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rocksdb/db/db_wal_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.
//
// 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 "db/db_test_util.h"
#include "port/stack_trace.h"
#include "util/options_helper.h"
#include "util/sync_point.h"
namespace rocksdb {
class DBWALTest : public DBTestBase {
public:
DBWALTest() : DBTestBase("/db_wal_test") {}
};
TEST_F(DBWALTest, WAL) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
WriteOptions writeOpt = WriteOptions();
writeOpt.disableWAL = true;
ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v1"));
ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "bar", "v1"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
ASSERT_EQ("v1", Get(1, "foo"));
ASSERT_EQ("v1", Get(1, "bar"));
writeOpt.disableWAL = false;
ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "bar", "v2"));
writeOpt.disableWAL = true;
ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v2"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
// Both value's should be present.
ASSERT_EQ("v2", Get(1, "bar"));
ASSERT_EQ("v2", Get(1, "foo"));
writeOpt.disableWAL = true;
ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "bar", "v3"));
writeOpt.disableWAL = false;
ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v3"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
// again both values should be present.
ASSERT_EQ("v3", Get(1, "foo"));
ASSERT_EQ("v3", Get(1, "bar"));
} while (ChangeCompactOptions());
}
TEST_F(DBWALTest, RollLog) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "foo", "v1"));
ASSERT_OK(Put(1, "baz", "v5"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
for (int i = 0; i < 10; i++) {
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
}
ASSERT_OK(Put(1, "foo", "v4"));
for (int i = 0; i < 10; i++) {
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
}
} while (ChangeOptions());
}
TEST_F(DBWALTest, SyncWALNotBlockWrite) {
Options options = CurrentOptions();
options.max_write_buffer_number = 4;
DestroyAndReopen(options);
ASSERT_OK(Put("foo1", "bar1"));
ASSERT_OK(Put("foo5", "bar5"));
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"WritableFileWriter::SyncWithoutFlush:1",
"DBWALTest::SyncWALNotBlockWrite:1"},
{"DBWALTest::SyncWALNotBlockWrite:2",
"WritableFileWriter::SyncWithoutFlush:2"},
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
std::thread thread([&]() { ASSERT_OK(db_->SyncWAL()); });
TEST_SYNC_POINT("DBWALTest::SyncWALNotBlockWrite:1");
ASSERT_OK(Put("foo2", "bar2"));
ASSERT_OK(Put("foo3", "bar3"));
FlushOptions fo;
fo.wait = false;
ASSERT_OK(db_->Flush(fo));
ASSERT_OK(Put("foo4", "bar4"));
TEST_SYNC_POINT("DBWALTest::SyncWALNotBlockWrite:2");
thread.join();
ASSERT_EQ(Get("foo1"), "bar1");
ASSERT_EQ(Get("foo2"), "bar2");
ASSERT_EQ(Get("foo3"), "bar3");
ASSERT_EQ(Get("foo4"), "bar4");
ASSERT_EQ(Get("foo5"), "bar5");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBWALTest, SyncWALNotWaitWrite) {
ASSERT_OK(Put("foo1", "bar1"));
ASSERT_OK(Put("foo3", "bar3"));
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"SpecialEnv::WalFile::Append:1", "DBWALTest::SyncWALNotWaitWrite:1"},
{"DBWALTest::SyncWALNotWaitWrite:2", "SpecialEnv::WalFile::Append:2"},
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
std::thread thread([&]() { ASSERT_OK(Put("foo2", "bar2")); });
TEST_SYNC_POINT("DBWALTest::SyncWALNotWaitWrite:1");
ASSERT_OK(db_->SyncWAL());
TEST_SYNC_POINT("DBWALTest::SyncWALNotWaitWrite:2");
thread.join();
ASSERT_EQ(Get("foo1"), "bar1");
ASSERT_EQ(Get("foo2"), "bar2");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBWALTest, Recover) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "foo", "v1"));
ASSERT_OK(Put(1, "baz", "v5"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
ASSERT_EQ("v1", Get(1, "foo"));
ASSERT_EQ("v1", Get(1, "foo"));
ASSERT_EQ("v5", Get(1, "baz"));
ASSERT_OK(Put(1, "bar", "v2"));
ASSERT_OK(Put(1, "foo", "v3"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
ASSERT_EQ("v3", Get(1, "foo"));
ASSERT_OK(Put(1, "foo", "v4"));
ASSERT_EQ("v4", Get(1, "foo"));
ASSERT_EQ("v2", Get(1, "bar"));
ASSERT_EQ("v5", Get(1, "baz"));
} while (ChangeOptions());
}
TEST_F(DBWALTest, RecoverWithTableHandle) {
do {
Options options = CurrentOptions();
options.create_if_missing = true;
options.disable_auto_compactions = true;
options.avoid_flush_during_recovery = false;
DestroyAndReopen(options);
CreateAndReopenWithCF({"pikachu"}, options);
ASSERT_OK(Put(1, "foo", "v1"));
ASSERT_OK(Put(1, "bar", "v2"));
ASSERT_OK(Flush(1));
ASSERT_OK(Put(1, "foo", "v3"));
ASSERT_OK(Put(1, "bar", "v4"));
ASSERT_OK(Flush(1));
ASSERT_OK(Put(1, "big", std::string(100, 'a')));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
std::vector<std::vector<FileMetaData>> files;
dbfull()->TEST_GetFilesMetaData(handles_[1], &files);
size_t total_files = 0;
for (const auto& level : files) {
total_files += level.size();
}
ASSERT_EQ(total_files, 3);
for (const auto& level : files) {
for (const auto& file : level) {
if (kInfiniteMaxOpenFiles == option_config_) {
ASSERT_TRUE(file.table_reader_handle != nullptr);
} else {
ASSERT_TRUE(file.table_reader_handle == nullptr);
}
}
}
} while (ChangeOptions());
}
TEST_F(DBWALTest, IgnoreRecoveredLog) {
std::string backup_logs = dbname_ + "/backup_logs";
// delete old files in backup_logs directory
env_->CreateDirIfMissing(backup_logs);
std::vector<std::string> old_files;
env_->GetChildren(backup_logs, &old_files);
for (auto& file : old_files) {
if (file != "." && file != "..") {
env_->DeleteFile(backup_logs + "/" + file);
}
}
do {
Options options = CurrentOptions();
options.create_if_missing = true;
options.merge_operator = MergeOperators::CreateUInt64AddOperator();
options.wal_dir = dbname_ + "/logs";
DestroyAndReopen(options);
// fill up the DB
std::string one, two;
PutFixed64(&one, 1);
PutFixed64(&two, 2);
ASSERT_OK(db_->Merge(WriteOptions(), Slice("foo"), Slice(one)));
ASSERT_OK(db_->Merge(WriteOptions(), Slice("foo"), Slice(one)));
ASSERT_OK(db_->Merge(WriteOptions(), Slice("bar"), Slice(one)));
// copy the logs to backup
std::vector<std::string> logs;
env_->GetChildren(options.wal_dir, &logs);
for (auto& log : logs) {
if (log != ".." && log != ".") {
CopyFile(options.wal_dir + "/" + log, backup_logs + "/" + log);
}
}
// recover the DB
Reopen(options);
ASSERT_EQ(two, Get("foo"));
ASSERT_EQ(one, Get("bar"));
Close();
// copy the logs from backup back to wal dir
for (auto& log : logs) {
if (log != ".." && log != ".") {
CopyFile(backup_logs + "/" + log, options.wal_dir + "/" + log);
}
}
// this should ignore the log files, recovery should not happen again
// if the recovery happens, the same merge operator would be called twice,
// leading to incorrect results
Reopen(options);
ASSERT_EQ(two, Get("foo"));
ASSERT_EQ(one, Get("bar"));
Close();
Destroy(options);
Reopen(options);
Close();
// copy the logs from backup back to wal dir
env_->CreateDirIfMissing(options.wal_dir);
for (auto& log : logs) {
if (log != ".." && log != ".") {
CopyFile(backup_logs + "/" + log, options.wal_dir + "/" + log);
}
}
// assert that we successfully recovered only from logs, even though we
// destroyed the DB
Reopen(options);
ASSERT_EQ(two, Get("foo"));
ASSERT_EQ(one, Get("bar"));
// Recovery will fail if DB directory doesn't exist.
Destroy(options);
// copy the logs from backup back to wal dir
env_->CreateDirIfMissing(options.wal_dir);
for (auto& log : logs) {
if (log != ".." && log != ".") {
CopyFile(backup_logs + "/" + log, options.wal_dir + "/" + log);
// we won't be needing this file no more
env_->DeleteFile(backup_logs + "/" + log);
}
}
Status s = TryReopen(options);
ASSERT_TRUE(!s.ok());
} while (ChangeOptions(kSkipHashCuckoo));
}
TEST_F(DBWALTest, RecoveryWithEmptyLog) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "foo", "v1"));
ASSERT_OK(Put(1, "foo", "v2"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "foo", "v3"));
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
ASSERT_EQ("v3", Get(1, "foo"));
} while (ChangeOptions());
}
#if !(defined NDEBUG) || !defined(OS_WIN)
TEST_F(DBWALTest, PreallocateBlock) {
Options options = CurrentOptions();
options.write_buffer_size = 10 * 1000 * 1000;
options.max_total_wal_size = 0;
size_t expected_preallocation_size = static_cast<size_t>(
options.write_buffer_size + options.write_buffer_size / 10);
DestroyAndReopen(options);
std::atomic<int> called(0);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBTestWalFile.GetPreallocationStatus", [&](void* arg) {
ASSERT_TRUE(arg != nullptr);
size_t preallocation_size = *(static_cast<size_t*>(arg));
ASSERT_EQ(expected_preallocation_size, preallocation_size);
called.fetch_add(1);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
Put("", "");
Flush();
Put("", "");
Close();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
ASSERT_EQ(2, called.load());
options.max_total_wal_size = 1000 * 1000;
expected_preallocation_size = static_cast<size_t>(options.max_total_wal_size);
Reopen(options);
called.store(0);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBTestWalFile.GetPreallocationStatus", [&](void* arg) {
ASSERT_TRUE(arg != nullptr);
size_t preallocation_size = *(static_cast<size_t*>(arg));
ASSERT_EQ(expected_preallocation_size, preallocation_size);
called.fetch_add(1);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
Put("", "");
Flush();
Put("", "");
Close();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
ASSERT_EQ(2, called.load());
options.db_write_buffer_size = 800 * 1000;
expected_preallocation_size =
static_cast<size_t>(options.db_write_buffer_size);
Reopen(options);
called.store(0);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBTestWalFile.GetPreallocationStatus", [&](void* arg) {
ASSERT_TRUE(arg != nullptr);
size_t preallocation_size = *(static_cast<size_t*>(arg));
ASSERT_EQ(expected_preallocation_size, preallocation_size);
called.fetch_add(1);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
Put("", "");
Flush();
Put("", "");
Close();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
ASSERT_EQ(2, called.load());
expected_preallocation_size = 700 * 1000;
std::shared_ptr<WriteBufferManager> write_buffer_manager =
std::make_shared<WriteBufferManager>(static_cast<uint64_t>(700 * 1000));
options.write_buffer_manager = write_buffer_manager;
Reopen(options);
called.store(0);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBTestWalFile.GetPreallocationStatus", [&](void* arg) {
ASSERT_TRUE(arg != nullptr);
size_t preallocation_size = *(static_cast<size_t*>(arg));
ASSERT_EQ(expected_preallocation_size, preallocation_size);
called.fetch_add(1);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
Put("", "");
Flush();
Put("", "");
Close();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
ASSERT_EQ(2, called.load());
}
#endif // !(defined NDEBUG) || !defined(OS_WIN)
#ifndef ROCKSDB_LITE
TEST_F(DBWALTest, GetSortedWalFiles) {
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
VectorLogPtr log_files;
ASSERT_OK(dbfull()->GetSortedWalFiles(log_files));
ASSERT_EQ(0, log_files.size());
ASSERT_OK(Put(1, "foo", "v1"));
ASSERT_OK(dbfull()->GetSortedWalFiles(log_files));
ASSERT_EQ(1, log_files.size());
} while (ChangeOptions());
}
TEST_F(DBWALTest, RecoveryWithLogDataForSomeCFs) {
// Test for regression of WAL cleanup missing files that don't contain data
// for every column family.
do {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ASSERT_OK(Put(1, "foo", "v1"));
ASSERT_OK(Put(1, "foo", "v2"));
uint64_t earliest_log_nums[2];
for (int i = 0; i < 2; ++i) {
if (i > 0) {
ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
}
VectorLogPtr log_files;
ASSERT_OK(dbfull()->GetSortedWalFiles(log_files));
if (log_files.size() > 0) {
earliest_log_nums[i] = log_files[0]->LogNumber();
} else {
earliest_log_nums[i] = port::kMaxUint64;
}
}
// Check at least the first WAL was cleaned up during the recovery.
ASSERT_LT(earliest_log_nums[0], earliest_log_nums[1]);
} while (ChangeOptions());
}
TEST_F(DBWALTest, RecoverWithLargeLog) {
do {
{
Options options = CurrentOptions();
CreateAndReopenWithCF({"pikachu"}, options);
ASSERT_OK(Put(1, "big1", std::string(200000, '1')));
ASSERT_OK(Put(1, "big2", std::string(200000, '2')));
ASSERT_OK(Put(1, "small3", std::string(10, '3')));
ASSERT_OK(Put(1, "small4", std::string(10, '4')));
ASSERT_EQ(NumTableFilesAtLevel(0, 1), 0);
}
// Make sure that if we re-open with a small write buffer size that
// we flush table files in the middle of a large log file.
Options options;
options.write_buffer_size = 100000;
options = CurrentOptions(options);
ReopenWithColumnFamilies({"default", "pikachu"}, options);
ASSERT_EQ(NumTableFilesAtLevel(0, 1), 3);
ASSERT_EQ(std::string(200000, '1'), Get(1, "big1"));
ASSERT_EQ(std::string(200000, '2'), Get(1, "big2"));
ASSERT_EQ(std::string(10, '3'), Get(1, "small3"));
ASSERT_EQ(std::string(10, '4'), Get(1, "small4"));
ASSERT_GT(NumTableFilesAtLevel(0, 1), 1);
} while (ChangeCompactOptions());
}
// In https://reviews.facebook.net/D20661 we change
// recovery behavior: previously for each log file each column family
// memtable was flushed, even it was empty. Now it's changed:
// we try to create the smallest number of table files by merging
// updates from multiple logs
TEST_F(DBWALTest, RecoverCheckFileAmountWithSmallWriteBuffer) {
Options options = CurrentOptions();
options.write_buffer_size = 5000000;
CreateAndReopenWithCF({"pikachu", "dobrynia", "nikitich"}, options);
// Since we will reopen DB with smaller write_buffer_size,
// each key will go to new SST file
ASSERT_OK(Put(1, Key(10), DummyString(1000000)));
ASSERT_OK(Put(1, Key(10), DummyString(1000000)));
ASSERT_OK(Put(1, Key(10), DummyString(1000000)));
ASSERT_OK(Put(1, Key(10), DummyString(1000000)));
ASSERT_OK(Put(3, Key(10), DummyString(1)));
// Make 'dobrynia' to be flushed and new WAL file to be created
ASSERT_OK(Put(2, Key(10), DummyString(7500000)));
ASSERT_OK(Put(2, Key(1), DummyString(1)));
dbfull()->TEST_WaitForFlushMemTable(handles_[2]);
{
auto tables = ListTableFiles(env_, dbname_);
ASSERT_EQ(tables.size(), static_cast<size_t>(1));
// Make sure 'dobrynia' was flushed: check sst files amount
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "dobrynia"),
static_cast<uint64_t>(1));
}
// New WAL file
ASSERT_OK(Put(1, Key(1), DummyString(1)));
ASSERT_OK(Put(1, Key(1), DummyString(1)));
ASSERT_OK(Put(3, Key(10), DummyString(1)));
ASSERT_OK(Put(3, Key(10), DummyString(1)));
ASSERT_OK(Put(3, Key(10), DummyString(1)));
options.write_buffer_size = 4096;
options.arena_block_size = 4096;
ReopenWithColumnFamilies({"default", "pikachu", "dobrynia", "nikitich"},
options);
{
// No inserts => default is empty
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "default"),
static_cast<uint64_t>(0));
// First 4 keys goes to separate SSTs + 1 more SST for 2 smaller keys
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "pikachu"),
static_cast<uint64_t>(5));
// 1 SST for big key + 1 SST for small one
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "dobrynia"),
static_cast<uint64_t>(2));
// 1 SST for all keys
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "nikitich"),
static_cast<uint64_t>(1));
}
}
// In https://reviews.facebook.net/D20661 we change
// recovery behavior: previously for each log file each column family
// memtable was flushed, even it wasn't empty. Now it's changed:
// we try to create the smallest number of table files by merging
// updates from multiple logs
TEST_F(DBWALTest, RecoverCheckFileAmount) {
Options options = CurrentOptions();
options.write_buffer_size = 100000;
options.arena_block_size = 4 * 1024;
options.avoid_flush_during_recovery = false;
CreateAndReopenWithCF({"pikachu", "dobrynia", "nikitich"}, options);
ASSERT_OK(Put(0, Key(1), DummyString(1)));
ASSERT_OK(Put(1, Key(1), DummyString(1)));
ASSERT_OK(Put(2, Key(1), DummyString(1)));
// Make 'nikitich' memtable to be flushed
ASSERT_OK(Put(3, Key(10), DummyString(1002400)));
ASSERT_OK(Put(3, Key(1), DummyString(1)));
dbfull()->TEST_WaitForFlushMemTable(handles_[3]);
// 4 memtable are not flushed, 1 sst file
{
auto tables = ListTableFiles(env_, dbname_);
ASSERT_EQ(tables.size(), static_cast<size_t>(1));
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "nikitich"),
static_cast<uint64_t>(1));
}
// Memtable for 'nikitich' has flushed, new WAL file has opened
// 4 memtable still not flushed
// Write to new WAL file
ASSERT_OK(Put(0, Key(1), DummyString(1)));
ASSERT_OK(Put(1, Key(1), DummyString(1)));
ASSERT_OK(Put(2, Key(1), DummyString(1)));
// Fill up 'nikitich' one more time
ASSERT_OK(Put(3, Key(10), DummyString(1002400)));
// make it flush
ASSERT_OK(Put(3, Key(1), DummyString(1)));
dbfull()->TEST_WaitForFlushMemTable(handles_[3]);
// There are still 4 memtable not flushed, and 2 sst tables
ASSERT_OK(Put(0, Key(1), DummyString(1)));
ASSERT_OK(Put(1, Key(1), DummyString(1)));
ASSERT_OK(Put(2, Key(1), DummyString(1)));
{
auto tables = ListTableFiles(env_, dbname_);
ASSERT_EQ(tables.size(), static_cast<size_t>(2));
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "nikitich"),
static_cast<uint64_t>(2));
}
ReopenWithColumnFamilies({"default", "pikachu", "dobrynia", "nikitich"},
options);
{
std::vector<uint64_t> table_files = ListTableFiles(env_, dbname_);
// Check, that records for 'default', 'dobrynia' and 'pikachu' from
// first, second and third WALs went to the same SST.
// So, there is 6 SSTs: three for 'nikitich', one for 'default', one for
// 'dobrynia', one for 'pikachu'
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "default"),
static_cast<uint64_t>(1));
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "nikitich"),
static_cast<uint64_t>(3));
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "dobrynia"),
static_cast<uint64_t>(1));
ASSERT_EQ(GetNumberOfSstFilesForColumnFamily(db_, "pikachu"),
static_cast<uint64_t>(1));
}
}
TEST_F(DBWALTest, SyncMultipleLogs) {
const uint64_t kNumBatches = 2;
const int kBatchSize = 1000;
Options options = CurrentOptions();
options.create_if_missing = true;
options.write_buffer_size = 4096;
Reopen(options);
WriteBatch batch;
WriteOptions wo;
wo.sync = true;
for (uint64_t b = 0; b < kNumBatches; b++) {
batch.Clear();
for (int i = 0; i < kBatchSize; i++) {
batch.Put(Key(i), DummyString(128));
}
dbfull()->Write(wo, &batch);
}
ASSERT_OK(dbfull()->SyncWAL());
}
//
// Test WAL recovery for the various modes available
//
class RecoveryTestHelper {
public:
// Number of WAL files to generate
static const int kWALFilesCount = 10;
// Starting number for the WAL file name like 00010.log
static const int kWALFileOffset = 10;
// Keys to be written per WAL file
static const int kKeysPerWALFile = 1024;
// Size of the value
static const int kValueSize = 10;
// Create WAL files with values filled in
static void FillData(DBWALTest* test, const Options& options,
const size_t wal_count, size_t* count) {
const DBOptions& db_options = options;
*count = 0;
shared_ptr<Cache> table_cache = NewLRUCache(50000, 16);
EnvOptions env_options;
WriteBufferManager write_buffer_manager(db_options.db_write_buffer_size);
unique_ptr<VersionSet> versions;
unique_ptr<WalManager> wal_manager;
WriteController write_controller;
versions.reset(new VersionSet(test->dbname_, &db_options, env_options,
table_cache.get(), &write_buffer_manager,
&write_controller));
wal_manager.reset(new WalManager(db_options, env_options));
std::unique_ptr<log::Writer> current_log_writer;
for (size_t j = kWALFileOffset; j < wal_count + kWALFileOffset; j++) {
uint64_t current_log_number = j;
std::string fname = LogFileName(test->dbname_, current_log_number);
unique_ptr<WritableFile> file;
ASSERT_OK(db_options.env->NewWritableFile(fname, &file, env_options));
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), env_options));
current_log_writer.reset(
new log::Writer(std::move(file_writer), current_log_number,
db_options.recycle_log_file_num > 0));
for (int i = 0; i < kKeysPerWALFile; i++) {
std::string key = "key" + ToString((*count)++);
std::string value = test->DummyString(kValueSize);
assert(current_log_writer.get() != nullptr);
uint64_t seq = versions->LastSequence() + 1;
WriteBatch batch;
batch.Put(key, value);
WriteBatchInternal::SetSequence(&batch, seq);
current_log_writer->AddRecord(WriteBatchInternal::Contents(&batch));
versions->SetLastSequence(seq);
}
}
}
// Recreate and fill the store with some data
static size_t FillData(DBWALTest* test, Options* options) {
options->create_if_missing = true;
test->DestroyAndReopen(*options);
test->Close();
size_t count = 0;
FillData(test, *options, kWALFilesCount, &count);
return count;
}
// Read back all the keys we wrote and return the number of keys found
static size_t GetData(DBWALTest* test) {
size_t count = 0;
for (size_t i = 0; i < kWALFilesCount * kKeysPerWALFile; i++) {
if (test->Get("key" + ToString(i)) != "NOT_FOUND") {
++count;
}
}
return count;
}
// Manuall corrupt the specified WAL
static void CorruptWAL(DBWALTest* test, const Options& options,
const double off, const double len,
const int wal_file_id, const bool trunc = false) {
Env* env = options.env;
std::string fname = LogFileName(test->dbname_, wal_file_id);
uint64_t size;
ASSERT_OK(env->GetFileSize(fname, &size));
ASSERT_GT(size, 0);
#ifdef OS_WIN
// Windows disk cache behaves differently. When we truncate
// the original content is still in the cache due to the original
// handle is still open. Generally, in Windows, one prohibits
// shared access to files and it is not needed for WAL but we allow
// it to induce corruption at various tests.
test->Close();
#endif
if (trunc) {
ASSERT_EQ(0, truncate(fname.c_str(), static_cast<int64_t>(size * off)));
} else {
InduceCorruption(fname, static_cast<size_t>(size * off),
static_cast<size_t>(size * len));
}
}
// Overwrite data with 'a' from offset for length len
static void InduceCorruption(const std::string& filename, size_t offset,
size_t len) {
ASSERT_GT(len, 0U);
int fd = open(filename.c_str(), O_RDWR);
// On windows long is 32-bit
ASSERT_LE(offset, std::numeric_limits<long>::max());
ASSERT_GT(fd, 0);
ASSERT_EQ(offset, lseek(fd, static_cast<long>(offset), SEEK_SET));
void* buf = alloca(len);
memset(buf, 'a', len);
ASSERT_EQ(len, write(fd, buf, static_cast<unsigned int>(len)));
close(fd);
}
};
// Test scope:
// - We expect to open the data store when there is incomplete trailing writes
// at the end of any of the logs
// - We do not expect to open the data store for corruption
TEST_F(DBWALTest, kTolerateCorruptedTailRecords) {
const int jstart = RecoveryTestHelper::kWALFileOffset;
const int jend = jstart + RecoveryTestHelper::kWALFilesCount;
for (auto trunc : {true, false}) { /* Corruption style */
for (int i = 0; i < 4; i++) { /* Corruption offset position */
for (int j = jstart; j < jend; j++) { /* WAL file */
// Fill data for testing
Options options = CurrentOptions();
const size_t row_count = RecoveryTestHelper::FillData(this, &options);
// test checksum failure or parsing
RecoveryTestHelper::CorruptWAL(this, options, /*off=*/i * .3,
/*len%=*/.1, /*wal=*/j, trunc);
if (trunc) {
options.wal_recovery_mode =
WALRecoveryMode::kTolerateCorruptedTailRecords;
options.create_if_missing = false;
ASSERT_OK(TryReopen(options));
const size_t recovered_row_count = RecoveryTestHelper::GetData(this);
ASSERT_TRUE(i == 0 || recovered_row_count > 0);
ASSERT_LT(recovered_row_count, row_count);
} else {
options.wal_recovery_mode =
WALRecoveryMode::kTolerateCorruptedTailRecords;
ASSERT_NOK(TryReopen(options));
}
}
}
}
}
// Test scope:
// We don't expect the data store to be opened if there is any corruption
// (leading, middle or trailing -- incomplete writes or corruption)
TEST_F(DBWALTest, kAbsoluteConsistency) {
const int jstart = RecoveryTestHelper::kWALFileOffset;
const int jend = jstart + RecoveryTestHelper::kWALFilesCount;
// Verify clean slate behavior
Options options = CurrentOptions();
const size_t row_count = RecoveryTestHelper::FillData(this, &options);
options.wal_recovery_mode = WALRecoveryMode::kAbsoluteConsistency;
options.create_if_missing = false;
ASSERT_OK(TryReopen(options));
ASSERT_EQ(RecoveryTestHelper::GetData(this), row_count);
for (auto trunc : {true, false}) { /* Corruption style */
for (int i = 0; i < 4; i++) { /* Corruption offset position */
if (trunc && i == 0) {
continue;
}
for (int j = jstart; j < jend; j++) { /* wal files */
// fill with new date
RecoveryTestHelper::FillData(this, &options);
// corrupt the wal
RecoveryTestHelper::CorruptWAL(this, options, /*off=*/i * .3,
/*len%=*/.1, j, trunc);
// verify
options.wal_recovery_mode = WALRecoveryMode::kAbsoluteConsistency;
options.create_if_missing = false;
ASSERT_NOK(TryReopen(options));
}
}
}
}
// Test scope:
// - We expect to open data store under all circumstances
// - We expect only data upto the point where the first error was encountered
TEST_F(DBWALTest, kPointInTimeRecovery) {
const int jstart = RecoveryTestHelper::kWALFileOffset;
const int jend = jstart + RecoveryTestHelper::kWALFilesCount;
const int maxkeys =
RecoveryTestHelper::kWALFilesCount * RecoveryTestHelper::kKeysPerWALFile;
for (auto trunc : {true, false}) { /* Corruption style */
for (int i = 0; i < 4; i++) { /* Offset of corruption */
for (int j = jstart; j < jend; j++) { /* WAL file */
// Fill data for testing
Options options = CurrentOptions();
const size_t row_count = RecoveryTestHelper::FillData(this, &options);
// Corrupt the wal
RecoveryTestHelper::CorruptWAL(this, options, /*off=*/i * .3,
/*len%=*/.1, j, trunc);
// Verify
options.wal_recovery_mode = WALRecoveryMode::kPointInTimeRecovery;
options.create_if_missing = false;
ASSERT_OK(TryReopen(options));
// Probe data for invariants
size_t recovered_row_count = RecoveryTestHelper::GetData(this);
ASSERT_LT(recovered_row_count, row_count);
bool expect_data = true;
for (size_t k = 0; k < maxkeys; ++k) {
bool found = Get("key" + ToString(i)) != "NOT_FOUND";
if (expect_data && !found) {
expect_data = false;
}
ASSERT_EQ(found, expect_data);
}
const size_t min = RecoveryTestHelper::kKeysPerWALFile *
(j - RecoveryTestHelper::kWALFileOffset);
ASSERT_GE(recovered_row_count, min);
if (!trunc && i != 0) {
const size_t max = RecoveryTestHelper::kKeysPerWALFile *
(j - RecoveryTestHelper::kWALFileOffset + 1);
ASSERT_LE(recovered_row_count, max);
}
}
}
}
}
// Test scope:
// - We expect to open the data store under all scenarios
// - We expect to have recovered records past the corruption zone
TEST_F(DBWALTest, kSkipAnyCorruptedRecords) {
const int jstart = RecoveryTestHelper::kWALFileOffset;
const int jend = jstart + RecoveryTestHelper::kWALFilesCount;
for (auto trunc : {true, false}) { /* Corruption style */
for (int i = 0; i < 4; i++) { /* Corruption offset */
for (int j = jstart; j < jend; j++) { /* wal files */
// Fill data for testing
Options options = CurrentOptions();
const size_t row_count = RecoveryTestHelper::FillData(this, &options);
// Corrupt the WAL
RecoveryTestHelper::CorruptWAL(this, options, /*off=*/i * .3,
/*len%=*/.1, j, trunc);
// Verify behavior
options.wal_recovery_mode = WALRecoveryMode::kSkipAnyCorruptedRecords;
options.create_if_missing = false;
ASSERT_OK(TryReopen(options));
// Probe data for invariants
size_t recovered_row_count = RecoveryTestHelper::GetData(this);
ASSERT_LT(recovered_row_count, row_count);
if (!trunc) {
ASSERT_TRUE(i != 0 || recovered_row_count > 0);
}
}
}
}
}
TEST_F(DBWALTest, AvoidFlushDuringRecovery) {
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.avoid_flush_during_recovery = false;
// Test with flush after recovery.
Reopen(options);
ASSERT_OK(Put("foo", "v1"));
ASSERT_OK(Put("bar", "v2"));
ASSERT_OK(Flush());
ASSERT_OK(Put("foo", "v3"));
ASSERT_OK(Put("bar", "v4"));
ASSERT_EQ(1, TotalTableFiles());
// Reopen DB. Check if WAL logs flushed.
Reopen(options);
ASSERT_EQ("v3", Get("foo"));
ASSERT_EQ("v4", Get("bar"));
ASSERT_EQ(2, TotalTableFiles());
// Test without flush after recovery.
options.avoid_flush_during_recovery = true;
DestroyAndReopen(options);
ASSERT_OK(Put("foo", "v5"));
ASSERT_OK(Put("bar", "v6"));
ASSERT_OK(Flush());
ASSERT_OK(Put("foo", "v7"));
ASSERT_OK(Put("bar", "v8"));
ASSERT_EQ(1, TotalTableFiles());
// Reopen DB. WAL logs should not be flushed this time.
Reopen(options);
ASSERT_EQ("v7", Get("foo"));
ASSERT_EQ("v8", Get("bar"));
ASSERT_EQ(1, TotalTableFiles());
// Force flush with allow_2pc.
options.avoid_flush_during_recovery = true;
options.allow_2pc = true;
ASSERT_OK(Put("foo", "v9"));
ASSERT_OK(Put("bar", "v10"));
ASSERT_OK(Flush());
ASSERT_OK(Put("foo", "v11"));
ASSERT_OK(Put("bar", "v12"));
Reopen(options);
ASSERT_EQ("v11", Get("foo"));
ASSERT_EQ("v12", Get("bar"));
ASSERT_EQ(2, TotalTableFiles());
}
TEST_F(DBWALTest, RecoverWithoutFlush) {
Options options = CurrentOptions();
options.avoid_flush_during_recovery = true;
options.create_if_missing = false;
options.disable_auto_compactions = true;
options.write_buffer_size = 64 * 1024 * 1024;
size_t count = RecoveryTestHelper::FillData(this, &options);
auto validateData = [this, count]() {
for (size_t i = 0; i < count; i++) {
ASSERT_NE(Get("key" + ToString(i)), "NOT_FOUND");
}
};
Reopen(options);
validateData();
// Insert some data without flush
ASSERT_OK(Put("foo", "foo_v1"));
ASSERT_OK(Put("bar", "bar_v1"));
Reopen(options);
validateData();
ASSERT_EQ(Get("foo"), "foo_v1");
ASSERT_EQ(Get("bar"), "bar_v1");
// Insert again and reopen
ASSERT_OK(Put("foo", "foo_v2"));
ASSERT_OK(Put("bar", "bar_v2"));
Reopen(options);
validateData();
ASSERT_EQ(Get("foo"), "foo_v2");
ASSERT_EQ(Get("bar"), "bar_v2");
// manual flush and insert again
Flush();
ASSERT_EQ(Get("foo"), "foo_v2");
ASSERT_EQ(Get("bar"), "bar_v2");
ASSERT_OK(Put("foo", "foo_v3"));
ASSERT_OK(Put("bar", "bar_v3"));
Reopen(options);
validateData();
ASSERT_EQ(Get("foo"), "foo_v3");
ASSERT_EQ(Get("bar"), "bar_v3");
}
TEST_F(DBWALTest, RecoverWithoutFlushMultipleCF) {
const std::string kSmallValue = "v";
const std::string kLargeValue = DummyString(1024);
Options options = CurrentOptions();
options.avoid_flush_during_recovery = true;
options.create_if_missing = false;
options.disable_auto_compactions = true;
auto countWalFiles = [this]() {
VectorLogPtr log_files;
dbfull()->GetSortedWalFiles(log_files);
return log_files.size();
};
// Create DB with multiple column families and multiple log files.
CreateAndReopenWithCF({"one", "two"}, options);
ASSERT_OK(Put(0, "key1", kSmallValue));
ASSERT_OK(Put(1, "key2", kLargeValue));
Flush(1);
ASSERT_EQ(1, countWalFiles());
ASSERT_OK(Put(0, "key3", kSmallValue));
ASSERT_OK(Put(2, "key4", kLargeValue));
Flush(2);
ASSERT_EQ(2, countWalFiles());
// Reopen, insert and flush.
options.db_write_buffer_size = 64 * 1024 * 1024;
ReopenWithColumnFamilies({"default", "one", "two"}, options);
ASSERT_EQ(Get(0, "key1"), kSmallValue);
ASSERT_EQ(Get(1, "key2"), kLargeValue);
ASSERT_EQ(Get(0, "key3"), kSmallValue);
ASSERT_EQ(Get(2, "key4"), kLargeValue);
// Insert more data.
ASSERT_OK(Put(0, "key5", kLargeValue));
ASSERT_OK(Put(1, "key6", kLargeValue));
ASSERT_EQ(3, countWalFiles());
Flush(1);
ASSERT_OK(Put(2, "key7", kLargeValue));
ASSERT_EQ(4, countWalFiles());
// Reopen twice and validate.
for (int i = 0; i < 2; i++) {
ReopenWithColumnFamilies({"default", "one", "two"}, options);
ASSERT_EQ(Get(0, "key1"), kSmallValue);
ASSERT_EQ(Get(1, "key2"), kLargeValue);
ASSERT_EQ(Get(0, "key3"), kSmallValue);
ASSERT_EQ(Get(2, "key4"), kLargeValue);
ASSERT_EQ(Get(0, "key5"), kLargeValue);
ASSERT_EQ(Get(1, "key6"), kLargeValue);
ASSERT_EQ(Get(2, "key7"), kLargeValue);
ASSERT_EQ(4, countWalFiles());
}
}
// In this test we are trying to do the following:
// 1. Create a DB with corrupted WAL log;
// 2. Open with avoid_flush_during_recovery = true;
// 3. Append more data without flushing, which creates new WAL log.
// 4. Open again. See if it can correctly handle previous corruption.
TEST_F(DBWALTest, RecoverFromCorruptedWALWithoutFlush) {
const int jstart = RecoveryTestHelper::kWALFileOffset;
const int jend = jstart + RecoveryTestHelper::kWALFilesCount;
const int kAppendKeys = 100;
Options options = CurrentOptions();
options.avoid_flush_during_recovery = true;
options.create_if_missing = false;
options.disable_auto_compactions = true;
options.write_buffer_size = 64 * 1024 * 1024;
auto getAll = [this]() {
std::vector<std::pair<std::string, std::string>> data;
ReadOptions ropt;
Iterator* iter = dbfull()->NewIterator(ropt);
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
data.push_back(
std::make_pair(iter->key().ToString(), iter->value().ToString()));
}
delete iter;
return data;
};
for (auto& mode : wal_recovery_mode_string_map) {
options.wal_recovery_mode = mode.second;
for (auto trunc : {true, false}) {
for (int i = 0; i < 4; i++) {
for (int j = jstart; j < jend; j++) {
// Create corrupted WAL
RecoveryTestHelper::FillData(this, &options);
RecoveryTestHelper::CorruptWAL(this, options, /*off=*/i * .3,
/*len%=*/.1, /*wal=*/j, trunc);
// Skip the test if DB won't open.
if (!TryReopen(options).ok()) {
ASSERT_TRUE(options.wal_recovery_mode ==
WALRecoveryMode::kAbsoluteConsistency ||
(!trunc &&
options.wal_recovery_mode ==
WALRecoveryMode::kTolerateCorruptedTailRecords));
continue;
}
ASSERT_OK(TryReopen(options));
// Append some more data.
for (int k = 0; k < kAppendKeys; k++) {
std::string key = "extra_key" + ToString(k);
std::string value = DummyString(RecoveryTestHelper::kValueSize);
ASSERT_OK(Put(key, value));
}
// Save data for comparison.
auto data = getAll();
// Reopen. Verify data.
ASSERT_OK(TryReopen(options));
auto actual_data = getAll();
ASSERT_EQ(data, actual_data);
}
}
}
}
}
#endif // ROCKSDB_LITE
} // namespace rocksdb
int main(int argc, char** argv) {
rocksdb::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}