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Update WAL corruption test so that it fails without fix (#9942)

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Summary:
In case of non-TransactionDB and avoid_flush_during_recovery = true, RocksDB won't
flush the data from WAL to L0 for all column families if possible. As a
result, not all column families can increase their log_numbers, and
min_log_number_to_keep won't change.
For transaction DB (.allow_2pc), even with the flush, there may be old WAL files that it must not delete because they can contain data of uncommitted transactions and min_log_number_to_keep won't change.
If we persist a new MANIFEST with
advanced log_numbers for some column families, then during a second
crash after persisting the MANIFEST, RocksDB will see some column
families' log_numbers larger than the corrupted WAL, and the "column family inconsistency" error will be hit, causing recovery to fail.

This PR update unit tests to emulate the errors and tests are failing without a fix.

Error:
```
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/0
db/corruption_test.cc:1190: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF test_cf
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/0, where GetParam() = (true, false) (91 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/1
db/corruption_test.cc:1190: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF test_cf
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/1, where GetParam() = (false, false) (92 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/2
db/corruption_test.cc:1190: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF test_cf
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/2, where GetParam() = (true, true) (95 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/3
db/corruption_test.cc:1190: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF test_cf
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/3, where GetParam() = (false, true) (92 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/0
db/corruption_test.cc:1354: Failure
TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/0, where GetParam() = (true, false) (94 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/1
db/corruption_test.cc:1354: Failure
TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/1, where GetParam() = (false, false) (97 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/2
db/corruption_test.cc:1354: Failure
TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/2, where GetParam() = (true, true) (94 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/3
db/corruption_test.cc:1354: Failure
TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/3, where GetParam() = (false, true) (91 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/0
db/corruption_test.cc:1483: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/0, where GetParam() = (true, false) (93 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/1
db/corruption_test.cc:1483: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/1, where GetParam() = (false, false) (94 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/2
db/corruption_test.cc:1483: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/2, where GetParam() = (true, true) (90 ms)
[ RUN      ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/3
db/corruption_test.cc:1483: Failure
DB::Open(options, dbname_, cf_descs, &handles, &db_)
Corruption: SST file is ahead of WALs in CF default
[  FAILED  ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/3, where GetParam() = (false, true) (93 ms)
[----------] 12 tests from CorruptionTest/CrashDuringRecoveryWithCorruptionTest (1116 ms total)

```

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9942

Test Plan: Not needed

Reviewed By: riversand963

Differential Revision: D36324112

Pulled By: akankshamahajan15

fbshipit-source-id: cab2075ac4ebe48f5ef93a6ea162558aa4fc334d
This commit is contained in:
Akanksha Mahajan 2022-05-11 16:12:55 -07:00 committed by Facebook GitHub Bot
parent e96e8e2d05
commit 6442a62e46
2 changed files with 208 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

245
db/corruption_test.cc
View File

@ -308,7 +308,7 @@ class CorruptionTest : public testing::Test {
uint64_t new_size = old_size - bytes_to_truncate;
// If bytes_to_truncate == 0, it will do full truncation.
if (bytes_to_truncate == 0) {
new_size = old_size;
new_size = 0;
}
ASSERT_OK(test::TruncateFile(env_, path, new_size));
}
@ -1049,16 +1049,23 @@ INSTANTIATE_TEST_CASE_P(CorruptionTest, CrashDuringRecoveryWithCorruptionTest,
// "Column family inconsistency: SST file contains data beyond the point of
// corruption" error will be hit, causing recovery to fail.
//
// After adding the fix, corrupted WALs whose numbers are larger than the
// corrupted wal and smaller than the new WAL are moved to a separate folder.
// Only after new WAL is synced, RocksDB persist a new MANIFEST with column
// families to ensure RocksDB is in consistent state.
// After adding the fix, only after new WAL is synced, RocksDB persist a new
// MANIFEST with column families to ensure RocksDB is in consistent state.
// RocksDB writes an empty WriteBatch as a sentinel to the new WAL which is
// synced immediately afterwards. The sequence number of the sentinel
// WriteBatch will be the next sequence number immediately after the largest
// sequence number recovered from previous WALs and MANIFEST because of which DB
// will be in consistent state.
TEST_P(CrashDuringRecoveryWithCorruptionTest, CrashDuringRecovery) {
// If a future recovery starts from the new MANIFEST, then it means the new WAL
// is successfully synced. Due to the sentinel empty write batch at the
// beginning, kPointInTimeRecovery of WAL is guaranteed to go after this point.
// If future recovery starts from the old MANIFEST, it means the writing the new
// MANIFEST failed. It won't have the "SST ahead of WAL" error.
//
// The combination of corrupting a WAL and injecting an error during subsequent
// re-open exposes the bug of prematurely persisting a new MANIFEST with
// advanced ColumnFamilyData::log_number.
TEST_P(CrashDuringRecoveryWithCorruptionTest, DISABLED_CrashDuringRecovery) {
CloseDb();
Options options;
options.track_and_verify_wals_in_manifest =
@ -1068,7 +1075,7 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, CrashDuringRecovery) {
options.env = env_;
ASSERT_OK(DestroyDB(dbname_, options));
options.create_if_missing = true;
options.max_write_buffer_number = 3;
options.max_write_buffer_number = 8;
Reopen(&options);
Status s;
@ -1094,13 +1101,15 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, CrashDuringRecovery) {
// Write one key to test_cf.
ASSERT_OK(db_->Put(WriteOptions(), handles[1], "old_key", "dontcare"));
ASSERT_OK(db_->Flush(FlushOptions(), handles[1]));
// Write to default_cf and flush this cf several times to advance wal
// number.
// number. TEST_SwitchMemtable makes sure WALs are not synced and test can
// corrupt un-sync WAL.
for (int i = 0; i < 2; ++i) {
ASSERT_OK(db_->Put(WriteOptions(), "key" + std::to_string(i), "value"));
ASSERT_OK(dbimpl->TEST_SwitchMemtable());
}
ASSERT_OK(db_->Put(WriteOptions(), handles[1], "dontcare", "dontcare"));
for (auto* h : handles) {
delete h;
@ -1109,12 +1118,13 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, CrashDuringRecovery) {
CloseDb();
}
// 2. Corrupt second last wal file to emulate power reset which caused the DB
// to lose the un-synced WAL.
// 2. Corrupt second last un-syned wal file to emulate power reset which
// caused the DB to lose the un-synced WAL.
{
std::vector<uint64_t> file_nums;
GetSortedWalFiles(file_nums);
size_t size = file_nums.size();
assert(size >= 2);
uint64_t log_num = file_nums[size - 2];
CorruptFileWithTruncation(FileType::kWalFile, log_num,
/*bytes_to_truncate=*/8);
@ -1131,25 +1141,31 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, CrashDuringRecovery) {
// Case2: If avoid_flush_during_recovery = false, all column families have
// flushed their data from WAL to L0 during recovery, and none of them will
// ever need to read the WALs again.
// 4. Fault is injected to fail the recovery.
{
options.avoid_flush_during_recovery = avoid_flush_during_recovery_;
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::GetLogSizeAndMaybeTruncate:0", [&](void* arg) {
auto* tmp_s = reinterpret_cast<Status*>(arg);
assert(tmp_s);
*tmp_s = Status::IOError("Injected");
});
SyncPoint::GetInstance()->EnableProcessing();
handles.clear();
options.avoid_flush_during_recovery = true;
s = DB::Open(options, dbname_, cf_descs, &handles, &db_);
ASSERT_OK(s);
ASSERT_TRUE(s.IsIOError());
ASSERT_EQ("IO error: Injected", s.ToString());
for (auto* h : handles) {
delete h;
}
handles.clear();
CloseDb();
}
// 4. Corrupt max_wal_num to emulate second power reset which caused the
// DB to again lose the un-synced WAL.
{
std::vector<uint64_t> file_nums;
GetSortedWalFiles(file_nums);
size_t size = file_nums.size();
uint64_t log_num = file_nums[size - 1];
CorruptFileWithTruncation(FileType::kWalFile, log_num);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
// 5. After second crash reopen the db with second corruption. Default family
@ -1187,16 +1203,24 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, CrashDuringRecovery) {
// file contains data beyond the point of corruption" error will be hit, causing
// recovery to fail.
//
// After adding the fix, corrupted WALs whose numbers are larger than the
// corrupted wal and smaller than the new WAL are moved to a separate folder.
// Only after new WAL is synced, RocksDB persist a new MANIFEST with column
// families to ensure RocksDB is in consistent state.
// After adding the fix, only after new WAL is synced, RocksDB persist a new
// MANIFEST with column families to ensure RocksDB is in consistent state.
// RocksDB writes an empty WriteBatch as a sentinel to the new WAL which is
// synced immediately afterwards. The sequence number of the sentinel
// WriteBatch will be the next sequence number immediately after the largest
// sequence number recovered from previous WALs and MANIFEST because of which DB
// will be in consistent state.
TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
// If a future recovery starts from the new MANIFEST, then it means the new WAL
// is successfully synced. Due to the sentinel empty write batch at the
// beginning, kPointInTimeRecovery of WAL is guaranteed to go after this point.
// If future recovery starts from the old MANIFEST, it means the writing the new
// MANIFEST failed. It won't have the "SST ahead of WAL" error.
//
// The combination of corrupting a WAL and injecting an error during subsequent
// re-open exposes the bug of prematurely persisting a new MANIFEST with
// advanced ColumnFamilyData::log_number.
TEST_P(CrashDuringRecoveryWithCorruptionTest,
DISABLED_TxnDbCrashDuringRecovery) {
CloseDb();
Options options;
options.wal_recovery_mode = WALRecoveryMode::kPointInTimeRecovery;
@ -1229,7 +1253,6 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
// advance wal number so that some column families have advanced log_number
// while other don't.
{
options.avoid_flush_during_recovery = avoid_flush_during_recovery_;
ASSERT_OK(TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs,
&handles, &txn_db));
@ -1238,6 +1261,8 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
ASSERT_OK(txn->Put(handles[1], "foo", "value"));
ASSERT_OK(txn->SetName("txn0"));
ASSERT_OK(txn->Prepare());
ASSERT_OK(txn_db->Flush(FlushOptions()));
delete txn;
txn = nullptr;
@ -1257,6 +1282,7 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
delete txn;
txn = nullptr;
for (auto* h : handles) {
delete h;
}
@ -1270,6 +1296,7 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
std::vector<uint64_t> file_nums;
GetSortedWalFiles(file_nums);
size_t size = file_nums.size();
assert(size >= 2);
uint64_t log_num = file_nums[size - 2];
CorruptFileWithTruncation(FileType::kWalFile, log_num,
/*bytes_to_truncate=*/8);
@ -1279,24 +1306,38 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
// family has higher log number than corrupted wal number. There may be old
// WAL files that it must not delete because they can contain data of
// uncommitted transactions. As a result, min_log_number_to_keep won't change.
{
options.avoid_flush_during_recovery = avoid_flush_during_recovery_;
ASSERT_OK(TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs,
&handles, &txn_db));
{
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::Open::BeforeSyncWAL", [&](void* arg) {
auto* tmp_s = reinterpret_cast<Status*>(arg);
assert(tmp_s);
*tmp_s = Status::IOError("Injected");
});
SyncPoint::GetInstance()->EnableProcessing();
handles.clear();
s = TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles,
&txn_db);
ASSERT_TRUE(s.IsIOError());
ASSERT_EQ("IO error: Injected", s.ToString());
for (auto* h : handles) {
delete h;
}
handles.clear();
delete txn_db;
CloseDb();
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
// 4. Corrupt max_wal_num to emulate second power reset which caused the
// DB to again lose the un-synced WAL.
// 4. Corrupt max_wal_num.
{
std::vector<uint64_t> file_nums;
GetSortedWalFiles(file_nums);
size_t size = file_nums.size();
assert(size >= 2);
uint64_t log_num = file_nums[size - 1];
CorruptFileWithTruncation(FileType::kWalFile, log_num);
}
@ -1311,8 +1352,6 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
// recovered from previous WALs and MANIFEST, db will be in consistent state
// and opens successfully.
{
options.avoid_flush_during_recovery = false;
ASSERT_OK(TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs,
&handles, &txn_db));
for (auto* h : handles) {
@ -1322,6 +1361,134 @@ TEST_P(CrashDuringRecoveryWithCorruptionTest, TxnDbCrashDuringRecovery) {
}
}
// This test is similar to
// CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery except it calls
// flush and corrupts Last WAL. It calls flush to sync some of the WALs and
// remaining are unsyned one of which is then corrupted to simulate crash.
//
// In case of non-TransactionDB with avoid_flush_during_recovery = true, RocksDB
// won't flush the data from WAL to L0 for all column families if possible. As a
// result, not all column families can increase their log_numbers, and
// min_log_number_to_keep won't change.
// It may prematurely persist a new MANIFEST even before we can declare the DB
// is in consistent state after recovery (this is when the new WAL is synced)
// and advances log_numbers for some column families.
//
// If there is power failure before we sync the new WAL, we will end up in
// a situation in which after persisting the MANIFEST, RocksDB will see some
// column families' log_numbers larger than the corrupted wal, and
// "Column family inconsistency: SST file contains data beyond the point of
// corruption" error will be hit, causing recovery to fail.
//
// After adding the fix, only after new WAL is synced, RocksDB persist a new
// MANIFEST with column families to ensure RocksDB is in consistent state.
// RocksDB writes an empty WriteBatch as a sentinel to the new WAL which is
// synced immediately afterwards. The sequence number of the sentinel
// WriteBatch will be the next sequence number immediately after the largest
// sequence number recovered from previous WALs and MANIFEST because of which DB
// will be in consistent state.
// If a future recovery starts from the new MANIFEST, then it means the new WAL
// is successfully synced. Due to the sentinel empty write batch at the
// beginning, kPointInTimeRecovery of WAL is guaranteed to go after this point.
// If future recovery starts from the old MANIFEST, it means the writing the new
// MANIFEST failed. It won't have the "SST ahead of WAL" error.
// The combination of corrupting a WAL and injecting an error during subsequent
// re-open exposes the bug of prematurely persisting a new MANIFEST with
// advanced ColumnFamilyData::log_number.
TEST_P(CrashDuringRecoveryWithCorruptionTest,
DISABLED_CrashDuringRecoveryWithFlush) {
CloseDb();
Options options;
options.wal_recovery_mode = WALRecoveryMode::kPointInTimeRecovery;
options.avoid_flush_during_recovery = false;
options.env = env_;
options.create_if_missing = true;
ASSERT_OK(DestroyDB(dbname_, options));
Reopen(&options);
ColumnFamilyHandle* cfh = nullptr;
const std::string test_cf_name = "test_cf";
Status s = db_->CreateColumnFamily(options, test_cf_name, &cfh);
ASSERT_OK(s);
delete cfh;
CloseDb();
std::vector<ColumnFamilyDescriptor> cf_descs;
cf_descs.emplace_back(kDefaultColumnFamilyName, options);
cf_descs.emplace_back(test_cf_name, options);
std::vector<ColumnFamilyHandle*> handles;
{
ASSERT_OK(DB::Open(options, dbname_, cf_descs, &handles, &db_));
// Write one key to test_cf.
ASSERT_OK(db_->Put(WriteOptions(), handles[1], "old_key", "dontcare"));
// Write to default_cf and flush this cf several times to advance wal
// number.
for (int i = 0; i < 2; ++i) {
ASSERT_OK(db_->Put(WriteOptions(), "key" + std::to_string(i), "value"));
ASSERT_OK(db_->Flush(FlushOptions()));
}
ASSERT_OK(db_->Put(WriteOptions(), handles[1], "dontcare", "dontcare"));
for (auto* h : handles) {
delete h;
}
handles.clear();
CloseDb();
}
// Corrupt second last un-syned wal file to emulate power reset which
// caused the DB to lose the un-synced WAL.
{
std::vector<uint64_t> file_nums;
GetSortedWalFiles(file_nums);
size_t size = file_nums.size();
uint64_t log_num = file_nums[size - 1];
CorruptFileWithTruncation(FileType::kWalFile, log_num,
/*bytes_to_truncate=*/8);
}
// Fault is injected to fail the recovery.
{
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::GetLogSizeAndMaybeTruncate:0", [&](void* arg) {
auto* tmp_s = reinterpret_cast<Status*>(arg);
assert(tmp_s);
*tmp_s = Status::IOError("Injected");
});
SyncPoint::GetInstance()->EnableProcessing();
handles.clear();
options.avoid_flush_during_recovery = true;
s = DB::Open(options, dbname_, cf_descs, &handles, &db_);
ASSERT_TRUE(s.IsIOError());
ASSERT_EQ("IO error: Injected", s.ToString());
for (auto* h : handles) {
delete h;
}
CloseDb();
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
// Reopen db again
{
options.avoid_flush_during_recovery = avoid_flush_during_recovery_;
ASSERT_OK(DB::Open(options, dbname_, cf_descs, &handles, &db_));
for (auto* h : handles) {
delete h;
}
}
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {

2
db/db_impl/db_impl_open.cc
View File

@ -1326,6 +1326,7 @@ Status DBImpl::GetLogSizeAndMaybeTruncate(uint64_t wal_number, bool truncate,
Status s;
// This gets the appear size of the wals, not including preallocated space.
s = env_->GetFileSize(fname, &log.size);
TEST_SYNC_POINT_CALLBACK("DBImpl::GetLogSizeAndMaybeTruncate:0", /*arg=*/&s);
if (s.ok() && truncate) {
std::unique_ptr<FSWritableFile> last_log;
Status truncate_status = fs_->ReopenWritableFile(
@ -1825,6 +1826,7 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
if (s.ok()) {
// Need to fsync, otherwise it might get lost after a power reset.
s = impl->FlushWAL(false);
TEST_SYNC_POINT_CALLBACK("DBImpl::Open::BeforeSyncWAL", /*arg=*/&s);
if (s.ok()) {
s = log_writer->file()->Sync(impl->immutable_db_options_.use_fsync);
}