rocksdb/db/error_handler_test.cc
Connor a844591201 wait pending memtable writes on file ingestion or compact range (#6113)
Summary:
**Summary:**
This PR fixes two unordered_write related issues:
- ingestion job may skip the necessary memtable flush https://github.com/facebook/rocksdb/issues/6026
- compact range may cause memtable is flushed before pending unordered write finished
    1. `CompactRange` triggers memtable flush but doesn't wait for pending-writes
    2.  there are some pending writes but memtable is already flushed
    3.  the memtable related WAL is removed( note that the pending-writes were recorded in that WAL).
    4.  pending-writes write to newer created memtable
    5. there is a restart
    6. missing the previous pending-writes because WAL is removed but they aren't included in SST.

**How to solve:**
- Wait pending memtable writes before ingestion job check memtable key range
- Wait pending memtable writes before flush memtable.
**Note that: `CompactRange` calls `RangesOverlapWithMemtables` too without waiting for pending waits, but I'm not sure whether it affects the correctness.**

**Test Plan:**
make check
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6113

Differential Revision: D18895674

Pulled By: maysamyabandeh

fbshipit-source-id: da22b4476fc7e06c176020e7cc171eb78189ecaf
2019-12-12 14:08:02 -08:00

694 lines
21 KiB
C++

// 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.
#ifndef ROCKSDB_LITE
#include "db/db_test_util.h"
#include "port/stack_trace.h"
#include "rocksdb/perf_context.h"
#include "rocksdb/sst_file_manager.h"
#include "test_util/fault_injection_test_env.h"
#if !defined(ROCKSDB_LITE)
#include "test_util/sync_point.h"
#endif
namespace rocksdb {
class DBErrorHandlingTest : public DBTestBase {
public:
DBErrorHandlingTest() : DBTestBase("/db_error_handling_test") {}
};
class DBErrorHandlingEnv : public EnvWrapper {
public:
DBErrorHandlingEnv() : EnvWrapper(Env::Default()),
trig_no_space(false), trig_io_error(false) {}
void SetTrigNoSpace() {trig_no_space = true;}
void SetTrigIoError() {trig_io_error = true;}
private:
bool trig_no_space;
bool trig_io_error;
};
class ErrorHandlerListener : public EventListener {
public:
ErrorHandlerListener()
: mutex_(),
cv_(&mutex_),
no_auto_recovery_(false),
recovery_complete_(false),
file_creation_started_(false),
override_bg_error_(false),
file_count_(0),
fault_env_(nullptr) {}
void OnTableFileCreationStarted(
const TableFileCreationBriefInfo& /*ti*/) override {
InstrumentedMutexLock l(&mutex_);
file_creation_started_ = true;
if (file_count_ > 0) {
if (--file_count_ == 0) {
fault_env_->SetFilesystemActive(false, file_creation_error_);
file_creation_error_ = Status::OK();
}
}
cv_.SignalAll();
}
void OnErrorRecoveryBegin(BackgroundErrorReason /*reason*/,
Status /*bg_error*/,
bool* auto_recovery) override {
if (*auto_recovery && no_auto_recovery_) {
*auto_recovery = false;
}
}
void OnErrorRecoveryCompleted(Status /*old_bg_error*/) override {
InstrumentedMutexLock l(&mutex_);
recovery_complete_ = true;
cv_.SignalAll();
}
bool WaitForRecovery(uint64_t /*abs_time_us*/) {
InstrumentedMutexLock l(&mutex_);
while (!recovery_complete_) {
cv_.Wait(/*abs_time_us*/);
}
if (recovery_complete_) {
recovery_complete_ = false;
return true;
}
return false;
}
void WaitForTableFileCreationStarted(uint64_t /*abs_time_us*/) {
InstrumentedMutexLock l(&mutex_);
while (!file_creation_started_) {
cv_.Wait(/*abs_time_us*/);
}
file_creation_started_ = false;
}
void OnBackgroundError(BackgroundErrorReason /*reason*/,
Status* bg_error) override {
if (override_bg_error_) {
*bg_error = bg_error_;
override_bg_error_ = false;
}
}
void EnableAutoRecovery(bool enable = true) { no_auto_recovery_ = !enable; }
void OverrideBGError(Status bg_err) {
bg_error_ = bg_err;
override_bg_error_ = true;
}
void InjectFileCreationError(FaultInjectionTestEnv* env, int file_count,
Status s) {
fault_env_ = env;
file_count_ = file_count;
file_creation_error_ = s;
}
private:
InstrumentedMutex mutex_;
InstrumentedCondVar cv_;
bool no_auto_recovery_;
bool recovery_complete_;
bool file_creation_started_;
bool override_bg_error_;
int file_count_;
Status file_creation_error_;
Status bg_error_;
FaultInjectionTestEnv* fault_env_;
};
TEST_F(DBErrorHandlingTest, FLushWriteError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
std::shared_ptr<ErrorHandlerListener> listener(new ErrorHandlerListener());
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.env = fault_env.get();
options.listeners.emplace_back(listener);
Status s;
listener->EnableAutoRecovery(false);
DestroyAndReopen(options);
Put(Key(0), "val");
SyncPoint::GetInstance()->SetCallBack(
"FlushJob::Start", [&](void *) {
fault_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
});
SyncPoint::GetInstance()->EnableProcessing();
s = Flush();
ASSERT_EQ(s.severity(), rocksdb::Status::Severity::kHardError);
SyncPoint::GetInstance()->DisableProcessing();
fault_env->SetFilesystemActive(true);
s = dbfull()->Resume();
ASSERT_EQ(s, Status::OK());
Reopen(options);
ASSERT_EQ("val", Get(Key(0)));
Destroy(options);
}
TEST_F(DBErrorHandlingTest, CompactionWriteError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
std::shared_ptr<ErrorHandlerListener> listener(new ErrorHandlerListener());
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.level0_file_num_compaction_trigger = 2;
options.listeners.emplace_back(listener);
options.env = fault_env.get();
Status s;
DestroyAndReopen(options);
Put(Key(0), "va;");
Put(Key(2), "va;");
s = Flush();
ASSERT_EQ(s, Status::OK());
listener->OverrideBGError(
Status(Status::NoSpace(), Status::Severity::kHardError)
);
listener->EnableAutoRecovery(false);
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::FlushMemTable:FlushMemTableFinished",
"BackgroundCallCompaction:0"}});
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"BackgroundCallCompaction:0", [&](void *) {
fault_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
Put(Key(1), "val");
s = Flush();
ASSERT_EQ(s, Status::OK());
s = dbfull()->TEST_WaitForCompact();
ASSERT_EQ(s.severity(), rocksdb::Status::Severity::kHardError);
fault_env->SetFilesystemActive(true);
s = dbfull()->Resume();
ASSERT_EQ(s, Status::OK());
Destroy(options);
}
TEST_F(DBErrorHandlingTest, CorruptionError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.level0_file_num_compaction_trigger = 2;
options.env = fault_env.get();
Status s;
DestroyAndReopen(options);
Put(Key(0), "va;");
Put(Key(2), "va;");
s = Flush();
ASSERT_EQ(s, Status::OK());
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"DBImpl::FlushMemTable:FlushMemTableFinished",
"BackgroundCallCompaction:0"}});
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"BackgroundCallCompaction:0", [&](void *) {
fault_env->SetFilesystemActive(false, Status::Corruption("Corruption"));
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
Put(Key(1), "val");
s = Flush();
ASSERT_EQ(s, Status::OK());
s = dbfull()->TEST_WaitForCompact();
ASSERT_EQ(s.severity(), rocksdb::Status::Severity::kUnrecoverableError);
fault_env->SetFilesystemActive(true);
s = dbfull()->Resume();
ASSERT_NE(s, Status::OK());
Destroy(options);
}
TEST_F(DBErrorHandlingTest, AutoRecoverFlushError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
std::shared_ptr<ErrorHandlerListener> listener(new ErrorHandlerListener());
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.env = fault_env.get();
options.listeners.emplace_back(listener);
Status s;
listener->EnableAutoRecovery();
DestroyAndReopen(options);
Put(Key(0), "val");
SyncPoint::GetInstance()->SetCallBack("FlushJob::Start", [&](void*) {
fault_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
});
SyncPoint::GetInstance()->EnableProcessing();
s = Flush();
ASSERT_EQ(s.severity(), rocksdb::Status::Severity::kHardError);
SyncPoint::GetInstance()->DisableProcessing();
fault_env->SetFilesystemActive(true);
ASSERT_EQ(listener->WaitForRecovery(5000000), true);
s = Put(Key(1), "val");
ASSERT_EQ(s, Status::OK());
Reopen(options);
ASSERT_EQ("val", Get(Key(0)));
ASSERT_EQ("val", Get(Key(1)));
Destroy(options);
}
TEST_F(DBErrorHandlingTest, FailRecoverFlushError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
std::shared_ptr<ErrorHandlerListener> listener(new ErrorHandlerListener());
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.env = fault_env.get();
options.listeners.emplace_back(listener);
Status s;
listener->EnableAutoRecovery();
DestroyAndReopen(options);
Put(Key(0), "val");
SyncPoint::GetInstance()->SetCallBack("FlushJob::Start", [&](void*) {
fault_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
});
SyncPoint::GetInstance()->EnableProcessing();
s = Flush();
ASSERT_EQ(s.severity(), rocksdb::Status::Severity::kHardError);
// We should be able to shutdown the database while auto recovery is going
// on in the background
Close();
DestroyDB(dbname_, options);
}
TEST_F(DBErrorHandlingTest, WALWriteError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
std::shared_ptr<ErrorHandlerListener> listener(new ErrorHandlerListener());
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.writable_file_max_buffer_size = 32768;
options.env = fault_env.get();
options.listeners.emplace_back(listener);
Status s;
Random rnd(301);
listener->EnableAutoRecovery();
DestroyAndReopen(options);
{
WriteBatch batch;
for (auto i = 0; i<100; ++i) {
batch.Put(Key(i), RandomString(&rnd, 1024));
}
WriteOptions wopts;
wopts.sync = true;
ASSERT_EQ(dbfull()->Write(wopts, &batch), Status::OK());
};
{
WriteBatch batch;
int write_error = 0;
for (auto i = 100; i<199; ++i) {
batch.Put(Key(i), RandomString(&rnd, 1024));
}
SyncPoint::GetInstance()->SetCallBack("WritableFileWriter::Append:BeforePrepareWrite", [&](void*) {
write_error++;
if (write_error > 2) {
fault_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
}
});
SyncPoint::GetInstance()->EnableProcessing();
WriteOptions wopts;
wopts.sync = true;
s = dbfull()->Write(wopts, &batch);
ASSERT_EQ(s, s.NoSpace());
}
SyncPoint::GetInstance()->DisableProcessing();
fault_env->SetFilesystemActive(true);
ASSERT_EQ(listener->WaitForRecovery(5000000), true);
for (auto i=0; i<199; ++i) {
if (i < 100) {
ASSERT_NE(Get(Key(i)), "NOT_FOUND");
} else {
ASSERT_EQ(Get(Key(i)), "NOT_FOUND");
}
}
Reopen(options);
for (auto i=0; i<199; ++i) {
if (i < 100) {
ASSERT_NE(Get(Key(i)), "NOT_FOUND");
} else {
ASSERT_EQ(Get(Key(i)), "NOT_FOUND");
}
}
Close();
}
TEST_F(DBErrorHandlingTest, MultiCFWALWriteError) {
std::unique_ptr<FaultInjectionTestEnv> fault_env(
new FaultInjectionTestEnv(Env::Default()));
std::shared_ptr<ErrorHandlerListener> listener(new ErrorHandlerListener());
Options options = GetDefaultOptions();
options.create_if_missing = true;
options.writable_file_max_buffer_size = 32768;
options.env = fault_env.get();
options.listeners.emplace_back(listener);
Status s;
Random rnd(301);
listener->EnableAutoRecovery();
CreateAndReopenWithCF({"one", "two", "three"}, options);
{
WriteBatch batch;
for (auto i = 1; i < 4; ++i) {
for (auto j = 0; j < 100; ++j) {
batch.Put(handles_[i], Key(j), RandomString(&rnd, 1024));
}
}
WriteOptions wopts;
wopts.sync = true;
ASSERT_EQ(dbfull()->Write(wopts, &batch), Status::OK());
};
{
WriteBatch batch;
int write_error = 0;
// Write to one CF
for (auto i = 100; i < 199; ++i) {
batch.Put(handles_[2], Key(i), RandomString(&rnd, 1024));
}
SyncPoint::GetInstance()->SetCallBack(
"WritableFileWriter::Append:BeforePrepareWrite", [&](void*) {
write_error++;
if (write_error > 2) {
fault_env->SetFilesystemActive(false,
Status::NoSpace("Out of space"));
}
});
SyncPoint::GetInstance()->EnableProcessing();
WriteOptions wopts;
wopts.sync = true;
s = dbfull()->Write(wopts, &batch);
ASSERT_EQ(s, s.NoSpace());
}
SyncPoint::GetInstance()->DisableProcessing();
fault_env->SetFilesystemActive(true);
ASSERT_EQ(listener->WaitForRecovery(5000000), true);
for (auto i = 1; i < 4; ++i) {
// Every CF should have been flushed
ASSERT_EQ(NumTableFilesAtLevel(0, i), 1);
}
for (auto i = 1; i < 4; ++i) {
for (auto j = 0; j < 199; ++j) {
if (j < 100) {
ASSERT_NE(Get(i, Key(j)), "NOT_FOUND");
} else {
ASSERT_EQ(Get(i, Key(j)), "NOT_FOUND");
}
}
}
ReopenWithColumnFamilies({"default", "one", "two", "three"}, options);
for (auto i = 1; i < 4; ++i) {
for (auto j = 0; j < 199; ++j) {
if (j < 100) {
ASSERT_NE(Get(i, Key(j)), "NOT_FOUND");
} else {
ASSERT_EQ(Get(i, Key(j)), "NOT_FOUND");
}
}
}
Close();
}
TEST_F(DBErrorHandlingTest, MultiDBCompactionError) {
FaultInjectionTestEnv* def_env = new FaultInjectionTestEnv(Env::Default());
std::vector<std::unique_ptr<FaultInjectionTestEnv>> fault_env;
std::vector<Options> options;
std::vector<std::shared_ptr<ErrorHandlerListener>> listener;
std::vector<DB*> db;
std::shared_ptr<SstFileManager> sfm(NewSstFileManager(def_env));
int kNumDbInstances = 3;
Random rnd(301);
for (auto i = 0; i < kNumDbInstances; ++i) {
listener.emplace_back(new ErrorHandlerListener());
options.emplace_back(GetDefaultOptions());
fault_env.emplace_back(new FaultInjectionTestEnv(Env::Default()));
options[i].create_if_missing = true;
options[i].level0_file_num_compaction_trigger = 2;
options[i].writable_file_max_buffer_size = 32768;
options[i].env = fault_env[i].get();
options[i].listeners.emplace_back(listener[i]);
options[i].sst_file_manager = sfm;
DB* dbptr;
char buf[16];
listener[i]->EnableAutoRecovery();
// Setup for returning error for the 3rd SST, which would be level 1
listener[i]->InjectFileCreationError(fault_env[i].get(), 3,
Status::NoSpace("Out of space"));
snprintf(buf, sizeof(buf), "_%d", i);
DestroyDB(dbname_ + std::string(buf), options[i]);
ASSERT_EQ(DB::Open(options[i], dbname_ + std::string(buf), &dbptr),
Status::OK());
db.emplace_back(dbptr);
}
for (auto i = 0; i < kNumDbInstances; ++i) {
WriteBatch batch;
for (auto j = 0; j <= 100; ++j) {
batch.Put(Key(j), RandomString(&rnd, 1024));
}
WriteOptions wopts;
wopts.sync = true;
ASSERT_EQ(db[i]->Write(wopts, &batch), Status::OK());
ASSERT_EQ(db[i]->Flush(FlushOptions()), Status::OK());
}
def_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
for (auto i = 0; i < kNumDbInstances; ++i) {
WriteBatch batch;
// Write to one CF
for (auto j = 100; j < 199; ++j) {
batch.Put(Key(j), RandomString(&rnd, 1024));
}
WriteOptions wopts;
wopts.sync = true;
ASSERT_EQ(db[i]->Write(wopts, &batch), Status::OK());
ASSERT_EQ(db[i]->Flush(FlushOptions()), Status::OK());
}
for (auto i = 0; i < kNumDbInstances; ++i) {
Status s = static_cast<DBImpl*>(db[i])->TEST_WaitForCompact(true);
ASSERT_EQ(s.severity(), Status::Severity::kSoftError);
fault_env[i]->SetFilesystemActive(true);
}
def_env->SetFilesystemActive(true);
for (auto i = 0; i < kNumDbInstances; ++i) {
std::string prop;
ASSERT_EQ(listener[i]->WaitForRecovery(5000000), true);
EXPECT_TRUE(db[i]->GetProperty(
"rocksdb.num-files-at-level" + NumberToString(0), &prop));
EXPECT_EQ(atoi(prop.c_str()), 0);
EXPECT_TRUE(db[i]->GetProperty(
"rocksdb.num-files-at-level" + NumberToString(1), &prop));
EXPECT_EQ(atoi(prop.c_str()), 1);
}
for (auto i = 0; i < kNumDbInstances; ++i) {
char buf[16];
snprintf(buf, sizeof(buf), "_%d", i);
delete db[i];
fault_env[i]->SetFilesystemActive(true);
if (getenv("KEEP_DB")) {
printf("DB is still at %s%s\n", dbname_.c_str(), buf);
} else {
Status s = DestroyDB(dbname_ + std::string(buf), options[i]);
}
}
options.clear();
sfm.reset();
delete def_env;
}
TEST_F(DBErrorHandlingTest, MultiDBVariousErrors) {
FaultInjectionTestEnv* def_env = new FaultInjectionTestEnv(Env::Default());
std::vector<std::unique_ptr<FaultInjectionTestEnv>> fault_env;
std::vector<Options> options;
std::vector<std::shared_ptr<ErrorHandlerListener>> listener;
std::vector<DB*> db;
std::shared_ptr<SstFileManager> sfm(NewSstFileManager(def_env));
int kNumDbInstances = 3;
Random rnd(301);
for (auto i = 0; i < kNumDbInstances; ++i) {
listener.emplace_back(new ErrorHandlerListener());
options.emplace_back(GetDefaultOptions());
fault_env.emplace_back(new FaultInjectionTestEnv(Env::Default()));
options[i].create_if_missing = true;
options[i].level0_file_num_compaction_trigger = 2;
options[i].writable_file_max_buffer_size = 32768;
options[i].env = fault_env[i].get();
options[i].listeners.emplace_back(listener[i]);
options[i].sst_file_manager = sfm;
DB* dbptr;
char buf[16];
listener[i]->EnableAutoRecovery();
switch (i) {
case 0:
// Setup for returning error for the 3rd SST, which would be level 1
listener[i]->InjectFileCreationError(fault_env[i].get(), 3,
Status::NoSpace("Out of space"));
break;
case 1:
// Setup for returning error after the 1st SST, which would result
// in a hard error
listener[i]->InjectFileCreationError(fault_env[i].get(), 2,
Status::NoSpace("Out of space"));
break;
default:
break;
}
snprintf(buf, sizeof(buf), "_%d", i);
DestroyDB(dbname_ + std::string(buf), options[i]);
ASSERT_EQ(DB::Open(options[i], dbname_ + std::string(buf), &dbptr),
Status::OK());
db.emplace_back(dbptr);
}
for (auto i = 0; i < kNumDbInstances; ++i) {
WriteBatch batch;
for (auto j = 0; j <= 100; ++j) {
batch.Put(Key(j), RandomString(&rnd, 1024));
}
WriteOptions wopts;
wopts.sync = true;
ASSERT_EQ(db[i]->Write(wopts, &batch), Status::OK());
ASSERT_EQ(db[i]->Flush(FlushOptions()), Status::OK());
}
def_env->SetFilesystemActive(false, Status::NoSpace("Out of space"));
for (auto i = 0; i < kNumDbInstances; ++i) {
WriteBatch batch;
// Write to one CF
for (auto j = 100; j < 199; ++j) {
batch.Put(Key(j), RandomString(&rnd, 1024));
}
WriteOptions wopts;
wopts.sync = true;
ASSERT_EQ(db[i]->Write(wopts, &batch), Status::OK());
if (i != 1) {
ASSERT_EQ(db[i]->Flush(FlushOptions()), Status::OK());
} else {
ASSERT_EQ(db[i]->Flush(FlushOptions()), Status::NoSpace());
}
}
for (auto i = 0; i < kNumDbInstances; ++i) {
Status s = static_cast<DBImpl*>(db[i])->TEST_WaitForCompact(true);
switch (i) {
case 0:
ASSERT_EQ(s.severity(), Status::Severity::kSoftError);
break;
case 1:
ASSERT_EQ(s.severity(), Status::Severity::kHardError);
break;
case 2:
ASSERT_EQ(s, Status::OK());
break;
}
fault_env[i]->SetFilesystemActive(true);
}
def_env->SetFilesystemActive(true);
for (auto i = 0; i < kNumDbInstances; ++i) {
std::string prop;
if (i < 2) {
ASSERT_EQ(listener[i]->WaitForRecovery(5000000), true);
}
if (i == 1) {
ASSERT_EQ(static_cast<DBImpl*>(db[i])->TEST_WaitForCompact(true),
Status::OK());
}
EXPECT_TRUE(db[i]->GetProperty(
"rocksdb.num-files-at-level" + NumberToString(0), &prop));
EXPECT_EQ(atoi(prop.c_str()), 0);
EXPECT_TRUE(db[i]->GetProperty(
"rocksdb.num-files-at-level" + NumberToString(1), &prop));
EXPECT_EQ(atoi(prop.c_str()), 1);
}
for (auto i = 0; i < kNumDbInstances; ++i) {
char buf[16];
snprintf(buf, sizeof(buf), "_%d", i);
fault_env[i]->SetFilesystemActive(true);
delete db[i];
if (getenv("KEEP_DB")) {
printf("DB is still at %s%s\n", dbname_.c_str(), buf);
} else {
DestroyDB(dbname_ + std::string(buf), options[i]);
}
}
options.clear();
delete def_env;
}
} // namespace rocksdb
int main(int argc, char** argv) {
rocksdb::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
#else
#include <stdio.h>
int main(int /*argc*/, char** /*argv*/) {
fprintf(stderr, "SKIPPED as Cuckoo table is not supported in ROCKSDB_LITE\n");
return 0;
}
#endif // ROCKSDB_LITE