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db_flush_test.cc
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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 <limits>
#include "db/db_impl/db_impl.h"
#include "db/db_test_util.h"
#include "env/mock_env.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 "test_util/testutil.h"
#include "util/cast_util.h"
#include "util/mutexlock.h"
#include "utilities/fault_injection_env.h"
#include "utilities/fault_injection_fs.h"
namespace ROCKSDB_NAMESPACE {
// This is a static filter used for filtering
// kvs during the compaction process.
static std::string NEW_VALUE = "NewValue";
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());
ASSERT_EQ(2, TotalTableFiles());
}
// 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:1", "DBImpl::SyncClosedLogs:Start"},
{"DBImpl::SyncClosedLogs:Failed", "DBFlushTest::SyncFail:2"}});
SyncPoint::GetInstance()->EnableProcessing();
CreateAndReopenWithCF({"pikachu"}, options);
ASSERT_OK(Put("key", "value"));
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.
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());
ASSERT_EQ("", FilesPerLevel()); // flush failed.
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(test::NewSpecialSkipListFactory(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 when flush job is submitted to low priority thread pool and when DB is
// closed in the meanwhile, CloseHelper doesn't hang.
TEST_F(DBFlushTest, CloseDBWhenFlushInLowPri) {
Options options = CurrentOptions();
options.max_background_flushes = 1;
options.max_total_wal_size = 8192;
DestroyAndReopen(options);
CreateColumnFamilies({"cf1", "cf2"}, options);
env_->SetBackgroundThreads(0, Env::HIGH);
env_->SetBackgroundThreads(1, Env::LOW);
test::SleepingBackgroundTask sleeping_task_low;
int num_flushes = 0;
SyncPoint::GetInstance()->SetCallBack("DBImpl::BGWorkFlush",
[&](void* /*arg*/) { ++num_flushes; });
int num_low_flush_unscheduled = 0;
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::UnscheduleLowFlushCallback", [&](void* /*arg*/) {
num_low_flush_unscheduled++;
// There should be one flush job in low pool that needs to be
// unscheduled
ASSERT_EQ(num_low_flush_unscheduled, 1);
});
int num_high_flush_unscheduled = 0;
SyncPoint::GetInstance()->SetCallBack(
"DBImpl::UnscheduleHighFlushCallback", [&](void* /*arg*/) {
num_high_flush_unscheduled++;
// There should be no flush job in high pool
ASSERT_EQ(num_high_flush_unscheduled, 0);
});
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(Put(0, "key1", DummyString(8192)));
// Block thread so that flush cannot be run and can be removed from the queue
// when called Unschedule.
env_->Schedule(&test::SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
sleeping_task_low.WaitUntilSleeping();
// Trigger flush and flush job will be scheduled to LOW priority thread.
ASSERT_OK(Put(0, "key2", DummyString(8192)));
// Close DB and flush job in low priority queue will be removed without
// running.
Close();
sleeping_task_low.WakeUp();
sleeping_task_low.WaitUntilDone();
ASSERT_EQ(0, num_flushes);
TryReopenWithColumnFamilies({"default", "cf1", "cf2"}, options);
ASSERT_OK(Put(0, "key3", DummyString(8192)));
ASSERT_OK(Flush(0));
ASSERT_EQ(1, num_flushes);
}
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();
}
// The following 3 tests are designed for testing garbage statistics at flush
// time.
//
// ======= General Information ======= (from GitHub Wiki).
// There are three scenarios where memtable flush can be triggered:
//
// 1 - Memtable size exceeds ColumnFamilyOptions::write_buffer_size
// after a write.
// 2 - Total memtable size across all column families exceeds
// DBOptions::db_write_buffer_size,
// or DBOptions::write_buffer_manager signals a flush. In this scenario
// the largest memtable will be flushed.
// 3 - Total WAL file size exceeds DBOptions::max_total_wal_size.
// In this scenario the memtable with the oldest data will be flushed,
// in order to allow the WAL file with data from this memtable to be
// purged.
//
// As a result, a memtable can be flushed before it is full. This is one
// reason the generated SST file can be smaller than the corresponding
// memtable. Compression is another factor to make SST file smaller than
// corresponding memtable, since data in memtable is uncompressed.
TEST_F(DBFlushTest, StatisticsGarbageBasic) {
Options options = CurrentOptions();
// The following options are used to enforce several values that
// may already exist as default values to make this test resilient
// to default value updates in the future.
options.statistics = CreateDBStatistics();
// Record all statistics.
options.statistics->set_stats_level(StatsLevel::kAll);
// create the DB if it's not already present
options.create_if_missing = true;
// Useful for now as we are trying to compare uncompressed data savings on
// flush().
options.compression = kNoCompression;
// Prevent memtable in place updates. Should already be disabled
// (from Wiki:
// In place updates can be enabled by toggling on the bool
// inplace_update_support flag. However, this flag is by default set to
// false
// because this thread-safe in-place update support is not compatible
// with concurrent memtable writes. Note that the bool
// allow_concurrent_memtable_write is set to true by default )
options.inplace_update_support = false;
options.allow_concurrent_memtable_write = true;
// Enforce size of a single MemTable to 64MB (64MB = 67108864 bytes).
options.write_buffer_size = 64 << 20;
ASSERT_OK(TryReopen(options));
// Put multiple times the same key-values.
// The encoded length of a db entry in the memtable is
// defined in db/memtable.cc (MemTable::Add) as the variable:
// encoded_len= VarintLength(internal_key_size) --> =
// log_256(internal_key).
// Min # of bytes
// necessary to
// store
// internal_key_size.
// + internal_key_size --> = actual key string,
// (size key_size: w/o term null char)
// + 8 bytes for
// fixed uint64 "seq
// number
// +
// insertion type"
// + VarintLength(val_size) --> = min # of bytes to
// store val_size
// + val_size --> = actual value
// string
// For example, in our situation, "key1" : size 4, "value1" : size 6
// (the terminating null characters are not copied over to the memtable).
// And therefore encoded_len = 1 + (4+8) + 1 + 6 = 20 bytes per entry.
// However in terms of raw data contained in the memtable, and written
// over to the SSTable, we only count internal_key_size and val_size,
// because this is the only raw chunk of bytes that contains everything
// necessary to reconstruct a user entry: sequence number, insertion type,
// key, and value.
// To test the relevance of our Memtable garbage statistics,
// namely MEMTABLE_PAYLOAD_BYTES_AT_FLUSH and MEMTABLE_GARBAGE_BYTES_AT_FLUSH,
// we insert K-V pairs with 3 distinct keys (of length 4),
// and random values of arbitrary length RAND_VALUES_LENGTH,
// and we repeat this step NUM_REPEAT times total.
// At the end, we insert 3 final K-V pairs with the same 3 keys
// and known values (these will be the final values, of length 6).
// I chose NUM_REPEAT=2,000 such that no automatic flush is
// triggered (the number of bytes in the memtable is therefore
// well below any meaningful heuristic for a memtable of size 64MB).
// As a result, since each K-V pair is inserted as a payload
// of N meaningful bytes (sequence number, insertion type,
// key, and value = 8 + 4 + RAND_VALUE_LENGTH),
// MEMTABLE_GARBAGE_BYTES_AT_FLUSH should be equal to 2,000 * N bytes
// and MEMTABLE_PAYLAOD_BYTES_AT_FLUSH = MEMTABLE_GARBAGE_BYTES_AT_FLUSH +
// (3*(8 + 4 + 6)) bytes. For RAND_VALUE_LENGTH = 172 (arbitrary value), we
// expect:
// N = 8 + 4 + 172 = 184 bytes
// MEMTABLE_GARBAGE_BYTES_AT_FLUSH = 2,000 * 184 = 368,000 bytes.
// MEMTABLE_PAYLOAD_BYTES_AT_FLUSH = 368,000 + 3*18 = 368,054 bytes.
const size_t NUM_REPEAT = 2000;
const size_t RAND_VALUES_LENGTH = 172;
const std::string KEY1 = "key1";
const std::string KEY2 = "key2";
const std::string KEY3 = "key3";
const std::string VALUE1 = "value1";
const std::string VALUE2 = "value2";
const std::string VALUE3 = "value3";
uint64_t EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH = 0;
uint64_t EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH = 0;
Random rnd(301);
// Insertion of of K-V pairs, multiple times.
for (size_t i = 0; i < NUM_REPEAT; i++) {
// Create value strings of arbitrary length RAND_VALUES_LENGTH bytes.
std::string p_v1 = rnd.RandomString(RAND_VALUES_LENGTH);
std::string p_v2 = rnd.RandomString(RAND_VALUES_LENGTH);
std::string p_v3 = rnd.RandomString(RAND_VALUES_LENGTH);
ASSERT_OK(Put(KEY1, p_v1));
ASSERT_OK(Put(KEY2, p_v2));
ASSERT_OK(Put(KEY3, p_v3));
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY1.size() + p_v1.size() + sizeof(uint64_t);
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY2.size() + p_v2.size() + sizeof(uint64_t);
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY3.size() + p_v3.size() + sizeof(uint64_t);
}
// The memtable data bytes includes the "garbage"
// bytes along with the useful payload.
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH =
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH;
ASSERT_OK(Put(KEY1, VALUE1));
ASSERT_OK(Put(KEY2, VALUE2));
ASSERT_OK(Put(KEY3, VALUE3));
// Add useful payload to the memtable data bytes:
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH +=
KEY1.size() + VALUE1.size() + KEY2.size() + VALUE2.size() + KEY3.size() +
VALUE3.size() + 3 * sizeof(uint64_t);
// We assert that the last K-V pairs have been successfully inserted,
// and that the valid values are VALUE1, VALUE2, VALUE3.
PinnableSlice value;
ASSERT_OK(Get(KEY1, &value));
ASSERT_EQ(value.ToString(), VALUE1);
ASSERT_OK(Get(KEY2, &value));
ASSERT_EQ(value.ToString(), VALUE2);
ASSERT_OK(Get(KEY3, &value));
ASSERT_EQ(value.ToString(), VALUE3);
// Force flush to SST. Increments the statistics counter.
ASSERT_OK(Flush());
// Collect statistics.
uint64_t mem_data_bytes =
TestGetTickerCount(options, MEMTABLE_PAYLOAD_BYTES_AT_FLUSH);
uint64_t mem_garbage_bytes =
TestGetTickerCount(options, MEMTABLE_GARBAGE_BYTES_AT_FLUSH);
EXPECT_EQ(mem_data_bytes, EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH);
EXPECT_EQ(mem_garbage_bytes, EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH);
Close();
}
TEST_F(DBFlushTest, StatisticsGarbageInsertAndDeletes) {
Options options = CurrentOptions();
options.statistics = CreateDBStatistics();
options.statistics->set_stats_level(StatsLevel::kAll);
options.create_if_missing = true;
options.compression = kNoCompression;
options.inplace_update_support = false;
options.allow_concurrent_memtable_write = true;
options.write_buffer_size = 67108864;
ASSERT_OK(TryReopen(options));
const size_t NUM_REPEAT = 2000;
const size_t RAND_VALUES_LENGTH = 37;
const std::string KEY1 = "key1";
const std::string KEY2 = "key2";
const std::string KEY3 = "key3";
const std::string KEY4 = "key4";
const std::string KEY5 = "key5";
const std::string KEY6 = "key6";
uint64_t EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH = 0;
uint64_t EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH = 0;
WriteBatch batch;
Random rnd(301);
// Insertion of of K-V pairs, multiple times.
for (size_t i = 0; i < NUM_REPEAT; i++) {
// Create value strings of arbitrary length RAND_VALUES_LENGTH bytes.
std::string p_v1 = rnd.RandomString(RAND_VALUES_LENGTH);
std::string p_v2 = rnd.RandomString(RAND_VALUES_LENGTH);
std::string p_v3 = rnd.RandomString(RAND_VALUES_LENGTH);
ASSERT_OK(Put(KEY1, p_v1));
ASSERT_OK(Put(KEY2, p_v2));
ASSERT_OK(Put(KEY3, p_v3));
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY1.size() + p_v1.size() + sizeof(uint64_t);
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY2.size() + p_v2.size() + sizeof(uint64_t);
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY3.size() + p_v3.size() + sizeof(uint64_t);
ASSERT_OK(Delete(KEY1));
ASSERT_OK(Delete(KEY2));
ASSERT_OK(Delete(KEY3));
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY1.size() + KEY2.size() + KEY3.size() + 3 * sizeof(uint64_t);
}
// The memtable data bytes includes the "garbage"
// bytes along with the useful payload.
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH =
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH;
// Note : one set of delete for KEY1, KEY2, KEY3 is written to
// SSTable to propagate the delete operations to K-V pairs
// that could have been inserted into the database during past Flush
// opeartions.
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH -=
KEY1.size() + KEY2.size() + KEY3.size() + 3 * sizeof(uint64_t);
// Additional useful paylaod.
ASSERT_OK(Delete(KEY4));
ASSERT_OK(Delete(KEY5));
ASSERT_OK(Delete(KEY6));
// // Add useful payload to the memtable data bytes:
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH +=
KEY4.size() + KEY5.size() + KEY6.size() + 3 * sizeof(uint64_t);
// We assert that the K-V pairs have been successfully deleted.
PinnableSlice value;
ASSERT_NOK(Get(KEY1, &value));
ASSERT_NOK(Get(KEY2, &value));
ASSERT_NOK(Get(KEY3, &value));
// Force flush to SST. Increments the statistics counter.
ASSERT_OK(Flush());
// Collect statistics.
uint64_t mem_data_bytes =
TestGetTickerCount(options, MEMTABLE_PAYLOAD_BYTES_AT_FLUSH);
uint64_t mem_garbage_bytes =
TestGetTickerCount(options, MEMTABLE_GARBAGE_BYTES_AT_FLUSH);
EXPECT_EQ(mem_data_bytes, EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH);
EXPECT_EQ(mem_garbage_bytes, EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH);
Close();
}
TEST_F(DBFlushTest, StatisticsGarbageRangeDeletes) {
Options options = CurrentOptions();
options.statistics = CreateDBStatistics();
options.statistics->set_stats_level(StatsLevel::kAll);
options.create_if_missing = true;
options.compression = kNoCompression;
options.inplace_update_support = false;
options.allow_concurrent_memtable_write = true;
options.write_buffer_size = 67108864;
ASSERT_OK(TryReopen(options));
const size_t NUM_REPEAT = 1000;
const size_t RAND_VALUES_LENGTH = 42;
const std::string KEY1 = "key1";
const std::string KEY2 = "key2";
const std::string KEY3 = "key3";
const std::string KEY4 = "key4";
const std::string KEY5 = "key5";
const std::string KEY6 = "key6";
const std::string VALUE3 = "value3";
uint64_t EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH = 0;
uint64_t EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH = 0;
Random rnd(301);
// Insertion of of K-V pairs, multiple times.
// Also insert DeleteRange
for (size_t i = 0; i < NUM_REPEAT; i++) {
// Create value strings of arbitrary length RAND_VALUES_LENGTH bytes.
std::string p_v1 = rnd.RandomString(RAND_VALUES_LENGTH);
std::string p_v2 = rnd.RandomString(RAND_VALUES_LENGTH);
std::string p_v3 = rnd.RandomString(RAND_VALUES_LENGTH);
ASSERT_OK(Put(KEY1, p_v1));
ASSERT_OK(Put(KEY2, p_v2));
ASSERT_OK(Put(KEY3, p_v3));
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY1.size() + p_v1.size() + sizeof(uint64_t);
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY2.size() + p_v2.size() + sizeof(uint64_t);
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
KEY3.size() + p_v3.size() + sizeof(uint64_t);
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), KEY1,
KEY2));
// Note: DeleteRange have an exclusive upper bound, e.g. here: [KEY2,KEY3)
// is deleted.
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), KEY2,
KEY3));
// Delete ranges are stored as a regular K-V pair, with key=STARTKEY,
// value=ENDKEY.
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH +=
(KEY1.size() + KEY2.size() + sizeof(uint64_t)) +
(KEY2.size() + KEY3.size() + sizeof(uint64_t));
}
// The memtable data bytes includes the "garbage"
// bytes along with the useful payload.
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH =
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH;
// Note : one set of deleteRange for (KEY1, KEY2) and (KEY2, KEY3) is written
// to SSTable to propagate the deleteRange operations to K-V pairs that could
// have been inserted into the database during past Flush opeartions.
EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH -=
(KEY1.size() + KEY2.size() + sizeof(uint64_t)) +
(KEY2.size() + KEY3.size() + sizeof(uint64_t));
// Overwrite KEY3 with known value (VALUE3)
// Note that during the whole time KEY3 has never been deleted
// by the RangeDeletes.
ASSERT_OK(Put(KEY3, VALUE3));
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH +=
KEY3.size() + VALUE3.size() + sizeof(uint64_t);
// Additional useful paylaod.
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), KEY4, KEY5));
ASSERT_OK(
db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(), KEY5, KEY6));
// Add useful payload to the memtable data bytes:
EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH +=
(KEY4.size() + KEY5.size() + sizeof(uint64_t)) +
(KEY5.size() + KEY6.size() + sizeof(uint64_t));
// We assert that the K-V pairs have been successfully deleted.
PinnableSlice value;
ASSERT_NOK(Get(KEY1, &value));
ASSERT_NOK(Get(KEY2, &value));
// And that KEY3's value is correct.
ASSERT_OK(Get(KEY3, &value));
ASSERT_EQ(value, VALUE3);
// Force flush to SST. Increments the statistics counter.
ASSERT_OK(Flush());
// Collect statistics.
uint64_t mem_data_bytes =
TestGetTickerCount(options, MEMTABLE_PAYLOAD_BYTES_AT_FLUSH);
uint64_t mem_garbage_bytes =
TestGetTickerCount(options, MEMTABLE_GARBAGE_BYTES_AT_FLUSH);
EXPECT_EQ(mem_data_bytes, EXPECTED_MEMTABLE_PAYLOAD_BYTES_AT_FLUSH);
EXPECT_EQ(mem_garbage_bytes, EXPECTED_MEMTABLE_GARBAGE_BYTES_AT_FLUSH);
Close();
}
// This simple Listener can only handle one flush at a time.
class TestFlushListener : public EventListener {
public:
TestFlushListener(Env* env, DBFlushTest* test)
: slowdown_count(0), stop_count(0), db_closed(), env_(env), test_(test) {
db_closed = false;
}
~TestFlushListener() override {
prev_fc_info_.status.PermitUncheckedError(); // Ignore the status
}
void OnTableFileCreated(const TableFileCreationInfo& info) override {
// remember the info for later checking the FlushJobInfo.
prev_fc_info_ = info;
ASSERT_GT(info.db_name.size(), 0U);
ASSERT_GT(info.cf_name.size(), 0U);
ASSERT_GT(info.file_path.size(), 0U);
ASSERT_GT(info.job_id, 0);
ASSERT_GT(info.table_properties.data_size, 0U);
ASSERT_GT(info.table_properties.raw_key_size, 0U);
ASSERT_GT(info.table_properties.raw_value_size, 0U);
ASSERT_GT(info.table_properties.num_data_blocks, 0U);
ASSERT_GT(info.table_properties.num_entries, 0U);
ASSERT_EQ(info.file_checksum, kUnknownFileChecksum);
ASSERT_EQ(info.file_checksum_func_name, kUnknownFileChecksumFuncName);
}
void OnFlushCompleted(DB* db, const FlushJobInfo& info) override {
flushed_dbs_.push_back(db);
flushed_column_family_names_.push_back(info.cf_name);
if (info.triggered_writes_slowdown) {
slowdown_count++;
}
if (info.triggered_writes_stop) {
stop_count++;
}
// verify whether the previously created file matches the flushed file.
ASSERT_EQ(prev_fc_info_.db_name, db->GetName());
ASSERT_EQ(prev_fc_info_.cf_name, info.cf_name);
ASSERT_EQ(prev_fc_info_.job_id, info.job_id);
ASSERT_EQ(prev_fc_info_.file_path, info.file_path);
ASSERT_EQ(TableFileNameToNumber(info.file_path), info.file_number);
// Note: the following chunk relies on the notification pertaining to the
// database pointed to by DBTestBase::db_, and is thus bypassed when
// that assumption does not hold (see the test case MultiDBMultiListeners
// below).
ASSERT_TRUE(test_);
if (db == test_->db_) {
std::vector<std::vector<FileMetaData>> files_by_level;
test_->dbfull()->TEST_GetFilesMetaData(db->DefaultColumnFamily(),
&files_by_level);
ASSERT_FALSE(files_by_level.empty());
auto it = std::find_if(files_by_level[0].begin(), files_by_level[0].end(),
[&](const FileMetaData& meta) {
return meta.fd.GetNumber() == info.file_number;
});
ASSERT_NE(it, files_by_level[0].end());
ASSERT_EQ(info.oldest_blob_file_number, it->oldest_blob_file_number);
}
ASSERT_EQ(db->GetEnv()->GetThreadID(), info.thread_id);
ASSERT_GT(info.thread_id, 0U);
}
std::vector<std::string> flushed_column_family_names_;
std::vector<DB*> flushed_dbs_;
int slowdown_count;
int stop_count;
bool db_closing;
std::atomic_bool db_closed;
TableFileCreationInfo prev_fc_info_;
protected:
Env* env_;
DBFlushTest* test_;
};
// RocksDB lite does not support GetLiveFiles()
TEST_F(DBFlushTest, FixFlushReasonRaceFromConcurrentFlushes) {
Options options = CurrentOptions();
options.atomic_flush = true;
options.disable_auto_compactions = true;
CreateAndReopenWithCF({"cf1"}, options);
for (int idx = 0; idx < 1; ++idx) {
ASSERT_OK(Put(0, Key(idx), std::string(1, 'v')));
ASSERT_OK(Put(1, Key(idx), std::string(1, 'v')));
}
// To coerce a manual flush happenning in the middle of GetLiveFiles's flush,
// we need to pause background flush thread and enable it later.
std::shared_ptr<test::SleepingBackgroundTask> sleeping_task =
std::make_shared<test::SleepingBackgroundTask>();
env_->SetBackgroundThreads(1, Env::HIGH);
env_->Schedule(&test::SleepingBackgroundTask::DoSleepTask,
sleeping_task.get(), Env::Priority::HIGH);
sleeping_task->WaitUntilSleeping();
// Coerce a manual flush happenning in the middle of GetLiveFiles's flush
bool get_live_files_paused_at_sync_point = false;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::AtomicFlushMemTables:AfterScheduleFlush", [&](void* /* arg */) {
if (get_live_files_paused_at_sync_point) {
// To prevent non-GetLiveFiles() flush from pausing at this sync point
return;
}
get_live_files_paused_at_sync_point = true;
FlushOptions fo;
fo.wait = false;
fo.allow_write_stall = true;
ASSERT_OK(dbfull()->Flush(fo));
// Resume background flush thread so GetLiveFiles() can finish
sleeping_task->WakeUp();
sleeping_task->WaitUntilDone();
});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
std::vector<std::string> files;
uint64_t manifest_file_size;
// Before the fix, a race condition on default cf's flush reason due to
// concurrent GetLiveFiles's flush and manual flush will fail
// an internal assertion.
// After the fix, such race condition is fixed and there is no assertion
// failure.
ASSERT_OK(db_->GetLiveFiles(files, &manifest_file_size, /*flush*/ true));
ASSERT_TRUE(get_live_files_paused_at_sync_point);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBFlushTest, MemPurgeBasic) {
Options options = CurrentOptions();
// The following options are used to enforce several values that
// may already exist as default values to make this test resilient
// to default value updates in the future.
options.statistics = CreateDBStatistics();
// Record all statistics.
options.statistics->set_stats_level(StatsLevel::kAll);
// create the DB if it's not already present
options.create_if_missing = true;
// Useful for now as we are trying to compare uncompressed data savings on
// flush().
options.compression = kNoCompression;
// Prevent memtable in place updates. Should already be disabled
// (from Wiki:
// In place updates can be enabled by toggling on the bool
// inplace_update_support flag. However, this flag is by default set to
// false
// because this thread-safe in-place update support is not compatible
// with concurrent memtable writes. Note that the bool
// allow_concurrent_memtable_write is set to true by default )
options.inplace_update_support = false;
options.allow_concurrent_memtable_write = true;
// Enforce size of a single MemTable to 64MB (64MB = 67108864 bytes).
options.write_buffer_size = 1 << 20;
// Initially deactivate the MemPurge prototype.
options.experimental_mempurge_threshold = 0.0;
TestFlushListener* listener = new TestFlushListener(options.env, this);
options.listeners.emplace_back(listener);
ASSERT_OK(TryReopen(options));
// RocksDB lite does not support dynamic options
// Dynamically activate the MemPurge prototype without restarting the DB.
ColumnFamilyHandle* cfh = db_->DefaultColumnFamily();
ASSERT_OK(db_->SetOptions(cfh, {{"experimental_mempurge_threshold", "1.0"}}));
std::atomic<uint32_t> mempurge_count{0};
std::atomic<uint32_t> sst_count{0};
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::FlushJob:MemPurgeSuccessful",
[&](void* /*arg*/) { mempurge_count++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::FlushJob:SSTFileCreated", [&](void* /*arg*/) { sst_count++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
std::string KEY1 = "IamKey1";
std::string KEY2 = "IamKey2";
std::string KEY3 = "IamKey3";
std::string KEY4 = "IamKey4";
std::string KEY5 = "IamKey5";
std::string KEY6 = "IamKey6";
std::string KEY7 = "IamKey7";
std::string KEY8 = "IamKey8";
std::string KEY9 = "IamKey9";
std::string RNDKEY1, RNDKEY2, RNDKEY3;
const std::string NOT_FOUND = "NOT_FOUND";
// Heavy overwrite workload,
// more than would fit in maximum allowed memtables.
Random rnd(719);
const size_t NUM_REPEAT = 100;
const size_t RAND_KEYS_LENGTH = 57;
const size_t RAND_VALUES_LENGTH = 10240;
std::string p_v1, p_v2, p_v3, p_v4, p_v5, p_v6, p_v7, p_v8, p_v9, p_rv1,
p_rv2, p_rv3;
// Insert a very first set of keys that will be
// mempurged at least once.
p_v1 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v2 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v3 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v4 = rnd.RandomString(RAND_VALUES_LENGTH);
ASSERT_OK(Put(KEY1, p_v1));
ASSERT_OK(Put(KEY2, p_v2));
ASSERT_OK(Put(KEY3, p_v3));
ASSERT_OK(Put(KEY4, p_v4));
ASSERT_EQ(Get(KEY1), p_v1);
ASSERT_EQ(Get(KEY2), p_v2);
ASSERT_EQ(Get(KEY3), p_v3);
ASSERT_EQ(Get(KEY4), p_v4);
// Insertion of of K-V pairs, multiple times (overwrites).
for (size_t i = 0; i < NUM_REPEAT; i++) {
// Create value strings of arbitrary length RAND_VALUES_LENGTH bytes.
p_v5 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v6 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v7 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v8 = rnd.RandomString(RAND_VALUES_LENGTH);
p_v9 = rnd.RandomString(RAND_VALUES_LENGTH);
ASSERT_OK(Put(KEY5, p_v5));
ASSERT_OK(Put(KEY6, p_v6));
ASSERT_OK(Put(KEY7, p_v7));
ASSERT_OK(Put(KEY8, p_v8));
ASSERT_OK(Put(KEY9, p_v9));
ASSERT_EQ(Get(KEY1), p_v1);
ASSERT_EQ(Get(KEY2), p_v2);
ASSERT_EQ(Get(KEY3), p_v3);
ASSERT_EQ(Get(KEY4), p_v4);
ASSERT_EQ(Get(KEY5), p_v5);
ASSERT_EQ(Get(KEY6), p_v6);
ASSERT_EQ(Get(KEY7), p_v7);
ASSERT_EQ(Get(KEY8), p_v8);
ASSERT_EQ(Get(KEY9), p_v9);
}
// Check that there was at least one mempurge
const uint32_t EXPECTED_MIN_MEMPURGE_COUNT = 1;
// Check that there was no SST files created during flush.
const uint32_t EXPECTED_SST_COUNT = 0;
EXPECT_GE(mempurge_count.exchange(0), EXPECTED_MIN_MEMPURGE_COUNT);
EXPECT_EQ(sst_count.exchange(0), EXPECTED_SST_COUNT);
// Insertion of of K-V pairs, no overwrites.
for (size_t i = 0; i < NUM_REPEAT; i++) {
// Create value strings of arbitrary length RAND_VALUES_LENGTH bytes.
RNDKEY1 = rnd.RandomString(RAND_KEYS_LENGTH);
RNDKEY2 = rnd.RandomString(RAND_KEYS_LENGTH);
RNDKEY3 = rnd.RandomString(RAND_KEYS_LENGTH);
p_rv1 = rnd.RandomString(RAND_VALUES_LENGTH);
p_rv2 = rnd.RandomString(RAND_VALUES_LENGTH);
p_rv3 = rnd.RandomString(RAND_VALUES_LENGTH);
ASSERT_OK(Put(RNDKEY1, p_rv1));
ASSERT_OK(Put(RNDKEY2, p_rv2));
ASSERT_OK(Put(RNDKEY3, p_rv3));
ASSERT_EQ(Get(KEY1), p_v1);
ASSERT_EQ(Get(KEY2), p_v2);
ASSERT_EQ(Get(KEY3), p_v3);
ASSERT_EQ(Get(KEY4), p_v4);
ASSERT_EQ(Get(KEY5), p_v5);
ASSERT_EQ(Get(KEY6), p_v6);
ASSERT_EQ(Get(KEY7), p_v7);
ASSERT_EQ(Get(KEY8), p_v8);
ASSERT_EQ(Get(KEY9), p_v9);
ASSERT_EQ(Get(RNDKEY1), p_rv1);
ASSERT_EQ(Get(RNDKEY2), p_rv2);
ASSERT_EQ(Get(RNDKEY3), p_rv3);
}
// Assert that at least one flush to storage has been performed
EXPECT_GT(sst_count.exchange(0), EXPECTED_SST_COUNT);
// (which will consequently increase the number of mempurges recorded too).
EXPECT_GE(mempurge_count.exchange(0), EXPECTED_MIN_MEMPURGE_COUNT);
// Assert that there is no data corruption, even with
// a flush to storage.
ASSERT_EQ(Get(KEY1), p_v1);
ASSERT_EQ(Get(KEY2), p_v2);
ASSERT_EQ(Get(KEY3), p_v3);
ASSERT_EQ(Get(KEY4), p_v4);
ASSERT_EQ(Get(KEY5), p_v5);
ASSERT_EQ(Get(KEY6), p_v6);
ASSERT_EQ(Get(KEY7), p_v7);
ASSERT_EQ(Get(KEY8), p_v8);
ASSERT_EQ(Get(KEY9), p_v9);
ASSERT_EQ(Get(RNDKEY1), p_rv1);
ASSERT_EQ(Get(RNDKEY2), p_rv2);
ASSERT_EQ(Get(RNDKEY3), p_rv3);
Close();
}
// RocksDB lite does not support dynamic options
TEST_F(DBFlushTest, MemPurgeBasicToggle) {
Options options = CurrentOptions();
// The following options are used to enforce several values that
// may already exist as default values to make this test resilient
// to default value updates in the future.
options.statistics = CreateDBStatistics();
// Record all statistics.
options.statistics->set_stats_level(StatsLevel::kAll);
// create the DB if it's not already present
options.create_if_missing = true;
// Useful for now as we are trying to compare uncompressed data savings on
// flush().
options.compression = kNoCompression;
// Prevent memtable in place updates. Should already be disabled
// (from Wiki:
// In place updates can be enabled by toggling on the bool
// inplace_update_support flag. However, this flag is by default set to
// false
// because this thread-safe in-place update support is not compatible
// with concurrent memtable writes. Note that the bool
// allow_concurrent_memtable_write is set to true by default )
options.inplace_update_support = false;
options.allow_concurrent_memtable_write = true;