable() was true.
int immutable_seeks = 0;
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"ForwardIterator::SeekInternal:Immutable",
[&](void* arg) { ++immutable_seeks; });
// Seek to 13. This should not require any immutable seeks.
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
it->Seek("13");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
ASSERT_FALSE(it->Valid());
ASSERT_EQ(0, immutable_seeks);
}
TEST_F(DBTestTailingIterator, TailingIteratorGap) {
// level 1: [20, 25] [35, 40]
// level 2: [10 - 15] [45 - 50]
// level 3: [20, 30, 40]
// Previously there is a bug in tailing_iterator that if there is a gap in
// lower level, the key will be skipped if it is within the range between
// the largest key of index n file and the smallest key of index n+1 file
// if both file fit in that gap. In this example, 25 < key < 35
// https://github.com/facebook/rocksdb/issues/1372
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
ASSERT_OK(Put(1, "20", "20"));
ASSERT_OK(Put(1, "30", "30"));
ASSERT_OK(Put(1, "40", "40"));
ASSERT_OK(Flush(1));
MoveFilesToLevel(3, 1);
ASSERT_OK(Put(1, "10", "10"));
ASSERT_OK(Put(1, "15", "15"));
ASSERT_OK(Flush(1));
ASSERT_OK(Put(1, "45", "45"));
ASSERT_OK(Put(1, "50", "50"));
ASSERT_OK(Flush(1));
MoveFilesToLevel(2, 1);
ASSERT_OK(Put(1, "20", "20"));
ASSERT_OK(Put(1, "25", "25"));
ASSERT_OK(Flush(1));
ASSERT_OK(Put(1, "35", "35"));
ASSERT_OK(Put(1, "40", "40"));
ASSERT_OK(Flush(1));
MoveFilesToLevel(1, 1);
ColumnFamilyMetaData meta;
db_->GetColumnFamilyMetaData(handles_[1], &meta);
std::unique_ptr<Iterator> it(db_->NewIterator(read_options, handles_[1]));
it->Seek("30");
ASSERT_TRUE(it->Valid());
ASSERT_EQ("30", it->key().ToString());
it->Next();
ASSERT_TRUE(it->Valid());
ASSERT_EQ("35", it->key().ToString());
it->Next();
ASSERT_TRUE(it->Valid());
ASSERT_EQ("40", it->key().ToString());
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorSingle) {
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->SeekToFirst();
ASSERT_TRUE(!iter->Valid());
// add a record and check that iter can see it
ASSERT_OK(db_->Put(WriteOptions(), "mirko", "fodor"));
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), "mirko");
iter->Next();
ASSERT_TRUE(!iter->Valid());
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorKeepAdding) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
std::string value(1024, 'a');
const int num_records = 10000;
for (int i = 0; i < num_records; ++i) {
char buf[32];
snprintf(buf, sizeof(buf), "%016d", i);
Slice key(buf, 16);
ASSERT_OK(Put(1, key, value));
iter->Seek(key);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
}
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorSeekToNext) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
std::string value(1024, 'a');
const int num_records = 1000;
for (int i = 1; i < num_records; ++i) {
char buf1[32];
char buf2[32];
snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
Slice key(buf1, 20);
ASSERT_OK(Put(1, key, value));
if (i % 100 == 99) {
ASSERT_OK(Flush(1));
}
snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
Slice target(buf2, 20);
iter->Seek(target);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
}
for (int i = 2 * num_records; i > 0; --i) {
char buf1[32];
char buf2[32];
snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
Slice key(buf1, 20);
ASSERT_OK(Put(1, key, value));
if (i % 100 == 99) {
ASSERT_OK(Flush(1));
}
snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
Slice target(buf2, 20);
iter->Seek(target);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().compare(key), 0);
}
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorDeletes) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
// write a single record, read it using the iterator, then delete it
ASSERT_OK(Put(1, "0test", "test"));
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), "0test");
ASSERT_OK(Delete(1, "0test"));
// write many more records
const int num_records = 10000;
std::string value(1024, 'A');
for (int i = 0; i < num_records; ++i) {
char buf[32];
snprintf(buf, sizeof(buf), "1%015d", i);
Slice key(buf, 16);
ASSERT_OK(Put(1, key, value));
}
// force a flush to make sure that no records are read from memtable
ASSERT_OK(Flush(1));
// skip "0test"
iter->Next();
// make sure we can read all new records using the existing iterator
int count = 0;
for (; iter->Valid(); iter->Next(), ++count) {
}
ASSERT_EQ(count, num_records);
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorPrefixSeek) {
XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip,
kSkipNoPrefix);
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
Options options = CurrentOptions();
options.env = env_;
options.create_if_missing = true;
options.disable_auto_compactions = true;
options.prefix_extractor.reset(NewFixedPrefixTransform(2));
options.memtable_factory.reset(NewHashSkipListRepFactory(16));
DestroyAndReopen(options);
CreateAndReopenWithCF({"pikachu"}, options);
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
ASSERT_OK(Put(1, "0101", "test"));
ASSERT_OK(Flush(1));
ASSERT_OK(Put(1, "0202", "test"));
// Seek(0102) shouldn't find any records since 0202 has a different prefix
iter->Seek("0102");
ASSERT_TRUE(!iter->Valid());
iter->Seek("0202");
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->key().ToString(), "0202");
iter->Next();
ASSERT_TRUE(!iter->Valid());
XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip, 0);
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorIncomplete) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
read_options.read_tier = kBlockCacheTier;
std::string key = "key";
std::string value = "value";
ASSERT_OK(db_->Put(WriteOptions(), key, value));
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->SeekToFirst();
// we either see the entry or it's not in cache
ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
iter->SeekToFirst();
// should still be true after compaction
ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
}
TEST_F(DBTestTailingIterator, ManagedTailingIteratorSeekToSame) {
Options options = CurrentOptions();
options.compaction_style = kCompactionStyleUniversal;
options.write_buffer_size = 1000;
CreateAndReopenWithCF({"pikachu"}, options);
ReadOptions read_options;
read_options.tailing = true;
read_options.managed = true;
const int NROWS = 10000;
// Write rows with keys 00000, 00002, 00004 etc.
for (int i = 0; i < NROWS; ++i) {
char buf[100];
snprintf(buf, sizeof(buf), "%05d", 2 * i);
std::string key(buf);
std::string value("value");
ASSERT_OK(db_->Put(WriteOptions(), key, value));
}
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
// Seek to 00001. We expect to find 00002.
std::string start_key = "00001";
iter->Seek(start_key);
ASSERT_TRUE(iter->Valid());
std::string found = iter->key().ToString();
ASSERT_EQ("00002", found);
// Now seek to the same key. The iterator should remain in the same
// position.
iter->Seek(found);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(found, iter->key().ToString());
}
TEST_F(DBTestTailingIterator, ForwardIteratorVersionProperty) {
Options options = CurrentOptions();
options.write_buffer_size = 1000;
ReadOptions read_options;
read_options.tailing = true;
Put("foo", "bar");
uint64_t v1, v2, v3, v4;
{
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->Seek("foo");
std::string prop_value;
ASSERT_OK(iter->GetProperty("rocksdb.iterator.super-version-number",
&prop_value));
v1 = static_cast<uint64_t>(std::atoi(prop_value.c_str()));
Put("foo1", "bar1");
Flush();
ASSERT_OK(iter->GetProperty("rocksdb.iterator.super-version-number",
&prop_value));
v2 = static_cast<uint64_t>(std::atoi(prop_value.c_str()));
iter->Seek("f");
ASSERT_OK(iter->GetProperty("rocksdb.iterator.super-version-number",
&prop_value));
v3 = static_cast<uint64_t>(std::atoi(prop_value.c_str()));
ASSERT_EQ(v1, v2);
ASSERT_GT(v3, v2);
}
{
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->Seek("foo");
std::string prop_value;
ASSERT_OK(iter->GetProperty("rocksdb.iterator.super-version-number",
&prop_value));
v4 = static_cast<uint64_t>(std::atoi(prop_value.c_str()));
}
ASSERT_EQ(v3, v4);
}
} // namespace rocksdb
#endif // !defined(ROCKSDB_LITE)
int main(int argc, char** argv) {
#if !defined(ROCKSDB_LITE)
rocksdb::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
#else
return 0;
#endif
}
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