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rocksdb/db/db_flush_test.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <atomic>
#include "db/db_impl/db_impl.h"
#include "db/db_test_util.h"
#include "file/filename.h"
#include "port/port.h"
#include "port/stack_trace.h"
#include "rocksdb/utilities/transaction_db.h"
#include "test_util/sync_point.h"
#include "util/cast_util.h"
#include "util/mutexlock.h"
#include "utilities/fault_injection_env.h"
namespace ROCKSDB_NAMESPACE {
class DBFlushTest : public DBTestBase {
public:
DBFlushTest() : DBTestBase("/db_flush_test", /*env_do_fsync=*/true) {}
};
class DBFlushDirectIOTest : public DBFlushTest,
public ::testing::WithParamInterface<bool> {
public:
DBFlushDirectIOTest() : DBFlushTest() {}
};
class DBAtomicFlushTest : public DBFlushTest,
public ::testing::WithParamInterface<bool> {
public:
DBAtomicFlushTest() : DBFlushTest() {}
};
// We had issue when two background threads trying to flush at the same time,
// only one of them get committed. The test verifies the issue is fixed.
TEST_F(DBFlushTest, FlushWhileWritingManifest) {
Options options;
options.disable_auto_compactions = true;
options.max_background_flushes = 2;
options.env = env_;
Reopen(options);
FlushOptions no_wait;
no_wait.wait = false;
no_wait.allow_write_stall=true;
SyncPoint::GetInstance()->LoadDependency(
{{"VersionSet::LogAndApply:WriteManifest",
"DBFlushTest::FlushWhileWritingManifest:1"},
{"MemTableList::TryInstallMemtableFlushResults:InProgress",
"VersionSet::LogAndApply:WriteManifestDone"}});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put("foo", "v"));
ASSERT_OK(dbfull()->Flush(no_wait));
TEST_SYNC_POINT("DBFlushTest::FlushWhileWritingManifest:1");
ASSERT_OK(Put("bar", "v"));
ASSERT_OK(dbfull()->Flush(no_wait));
// If the issue is hit we will wait here forever.
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
#ifndef ROCKSDB_LITE
ASSERT_EQ(2, TotalTableFiles());
#endif // ROCKSDB_LITE
}
// Disable this test temporarily on Travis as it fails intermittently.
// Github issue: #4151
TEST_F(DBFlushTest, SyncFail) {
std::unique_ptr<FaultInjectionTestEnv> fault_injection_env(
new FaultInjectionTestEnv(env_));
Options options;
options.disable_auto_compactions = true;
options.env = fault_injection_env.get();
SyncPoint::GetInstance()->LoadDependency(
{{"DBFlushTest::SyncFail:GetVersionRefCount:1",
"DBImpl::FlushMemTableToOutputFile:BeforePickMemtables"},
{"DBImpl::FlushMemTableToOutputFile:AfterPickMemtables",
"DBFlushTest::SyncFail:GetVersionRefCount:2"},
{"DBFlushTest::SyncFail:1", "DBImpl::SyncClosedLogs:Start"},
{"DBImpl::SyncClosedLogs:Failed", "DBFlushTest::SyncFail:2"}});
SyncPoint::GetInstance()->EnableProcessing();
CreateAndReopenWithCF({"pikachu"}, options);
ASSERT_OK(Put("key", "value"));
auto* cfd =
static_cast_with_check<ColumnFamilyHandleImpl>(db_->DefaultColumnFamily())
->cfd();
FlushOptions flush_options;
flush_options.wait = false;
ASSERT_OK(dbfull()->Flush(flush_options));
// Flush installs a new super-version. Get the ref count after that.
auto current_before = cfd->current();
int refs_before = cfd->current()->TEST_refs();
TEST_SYNC_POINT("DBFlushTest::SyncFail:GetVersionRefCount:1");
TEST_SYNC_POINT("DBFlushTest::SyncFail:GetVersionRefCount:2");
int refs_after_picking_memtables = cfd->current()->TEST_refs();
ASSERT_EQ(refs_before + 1, refs_after_picking_memtables);
fault_injection_env->SetFilesystemActive(false);
TEST_SYNC_POINT("DBFlushTest::SyncFail:1");
TEST_SYNC_POINT("DBFlushTest::SyncFail:2");
fault_injection_env->SetFilesystemActive(true);
// Now the background job will do the flush; wait for it.
// Returns the IO error happend during flush.
ASSERT_NOK(dbfull()->TEST_WaitForFlushMemTable());
#ifndef ROCKSDB_LITE
ASSERT_EQ("", FilesPerLevel()); // flush failed.
#endif // ROCKSDB_LITE
// Backgroun flush job should release ref count to current version.
ASSERT_EQ(current_before, cfd->current());
ASSERT_EQ(refs_before, cfd->current()->TEST_refs());
Destroy(options);
}
TEST_F(DBFlushTest, SyncSkip) {
Options options = CurrentOptions();
SyncPoint::GetInstance()->LoadDependency(
{{"DBFlushTest::SyncSkip:1", "DBImpl::SyncClosedLogs:Skip"},
{"DBImpl::SyncClosedLogs:Skip", "DBFlushTest::SyncSkip:2"}});
SyncPoint::GetInstance()->EnableProcessing();
Reopen(options);
ASSERT_OK(Put("key", "value"));
FlushOptions flush_options;
flush_options.wait = false;
ASSERT_OK(dbfull()->Flush(flush_options));
TEST_SYNC_POINT("DBFlushTest::SyncSkip:1");
TEST_SYNC_POINT("DBFlushTest::SyncSkip:2");
// Now the background job will do the flush; wait for it.
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
Destroy(options);
}
TEST_F(DBFlushTest, FlushInLowPriThreadPool) {
// Verify setting an empty high-pri (flush) thread pool causes flushes to be
// scheduled in the low-pri (compaction) thread pool.
Options options = CurrentOptions();
options.level0_file_num_compaction_trigger = 4;
options.memtable_factory.reset(new SpecialSkipListFactory(1));
Reopen(options);
env_->SetBackgroundThreads(0, Env::HIGH);
std::thread::id tid;
int num_flushes = 0, num_compactions = 0;
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::BGWorkFlush", [&](void* /*arg*/) {
if (tid == std::thread::id()) {
tid = std::this_thread::get_id();
} else {
ASSERT_EQ(tid, std::this_thread::get_id());
}
++num_flushes;
});
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::BGWorkCompaction", [&](void* /*arg*/) {
ASSERT_EQ(tid, std::this_thread::get_id());
++num_compactions;
});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put("key", "val"));
for (int i = 0; i < 4; ++i) {
ASSERT_OK(Put("key", "val"));
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable());
}
ASSERT_OK(dbfull()->TEST_WaitForCompact());
ASSERT_EQ(4, num_flushes);
ASSERT_EQ(1, num_compactions);
}
TEST_F(DBFlushTest, ManualFlushWithMinWriteBufferNumberToMerge) {
Options options = CurrentOptions();
options.write_buffer_size = 100;
options.max_write_buffer_number = 4;
options.min_write_buffer_number_to_merge = 3;
Reopen(options);
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::BGWorkFlush",
"DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:1"},
{"DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:2",
"FlushJob::WriteLevel0Table"}});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put("key1", "value1"));
port::Thread t([&]() {
// The call wait for flush to finish, i.e. with flush_options.wait = true.
ASSERT_OK(Flush());
});
// Wait for flush start.
TEST_SYNC_POINT("DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:1");
// Insert a second memtable before the manual flush finish.
// At the end of the manual flush job, it will check if further flush
// is needed, but it will not trigger flush of the second memtable because
// min_write_buffer_number_to_merge is not reached.
ASSERT_OK(Put("key2", "value2"));
ASSERT_OK(dbfull()->TEST_SwitchMemtable());
TEST_SYNC_POINT("DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:2");
// Manual flush should return, without waiting for flush indefinitely.
t.join();
}
TEST_F(DBFlushTest, ScheduleOnlyOneBgThread) {
Options options = CurrentOptions();
Reopen(options);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
int called = 0;
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::MaybeScheduleFlushOrCompaction:AfterSchedule:0", [&](void* arg) {
ASSERT_NE(nullptr, arg);
auto unscheduled_flushes = *reinterpret_cast<int*>(arg);
ASSERT_EQ(0, unscheduled_flushes);
++called;
});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put("a", "foo"));
FlushOptions flush_opts;
ASSERT_OK(dbfull()->Flush(flush_opts));
ASSERT_EQ(1, called);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
TEST_P(DBFlushDirectIOTest, DirectIO) {
Options options;
options.create_if_missing = true;
options.disable_auto_compactions = true;
options.max_background_flushes = 2;
options.use_direct_io_for_flush_and_compaction = GetParam();
options.env = new MockEnv(Env::Default());
SyncPoint::GetInstance()->SetCallBack(
"BuildTable:create_file", [&](void* arg) {
bool* use_direct_writes = static_cast<bool*>(arg);
ASSERT_EQ(*use_direct_writes,
options.use_direct_io_for_flush_and_compaction);
});
SyncPoint::GetInstance()->EnableProcessing();
Reopen(options);
ASSERT_OK(Put("foo", "v"));
FlushOptions flush_options;
flush_options.wait = true;
ASSERT_OK(dbfull()->Flush(flush_options));
Destroy(options);
delete options.env;
}
TEST_F(DBFlushTest, FlushError) {
Options options;
std::unique_ptr<FaultInjectionTestEnv> fault_injection_env(
new FaultInjectionTestEnv(env_));
options.write_buffer_size = 100;
options.max_write_buffer_number = 4;
options.min_write_buffer_number_to_merge = 3;
options.disable_auto_compactions = true;
options.env = fault_injection_env.get();
Reopen(options);
ASSERT_OK(Put("key1", "value1"));
ASSERT_OK(Put("key2", "value2"));
fault_injection_env->SetFilesystemActive(false);
Status s = dbfull()->TEST_SwitchMemtable();
fault_injection_env->SetFilesystemActive(true);
Destroy(options);
ASSERT_NE(s, Status::OK());
}
TEST_F(DBFlushTest, ManualFlushFailsInReadOnlyMode) {
// Regression test for bug where manual flush hangs forever when the DB
// is in read-only mode. Verify it now at least returns, despite failing.
Options options;
std::unique_ptr<FaultInjectionTestEnv> fault_injection_env(
new FaultInjectionTestEnv(env_));
options.env = fault_injection_env.get();
options.max_write_buffer_number = 2;
Reopen(options);
// Trigger a first flush but don't let it run
ASSERT_OK(db_->PauseBackgroundWork());
ASSERT_OK(Put("key1", "value1"));
FlushOptions flush_opts;
flush_opts.wait = false;
ASSERT_OK(db_->Flush(flush_opts));
// Write a key to the second memtable so we have something to flush later
// after the DB is in read-only mode.
ASSERT_OK(Put("key2", "value2"));
// Let the first flush continue, hit an error, and put the DB in read-only
// mode.
fault_injection_env->SetFilesystemActive(false);
ASSERT_OK(db_->ContinueBackgroundWork());
// We ingested the error to env, so the returned status is not OK.
ASSERT_NOK(dbfull()->TEST_WaitForFlushMemTable());
#ifndef ROCKSDB_LITE
uint64_t num_bg_errors;
ASSERT_TRUE(db_->GetIntProperty(DB::Properties::kBackgroundErrors,
&num_bg_errors));
ASSERT_GT(num_bg_errors, 0);
#endif // ROCKSDB_LITE
// In the bug scenario, triggering another flush would cause the second flush
// to hang forever. After the fix we expect it to return an error.
ASSERT_NOK(db_->Flush(FlushOptions()));
Close();
}
TEST_F(DBFlushTest, CFDropRaceWithWaitForFlushMemTables) {
Options options = CurrentOptions();
options.create_if_missing = true;
CreateAndReopenWithCF({"pikachu"}, options);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::FlushMemTable:AfterScheduleFlush",
"DBFlushTest::CFDropRaceWithWaitForFlushMemTables:BeforeDrop"},
{"DBFlushTest::CFDropRaceWithWaitForFlushMemTables:AfterFree",
"DBImpl::BackgroundCallFlush:start"},
{"DBImpl::BackgroundCallFlush:start",
"DBImpl::FlushMemTable:BeforeWaitForBgFlush"}});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_EQ(2, handles_.size());
ASSERT_OK(Put(1, "key", "value"));
auto* cfd = static_cast<ColumnFamilyHandleImpl*>(handles_[1])->cfd();
port::Thread drop_cf_thr([&]() {
TEST_SYNC_POINT(
"DBFlushTest::CFDropRaceWithWaitForFlushMemTables:BeforeDrop");
ASSERT_OK(dbfull()->DropColumnFamily(handles_[1]));
ASSERT_OK(dbfull()->DestroyColumnFamilyHandle(handles_[1]));
handles_.resize(1);
TEST_SYNC_POINT(
"DBFlushTest::CFDropRaceWithWaitForFlushMemTables:AfterFree");
});
FlushOptions flush_opts;
flush_opts.allow_write_stall = true;
ASSERT_NOK(dbfull()->TEST_FlushMemTable(cfd, flush_opts));
drop_cf_thr.join();
Close();
SyncPoint::GetInstance()->DisableProcessing();
}
#ifndef ROCKSDB_LITE
TEST_F(DBFlushTest, FireOnFlushCompletedAfterCommittedResult) {
class TestListener : public EventListener {
public:
void OnFlushCompleted(DB* db, const FlushJobInfo& info) override {
// There's only one key in each flush.
ASSERT_EQ(info.smallest_seqno, info.largest_seqno);
ASSERT_NE(0, info.smallest_seqno);
if (info.smallest_seqno == seq1) {
// First flush completed
ASSERT_FALSE(completed1);
completed1 = true;
CheckFlushResultCommitted(db, seq1);
} else {
// Second flush completed
ASSERT_FALSE(completed2);
completed2 = true;
ASSERT_EQ(info.smallest_seqno, seq2);
CheckFlushResultCommitted(db, seq2);
}
}
void CheckFlushResultCommitted(DB* db, SequenceNumber seq) {
DBImpl* db_impl = static_cast_with_check<DBImpl>(db);
InstrumentedMutex* mutex = db_impl->mutex();
mutex->Lock();
auto* cfd = static_cast_with_check<ColumnFamilyHandleImpl>(
db->DefaultColumnFamily())
->cfd();
ASSERT_LT(seq, cfd->imm()->current()->GetEarliestSequenceNumber());
mutex->Unlock();
}
std::atomic<SequenceNumber> seq1{0};
std::atomic<SequenceNumber> seq2{0};
std::atomic<bool> completed1{false};
std::atomic<bool> completed2{false};
};
std::shared_ptr<TestListener> listener = std::make_shared<TestListener>();
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::BackgroundCallFlush:start",
"DBFlushTest::FireOnFlushCompletedAfterCommittedResult:WaitFirst"},
{"DBImpl::FlushMemTableToOutputFile:Finish",
"DBFlushTest::FireOnFlushCompletedAfterCommittedResult:WaitSecond"}});
SyncPoint::GetInstance()->SetCallBack(
"FlushJob::WriteLevel0Table", [&listener](void* arg) {
// Wait for the second flush finished, out of mutex.
auto* mems = reinterpret_cast<autovector<MemTable*>*>(arg);
if (mems->front()->GetEarliestSequenceNumber() == listener->seq1 - 1) {
TEST_SYNC_POINT(
"DBFlushTest::FireOnFlushCompletedAfterCommittedResult:"
"WaitSecond");
}
});
Options options = CurrentOptions();
options.create_if_missing = true;
options.listeners.push_back(listener);
// Setting max_flush_jobs = max_background_jobs / 4 = 2.
options.max_background_jobs = 8;
// Allow 2 immutable memtables.
options.max_write_buffer_number = 3;
Reopen(options);
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put("foo", "v"));
listener->seq1 = db_->GetLatestSequenceNumber();
// t1 will wait for the second flush complete before committing flush result.
auto t1 = port::Thread([&]() {
// flush_opts.wait = true
ASSERT_OK(db_->Flush(FlushOptions()));
});
// Wait for first flush started.
TEST_SYNC_POINT(
"DBFlushTest::FireOnFlushCompletedAfterCommittedResult:WaitFirst");
// The second flush will exit early without commit its result. The work
// is delegated to the first flush.
ASSERT_OK(Put("bar", "v"));
listener->seq2 = db_->GetLatestSequenceNumber();
FlushOptions flush_opts;
flush_opts.wait = false;
ASSERT_OK(db_->Flush(flush_opts));
t1.join();
ASSERT_TRUE(listener->completed1);
ASSERT_TRUE(listener->completed2);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
#endif // !ROCKSDB_LITE
TEST_F(DBFlushTest, FlushWithBlob) {
constexpr uint64_t min_blob_size = 10;
Options options;
options.env = CurrentOptions().env;
options.enable_blob_files = true;
options.min_blob_size = min_blob_size;
options.disable_auto_compactions = true;
options.env = env_;
Reopen(options);
constexpr char short_value[] = "short";
static_assert(sizeof(short_value) - 1 < min_blob_size,
"short_value too long");
constexpr char long_value[] = "long_value";
static_assert(sizeof(long_value) - 1 >= min_blob_size,
"long_value too short");
ASSERT_OK(Put("key1", short_value));
ASSERT_OK(Put("key2", long_value));
ASSERT_OK(Flush());
ASSERT_EQ(Get("key1"), short_value);
ASSERT_EQ(Get("key2"), long_value);
VersionSet* const versions = dbfull()->TEST_GetVersionSet();
assert(versions);
ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
assert(cfd);
Version* const current = cfd->current();
assert(current);
const VersionStorageInfo* const storage_info = current->storage_info();
assert(storage_info);
const auto& l0_files = storage_info->LevelFiles(0);
ASSERT_EQ(l0_files.size(), 1);
const FileMetaData* const table_file = l0_files[0];
assert(table_file);
const auto& blob_files = storage_info->GetBlobFiles();
ASSERT_EQ(blob_files.size(), 1);
const auto& blob_file = blob_files.begin()->second;
assert(blob_file);
ASSERT_EQ(table_file->smallest.user_key(), "key1");
ASSERT_EQ(table_file->largest.user_key(), "key2");
ASSERT_EQ(table_file->fd.smallest_seqno, 1);
ASSERT_EQ(table_file->fd.largest_seqno, 2);
ASSERT_EQ(table_file->oldest_blob_file_number,
blob_file->GetBlobFileNumber());
ASSERT_EQ(blob_file->GetTotalBlobCount(), 1);
#ifndef ROCKSDB_LITE
const InternalStats* const internal_stats = cfd->internal_stats();
assert(internal_stats);
const uint64_t expected_bytes =
table_file->fd.GetFileSize() + blob_file->GetTotalBlobBytes();
const auto& compaction_stats = internal_stats->TEST_GetCompactionStats();
ASSERT_FALSE(compaction_stats.empty());
ASSERT_EQ(compaction_stats[0].bytes_written, expected_bytes);
ASSERT_EQ(compaction_stats[0].num_output_files, 2);
const uint64_t* const cf_stats_value = internal_stats->TEST_GetCFStatsValue();
ASSERT_EQ(cf_stats_value[InternalStats::BYTES_FLUSHED], expected_bytes);
#endif // ROCKSDB_LITE
}
class DBFlushTestBlobError : public DBFlushTest,
public testing::WithParamInterface<std::string> {
public:
DBFlushTestBlobError()
: fault_injection_env_(env_), sync_point_(GetParam()) {}
~DBFlushTestBlobError() { Close(); }
FaultInjectionTestEnv fault_injection_env_;
std::string sync_point_;
};
INSTANTIATE_TEST_CASE_P(DBFlushTestBlobError, DBFlushTestBlobError,
::testing::ValuesIn(std::vector<std::string>{
"BlobFileBuilder::WriteBlobToFile:AddRecord",
"BlobFileBuilder::WriteBlobToFile:AppendFooter"}));
TEST_P(DBFlushTestBlobError, FlushError) {
Options options;
options.enable_blob_files = true;
options.disable_auto_compactions = true;
options.env = &fault_injection_env_;
Reopen(options);
ASSERT_OK(Put("key", "blob"));
SyncPoint::GetInstance()->SetCallBack(sync_point_, [this](void* /* arg */) {
fault_injection_env_.SetFilesystemActive(false,
Status::IOError(sync_point_));
});
SyncPoint::GetInstance()->SetCallBack(
"BuildTable:BeforeDeleteFile", [this](void* /* arg */) {
fault_injection_env_.SetFilesystemActive(true);
});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_NOK(Flush());
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
VersionSet* const versions = dbfull()->TEST_GetVersionSet();
assert(versions);
ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
assert(cfd);
Version* const current = cfd->current();
assert(current);
const VersionStorageInfo* const storage_info = current->storage_info();
assert(storage_info);
const auto& l0_files = storage_info->LevelFiles(0);
ASSERT_TRUE(l0_files.empty());
const auto& blob_files = storage_info->GetBlobFiles();
ASSERT_TRUE(blob_files.empty());
// Make sure the files generated by the failed job have been deleted
std::vector<std::string> files;
ASSERT_OK(env_->GetChildren(dbname_, &files));
for (const auto& file : files) {
uint64_t number = 0;
FileType type = kTableFile;
if (!ParseFileName(file, &number, &type)) {
continue;
}
ASSERT_NE(type, kTableFile);
ASSERT_NE(type, kBlobFile);
}
#ifndef ROCKSDB_LITE
const InternalStats* const internal_stats = cfd->internal_stats();
assert(internal_stats);
const auto& compaction_stats = internal_stats->TEST_GetCompactionStats();
ASSERT_FALSE(compaction_stats.empty());
if (sync_point_ == "BlobFileBuilder::WriteBlobToFile:AddRecord") {
ASSERT_EQ(compaction_stats[0].bytes_written, 0);
ASSERT_EQ(compaction_stats[0].num_output_files, 0);
} else {
// SST file writing succeeded; blob file writing failed (during Finish)
ASSERT_GT(compaction_stats[0].bytes_written, 0);
ASSERT_EQ(compaction_stats[0].num_output_files, 1);
}
const uint64_t* const cf_stats_value = internal_stats->TEST_GetCFStatsValue();
ASSERT_EQ(cf_stats_value[InternalStats::BYTES_FLUSHED],
compaction_stats[0].bytes_written);
#endif // ROCKSDB_LITE
}
#ifndef ROCKSDB_LITE
TEST_P(DBAtomicFlushTest, ManualFlushUnder2PC) {
Options options = CurrentOptions();
options.create_if_missing = true;
options.allow_2pc = true;
options.atomic_flush = GetParam();
// 64MB so that memtable flush won't be trigger by the small writes.
options.write_buffer_size = (static_cast<size_t>(64) << 20);
// Destroy the DB to recreate as a TransactionDB.
Close();
Destroy(options, true);
// Create a TransactionDB.
TransactionDB* txn_db = nullptr;
TransactionDBOptions txn_db_opts;
txn_db_opts.write_policy = TxnDBWritePolicy::WRITE_COMMITTED;
ASSERT_OK(TransactionDB::Open(options, txn_db_opts, dbname_, &txn_db));
ASSERT_NE(txn_db, nullptr);
db_ = txn_db;
// Create two more columns other than default CF.
std::vector<std::string> cfs = {"puppy", "kitty"};
CreateColumnFamilies(cfs, options);
ASSERT_EQ(handles_.size(), 2);
ASSERT_EQ(handles_[0]->GetName(), cfs[0]);
ASSERT_EQ(handles_[1]->GetName(), cfs[1]);
const size_t kNumCfToFlush = options.atomic_flush ? 2 : 1;
WriteOptions wopts;
TransactionOptions txn_opts;
// txn1 only prepare, but does not commit.
// The WAL containing the prepared but uncommitted data must be kept.
Transaction* txn1 = txn_db->BeginTransaction(wopts, txn_opts, nullptr);
// txn2 not only prepare, but also commit.
Transaction* txn2 = txn_db->BeginTransaction(wopts, txn_opts, nullptr);
ASSERT_NE(txn1, nullptr);
ASSERT_NE(txn2, nullptr);
for (size_t i = 0; i < kNumCfToFlush; i++) {
ASSERT_OK(txn1->Put(handles_[i], "k1", "v1"));
ASSERT_OK(txn2->Put(handles_[i], "k2", "v2"));
}
// A txn must be named before prepare.
ASSERT_OK(txn1->SetName("txn1"));
ASSERT_OK(txn2->SetName("txn2"));
// Prepare writes to WAL, but not to memtable. (WriteCommitted)
ASSERT_OK(txn1->Prepare());
ASSERT_OK(txn2->Prepare());
// Commit writes to memtable.
ASSERT_OK(txn2->Commit());
delete txn1;
delete txn2;
// There are still data in memtable not flushed.
// But since data is small enough to reside in the active memtable,
// there are no immutable memtable.
for (size_t i = 0; i < kNumCfToFlush; i++) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_FALSE(cfh->cfd()->mem()->IsEmpty());
}
// Atomic flush memtables,
// the min log with prepared data should be written to MANIFEST.
std::vector<ColumnFamilyHandle*> cfs_to_flush(kNumCfToFlush);
for (size_t i = 0; i < kNumCfToFlush; i++) {
cfs_to_flush[i] = handles_[i];
}
ASSERT_OK(txn_db->Flush(FlushOptions(), cfs_to_flush));
// There are no remaining data in memtable after flush.
for (size_t i = 0; i < kNumCfToFlush; i++) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_TRUE(cfh->cfd()->mem()->IsEmpty());
ASSERT_EQ(cfh->cfd()->GetFlushReason(), FlushReason::kManualFlush);
}
// The recovered min log number with prepared data should be non-zero.
// In 2pc mode, MinLogNumberToKeep returns the
// VersionSet::min_log_number_to_keep_2pc recovered from MANIFEST, if it's 0,
// it means atomic flush didn't write the min_log_number_to_keep to MANIFEST.
cfs.push_back(kDefaultColumnFamilyName);
ASSERT_OK(TryReopenWithColumnFamilies(cfs, options));
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db_);
ASSERT_TRUE(db_impl->allow_2pc());
ASSERT_NE(db_impl->MinLogNumberToKeep(), 0);
}
#endif // ROCKSDB_LITE
TEST_P(DBAtomicFlushTest, ManualAtomicFlush) {
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = GetParam();
options.write_buffer_size = (static_cast<size_t>(64) << 20);
CreateAndReopenWithCF({"pikachu", "eevee"}, options);
size_t num_cfs = handles_.size();
ASSERT_EQ(3, num_cfs);
WriteOptions wopts;
wopts.disableWAL = true;
for (size_t i = 0; i != num_cfs; ++i) {
ASSERT_OK(Put(static_cast<int>(i) /*cf*/, "key", "value", wopts));
}
for (size_t i = 0; i != num_cfs; ++i) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_FALSE(cfh->cfd()->mem()->IsEmpty());
}
std::vector<int> cf_ids;
for (size_t i = 0; i != num_cfs; ++i) {
cf_ids.emplace_back(static_cast<int>(i));
}
ASSERT_OK(Flush(cf_ids));
for (size_t i = 0; i != num_cfs; ++i) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(cfh->cfd()->GetFlushReason(), FlushReason::kManualFlush);
ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_TRUE(cfh->cfd()->mem()->IsEmpty());
}
}
TEST_P(DBAtomicFlushTest, PrecomputeMinLogNumberToKeepNon2PC) {
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = GetParam();
options.write_buffer_size = (static_cast<size_t>(64) << 20);
CreateAndReopenWithCF({"pikachu"}, options);
const size_t num_cfs = handles_.size();
ASSERT_EQ(num_cfs, 2);
WriteOptions wopts;
for (size_t i = 0; i != num_cfs; ++i) {
ASSERT_OK(Put(static_cast<int>(i) /*cf*/, "key", "value", wopts));
}
{
// Flush the default CF only.
std::vector<int> cf_ids{0};
ASSERT_OK(Flush(cf_ids));
autovector<ColumnFamilyData*> flushed_cfds;
autovector<autovector<VersionEdit*>> flush_edits;
auto flushed_cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[0]);
flushed_cfds.push_back(flushed_cfh->cfd());
flush_edits.push_back({});
auto unflushed_cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[1]);
ASSERT_EQ(PrecomputeMinLogNumberToKeepNon2PC(dbfull()->TEST_GetVersionSet(),
flushed_cfds, flush_edits),
unflushed_cfh->cfd()->GetLogNumber());
}
{
// Flush all CFs.
std::vector<int> cf_ids;
for (size_t i = 0; i != num_cfs; ++i) {
cf_ids.emplace_back(static_cast<int>(i));
}
ASSERT_OK(Flush(cf_ids));
uint64_t log_num_after_flush = dbfull()->TEST_GetCurrentLogNumber();
uint64_t min_log_number_to_keep = port::kMaxUint64;
autovector<ColumnFamilyData*> flushed_cfds;
autovector<autovector<VersionEdit*>> flush_edits;
for (size_t i = 0; i != num_cfs; ++i) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
flushed_cfds.push_back(cfh->cfd());
flush_edits.push_back({});
min_log_number_to_keep =
std::min(min_log_number_to_keep, cfh->cfd()->GetLogNumber());
}
ASSERT_EQ(min_log_number_to_keep, log_num_after_flush);
ASSERT_EQ(PrecomputeMinLogNumberToKeepNon2PC(dbfull()->TEST_GetVersionSet(),
flushed_cfds, flush_edits),
min_log_number_to_keep);
}
}
TEST_P(DBAtomicFlushTest, AtomicFlushTriggeredByMemTableFull) {
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = GetParam();
// 4KB so that we can easily trigger auto flush.
options.write_buffer_size = 4096;
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::BackgroundCallFlush:FlushFinish:0",
"DBAtomicFlushTest::AtomicFlushTriggeredByMemTableFull:BeforeCheck"}});
SyncPoint::GetInstance()->EnableProcessing();
CreateAndReopenWithCF({"pikachu", "eevee"}, options);
size_t num_cfs = handles_.size();
ASSERT_EQ(3, num_cfs);
WriteOptions wopts;
wopts.disableWAL = true;
for (size_t i = 0; i != num_cfs; ++i) {
ASSERT_OK(Put(static_cast<int>(i) /*cf*/, "key", "value", wopts));
}
// Keep writing to one of them column families to trigger auto flush.
for (int i = 0; i != 4000; ++i) {
ASSERT_OK(Put(static_cast<int>(num_cfs) - 1 /*cf*/,
"key" + std::to_string(i), "value" + std::to_string(i),
wopts));
}
TEST_SYNC_POINT(
"DBAtomicFlushTest::AtomicFlushTriggeredByMemTableFull:BeforeCheck");
if (options.atomic_flush) {
for (size_t i = 0; i + 1 != num_cfs; ++i) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_TRUE(cfh->cfd()->mem()->IsEmpty());
}
} else {
for (size_t i = 0; i + 1 != num_cfs; ++i) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_FALSE(cfh->cfd()->mem()->IsEmpty());
}
}
SyncPoint::GetInstance()->DisableProcessing();
}
TEST_P(DBAtomicFlushTest, AtomicFlushRollbackSomeJobs) {
bool atomic_flush = GetParam();
if (!atomic_flush) {
return;
}
std::unique_ptr<FaultInjectionTestEnv> fault_injection_env(
new FaultInjectionTestEnv(env_));
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
options.env = fault_injection_env.get();
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::AtomicFlushMemTablesToOutputFiles:SomeFlushJobsComplete:1",
"DBAtomicFlushTest::AtomicFlushRollbackSomeJobs:1"},
{"DBAtomicFlushTest::AtomicFlushRollbackSomeJobs:2",
"DBImpl::AtomicFlushMemTablesToOutputFiles:SomeFlushJobsComplete:2"}});
SyncPoint::GetInstance()->EnableProcessing();
CreateAndReopenWithCF({"pikachu", "eevee"}, options);
size_t num_cfs = handles_.size();
ASSERT_EQ(3, num_cfs);
WriteOptions wopts;
wopts.disableWAL = true;
for (size_t i = 0; i != num_cfs; ++i) {
int cf_id = static_cast<int>(i);
ASSERT_OK(Put(cf_id, "key", "value", wopts));
}
FlushOptions flush_opts;
flush_opts.wait = false;
ASSERT_OK(dbfull()->Flush(flush_opts, handles_));
TEST_SYNC_POINT("DBAtomicFlushTest::AtomicFlushRollbackSomeJobs:1");
fault_injection_env->SetFilesystemActive(false);
TEST_SYNC_POINT("DBAtomicFlushTest::AtomicFlushRollbackSomeJobs:2");
for (auto* cfh : handles_) {
// Returns the IO error happend during flush.
ASSERT_NOK(dbfull()->TEST_WaitForFlushMemTable(cfh));
}
for (size_t i = 0; i != num_cfs; ++i) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
ASSERT_EQ(1, cfh->cfd()->imm()->NumNotFlushed());
ASSERT_TRUE(cfh->cfd()->mem()->IsEmpty());
}
fault_injection_env->SetFilesystemActive(true);
Destroy(options);
}
TEST_P(DBAtomicFlushTest, FlushMultipleCFs_DropSomeBeforeRequestFlush) {
bool atomic_flush = GetParam();
if (!atomic_flush) {
return;
}
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->EnableProcessing();
CreateAndReopenWithCF({"pikachu", "eevee"}, options);
size_t num_cfs = handles_.size();
ASSERT_EQ(3, num_cfs);
WriteOptions wopts;
wopts.disableWAL = true;
std::vector<int> cf_ids;
for (size_t i = 0; i != num_cfs; ++i) {
int cf_id = static_cast<int>(i);
ASSERT_OK(Put(cf_id, "key", "value", wopts));
cf_ids.push_back(cf_id);
}
ASSERT_OK(dbfull()->DropColumnFamily(handles_[1]));
ASSERT_TRUE(Flush(cf_ids).IsColumnFamilyDropped());
Destroy(options);
}
TEST_P(DBAtomicFlushTest,
FlushMultipleCFs_DropSomeAfterScheduleFlushBeforeFlushJobRun) {
bool atomic_flush = GetParam();
if (!atomic_flush) {
return;
}
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
CreateAndReopenWithCF({"pikachu", "eevee"}, options);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::AtomicFlushMemTables:AfterScheduleFlush",
"DBAtomicFlushTest::BeforeDropCF"},
{"DBAtomicFlushTest::AfterDropCF",
"DBImpl::BackgroundCallFlush:start"}});
SyncPoint::GetInstance()->EnableProcessing();
size_t num_cfs = handles_.size();
ASSERT_EQ(3, num_cfs);
WriteOptions wopts;
wopts.disableWAL = true;
for (size_t i = 0; i != num_cfs; ++i) {
int cf_id = static_cast<int>(i);
ASSERT_OK(Put(cf_id, "key", "value", wopts));
}
port::Thread user_thread([&]() {
TEST_SYNC_POINT("DBAtomicFlushTest::BeforeDropCF");
ASSERT_OK(dbfull()->DropColumnFamily(handles_[1]));
TEST_SYNC_POINT("DBAtomicFlushTest::AfterDropCF");
});
FlushOptions flush_opts;
flush_opts.wait = true;
ASSERT_OK(dbfull()->Flush(flush_opts, handles_));
user_thread.join();
for (size_t i = 0; i != num_cfs; ++i) {
int cf_id = static_cast<int>(i);
ASSERT_EQ("value", Get(cf_id, "key"));
}
ReopenWithColumnFamilies({kDefaultColumnFamilyName, "eevee"}, options);
num_cfs = handles_.size();
ASSERT_EQ(2, num_cfs);
for (size_t i = 0; i != num_cfs; ++i) {
int cf_id = static_cast<int>(i);
ASSERT_EQ("value", Get(cf_id, "key"));
}
Destroy(options);
}
TEST_P(DBAtomicFlushTest, TriggerFlushAndClose) {
bool atomic_flush = GetParam();
if (!atomic_flush) {
return;
}
const int kNumKeysTriggerFlush = 4;
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
options.memtable_factory.reset(
new SpecialSkipListFactory(kNumKeysTriggerFlush));
CreateAndReopenWithCF({"pikachu"}, options);
for (int i = 0; i != kNumKeysTriggerFlush; ++i) {
ASSERT_OK(Put(0, "key" + std::to_string(i), "value" + std::to_string(i)));
}
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put(0, "key", "value"));
Close();
ReopenWithColumnFamilies({kDefaultColumnFamilyName, "pikachu"}, options);
ASSERT_EQ("value", Get(0, "key"));
}
TEST_P(DBAtomicFlushTest, PickMemtablesRaceWithBackgroundFlush) {
bool atomic_flush = GetParam();
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
options.max_write_buffer_number = 4;
// Set min_write_buffer_number_to_merge to be greater than 1, so that
// a column family with one memtable in the imm will not cause IsFlushPending
// to return true when flush_requested_ is false.
options.min_write_buffer_number_to_merge = 2;
CreateAndReopenWithCF({"pikachu"}, options);
ASSERT_EQ(2, handles_.size());
ASSERT_OK(dbfull()->PauseBackgroundWork());
ASSERT_OK(Put(0, "key00", "value00"));
ASSERT_OK(Put(1, "key10", "value10"));
FlushOptions flush_opts;
flush_opts.wait = false;
ASSERT_OK(dbfull()->Flush(flush_opts, handles_));
ASSERT_OK(Put(0, "key01", "value01"));
// Since max_write_buffer_number is 4, the following flush won't cause write
// stall.
ASSERT_OK(dbfull()->Flush(flush_opts));
ASSERT_OK(dbfull()->DropColumnFamily(handles_[1]));
ASSERT_OK(dbfull()->DestroyColumnFamilyHandle(handles_[1]));
handles_[1] = nullptr;
ASSERT_OK(dbfull()->ContinueBackgroundWork());
ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable(handles_[0]));
delete handles_[0];
handles_.clear();
}
TEST_P(DBAtomicFlushTest, CFDropRaceWithWaitForFlushMemTables) {
bool atomic_flush = GetParam();
if (!atomic_flush) {
return;
}
Options options = CurrentOptions();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
CreateAndReopenWithCF({"pikachu"}, options);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::AtomicFlushMemTables:AfterScheduleFlush",
"DBAtomicFlushTest::CFDropRaceWithWaitForFlushMemTables:BeforeDrop"},
{"DBAtomicFlushTest::CFDropRaceWithWaitForFlushMemTables:AfterFree",
"DBImpl::BackgroundCallFlush:start"},
{"DBImpl::BackgroundCallFlush:start",
"DBImpl::AtomicFlushMemTables:BeforeWaitForBgFlush"}});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_EQ(2, handles_.size());
ASSERT_OK(Put(0, "key", "value"));
ASSERT_OK(Put(1, "key", "value"));
auto* cfd_default =
static_cast<ColumnFamilyHandleImpl*>(dbfull()->DefaultColumnFamily())
->cfd();
auto* cfd_pikachu = static_cast<ColumnFamilyHandleImpl*>(handles_[1])->cfd();
port::Thread drop_cf_thr([&]() {
TEST_SYNC_POINT(
"DBAtomicFlushTest::CFDropRaceWithWaitForFlushMemTables:BeforeDrop");
ASSERT_OK(dbfull()->DropColumnFamily(handles_[1]));
delete handles_[1];
handles_.resize(1);
TEST_SYNC_POINT(
"DBAtomicFlushTest::CFDropRaceWithWaitForFlushMemTables:AfterFree");
});
FlushOptions flush_opts;
flush_opts.allow_write_stall = true;
ASSERT_OK(dbfull()->TEST_AtomicFlushMemTables({cfd_default, cfd_pikachu},
flush_opts));
drop_cf_thr.join();
Close();
SyncPoint::GetInstance()->DisableProcessing();
}
TEST_P(DBAtomicFlushTest, RollbackAfterFailToInstallResults) {
bool atomic_flush = GetParam();
if (!atomic_flush) {
return;
}
auto fault_injection_env = std::make_shared<FaultInjectionTestEnv>(env_);
Options options = CurrentOptions();
options.env = fault_injection_env.get();
options.create_if_missing = true;
options.atomic_flush = atomic_flush;
CreateAndReopenWithCF({"pikachu"}, options);
ASSERT_EQ(2, handles_.size());
for (size_t cf = 0; cf < handles_.size(); ++cf) {
ASSERT_OK(Put(static_cast<int>(cf), "a", "value"));
}
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->SetCallBack(
"VersionSet::ProcessManifestWrites:BeforeWriteLastVersionEdit:0",
[&](void* /*arg*/) { fault_injection_env->SetFilesystemActive(false); });
SyncPoint::GetInstance()->EnableProcessing();
FlushOptions flush_opts;
Status s = db_->Flush(flush_opts, handles_);
ASSERT_NOK(s);
fault_injection_env->SetFilesystemActive(true);
Close();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
INSTANTIATE_TEST_CASE_P(DBFlushDirectIOTest, DBFlushDirectIOTest,
testing::Bool());
INSTANTIATE_TEST_CASE_P(DBAtomicFlushTest, DBAtomicFlushTest, testing::Bool());
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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