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rocksdb/db/wal_manager_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).
#ifndef ROCKSDB_LITE
#include "db/wal_manager.h"
#include <map>
#include <string>
#include "db/column_family.h"
#include "db/db_impl/db_impl.h"
#include "db/log_writer.h"
#include "db/version_set.h"
#include "env/mock_env.h"
#include "file/writable_file_writer.h"
#include "rocksdb/cache.h"
#include "rocksdb/file_system.h"
#include "rocksdb/write_batch.h"
#include "rocksdb/write_buffer_manager.h"
#include "table/mock_table.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
// TODO(icanadi) mock out VersionSet
// TODO(icanadi) move other WalManager-specific tests from db_test here
class WalManagerTest : public testing::Test {
public:
WalManagerTest()
: dbname_(test::PerThreadDBPath("wal_manager_test")),
db_options_(),
table_cache_(NewLRUCache(50000, 16)),
write_buffer_manager_(db_options_.db_write_buffer_size),
current_log_number_(0) {
env_.reset(MockEnv::Create(Env::Default()));
EXPECT_OK(DestroyDB(dbname_, Options()));
}
void Init() {
ASSERT_OK(env_->CreateDirIfMissing(dbname_));
ASSERT_OK(env_->CreateDirIfMissing(ArchivalDirectory(dbname_)));
db_options_.db_paths.emplace_back(dbname_,
std::numeric_limits<uint64_t>::max());
db_options_.wal_dir = dbname_;
db_options_.env = env_.get();
db_options_.fs = env_->GetFileSystem();
db_options_.clock = env_->GetSystemClock().get();
versions_.reset(
new VersionSet(dbname_, &db_options_, env_options_, table_cache_.get(),
&write_buffer_manager_, &write_controller_,
/*block_cache_tracer=*/nullptr, /*io_tracer=*/nullptr,
/*db_id*/ "", /*db_session_id*/ ""));
wal_manager_.reset(
new WalManager(db_options_, env_options_, nullptr /*IOTracer*/));
}
void Reopen() {
wal_manager_.reset(
new WalManager(db_options_, env_options_, nullptr /*IOTracer*/));
}
// NOT thread safe
void Put(const std::string& key, const std::string& value) {
assert(current_log_writer_.get() != nullptr);
uint64_t seq = versions_->LastSequence() + 1;
WriteBatch batch;
ASSERT_OK(batch.Put(key, value));
WriteBatchInternal::SetSequence(&batch, seq);
ASSERT_OK(
current_log_writer_->AddRecord(WriteBatchInternal::Contents(&batch)));
versions_->SetLastAllocatedSequence(seq);
versions_->SetLastPublishedSequence(seq);
versions_->SetLastSequence(seq);
}
// NOT thread safe
void RollTheLog(bool /*archived*/) {
current_log_number_++;
std::string fname = ArchivedLogFileName(dbname_, current_log_number_);
const auto& fs = env_->GetFileSystem();
std::unique_ptr<WritableFileWriter> file_writer;
ASSERT_OK(WritableFileWriter::Create(fs, fname, env_options_, &file_writer,
nullptr));
current_log_writer_.reset(new log::Writer(std::move(file_writer), 0, false));
}
void CreateArchiveLogs(int num_logs, int entries_per_log) {
for (int i = 1; i <= num_logs; ++i) {
RollTheLog(true);
for (int k = 0; k < entries_per_log; ++k) {
Put(std::to_string(k), std::string(1024, 'a'));
}
}
}
std::unique_ptr<TransactionLogIterator> OpenTransactionLogIter(
const SequenceNumber seq) {
std::unique_ptr<TransactionLogIterator> iter;
Status status = wal_manager_->GetUpdatesSince(
seq, &iter, TransactionLogIterator::ReadOptions(), versions_.get());
EXPECT_OK(status);
return iter;
}
std::unique_ptr<MockEnv> env_;
std::string dbname_;
ImmutableDBOptions db_options_;
WriteController write_controller_;
EnvOptions env_options_;
std::shared_ptr<Cache> table_cache_;
WriteBufferManager write_buffer_manager_;
std::unique_ptr<VersionSet> versions_;
std::unique_ptr<WalManager> wal_manager_;
std::unique_ptr<log::Writer> current_log_writer_;
uint64_t current_log_number_;
};
TEST_F(WalManagerTest, ReadFirstRecordCache) {
Init();
std::string path = dbname_ + "/000001.log";
std::unique_ptr<FSWritableFile> file;
ASSERT_OK(env_->GetFileSystem()->NewWritableFile(path, FileOptions(), &file,
nullptr));
SequenceNumber s;
ASSERT_OK(wal_manager_->TEST_ReadFirstLine(path, 1 /* number */, &s));
ASSERT_EQ(s, 0U);
ASSERT_OK(
wal_manager_->TEST_ReadFirstRecord(kAliveLogFile, 1 /* number */, &s));
ASSERT_EQ(s, 0U);
std::unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), path, FileOptions()));
log::Writer writer(std::move(file_writer), 1,
db_options_.recycle_log_file_num > 0);
WriteBatch batch;
ASSERT_OK(batch.Put("foo", "bar"));
WriteBatchInternal::SetSequence(&batch, 10);
ASSERT_OK(writer.AddRecord(WriteBatchInternal::Contents(&batch)));
// TODO(icanadi) move SpecialEnv outside of db_test, so we can reuse it here.
// Waiting for lei to finish with db_test
// env_->count_sequential_reads_ = true;
// sequential_read_counter_ sanity test
// ASSERT_EQ(env_->sequential_read_counter_.Read(), 0);
ASSERT_OK(wal_manager_->TEST_ReadFirstRecord(kAliveLogFile, 1, &s));
ASSERT_EQ(s, 10U);
// did a read
// TODO(icanadi) move SpecialEnv outside of db_test, so we can reuse it here
// ASSERT_EQ(env_->sequential_read_counter_.Read(), 1);
ASSERT_OK(wal_manager_->TEST_ReadFirstRecord(kAliveLogFile, 1, &s));
ASSERT_EQ(s, 10U);
// no new reads since the value is cached
// TODO(icanadi) move SpecialEnv outside of db_test, so we can reuse it here
// ASSERT_EQ(env_->sequential_read_counter_.Read(), 1);
}
namespace {
uint64_t GetLogDirSize(std::string dir_path, Env* env) {
uint64_t dir_size = 0;
std::vector<std::string> files;
EXPECT_OK(env->GetChildren(dir_path, &files));
for (auto& f : files) {
uint64_t number;
FileType type;
if (ParseFileName(f, &number, &type) && type == kWalFile) {
std::string const file_path = dir_path + "/" + f;
uint64_t file_size;
EXPECT_OK(env->GetFileSize(file_path, &file_size));
dir_size += file_size;
}
}
return dir_size;
}
std::vector<std::uint64_t> ListSpecificFiles(
Env* env, const std::string& path, const FileType expected_file_type) {
std::vector<std::string> files;
std::vector<uint64_t> file_numbers;
uint64_t number;
FileType type;
EXPECT_OK(env->GetChildren(path, &files));
for (size_t i = 0; i < files.size(); ++i) {
if (ParseFileName(files[i], &number, &type)) {
if (type == expected_file_type) {
file_numbers.push_back(number);
}
}
}
return file_numbers;
}
int CountRecords(TransactionLogIterator* iter) {
int count = 0;
SequenceNumber lastSequence = 0;
BatchResult res;
while (iter->Valid()) {
res = iter->GetBatch();
EXPECT_TRUE(res.sequence > lastSequence);
++count;
lastSequence = res.sequence;
EXPECT_OK(iter->status());
iter->Next();
}
EXPECT_OK(iter->status());
return count;
}
} // namespace
TEST_F(WalManagerTest, WALArchivalSizeLimit) {
db_options_.WAL_ttl_seconds = 0;
db_options_.WAL_size_limit_MB = 1000;
Init();
// TEST : Create WalManager with huge size limit and no ttl.
// Create some archived files and call PurgeObsoleteWALFiles().
// Count the archived log files that survived.
// Assert that all of them did.
// Change size limit. Re-open WalManager.
// Assert that archive is not greater than WAL_size_limit_MB after
// PurgeObsoleteWALFiles()
// Set ttl and time_to_check_ to small values. Re-open db.
// Assert that there are no archived logs left.
std::string archive_dir = ArchivalDirectory(dbname_);
CreateArchiveLogs(20, 5000);
std::vector<std::uint64_t> log_files =
ListSpecificFiles(env_.get(), archive_dir, kWalFile);
ASSERT_EQ(log_files.size(), 20U);
db_options_.WAL_size_limit_MB = 8;
Reopen();
wal_manager_->PurgeObsoleteWALFiles();
uint64_t archive_size = GetLogDirSize(archive_dir, env_.get());
ASSERT_TRUE(archive_size <= db_options_.WAL_size_limit_MB * 1024 * 1024);
db_options_.WAL_ttl_seconds = 1;
env_->SleepForMicroseconds(2 * 1000 * 1000);
Reopen();
wal_manager_->PurgeObsoleteWALFiles();
log_files = ListSpecificFiles(env_.get(), archive_dir, kWalFile);
ASSERT_TRUE(log_files.empty());
}
TEST_F(WalManagerTest, WALArchivalTtl) {
db_options_.WAL_ttl_seconds = 1000;
Init();
// TEST : Create WalManager with a ttl and no size limit.
// Create some archived log files and call PurgeObsoleteWALFiles().
// Assert that files are not deleted
// Reopen db with small ttl.
// Assert that all archived logs was removed.
std::string archive_dir = ArchivalDirectory(dbname_);
CreateArchiveLogs(20, 5000);
std::vector<uint64_t> log_files =
ListSpecificFiles(env_.get(), archive_dir, kWalFile);
ASSERT_GT(log_files.size(), 0U);
db_options_.WAL_ttl_seconds = 1;
env_->SleepForMicroseconds(3 * 1000 * 1000);
Reopen();
wal_manager_->PurgeObsoleteWALFiles();
log_files = ListSpecificFiles(env_.get(), archive_dir, kWalFile);
ASSERT_TRUE(log_files.empty());
}
TEST_F(WalManagerTest, TransactionLogIteratorMoveOverZeroFiles) {
Init();
RollTheLog(false);
Put("key1", std::string(1024, 'a'));
// Create a zero record WAL file.
RollTheLog(false);
RollTheLog(false);
Put("key2", std::string(1024, 'a'));
auto iter = OpenTransactionLogIter(0);
ASSERT_EQ(2, CountRecords(iter.get()));
}
TEST_F(WalManagerTest, TransactionLogIteratorJustEmptyFile) {
Init();
RollTheLog(false);
auto iter = OpenTransactionLogIter(0);
// Check that an empty iterator is returned
ASSERT_TRUE(!iter->Valid());
}
TEST_F(WalManagerTest, TransactionLogIteratorNewFileWhileScanning) {
Init();
CreateArchiveLogs(2, 100);
auto iter = OpenTransactionLogIter(0);
CreateArchiveLogs(1, 100);
int i = 0;
for (; iter->Valid(); iter->Next()) {
i++;
}
ASSERT_EQ(i, 200);
// A new log file was added after the iterator was created.
// TryAgain indicates a new iterator is needed to fetch the new data
ASSERT_TRUE(iter->status().IsTryAgain());
iter = OpenTransactionLogIter(0);
i = 0;
for (; iter->Valid(); iter->Next()) {
i++;
}
ASSERT_EQ(i, 300);
ASSERT_TRUE(iter->status().ok());
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
#else
#include <stdio.h>
int main(int /*argc*/, char** /*argv*/) {
fprintf(stderr, "SKIPPED as WalManager is not supported in ROCKSDB_LITE\n");
return 0;
}
#endif // !ROCKSDB_LITE