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rocksdb/utilities/transactions/transaction_test.h

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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).
#pragma once
#include <algorithm>
#include <cinttypes>
#include <functional>
#include <string>
#include <thread>
#include "db/db_impl/db_impl.h"
#include "db/db_test_util.h"
#include "port/port.h"
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/utilities/transaction.h"
#include "rocksdb/utilities/transaction_db.h"
#include "table/mock_table.h"
#include "test_util/sync_point.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "test_util/transaction_test_util.h"
#include "util/random.h"
#include "util/string_util.h"
#include "utilities/fault_injection_env.h"
#include "utilities/merge_operators.h"
#include "utilities/merge_operators/string_append/stringappend.h"
#include "utilities/transactions/pessimistic_transaction_db.h"
#include "utilities/transactions/write_unprepared_txn_db.h"
namespace ROCKSDB_NAMESPACE {
// Return true if the ith bit is set in combination represented by comb
bool IsInCombination(size_t i, size_t comb) { return comb & (size_t(1) << i); }
enum WriteOrdering : bool { kOrderedWrite, kUnorderedWrite };
class TransactionTestBase : public ::testing::Test {
public:
TransactionDB* db;
SpecialEnv special_env;
FaultInjectionTestEnv* env;
std::string dbname;
Options options;
TransactionDBOptions txn_db_options;
bool use_stackable_db_;
TransactionTestBase(bool use_stackable_db, bool two_write_queue,
TxnDBWritePolicy write_policy,
WriteOrdering write_ordering)
: db(nullptr),
special_env(Env::Default()),
env(nullptr),
use_stackable_db_(use_stackable_db) {
options.create_if_missing = true;
options.max_write_buffer_number = 2;
options.write_buffer_size = 4 * 1024;
options.unordered_write = write_ordering == kUnorderedWrite;
options.level0_file_num_compaction_trigger = 2;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
special_env.skip_fsync_ = true;
env = new FaultInjectionTestEnv(&special_env);
options.env = env;
options.two_write_queues = two_write_queue;
dbname = test::PerThreadDBPath("transaction_testdb");
EXPECT_OK(DestroyDB(dbname, options));
txn_db_options.transaction_lock_timeout = 0;
txn_db_options.default_lock_timeout = 0;
txn_db_options.write_policy = write_policy;
txn_db_options.rollback_merge_operands = true;
// This will stress write unprepared, by forcing write batch flush on every
// write.
txn_db_options.default_write_batch_flush_threshold = 1;
// Write unprepared requires all transactions to be named. This setting
// autogenerates the name so that existing tests can pass.
txn_db_options.autogenerate_name = true;
Status s;
if (use_stackable_db == false) {
s = TransactionDB::Open(options, txn_db_options, dbname, &db);
} else {
s = OpenWithStackableDB();
}
EXPECT_OK(s);
}
~TransactionTestBase() {
delete db;
db = nullptr;
// This is to skip the assert statement in FaultInjectionTestEnv. There
// seems to be a bug in btrfs that the makes readdir return recently
// unlink-ed files. By using the default fs we simply ignore errors resulted
// from attempting to delete such files in DestroyDB.
if (getenv("KEEP_DB") == nullptr) {
options.env = Env::Default();
EXPECT_OK(DestroyDB(dbname, options));
} else {
fprintf(stdout, "db is still in %s\n", dbname.c_str());
}
delete env;
}
Status ReOpenNoDelete() {
delete db;
db = nullptr;
env->AssertNoOpenFile();
env->DropUnsyncedFileData();
env->ResetState();
Status s;
if (use_stackable_db_ == false) {
s = TransactionDB::Open(options, txn_db_options, dbname, &db);
} else {
s = OpenWithStackableDB();
}
assert(!s.ok() || db != nullptr);
return s;
}
Status ReOpenNoDelete(std::vector<ColumnFamilyDescriptor>& cfs,
std::vector<ColumnFamilyHandle*>* handles) {
for (auto h : *handles) {
delete h;
}
handles->clear();
delete db;
db = nullptr;
env->AssertNoOpenFile();
env->DropUnsyncedFileData();
env->ResetState();
Status s;
if (use_stackable_db_ == false) {
s = TransactionDB::Open(options, txn_db_options, dbname, cfs, handles,
&db);
} else {
s = OpenWithStackableDB(cfs, handles);
}
assert(!s.ok() || db != nullptr);
return s;
}
Status ReOpen() {
delete db;
db = nullptr;
DestroyDB(dbname, options);
Status s;
if (use_stackable_db_ == false) {
s = TransactionDB::Open(options, txn_db_options, dbname, &db);
} else {
s = OpenWithStackableDB();
}
assert(db != nullptr);
return s;
}
Status OpenWithStackableDB(std::vector<ColumnFamilyDescriptor>& cfs,
std::vector<ColumnFamilyHandle*>* handles) {
std::vector<size_t> compaction_enabled_cf_indices;
TransactionDB::PrepareWrap(&options, &cfs, &compaction_enabled_cf_indices);
DB* root_db = nullptr;
Options options_copy(options);
const bool use_seq_per_batch =
txn_db_options.write_policy == WRITE_PREPARED ||
txn_db_options.write_policy == WRITE_UNPREPARED;
const bool use_batch_per_txn =
txn_db_options.write_policy == WRITE_COMMITTED ||
txn_db_options.write_policy == WRITE_PREPARED;
Status s = DBImpl::Open(options_copy, dbname, cfs, handles, &root_db,
use_seq_per_batch, use_batch_per_txn);
auto stackable_db = std::make_unique<StackableDB>(root_db);
if (s.ok()) {
assert(root_db != nullptr);
// If WrapStackableDB() returns non-ok, then stackable_db is already
// deleted within WrapStackableDB().
s = TransactionDB::WrapStackableDB(stackable_db.release(), txn_db_options,
compaction_enabled_cf_indices,
*handles, &db);
}
return s;
}
Status OpenWithStackableDB() {
std::vector<size_t> compaction_enabled_cf_indices;
std::vector<ColumnFamilyDescriptor> column_families{ColumnFamilyDescriptor(
kDefaultColumnFamilyName, ColumnFamilyOptions(options))};
TransactionDB::PrepareWrap(&options, &column_families,
&compaction_enabled_cf_indices);
std::vector<ColumnFamilyHandle*> handles;
DB* root_db = nullptr;
Options options_copy(options);
const bool use_seq_per_batch =
txn_db_options.write_policy == WRITE_PREPARED ||
txn_db_options.write_policy == WRITE_UNPREPARED;
const bool use_batch_per_txn =
txn_db_options.write_policy == WRITE_COMMITTED ||
txn_db_options.write_policy == WRITE_PREPARED;
Status s = DBImpl::Open(options_copy, dbname, column_families, &handles,
&root_db, use_seq_per_batch, use_batch_per_txn);
if (!s.ok()) {
delete root_db;
return s;
}
StackableDB* stackable_db = new StackableDB(root_db);
assert(root_db != nullptr);
assert(handles.size() == 1);
s = TransactionDB::WrapStackableDB(stackable_db, txn_db_options,
compaction_enabled_cf_indices, handles,
&db);
delete handles[0];
if (!s.ok()) {
delete stackable_db;
}
return s;
}
std::atomic<size_t> linked = {0};
std::atomic<size_t> exp_seq = {0};
std::atomic<size_t> commit_writes = {0};
std::atomic<size_t> expected_commits = {0};
// Without Prepare, the commit does not write to WAL
std::atomic<size_t> with_empty_commits = {0};
void TestTxn0(size_t index) {
// Test DB's internal txn. It involves no prepare phase nor a commit marker.
auto s = db->Put(WriteOptions(), "key" + std::to_string(index), "value");
ASSERT_OK(s);
if (txn_db_options.write_policy == TxnDBWritePolicy::WRITE_COMMITTED) {
// Consume one seq per key
exp_seq++;
} else {
// Consume one seq per batch
exp_seq++;
if (options.two_write_queues) {
// Consume one seq for commit
exp_seq++;
}
}
with_empty_commits++;
}
void TestTxn1(size_t index) {
// Testing directly writing a write batch. Functionality-wise it is
// equivalent to commit without prepare.
WriteBatch wb;
auto istr = std::to_string(index);
ASSERT_OK(wb.Put("k1" + istr, "v1"));
ASSERT_OK(wb.Put("k2" + istr, "v2"));
ASSERT_OK(wb.Put("k3" + istr, "v3"));
auto s = db->Write(WriteOptions(), &wb);
if (txn_db_options.write_policy == TxnDBWritePolicy::WRITE_COMMITTED) {
// Consume one seq per key
exp_seq += 3;
} else {
// Consume one seq per batch
exp_seq++;
if (options.two_write_queues) {
// Consume one seq for commit
exp_seq++;
}
}
ASSERT_OK(s);
with_empty_commits++;
}
void TestTxn2(size_t index) {
// Commit without prepare. It should write to DB without a commit marker.
Transaction* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions());
auto istr = std::to_string(index);
ASSERT_OK(txn->SetName("xid" + istr));
ASSERT_OK(txn->Put(Slice("foo" + istr), Slice("bar")));
ASSERT_OK(txn->Put(Slice("foo2" + istr), Slice("bar2")));
ASSERT_OK(txn->Put(Slice("foo3" + istr), Slice("bar3")));
ASSERT_OK(txn->Put(Slice("foo4" + istr), Slice("bar4")));
ASSERT_OK(txn->Commit());
if (txn_db_options.write_policy == TxnDBWritePolicy::WRITE_COMMITTED) {
// Consume one seq per key
exp_seq += 4;
} else if (txn_db_options.write_policy ==
TxnDBWritePolicy::WRITE_PREPARED) {
// Consume one seq per batch
exp_seq++;
if (options.two_write_queues) {
// Consume one seq for commit
exp_seq++;
}
} else {
// Flushed after each key, consume one seq per flushed batch
exp_seq += 4;
// WriteUnprepared implements CommitWithoutPrepareInternal by simply
// calling Prepare then Commit. Consume one seq for the prepare.
exp_seq++;
}
delete txn;
with_empty_commits++;
}
void TestTxn3(size_t index) {
// A full 2pc txn that also involves a commit marker.
Transaction* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions());
auto istr = std::to_string(index);
ASSERT_OK(txn->SetName("xid" + istr));
ASSERT_OK(txn->Put(Slice("foo" + istr), Slice("bar")));
ASSERT_OK(txn->Put(Slice("foo2" + istr), Slice("bar2")));
ASSERT_OK(txn->Put(Slice("foo3" + istr), Slice("bar3")));
ASSERT_OK(txn->Put(Slice("foo4" + istr), Slice("bar4")));
ASSERT_OK(txn->Put(Slice("foo5" + istr), Slice("bar5")));
expected_commits++;
ASSERT_OK(txn->Prepare());
commit_writes++;
ASSERT_OK(txn->Commit());
if (txn_db_options.write_policy == TxnDBWritePolicy::WRITE_COMMITTED) {
// Consume one seq per key
exp_seq += 5;
} else if (txn_db_options.write_policy ==
TxnDBWritePolicy::WRITE_PREPARED) {
// Consume one seq per batch
exp_seq++;
// Consume one seq per commit marker
exp_seq++;
} else {
// Flushed after each key, consume one seq per flushed batch
exp_seq += 5;
// Consume one seq per commit marker
exp_seq++;
}
delete txn;
}
void TestTxn4(size_t index) {
// A full 2pc txn that also involves a commit marker.
Transaction* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions());
auto istr = std::to_string(index);
ASSERT_OK(txn->SetName("xid" + istr));
ASSERT_OK(txn->Put(Slice("foo" + istr), Slice("bar")));
ASSERT_OK(txn->Put(Slice("foo2" + istr), Slice("bar2")));
ASSERT_OK(txn->Put(Slice("foo3" + istr), Slice("bar3")));
ASSERT_OK(txn->Put(Slice("foo4" + istr), Slice("bar4")));
ASSERT_OK(txn->Put(Slice("foo5" + istr), Slice("bar5")));
expected_commits++;
ASSERT_OK(txn->Prepare());
commit_writes++;
ASSERT_OK(txn->Rollback());
if (txn_db_options.write_policy == TxnDBWritePolicy::WRITE_COMMITTED) {
// No seq is consumed for deleting the txn buffer
exp_seq += 0;
} else if (txn_db_options.write_policy ==
TxnDBWritePolicy::WRITE_PREPARED) {
// Consume one seq per batch
exp_seq++;
// Consume one seq per rollback batch
exp_seq++;
if (options.two_write_queues) {
// Consume one seq for rollback commit
exp_seq++;
}
} else {
// Flushed after each key, consume one seq per flushed batch
exp_seq += 5;
// Consume one seq per rollback batch
exp_seq++;
if (options.two_write_queues) {
// Consume one seq for rollback commit
exp_seq++;
}
}
delete txn;
}
// Test that we can change write policy after a clean shutdown (which would
// empty the WAL)
void CrossCompatibilityTest(TxnDBWritePolicy from_policy,
TxnDBWritePolicy to_policy, bool empty_wal) {
TransactionOptions txn_options;
ReadOptions read_options;
WriteOptions write_options;
uint32_t index = 0;
Random rnd(1103);
options.write_buffer_size = 1024; // To create more sst files
std::unordered_map<std::string, std::string> committed_kvs;
Transaction* txn;
txn_db_options.write_policy = from_policy;
if (txn_db_options.write_policy == WRITE_COMMITTED) {
options.unordered_write = false;
}
ASSERT_OK(ReOpen());
for (int i = 0; i < 1024; i++) {
auto istr = std::to_string(index);
auto k = Slice("foo-" + istr).ToString();
auto v = Slice("bar-" + istr).ToString();
// For test the duplicate keys
auto v2 = Slice("bar2-" + istr).ToString();
auto type = rnd.Uniform(4);
switch (type) {
case 0:
committed_kvs[k] = v;
ASSERT_OK(db->Put(write_options, k, v));
committed_kvs[k] = v2;
ASSERT_OK(db->Put(write_options, k, v2));
break;
case 1: {
WriteBatch wb;
committed_kvs[k] = v;
ASSERT_OK(wb.Put(k, v));
committed_kvs[k] = v2;
ASSERT_OK(wb.Put(k, v2));
ASSERT_OK(db->Write(write_options, &wb));
} break;
case 2:
case 3:
txn = db->BeginTransaction(write_options, txn_options);
ASSERT_OK(txn->SetName("xid" + istr));
committed_kvs[k] = v;
ASSERT_OK(txn->Put(k, v));
committed_kvs[k] = v2;
ASSERT_OK(txn->Put(k, v2));
if (type == 3) {
ASSERT_OK(txn->Prepare());
}
ASSERT_OK(txn->Commit());
delete txn;
break;
default:
FAIL();
}
index++;
} // for i
txn_db_options.write_policy = to_policy;
if (txn_db_options.write_policy == WRITE_COMMITTED) {
options.unordered_write = false;
}
auto db_impl = static_cast_with_check<DBImpl>(db->GetRootDB());
// Before upgrade/downgrade the WAL must be emptied
if (empty_wal) {
ASSERT_OK(db_impl->TEST_FlushMemTable());
} else {
ASSERT_OK(db_impl->FlushWAL(true));
}
auto s = ReOpenNoDelete();
if (empty_wal) {
ASSERT_OK(s);
} else {
// Test that we can detect the WAL that is produced by an incompatible
// WritePolicy and fail fast before mis-interpreting the WAL.
ASSERT_TRUE(s.IsNotSupported());
return;
}
db_impl = static_cast_with_check<DBImpl>(db->GetRootDB());
// Check that WAL is empty
VectorLogPtr log_files;
ASSERT_OK(db_impl->GetSortedWalFiles(log_files));
ASSERT_EQ(0, log_files.size());
for (auto& kv : committed_kvs) {
std::string value;
s = db->Get(read_options, kv.first, &value);
if (s.IsNotFound()) {
printf("key = %s\n", kv.first.c_str());
}
ASSERT_OK(s);
if (kv.second != value) {
printf("key = %s\n", kv.first.c_str());
}
ASSERT_EQ(kv.second, value);
}
}
};
class TransactionTest
: public TransactionTestBase,
virtual public ::testing::WithParamInterface<
std::tuple<bool, bool, TxnDBWritePolicy, WriteOrdering>> {
public:
TransactionTest()
: TransactionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam()),
std::get<2>(GetParam()), std::get<3>(GetParam())){};
};
class TransactionStressTest : public TransactionTest {};
class MySQLStyleTransactionTest
: public TransactionTestBase,
virtual public ::testing::WithParamInterface<
std::tuple<bool, bool, TxnDBWritePolicy, WriteOrdering, bool>> {
public:
MySQLStyleTransactionTest()
: TransactionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam()),
std::get<2>(GetParam()), std::get<3>(GetParam())),
with_slow_threads_(std::get<4>(GetParam())) {
if (with_slow_threads_ &&
(txn_db_options.write_policy == WRITE_PREPARED ||
txn_db_options.write_policy == WRITE_UNPREPARED)) {
// The corner case with slow threads involves the caches filling
// over which would not happen even with artifial delays. To help
// such cases to show up we lower the size of the cache-related data
// structures.
txn_db_options.wp_snapshot_cache_bits = 1;
txn_db_options.wp_commit_cache_bits = 10;
options.write_buffer_size = 1024;
EXPECT_OK(ReOpen());
}
};
protected:
// Also emulate slow threads by addin artiftial delays
const bool with_slow_threads_;
};
class WriteCommittedTxnWithTsTest
: public TransactionTestBase,
public ::testing::WithParamInterface<std::tuple<bool, bool, bool>> {
public:
WriteCommittedTxnWithTsTest()
: TransactionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam()),
WRITE_COMMITTED, kOrderedWrite) {}
~WriteCommittedTxnWithTsTest() override {
for (auto* h : handles_) {
delete h;
}
}
Status GetFromDb(ReadOptions read_opts, ColumnFamilyHandle* column_family,
const Slice& key, TxnTimestamp ts, std::string* value) {
std::string ts_buf;
PutFixed64(&ts_buf, ts);
Slice ts_slc = ts_buf;
read_opts.timestamp = &ts_slc;
assert(db);
return db->Get(read_opts, column_family, key, value);
}
Transaction* NewTxn(WriteOptions write_opts, TransactionOptions txn_opts) {
assert(db);
auto* txn = db->BeginTransaction(write_opts, txn_opts);
assert(txn);
const bool enable_indexing = std::get<2>(GetParam());
if (enable_indexing) {
txn->EnableIndexing();
} else {
txn->DisableIndexing();
}
return txn;
}
protected:
std::vector<ColumnFamilyHandle*> handles_{};
};
class TimestampedSnapshotWithTsSanityCheck
: public TransactionTestBase,
public ::testing::WithParamInterface<
std::tuple<bool, bool, TxnDBWritePolicy, WriteOrdering>> {
public:
explicit TimestampedSnapshotWithTsSanityCheck()
: TransactionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam()),
std::get<2>(GetParam()), std::get<3>(GetParam())) {}
~TimestampedSnapshotWithTsSanityCheck() override {
for (auto* h : handles_) {
delete h;
}
}
protected:
std::vector<ColumnFamilyHandle*> handles_{};
};
} // namespace ROCKSDB_NAMESPACE