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rocksdb/db_stress_tool/multi_ops_txns_stress.cc
Levi Tamasi 0efd7b4ba1 Extend the stress test coverage of MultiGetEntity (#11336) 
Summary:
Similarly to `GetEntity` prior to https://github.com/facebook/rocksdb/issues/11303, the `MultiGetEntity` API is currently
only used in the DB verification logic of the stress tests. The patch introduces
a new mode where all point lookups are performed using `MultiGetEntity`,
and implements the corresponding logic in the non-batched, batched, and
CF consistency tests.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11336

Test Plan: Ran simple blackbox tests for the various stress test flavors.

Reviewed By: akankshamahajan15

Differential Revision: D44513285

Pulled By: ltamasi

fbshipit-source-id: c3db098501bf875b6a356b09fc676a0268d92c35
2023-03-29 20:35:15 -07:00

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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.
#ifdef GFLAGS
#include "db_stress_tool/multi_ops_txns_stress.h"
#include "rocksdb/utilities/write_batch_with_index.h"
#include "util/defer.h"
#include "utilities/fault_injection_fs.h"
#include "utilities/transactions/write_prepared_txn_db.h"
namespace ROCKSDB_NAMESPACE {
// The description of A and C can be found in multi_ops_txns_stress.h
DEFINE_int32(lb_a, 0, "(Inclusive) lower bound of A");
DEFINE_int32(ub_a, 1000, "(Exclusive) upper bound of A");
DEFINE_int32(lb_c, 0, "(Inclusive) lower bound of C");
DEFINE_int32(ub_c, 1000, "(Exclusive) upper bound of C");
DEFINE_string(key_spaces_path, "",
"Path to file describing the lower and upper bounds of A and C");
DEFINE_int32(delay_snapshot_read_one_in, 0,
"With a chance of 1/N, inject a random delay between taking "
"snapshot and read.");
DEFINE_int32(rollback_one_in, 0,
"If non-zero, rollback non-read-only transactions with a "
"probability of 1/N.");
DEFINE_int32(clear_wp_commit_cache_one_in, 0,
"If non-zero, evict all commit entries from commit cache with a "
"probability of 1/N. This options applies to write-prepared and "
"write-unprepared transactions.");
extern "C" bool rocksdb_write_prepared_TEST_ShouldClearCommitCache(void) {
static Random rand(static_cast<uint32_t>(db_stress_env->NowMicros()));
return FLAGS_clear_wp_commit_cache_one_in > 0 &&
rand.OneIn(FLAGS_clear_wp_commit_cache_one_in);
}
// MultiOpsTxnsStressTest can either operate on a database with pre-populated
// data (possibly from previous ones), or create a new db and preload it with
// data specified via `-lb_a`, `-ub_a`, `-lb_c`, `-ub_c`, etc. Among these, we
// define the test key spaces as two key ranges: [lb_a, ub_a) and [lb_c, ub_c).
// The key spaces specification is persisted in a file whose absolute path can
// be specified via `-key_spaces_path`.
//
// Whether an existing db is used or a new one is created, key_spaces_path will
// be used. In the former case, the test reads the key spaces specification
// from `-key_spaces_path` and decodes [lb_a, ub_a) and [lb_c, ub_c). In the
// latter case, the test writes a key spaces specification to a file at the
// location, and this file will be used by future runs until a new db is
// created.
//
// Create a fresh new database (-destroy_db_initially=1 or there is no database
// in the location specified by -db). See PreloadDb().
//
// Use an existing, non-empty database. See ScanExistingDb().
//
// This test is multi-threaded, and thread count can be specified via
// `-threads`. For simplicity, we partition the key ranges and each thread
// operates on a subrange independently.
// Within each subrange, a KeyGenerator object is responsible for key
// generation. A KeyGenerator maintains two sets: set of existing keys within
// [low, high), set of non-existing keys within [low, high). [low, high) is the
// subrange. The test initialization makes sure there is at least one
// non-existing key, otherwise the test will return an error and exit before
// any test thread is spawned.
void MultiOpsTxnsStressTest::KeyGenerator::FinishInit() {
assert(existing_.empty());
assert(!existing_uniq_.empty());
assert(low_ < high_);
for (auto v : existing_uniq_) {
assert(low_ <= v);
assert(high_ > v);
existing_.push_back(v);
}
if (non_existing_uniq_.empty()) {
fprintf(
stderr,
"Cannot allocate key in [%u, %u)\nStart with a new DB or try change "
"the number of threads for testing via -threads=<#threads>\n",
static_cast<unsigned int>(low_), static_cast<unsigned int>(high_));
fflush(stdout);
fflush(stderr);
assert(false);
}
initialized_ = true;
}
std::pair<uint32_t, uint32_t>
MultiOpsTxnsStressTest::KeyGenerator::ChooseExisting() {
assert(initialized_);
const size_t N = existing_.size();
assert(N > 0);
uint32_t rnd = rand_.Uniform(static_cast<int>(N));
assert(rnd < N);
return std::make_pair(existing_[rnd], rnd);
}
uint32_t MultiOpsTxnsStressTest::KeyGenerator::Allocate() {
assert(initialized_);
auto it = non_existing_uniq_.begin();
assert(non_existing_uniq_.end() != it);
uint32_t ret = *it;
// Remove this element from non_existing_.
// Need to call UndoAllocation() if the calling transaction does not commit.
non_existing_uniq_.erase(it);
return ret;
}
void MultiOpsTxnsStressTest::KeyGenerator::Replace(uint32_t old_val,
uint32_t old_pos,
uint32_t new_val) {
assert(initialized_);
{
auto it = existing_uniq_.find(old_val);
assert(it != existing_uniq_.end());
existing_uniq_.erase(it);
}
{
assert(0 == existing_uniq_.count(new_val));
existing_uniq_.insert(new_val);
existing_[old_pos] = new_val;
}
{
assert(0 == non_existing_uniq_.count(old_val));
non_existing_uniq_.insert(old_val);
}
}
void MultiOpsTxnsStressTest::KeyGenerator::UndoAllocation(uint32_t new_val) {
assert(initialized_);
assert(0 == non_existing_uniq_.count(new_val));
non_existing_uniq_.insert(new_val);
}
std::string MultiOpsTxnsStressTest::Record::EncodePrimaryKey(uint32_t a) {
std::string ret;
PutFixed32(&ret, kPrimaryIndexId);
PutFixed32(&ret, a);
char* const buf = &ret[0];
std::reverse(buf, buf + sizeof(kPrimaryIndexId));
std::reverse(buf + sizeof(kPrimaryIndexId),
buf + sizeof(kPrimaryIndexId) + sizeof(a));
return ret;
}
std::string MultiOpsTxnsStressTest::Record::EncodeSecondaryKey(uint32_t c) {
std::string ret;
PutFixed32(&ret, kSecondaryIndexId);
PutFixed32(&ret, c);
char* const buf = &ret[0];
std::reverse(buf, buf + sizeof(kSecondaryIndexId));
std::reverse(buf + sizeof(kSecondaryIndexId),
buf + sizeof(kSecondaryIndexId) + sizeof(c));
return ret;
}
std::string MultiOpsTxnsStressTest::Record::EncodeSecondaryKey(uint32_t c,
uint32_t a) {
std::string ret;
PutFixed32(&ret, kSecondaryIndexId);
PutFixed32(&ret, c);
PutFixed32(&ret, a);
char* const buf = &ret[0];
std::reverse(buf, buf + sizeof(kSecondaryIndexId));
std::reverse(buf + sizeof(kSecondaryIndexId),
buf + sizeof(kSecondaryIndexId) + sizeof(c));
std::reverse(buf + sizeof(kSecondaryIndexId) + sizeof(c),
buf + sizeof(kSecondaryIndexId) + sizeof(c) + sizeof(a));
return ret;
}
std::tuple<Status, uint32_t, uint32_t>
MultiOpsTxnsStressTest::Record::DecodePrimaryIndexValue(
Slice primary_index_value) {
if (primary_index_value.size() != 8) {
return std::tuple<Status, uint32_t, uint32_t>{Status::Corruption(""), 0, 0};
}
uint32_t b = 0;
uint32_t c = 0;
if (!GetFixed32(&primary_index_value, &b) ||
!GetFixed32(&primary_index_value, &c)) {
assert(false);
return std::tuple<Status, uint32_t, uint32_t>{Status::Corruption(""), 0, 0};
}
return std::tuple<Status, uint32_t, uint32_t>{Status::OK(), b, c};
}
std::pair<Status, uint32_t>
MultiOpsTxnsStressTest::Record::DecodeSecondaryIndexValue(
Slice secondary_index_value) {
if (secondary_index_value.size() != 4) {
return std::make_pair(Status::Corruption(""), 0);
}
uint32_t crc = 0;
bool result __attribute__((unused)) =
GetFixed32(&secondary_index_value, &crc);
assert(result);
return std::make_pair(Status::OK(), crc);
}
std::pair<std::string, std::string>
MultiOpsTxnsStressTest::Record::EncodePrimaryIndexEntry() const {
std::string primary_index_key = EncodePrimaryKey();
std::string primary_index_value = EncodePrimaryIndexValue();
return std::make_pair(primary_index_key, primary_index_value);
}
std::string MultiOpsTxnsStressTest::Record::EncodePrimaryKey() const {
return EncodePrimaryKey(a_);
}
std::string MultiOpsTxnsStressTest::Record::EncodePrimaryIndexValue() const {
std::string ret;
PutFixed32(&ret, b_);
PutFixed32(&ret, c_);
return ret;
}
std::pair<std::string, std::string>
MultiOpsTxnsStressTest::Record::EncodeSecondaryIndexEntry() const {
std::string secondary_index_key = EncodeSecondaryKey(c_, a_);
// Secondary index value is always 4-byte crc32 of the secondary key
std::string secondary_index_value;
uint32_t crc =
crc32c::Value(secondary_index_key.data(), secondary_index_key.size());
PutFixed32(&secondary_index_value, crc);
return std::make_pair(std::move(secondary_index_key), secondary_index_value);
}
std::string MultiOpsTxnsStressTest::Record::EncodeSecondaryKey() const {
return EncodeSecondaryKey(c_, a_);
}
Status MultiOpsTxnsStressTest::Record::DecodePrimaryIndexEntry(
Slice primary_index_key, Slice primary_index_value) {
if (primary_index_key.size() != 8) {
assert(false);
return Status::Corruption("Primary index key length is not 8");
}
uint32_t index_id = 0;
[[maybe_unused]] bool res = GetFixed32(&primary_index_key, &index_id);
assert(res);
index_id = EndianSwapValue(index_id);
if (index_id != kPrimaryIndexId) {
std::ostringstream oss;
oss << "Unexpected primary index id: " << index_id;
return Status::Corruption(oss.str());
}
res = GetFixed32(&primary_index_key, &a_);
assert(res);
a_ = EndianSwapValue(a_);
assert(primary_index_key.empty());
if (primary_index_value.size() != 8) {
return Status::Corruption("Primary index value length is not 8");
}
GetFixed32(&primary_index_value, &b_);
GetFixed32(&primary_index_value, &c_);
return Status::OK();
}
Status MultiOpsTxnsStressTest::Record::DecodeSecondaryIndexEntry(
Slice secondary_index_key, Slice secondary_index_value) {
if (secondary_index_key.size() != 12) {
return Status::Corruption("Secondary index key length is not 12");
}
uint32_t crc =
crc32c::Value(secondary_index_key.data(), secondary_index_key.size());
uint32_t index_id = 0;
[[maybe_unused]] bool res = GetFixed32(&secondary_index_key, &index_id);
assert(res);
index_id = EndianSwapValue(index_id);
if (index_id != kSecondaryIndexId) {
std::ostringstream oss;
oss << "Unexpected secondary index id: " << index_id;
return Status::Corruption(oss.str());
}
assert(secondary_index_key.size() == 8);
res = GetFixed32(&secondary_index_key, &c_);
assert(res);
c_ = EndianSwapValue(c_);
assert(secondary_index_key.size() == 4);
res = GetFixed32(&secondary_index_key, &a_);
assert(res);
a_ = EndianSwapValue(a_);
assert(secondary_index_key.empty());
if (secondary_index_value.size() != 4) {
return Status::Corruption("Secondary index value length is not 4");
}
uint32_t val = 0;
GetFixed32(&secondary_index_value, &val);
if (val != crc) {
std::ostringstream oss;
oss << "Secondary index key checksum mismatch, stored: " << val
<< ", recomputed: " << crc;
return Status::Corruption(oss.str());
}
return Status::OK();
}
void MultiOpsTxnsStressTest::FinishInitDb(SharedState* shared) {
if (FLAGS_enable_compaction_filter) {
// TODO (yanqin) enable compaction filter
}
ProcessRecoveredPreparedTxns(shared);
ReopenAndPreloadDbIfNeeded(shared);
// TODO (yanqin) parallelize if key space is large
for (auto& key_gen : key_gen_for_a_) {
assert(key_gen);
key_gen->FinishInit();
}
// TODO (yanqin) parallelize if key space is large
for (auto& key_gen : key_gen_for_c_) {
assert(key_gen);
key_gen->FinishInit();
}
}
void MultiOpsTxnsStressTest::ReopenAndPreloadDbIfNeeded(SharedState* shared) {
(void)shared;
bool db_empty = false;
{
std::unique_ptr<Iterator> iter(db_->NewIterator(ReadOptions()));
iter->SeekToFirst();
if (!iter->Valid()) {
db_empty = true;
}
}
if (db_empty) {
PreloadDb(shared, FLAGS_threads, FLAGS_lb_a, FLAGS_ub_a, FLAGS_lb_c,
FLAGS_ub_c);
} else {
fprintf(stdout,
"Key ranges will be read from %s.\n-lb_a, -ub_a, -lb_c, -ub_c will "
"be ignored\n",
FLAGS_key_spaces_path.c_str());
fflush(stdout);
ScanExistingDb(shared, FLAGS_threads);
}
}
// Used for point-lookup transaction
Status MultiOpsTxnsStressTest::TestGet(
ThreadState* thread, const ReadOptions& read_opts,
const std::vector<int>& /*rand_column_families*/,
const std::vector<int64_t>& /*rand_keys*/) {
uint32_t a = 0;
uint32_t pos = 0;
std::tie(a, pos) = ChooseExistingA(thread);
return PointLookupTxn(thread, read_opts, a);
}
// Not used.
std::vector<Status> MultiOpsTxnsStressTest::TestMultiGet(
ThreadState* /*thread*/, const ReadOptions& /*read_opts*/,
const std::vector<int>& /*rand_column_families*/,
const std::vector<int64_t>& /*rand_keys*/) {
return std::vector<Status>{Status::NotSupported()};
}
// Wide columns are currently not supported by transactions.
void MultiOpsTxnsStressTest::TestGetEntity(
ThreadState* /* thread */, const ReadOptions& /* read_opts */,
const std::vector<int>& /* rand_column_families */,
const std::vector<int64_t>& /* rand_keys */) {}
// Wide columns are currently not supported by transactions.
void MultiOpsTxnsStressTest::TestMultiGetEntity(
ThreadState* /* thread */, const ReadOptions& /* read_opts */,
const std::vector<int>& /* rand_column_families */,
const std::vector<int64_t>& /* rand_keys */) {}
Status MultiOpsTxnsStressTest::TestPrefixScan(
ThreadState* thread, const ReadOptions& read_opts,
const std::vector<int>& rand_column_families,
const std::vector<int64_t>& rand_keys) {
(void)thread;
(void)read_opts;
(void)rand_column_families;
(void)rand_keys;
return Status::OK();
}
// Given a key K, this creates an iterator which scans to K and then
// does a random sequence of Next/Prev operations.
Status MultiOpsTxnsStressTest::TestIterate(
ThreadState* thread, const ReadOptions& read_opts,
const std::vector<int>& /*rand_column_families*/,
const std::vector<int64_t>& /*rand_keys*/) {
uint32_t c = 0;
uint32_t pos = 0;
std::tie(c, pos) = ChooseExistingC(thread);
return RangeScanTxn(thread, read_opts, c);
}
// Not intended for use.
Status MultiOpsTxnsStressTest::TestPut(ThreadState* /*thread*/,
WriteOptions& /*write_opts*/,
const ReadOptions& /*read_opts*/,
const std::vector<int>& /*cf_ids*/,
const std::vector<int64_t>& /*keys*/,
char (&value)[100]) {
(void)value;
return Status::NotSupported();
}
// Not intended for use.
Status MultiOpsTxnsStressTest::TestDelete(
ThreadState* /*thread*/, WriteOptions& /*write_opts*/,
const std::vector<int>& /*rand_column_families*/,
const std::vector<int64_t>& /*rand_keys*/) {
return Status::NotSupported();
}
// Not intended for use.
Status MultiOpsTxnsStressTest::TestDeleteRange(
ThreadState* /*thread*/, WriteOptions& /*write_opts*/,
const std::vector<int>& /*rand_column_families*/,
const std::vector<int64_t>& /*rand_keys*/) {
return Status::NotSupported();
}
void MultiOpsTxnsStressTest::TestIngestExternalFile(
ThreadState* thread, const std::vector<int>& rand_column_families,
const std::vector<int64_t>& /*rand_keys*/) {
// TODO (yanqin)
(void)thread;
(void)rand_column_families;
}
void MultiOpsTxnsStressTest::TestCompactRange(
ThreadState* thread, int64_t /*rand_key*/, const Slice& /*start_key*/,
ColumnFamilyHandle* column_family) {
// TODO (yanqin).
// May use GetRangeHash() for validation before and after DB::CompactRange()
// completes.
(void)thread;
(void)column_family;
}
Status MultiOpsTxnsStressTest::TestBackupRestore(
ThreadState* thread, const std::vector<int>& rand_column_families,
const std::vector<int64_t>& /*rand_keys*/) {
// TODO (yanqin)
(void)thread;
(void)rand_column_families;
return Status::OK();
}
Status MultiOpsTxnsStressTest::TestCheckpoint(
ThreadState* thread, const std::vector<int>& rand_column_families,
const std::vector<int64_t>& /*rand_keys*/) {
// TODO (yanqin)
(void)thread;
(void)rand_column_families;
return Status::OK();
}
Status MultiOpsTxnsStressTest::TestApproximateSize(
ThreadState* thread, uint64_t iteration,
const std::vector<int>& rand_column_families,
const std::vector<int64_t>& /*rand_keys*/) {
// TODO (yanqin)
(void)thread;
(void)iteration;
(void)rand_column_families;
return Status::OK();
}
Status MultiOpsTxnsStressTest::TestCustomOperations(
ThreadState* thread, const std::vector<int>& rand_column_families) {
(void)rand_column_families;
// Randomly choose from 0, 1, and 2.
// TODO (yanqin) allow user to configure probability of each operation.
uint32_t rand = thread->rand.Uniform(3);
Status s;
if (0 == rand) {
// Update primary key.
uint32_t old_a = 0;
uint32_t pos = 0;
std::tie(old_a, pos) = ChooseExistingA(thread);
uint32_t new_a = GenerateNextA(thread);
s = PrimaryKeyUpdateTxn(thread, old_a, pos, new_a);
} else if (1 == rand) {
// Update secondary key.
uint32_t old_c = 0;
uint32_t pos = 0;
std::tie(old_c, pos) = ChooseExistingC(thread);
uint32_t new_c = GenerateNextC(thread);
s = SecondaryKeyUpdateTxn(thread, old_c, pos, new_c);
} else if (2 == rand) {
// Update primary index value.
uint32_t a = 0;
uint32_t pos = 0;
std::tie(a, pos) = ChooseExistingA(thread);
s = UpdatePrimaryIndexValueTxn(thread, a, /*b_delta=*/1);
} else {
// Should never reach here.
assert(false);
}
return s;
}
void MultiOpsTxnsStressTest::RegisterAdditionalListeners() {
options_.listeners.emplace_back(new MultiOpsTxnsStressListener(this));
}
void MultiOpsTxnsStressTest::PrepareTxnDbOptions(
SharedState* /*shared*/, TransactionDBOptions& txn_db_opts) {
// MultiOpsTxnStressTest uses SingleDelete to delete secondary keys, thus we
// register this callback to let TxnDb know that when rolling back
// a transaction, use only SingleDelete to cancel prior Put from the same
// transaction if applicable.
txn_db_opts.rollback_deletion_type_callback =
[](TransactionDB* /*db*/, ColumnFamilyHandle* /*column_family*/,
const Slice& key) {
Slice ks = key;
uint32_t index_id = 0;
[[maybe_unused]] bool res = GetFixed32(&ks, &index_id);
assert(res);
index_id = EndianSwapValue(index_id);
assert(index_id <= Record::kSecondaryIndexId);
return index_id == Record::kSecondaryIndexId;
};
}
Status MultiOpsTxnsStressTest::PrimaryKeyUpdateTxn(ThreadState* thread,
uint32_t old_a,
uint32_t old_a_pos,
uint32_t new_a) {
std::string old_pk = Record::EncodePrimaryKey(old_a);
std::string new_pk = Record::EncodePrimaryKey(new_a);
Transaction* txn = nullptr;
WriteOptions wopts;
Status s = NewTxn(wopts, &txn);
if (!s.ok()) {
assert(!txn);
thread->stats.AddErrors(1);
return s;
}
assert(txn);
txn->SetSnapshotOnNextOperation(/*notifier=*/nullptr);
const Defer cleanup([new_a, &s, thread, txn, this]() {
if (s.ok()) {
// Two gets, one for existing pk, one for locking potential new pk.
thread->stats.AddGets(/*ngets=*/2, /*nfounds=*/1);
thread->stats.AddDeletes(1);
thread->stats.AddBytesForWrites(
/*nwrites=*/2,
Record::kPrimaryIndexEntrySize + Record::kSecondaryIndexEntrySize);
thread->stats.AddSingleDeletes(1);
return;
}
if (s.IsNotFound()) {
thread->stats.AddGets(/*ngets=*/1, /*nfounds=*/0);
} else if (s.IsBusy() || s.IsIncomplete()) {
// ignore.
// Incomplete also means rollback by application. See the transaction
// implementations.
} else {
thread->stats.AddErrors(1);
}
auto& key_gen = key_gen_for_a_[thread->tid];
key_gen->UndoAllocation(new_a);
RollbackTxn(txn).PermitUncheckedError();
});
ReadOptions ropts;
ropts.rate_limiter_priority =
FLAGS_rate_limit_user_ops ? Env::IO_USER : Env::IO_TOTAL;
std::string value;
s = txn->GetForUpdate(ropts, old_pk, &value);
if (!s.ok()) {
return s;
}
std::string empty_value;
s = txn->GetForUpdate(ropts, new_pk, &empty_value);
if (s.ok()) {
assert(!empty_value.empty());
s = Status::Busy();
return s;
} else if (!s.IsNotFound()) {
return s;
}
auto result = Record::DecodePrimaryIndexValue(value);
s = std::get<0>(result);
if (!s.ok()) {
return s;
}
uint32_t b = std::get<1>(result);
uint32_t c = std::get<2>(result);
ColumnFamilyHandle* cf = db_->DefaultColumnFamily();
s = txn->Delete(cf, old_pk, /*assume_tracked=*/true);
if (!s.ok()) {
return s;
}
s = txn->Put(cf, new_pk, value, /*assume_tracked=*/true);
if (!s.ok()) {
return s;
}
auto* wb = txn->GetWriteBatch();
assert(wb);
std::string old_sk = Record::EncodeSecondaryKey(c, old_a);
s = wb->SingleDelete(old_sk);
if (!s.ok()) {
return s;
}
Record record(new_a, b, c);
std::string new_sk;
std::string new_crc;
std::tie(new_sk, new_crc) = record.EncodeSecondaryIndexEntry();
s = wb->Put(new_sk, new_crc);
if (!s.ok()) {
return s;
}
s = txn->Prepare();
if (!s.ok()) {
return s;
}
if (FLAGS_rollback_one_in > 0 && thread->rand.OneIn(FLAGS_rollback_one_in)) {
s = Status::Incomplete();
return s;
}
s = WriteToCommitTimeWriteBatch(*txn);
if (!s.ok()) {
return s;
}
s = CommitAndCreateTimestampedSnapshotIfNeeded(thread, *txn);
auto& key_gen = key_gen_for_a_.at(thread->tid);
if (s.ok()) {
delete txn;
key_gen->Replace(old_a, old_a_pos, new_a);
}
return s;
}
Status MultiOpsTxnsStressTest::SecondaryKeyUpdateTxn(ThreadState* thread,
uint32_t old_c,
uint32_t old_c_pos,
uint32_t new_c) {
Transaction* txn = nullptr;
WriteOptions wopts;
Status s = NewTxn(wopts, &txn);
if (!s.ok()) {
assert(!txn);
thread->stats.AddErrors(1);
return s;
}
assert(txn);
Iterator* it = nullptr;
long iterations = 0;
const Defer cleanup([new_c, &s, thread, &it, txn, this, &iterations]() {
delete it;
if (s.ok()) {
thread->stats.AddIterations(iterations);
thread->stats.AddGets(/*ngets=*/1, /*nfounds=*/1);
thread->stats.AddSingleDeletes(1);
thread->stats.AddBytesForWrites(
/*nwrites=*/2,
Record::kPrimaryIndexEntrySize + Record::kSecondaryIndexEntrySize);
return;
} else if (s.IsBusy() || s.IsTimedOut() || s.IsTryAgain() ||
s.IsMergeInProgress() || s.IsIncomplete()) {
// ww-conflict detected, or
// lock cannot be acquired, or
// memtable history is not large enough for conflict checking, or
// Merge operation cannot be resolved, or
// application rollback.
// TODO (yanqin) add stats for other cases?
} else if (s.IsNotFound()) {
// ignore.
} else {
thread->stats.AddErrors(1);
}
auto& key_gen = key_gen_for_c_[thread->tid];
key_gen->UndoAllocation(new_c);
RollbackTxn(txn).PermitUncheckedError();
});
// TODO (yanqin) try SetSnapshotOnNextOperation(). We currently need to take
// a snapshot here because we will later verify that point lookup in the
// primary index using GetForUpdate() returns the same value for 'c' as the
// iterator. The iterator does not need a snapshot though, because it will be
// assigned the current latest (published) sequence in the db, which will be
// no smaller than the snapshot created here. The GetForUpdate will perform
// ww conflict checking to ensure GetForUpdate() (using the snapshot) sees
// the same data as this iterator.
txn->SetSnapshot();
std::string old_sk_prefix = Record::EncodeSecondaryKey(old_c);
std::string iter_ub_str = Record::EncodeSecondaryKey(old_c + 1);
Slice iter_ub = iter_ub_str;
ReadOptions ropts;
ropts.snapshot = txn->GetSnapshot();
ropts.total_order_seek = true;
ropts.iterate_upper_bound = &iter_ub;
ropts.rate_limiter_priority =
FLAGS_rate_limit_user_ops ? Env::IO_USER : Env::IO_TOTAL;
it = txn->GetIterator(ropts);
assert(it);
it->Seek(old_sk_prefix);
if (!it->Valid()) {
s = Status::NotFound();
return s;
}
auto* wb = txn->GetWriteBatch();
assert(wb);
do {
++iterations;
Record record;
s = record.DecodeSecondaryIndexEntry(it->key(), it->value());
if (!s.ok()) {
fprintf(stderr, "Cannot decode secondary key (%s => %s): %s\n",
it->key().ToString(true).c_str(),
it->value().ToString(true).c_str(), s.ToString().c_str());
assert(false);
break;
}
// At this point, record.b is not known yet, thus we need to access
// primary index.
std::string pk = Record::EncodePrimaryKey(record.a_value());
std::string value;
ReadOptions read_opts;
read_opts.rate_limiter_priority =
FLAGS_rate_limit_user_ops ? Env::IO_USER : Env::IO_TOTAL;
read_opts.snapshot = txn->GetSnapshot();
s = txn->GetForUpdate(read_opts, pk, &value);
if (s.IsBusy() || s.IsTimedOut() || s.IsTryAgain() ||
s.IsMergeInProgress()) {
// Write conflict, or cannot acquire lock, or memtable size is not large
// enough, or merge cannot be resolved.
break;
} else if (s.IsNotFound()) {
// We can also fail verification here.
std::ostringstream oss;
auto* dbimpl = static_cast_with_check<DBImpl>(db_->GetRootDB());
assert(dbimpl);
oss << "snap " << read_opts.snapshot->GetSequenceNumber()
<< " (published " << dbimpl->GetLastPublishedSequence()
<< "), pk should exist: " << Slice(pk).ToString(true);
fprintf(stderr, "%s\n", oss.str().c_str());
assert(false);
break;
}
if (!s.ok()) {
std::ostringstream oss;
auto* dbimpl = static_cast_with_check<DBImpl>(db_->GetRootDB());
assert(dbimpl);
oss << "snap " << read_opts.snapshot->GetSequenceNumber()
<< " (published " << dbimpl->GetLastPublishedSequence() << "), "
<< s.ToString();
fprintf(stderr, "%s\n", oss.str().c_str());
assert(false);
break;
}
auto result = Record::DecodePrimaryIndexValue(value);
s = std::get<0>(result);
if (!s.ok()) {
fprintf(stderr, "Cannot decode primary index value %s: %s\n",
Slice(value).ToString(true).c_str(), s.ToString().c_str());
assert(false);
break;
}
uint32_t b = std::get<1>(result);
uint32_t c = std::get<2>(result);
if (c != old_c) {
std::ostringstream oss;
auto* dbimpl = static_cast_with_check<DBImpl>(db_->GetRootDB());
assert(dbimpl);
oss << "snap " << read_opts.snapshot->GetSequenceNumber()
<< " (published " << dbimpl->GetLastPublishedSequence()
<< "), pk/sk mismatch. pk: (a=" << record.a_value() << ", "
<< "c=" << c << "), sk: (c=" << old_c << ")";
s = Status::Corruption();
fprintf(stderr, "%s\n", oss.str().c_str());
assert(false);
break;
}
Record new_rec(record.a_value(), b, new_c);
std::string new_primary_index_value = new_rec.EncodePrimaryIndexValue();
ColumnFamilyHandle* cf = db_->DefaultColumnFamily();
s = txn->Put(cf, pk, new_primary_index_value, /*assume_tracked=*/true);
if (!s.ok()) {
break;
}
std::string old_sk = it->key().ToString(/*hex=*/false);
std::string new_sk;
std::string new_crc;
std::tie(new_sk, new_crc) = new_rec.EncodeSecondaryIndexEntry();
s = wb->SingleDelete(old_sk);
if (!s.ok()) {
break;
}
s = wb->Put(new_sk, new_crc);
if (!s.ok()) {
break;
}
it->Next();
} while (it->Valid());
if (!s.ok()) {
return s;
}
s = txn->Prepare();
if (!s.ok()) {
return s;
}
if (FLAGS_rollback_one_in > 0 && thread->rand.OneIn(FLAGS_rollback_one_in)) {
s = Status::Incomplete();
return s;
}
s = WriteToCommitTimeWriteBatch(*txn);
if (!s.ok()) {
return s;
}
s = CommitAndCreateTimestampedSnapshotIfNeeded(thread, *txn);
if (s.ok()) {
delete txn;
auto& key_gen = key_gen_for_c_.at(thread->tid);
key_gen->Replace(old_c, old_c_pos, new_c);
}
return s;
}
Status MultiOpsTxnsStressTest::UpdatePrimaryIndexValueTxn(ThreadState* thread,
uint32_t a,
uint32_t b_delta) {
std::string pk_str = Record::EncodePrimaryKey(a);
Transaction* txn = nullptr;
WriteOptions wopts;
Status s = NewTxn(wopts, &txn);
if (!s.ok()) {
assert(!txn);
thread->stats.AddErrors(1);
return s;
}
assert(txn);
const Defer cleanup([&s, thread, txn, this]() {
if (s.ok()) {
thread->stats.AddGets(/*ngets=*/1, /*nfounds=*/1);
thread->stats.AddBytesForWrites(
/*nwrites=*/1, /*nbytes=*/Record::kPrimaryIndexEntrySize);
return;
}
if (s.IsNotFound()) {
thread->stats.AddGets(/*ngets=*/1, /*nfounds=*/0);
} else if (s.IsInvalidArgument()) {
// ignored.
} else if (s.IsBusy() || s.IsTimedOut() || s.IsTryAgain() ||
s.IsMergeInProgress() || s.IsIncomplete()) {
// ignored.
} else {
thread->stats.AddErrors(1);
}
RollbackTxn(txn).PermitUncheckedError();
});
ReadOptions ropts;
ropts.rate_limiter_priority =
FLAGS_rate_limit_user_ops ? Env::IO_USER : Env::IO_TOTAL;
std::string value;
s = txn->GetForUpdate(ropts, pk_str, &value);
if (!s.ok()) {
return s;
}
auto result = Record::DecodePrimaryIndexValue(value);
if (!std::get<0>(result).ok()) {
s = std::get<0>(result);
fprintf(stderr, "Cannot decode primary index value %s: %s\n",
Slice(value).ToString(true).c_str(), s.ToString().c_str());
assert(false);
return s;
}
uint32_t b = std::get<1>(result) + b_delta;
uint32_t c = std::get<2>(result);
Record record(a, b, c);
std::string primary_index_value = record.EncodePrimaryIndexValue();
ColumnFamilyHandle* cf = db_->DefaultColumnFamily();
s = txn->Put(cf, pk_str, primary_index_value, /*assume_tracked=*/true);
if (!s.ok()) {
return s;
}
s = txn->Prepare();
if (!s.ok()) {
return s;
}
if (FLAGS_rollback_one_in > 0 && thread->rand.OneIn(FLAGS_rollback_one_in)) {
s = Status::Incomplete();
return s;
}
s = WriteToCommitTimeWriteBatch(*txn);
if (!s.ok()) {
return s;
}
s = CommitAndCreateTimestampedSnapshotIfNeeded(thread, *txn);
if (s.ok()) {
delete txn;
}
return s;
}
Status MultiOpsTxnsStressTest::PointLookupTxn(ThreadState* thread,
ReadOptions ropts, uint32_t a) {
std::string pk_str = Record::EncodePrimaryKey(a);
// pk may or may not exist
PinnableSlice value;
Transaction* txn = nullptr;
WriteOptions wopts;
Status s = NewTxn(wopts, &txn);
if (!s.ok()) {
assert(!txn);
thread->stats.AddErrors(1);
return s;
}
assert(txn);
const Defer cleanup([&s, thread, txn, this]() {
if (s.ok()) {
thread->stats.AddGets(/*ngets=*/1, /*nfounds=*/1);
return;
} else if (s.IsNotFound()) {
thread->stats.AddGets(/*ngets=*/1, /*nfounds=*/0);
} else {
thread->stats.AddErrors(1);
}
RollbackTxn(txn).PermitUncheckedError();
});
std::shared_ptr<const Snapshot> snapshot;
SetupSnapshot(thread, ropts, *txn, snapshot);
if (FLAGS_delay_snapshot_read_one_in > 0 &&
thread->rand.OneIn(FLAGS_delay_snapshot_read_one_in)) {
uint64_t delay_ms = thread->rand.Uniform(100) + 1;
db_->GetDBOptions().env->SleepForMicroseconds(
static_cast<int>(delay_ms * 1000));
}
s = txn->Get(ropts, db_->DefaultColumnFamily(), pk_str, &value);
if (s.ok()) {
s = txn->Commit();
}
if (s.ok()) {
delete txn;
}
return s;
}
Status MultiOpsTxnsStressTest::RangeScanTxn(ThreadState* thread,
ReadOptions ropts, uint32_t c) {
std::string sk = Record::EncodeSecondaryKey(c);
Transaction* txn = nullptr;
WriteOptions wopts;
Status s = NewTxn(wopts, &txn);
if (!s.ok()) {
assert(!txn);
thread->stats.AddErrors(1);
return s;
}
assert(txn);
const Defer cleanup([&s, thread, txn, this]() {
if (s.ok()) {
thread->stats.AddIterations(1);
return;
}
thread->stats.AddErrors(1);
RollbackTxn(txn).PermitUncheckedError();
});
std::shared_ptr<const Snapshot> snapshot;
SetupSnapshot(thread, ropts, *txn, snapshot);
if (FLAGS_delay_snapshot_read_one_in > 0 &&
thread->rand.OneIn(FLAGS_delay_snapshot_read_one_in)) {
uint64_t delay_ms = thread->rand.Uniform(100) + 1;
db_->GetDBOptions().env->SleepForMicroseconds(
static_cast<int>(delay_ms * 1000));
}
std::unique_ptr<Iterator> iter(txn->GetIterator(ropts));
constexpr size_t total_nexts = 10;
size_t nexts = 0;
for (iter->Seek(sk);
iter->Valid() && nexts < total_nexts && iter->status().ok();
iter->Next(), ++nexts) {
}
if (iter->status().ok()) {
s = txn->Commit();
} else {
s = iter->status();
}
if (s.ok()) {
delete txn;
}
return s;
}
void MultiOpsTxnsStressTest::VerifyDb(ThreadState* thread) const {
if (thread->shared->HasVerificationFailedYet()) {
return;
}
const Snapshot* const snapshot = db_->GetSnapshot();
assert(snapshot);
ManagedSnapshot snapshot_guard(db_, snapshot);
std::ostringstream oss;
oss << "[snap=" << snapshot->GetSequenceNumber() << ",";
auto* dbimpl = static_cast_with_check<DBImpl>(db_->GetRootDB());
assert(dbimpl);
oss << " last_published=" << dbimpl->GetLastPublishedSequence() << "] ";
if (FLAGS_delay_snapshot_read_one_in > 0 &&
thread->rand.OneIn(FLAGS_delay_snapshot_read_one_in)) {
uint64_t delay_ms = thread->rand.Uniform(100) + 1;
db_->GetDBOptions().env->SleepForMicroseconds(
static_cast<int>(delay_ms * 1000));
}
// TODO (yanqin) with a probability, we can use either forward or backward
// iterator in subsequent checks. We can also use more advanced features in
// range scan. For now, let's just use simple forward iteration with
// total_order_seek = true.
// First, iterate primary index.
size_t primary_index_entries_count = 0;
{
std::string iter_ub_str;
PutFixed32(&iter_ub_str, Record::kPrimaryIndexId + 1);
std::reverse(iter_ub_str.begin(), iter_ub_str.end());
Slice iter_ub = iter_ub_str;
std::string start_key;
PutFixed32(&start_key, Record::kPrimaryIndexId);
std::reverse(start_key.begin(), start_key.end());
// This `ReadOptions` is for validation purposes. Ignore
// `FLAGS_rate_limit_user_ops` to avoid slowing any validation.
ReadOptions ropts;
ropts.snapshot = snapshot;
ropts.total_order_seek = true;
ropts.iterate_upper_bound = &iter_ub;
std::unique_ptr<Iterator> it(db_->NewIterator(ropts));
for (it->Seek(start_key); it->Valid(); it->Next()) {
Record record;
Status s = record.DecodePrimaryIndexEntry(it->key(), it->value());
if (!s.ok()) {
oss << "Cannot decode primary index entry " << it->key().ToString(true)
<< "=>" << it->value().ToString(true);
VerificationAbort(thread->shared, oss.str(), s);
assert(false);
return;
}
++primary_index_entries_count;
// Search secondary index.
uint32_t a = record.a_value();
uint32_t c = record.c_value();
char sk_buf[12];
EncodeFixed32(sk_buf, Record::kSecondaryIndexId);
std::reverse(sk_buf, sk_buf + sizeof(uint32_t));
EncodeFixed32(sk_buf + sizeof(uint32_t), c);
std::reverse(sk_buf + sizeof(uint32_t), sk_buf + 2 * sizeof(uint32_t));
EncodeFixed32(sk_buf + 2 * sizeof(uint32_t), a);
std::reverse(sk_buf + 2 * sizeof(uint32_t), sk_buf + sizeof(sk_buf));
Slice sk(sk_buf, sizeof(sk_buf));
std::string value;
s = db_->Get(ropts, sk, &value);
if (!s.ok()) {
oss << "Cannot find secondary index entry " << sk.ToString(true);
VerificationAbort(thread->shared, oss.str(), s);
assert(false);
return;
}
}
}
// Second, iterate secondary index.
size_t secondary_index_entries_count = 0;
{
std::string start_key;
PutFixed32(&start_key, Record::kSecondaryIndexId);
std::reverse(start_key.begin(), start_key.end());
// This `ReadOptions` is for validation purposes. Ignore
// `FLAGS_rate_limit_user_ops` to avoid slowing any validation.
ReadOptions ropts;
ropts.snapshot = snapshot;
ropts.total_order_seek = true;
std::unique_ptr<Iterator> it(db_->NewIterator(ropts));
for (it->Seek(start_key); it->Valid(); it->Next()) {
++secondary_index_entries_count;
Record record;
Status s = record.DecodeSecondaryIndexEntry(it->key(), it->value());
if (!s.ok()) {
oss << "Cannot decode secondary index entry "
<< it->key().ToString(true) << "=>" << it->value().ToString(true);
VerificationAbort(thread->shared, oss.str(), s);
assert(false);
return;
}
// After decoding secondary index entry, we know a and c. Crc is verified
// in decoding phase.
//
// Form a primary key and search in the primary index.
std::string pk = Record::EncodePrimaryKey(record.a_value());
std::string value;
s = db_->Get(ropts, pk, &value);
if (!s.ok()) {
oss << "Error searching pk " << Slice(pk).ToString(true) << ". "
<< s.ToString() << ". sk " << it->key().ToString(true);
VerificationAbort(thread->shared, oss.str(), s);
assert(false);
return;
}
auto result = Record::DecodePrimaryIndexValue(value);
s = std::get<0>(result);
if (!s.ok()) {
oss << "Error decoding primary index value "
<< Slice(value).ToString(true) << ". " << s.ToString();
VerificationAbort(thread->shared, oss.str(), s);
assert(false);
return;
}
uint32_t c_in_primary = std::get<2>(result);
if (c_in_primary != record.c_value()) {
oss << "Pk/sk mismatch. pk: " << Slice(pk).ToString(true) << "=>"
<< Slice(value).ToString(true) << " (a=" << record.a_value()
<< ", c=" << c_in_primary << "), sk: " << it->key().ToString(true)
<< " (c=" << record.c_value() << ")";
VerificationAbort(thread->shared, oss.str(), s);
assert(false);
return;
}
}
}
if (secondary_index_entries_count != primary_index_entries_count) {
oss << "Pk/sk mismatch: primary index has " << primary_index_entries_count
<< " entries. Secondary index has " << secondary_index_entries_count
<< " entries.";
VerificationAbort(thread->shared, oss.str(), Status::OK());
assert(false);
return;
}
}
// VerifyPkSkFast() can be called by MultiOpsTxnsStressListener's callbacks
// which can be called before TransactionDB::Open() returns to caller.
// Therefore, at that time, db_ and txn_db_ may still be nullptr.
// Caller has to make sure that the race condition does not happen.
void MultiOpsTxnsStressTest::VerifyPkSkFast(int job_id) {
DB* const db = db_aptr_.load(std::memory_order_acquire);
if (db == nullptr) {
return;
}
assert(db_ == db);
assert(db_ != nullptr);
const Snapshot* const snapshot = db_->GetSnapshot();
assert(snapshot);
ManagedSnapshot snapshot_guard(db_, snapshot);
std::ostringstream oss;
auto* dbimpl = static_cast_with_check<DBImpl>(db_->GetRootDB());
assert(dbimpl);
oss << "Job " << job_id << ": [" << snapshot->GetSequenceNumber() << ","
<< dbimpl->GetLastPublishedSequence() << "] ";
std::string start_key;
PutFixed32(&start_key, Record::kSecondaryIndexId);
std::reverse(start_key.begin(), start_key.end());
// This `ReadOptions` is for validation purposes. Ignore
// `FLAGS_rate_limit_user_ops` to avoid slowing any validation.
ReadOptions ropts;
ropts.snapshot = snapshot;
ropts.total_order_seek = true;
std::unique_ptr<Iterator> it(db_->NewIterator(ropts));
for (it->Seek(start_key); it->Valid(); it->Next()) {
Record record;
Status s = record.DecodeSecondaryIndexEntry(it->key(), it->value());
if (!s.ok()) {
oss << "Cannot decode secondary index entry " << it->key().ToString(true)
<< "=>" << it->value().ToString(true);
fprintf(stderr, "%s\n", oss.str().c_str());
fflush(stderr);
assert(false);
}
// After decoding secondary index entry, we know a and c. Crc is verified
// in decoding phase.
//
// Form a primary key and search in the primary index.
std::string pk = Record::EncodePrimaryKey(record.a_value());
std::string value;
s = db_->Get(ropts, pk, &value);
if (!s.ok()) {
oss << "Error searching pk " << Slice(pk).ToString(true) << ". "
<< s.ToString() << ". sk " << it->key().ToString(true);
fprintf(stderr, "%s\n", oss.str().c_str());
fflush(stderr);
assert(false);
}
auto result = Record::DecodePrimaryIndexValue(value);
s = std::get<0>(result);
if (!s.ok()) {
oss << "Error decoding primary index value "
<< Slice(value).ToString(true) << ". " << s.ToString();
fprintf(stderr, "%s\n", oss.str().c_str());
fflush(stderr);
assert(false);
}
uint32_t c_in_primary = std::get<2>(result);
if (c_in_primary != record.c_value()) {
oss << "Pk/sk mismatch. pk: " << Slice(pk).ToString(true) << "=>"
<< Slice(value).ToString(true) << " (a=" << record.a_value()
<< ", c=" << c_in_primary << "), sk: " << it->key().ToString(true)
<< " (c=" << record.c_value() << ")";
fprintf(stderr, "%s\n", oss.str().c_str());
fflush(stderr);
assert(false);
}
}
}
std::pair<uint32_t, uint32_t> MultiOpsTxnsStressTest::ChooseExistingA(
ThreadState* thread) {
uint32_t tid = thread->tid;
auto& key_gen = key_gen_for_a_.at(tid);
return key_gen->ChooseExisting();
}
uint32_t MultiOpsTxnsStressTest::GenerateNextA(ThreadState* thread) {
uint32_t tid = thread->tid;
auto& key_gen = key_gen_for_a_.at(tid);
return key_gen->Allocate();
}
std::pair<uint32_t, uint32_t> MultiOpsTxnsStressTest::ChooseExistingC(
ThreadState* thread) {
uint32_t tid = thread->tid;
auto& key_gen = key_gen_for_c_.at(tid);
return key_gen->ChooseExisting();
}
uint32_t MultiOpsTxnsStressTest::GenerateNextC(ThreadState* thread) {
uint32_t tid = thread->tid;
auto& key_gen = key_gen_for_c_.at(tid);
return key_gen->Allocate();
}
void MultiOpsTxnsStressTest::ProcessRecoveredPreparedTxnsHelper(
Transaction* txn, SharedState*) {
thread_local Random rand(static_cast<uint32_t>(FLAGS_seed));
if (rand.OneIn(2)) {
Status s = txn->Commit();
assert(s.ok());
} else {
Status s = txn->Rollback();
assert(s.ok());
}
}
Status MultiOpsTxnsStressTest::WriteToCommitTimeWriteBatch(Transaction& txn) {
WriteBatch* ctwb = txn.GetCommitTimeWriteBatch();
assert(ctwb);
// Do not change the content in key_buf.
static constexpr char key_buf[sizeof(Record::kMetadataPrefix) + 4] = {
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\xff'};
uint64_t counter_val = counter_.Next();
char val_buf[sizeof(counter_val)];
EncodeFixed64(val_buf, counter_val);
return ctwb->Put(Slice(key_buf, sizeof(key_buf)),
Slice(val_buf, sizeof(val_buf)));
}
Status MultiOpsTxnsStressTest::CommitAndCreateTimestampedSnapshotIfNeeded(
ThreadState* thread, Transaction& txn) {
Status s;
if (FLAGS_create_timestamped_snapshot_one_in > 0 &&
thread->rand.OneInOpt(FLAGS_create_timestamped_snapshot_one_in)) {
uint64_t ts = db_stress_env->NowNanos();
std::shared_ptr<const Snapshot> snapshot;
s = txn.CommitAndTryCreateSnapshot(/*notifier=*/nullptr, ts, &snapshot);
} else {
s = txn.Commit();
}
assert(txn_db_);
if (FLAGS_create_timestamped_snapshot_one_in > 0 &&
thread->rand.OneInOpt(50000)) {
uint64_t now = db_stress_env->NowNanos();
constexpr uint64_t time_diff = static_cast<uint64_t>(1000) * 1000 * 1000;
txn_db_->ReleaseTimestampedSnapshotsOlderThan(now - time_diff);
}
return s;
}
void MultiOpsTxnsStressTest::SetupSnapshot(
ThreadState* thread, ReadOptions& read_opts, Transaction& txn,
std::shared_ptr<const Snapshot>& snapshot) {
if (thread->rand.OneInOpt(2)) {
snapshot = txn_db_->GetLatestTimestampedSnapshot();
}
if (snapshot) {
read_opts.snapshot = snapshot.get();
} else {
txn.SetSnapshot();
read_opts.snapshot = txn.GetSnapshot();
}
}
std::string MultiOpsTxnsStressTest::KeySpaces::EncodeTo() const {
std::string result;
PutFixed32(&result, lb_a);
PutFixed32(&result, ub_a);
PutFixed32(&result, lb_c);
PutFixed32(&result, ub_c);
return result;
}
bool MultiOpsTxnsStressTest::KeySpaces::DecodeFrom(Slice data) {
if (!GetFixed32(&data, &lb_a) || !GetFixed32(&data, &ub_a) ||
!GetFixed32(&data, &lb_c) || !GetFixed32(&data, &ub_c)) {
return false;
}
return true;
}
void MultiOpsTxnsStressTest::PersistKeySpacesDesc(
const std::string& key_spaces_path, uint32_t lb_a, uint32_t ub_a,
uint32_t lb_c, uint32_t ub_c) {
KeySpaces key_spaces(lb_a, ub_a, lb_c, ub_c);
std::string key_spaces_rep = key_spaces.EncodeTo();
std::unique_ptr<WritableFile> wfile;
Status s1 =
Env::Default()->NewWritableFile(key_spaces_path, &wfile, EnvOptions());
assert(s1.ok());
assert(wfile);
s1 = wfile->Append(key_spaces_rep);
assert(s1.ok());
}
MultiOpsTxnsStressTest::KeySpaces MultiOpsTxnsStressTest::ReadKeySpacesDesc(
const std::string& key_spaces_path) {
KeySpaces key_spaces;
std::unique_ptr<SequentialFile> sfile;
Status s1 =
Env::Default()->NewSequentialFile(key_spaces_path, &sfile, EnvOptions());
assert(s1.ok());
assert(sfile);
char buf[16];
Slice result;
s1 = sfile->Read(sizeof(buf), &result, buf);
assert(s1.ok());
if (!key_spaces.DecodeFrom(result)) {
assert(false);
}
return key_spaces;
}
// Create an empty database if necessary and preload it with initial test data.
// Key range [lb_a, ub_a), [lb_c, ub_c). The key ranges will be shared by
// 'threads' threads.
// PreloadDb() also sets up KeyGenerator objects for each sub key range
// operated on by each thread.
// Both [lb_a, ub_a) and [lb_c, ub_c) are partitioned. Each thread operates on
// one sub range, using KeyGenerators to generate keys.
// For example, we choose a from [0, 10000) and c from [0, 100). Number of
// threads is 32, their tids range from 0 to 31.
// Thread k chooses a from [312*k,312*(k+1)) and c from [3*k,3*(k+1)) if k<31.
// Thread 31 chooses a from [9672, 10000) and c from [93, 100).
// Within each subrange: a from [low1, high1), c from [low2, high2).
// high1 - low1 > high2 - low2
// We reserve {high1 - 1} and {high2 - 1} as unallocated.
// The records are <low1,low2>, <low1+1,low2+1>, ...,
// <low1+k,low2+k%(high2-low2-1), <low1+k+1,low2+(k+1)%(high2-low2-1)>, ...
void MultiOpsTxnsStressTest::PreloadDb(SharedState* shared, int threads,
uint32_t lb_a, uint32_t ub_a,
uint32_t lb_c, uint32_t ub_c) {
key_gen_for_a_.resize(threads);
key_gen_for_c_.resize(threads);
assert(ub_a > lb_a && ub_a > lb_a + threads);
assert(ub_c > lb_c && ub_c > lb_c + threads);
PersistKeySpacesDesc(FLAGS_key_spaces_path, lb_a, ub_a, lb_c, ub_c);
fprintf(stdout, "a from [%u, %u), c from [%u, %u)\n",
static_cast<unsigned int>(lb_a), static_cast<unsigned int>(ub_a),
static_cast<unsigned int>(lb_c), static_cast<unsigned int>(ub_c));
const uint32_t num_c = ub_c - lb_c;
const uint32_t num_c_per_thread = num_c / threads;
const uint32_t num_a = ub_a - lb_a;
const uint32_t num_a_per_thread = num_a / threads;
WriteOptions wopts;
wopts.disableWAL = FLAGS_disable_wal;
Random rnd(shared->GetSeed());
assert(txn_db_);
std::vector<KeySet> existing_a_uniqs(threads);
std::vector<KeySet> non_existing_a_uniqs(threads);
std::vector<KeySet> existing_c_uniqs(threads);
std::vector<KeySet> non_existing_c_uniqs(threads);
for (uint32_t a = lb_a; a < ub_a; ++a) {
uint32_t tid = (a - lb_a) / num_a_per_thread;
if (tid >= static_cast<uint32_t>(threads)) {
tid = threads - 1;
}
uint32_t a_base = lb_a + tid * num_a_per_thread;
uint32_t a_hi = (tid < static_cast<uint32_t>(threads - 1))
? (a_base + num_a_per_thread)
: ub_a;
uint32_t a_delta = a - a_base;
if (a == a_hi - 1) {
non_existing_a_uniqs[tid].insert(a);
continue;
}
uint32_t c_base = lb_c + tid * num_c_per_thread;
uint32_t c_hi = (tid < static_cast<uint32_t>(threads - 1))
? (c_base + num_c_per_thread)
: ub_c;
uint32_t c_delta = a_delta % (c_hi - c_base - 1);
uint32_t c = c_base + c_delta;
uint32_t b = rnd.Next();
Record record(a, b, c);
WriteBatch wb;
const auto primary_index_entry = record.EncodePrimaryIndexEntry();
Status s = wb.Put(primary_index_entry.first, primary_index_entry.second);
assert(s.ok());
const auto secondary_index_entry = record.EncodeSecondaryIndexEntry();
s = wb.Put(secondary_index_entry.first, secondary_index_entry.second);
assert(s.ok());
s = txn_db_->Write(wopts, &wb);
assert(s.ok());
// TODO (yanqin): make the following check optional, especially when data
// size is large.
Record tmp_rec;
tmp_rec.SetB(record.b_value());
s = tmp_rec.DecodeSecondaryIndexEntry(secondary_index_entry.first,
secondary_index_entry.second);
assert(s.ok());
assert(tmp_rec == record);
existing_a_uniqs[tid].insert(a);
existing_c_uniqs[tid].insert(c);
}
for (int i = 0; i < threads; ++i) {
uint32_t my_seed = i + shared->GetSeed();
auto& key_gen_for_a = key_gen_for_a_[i];
assert(!key_gen_for_a);
uint32_t low = lb_a + i * num_a_per_thread;
uint32_t high = (i < threads - 1) ? (low + num_a_per_thread) : ub_a;
assert(existing_a_uniqs[i].size() == high - low - 1);
assert(non_existing_a_uniqs[i].size() == 1);
key_gen_for_a = std::make_unique<KeyGenerator>(
my_seed, low, high, std::move(existing_a_uniqs[i]),
std::move(non_existing_a_uniqs[i]));
auto& key_gen_for_c = key_gen_for_c_[i];
assert(!key_gen_for_c);
low = lb_c + i * num_c_per_thread;
high = (i < threads - 1) ? (low + num_c_per_thread) : ub_c;
non_existing_c_uniqs[i].insert(high - 1);
assert(existing_c_uniqs[i].size() == high - low - 1);
assert(non_existing_c_uniqs[i].size() == 1);
key_gen_for_c = std::make_unique<KeyGenerator>(
my_seed, low, high, std::move(existing_c_uniqs[i]),
std::move(non_existing_c_uniqs[i]));
}
}
// Scan an existing, non-empty database.
// Set up [lb_a, ub_a) and [lb_c, ub_c) as test key ranges.
// Set up KeyGenerator objects for each sub key range operated on by each
// thread.
// Scan the entire database and for each subrange, populate the existing keys
// and non-existing keys. We currently require the non-existing keys be
// non-empty after initialization.
void MultiOpsTxnsStressTest::ScanExistingDb(SharedState* shared, int threads) {
key_gen_for_a_.resize(threads);
key_gen_for_c_.resize(threads);
KeySpaces key_spaces = ReadKeySpacesDesc(FLAGS_key_spaces_path);
const uint32_t lb_a = key_spaces.lb_a;
const uint32_t ub_a = key_spaces.ub_a;
const uint32_t lb_c = key_spaces.lb_c;
const uint32_t ub_c = key_spaces.ub_c;
assert(lb_a < ub_a && lb_c < ub_c);
fprintf(stdout, "a from [%u, %u), c from [%u, %u)\n",
static_cast<unsigned int>(lb_a), static_cast<unsigned int>(ub_a),
static_cast<unsigned int>(lb_c), static_cast<unsigned int>(ub_c));
assert(ub_a > lb_a && ub_a > lb_a + threads);
assert(ub_c > lb_c && ub_c > lb_c + threads);
const uint32_t num_c = ub_c - lb_c;
const uint32_t num_c_per_thread = num_c / threads;
const uint32_t num_a = ub_a - lb_a;
const uint32_t num_a_per_thread = num_a / threads;
assert(db_);
ReadOptions ropts;
std::vector<KeySet> existing_a_uniqs(threads);
std::vector<KeySet> non_existing_a_uniqs(threads);
std::vector<KeySet> existing_c_uniqs(threads);
std::vector<KeySet> non_existing_c_uniqs(threads);
{
std::string pk_lb_str = Record::EncodePrimaryKey(0);
std::string pk_ub_str =
Record::EncodePrimaryKey(std::numeric_limits<uint32_t>::max());
Slice pk_lb = pk_lb_str;
Slice pk_ub = pk_ub_str;
ropts.iterate_lower_bound = &pk_lb;
ropts.iterate_upper_bound = &pk_ub;
ropts.total_order_seek = true;
std::unique_ptr<Iterator> it(db_->NewIterator(ropts));
for (it->SeekToFirst(); it->Valid(); it->Next()) {
Record record;
Status s = record.DecodePrimaryIndexEntry(it->key(), it->value());
if (!s.ok()) {
fprintf(stderr, "Cannot decode primary index entry (%s => %s): %s\n",
it->key().ToString(true).c_str(),
it->value().ToString(true).c_str(), s.ToString().c_str());
assert(false);
}
uint32_t a = record.a_value();
assert(a >= lb_a);
assert(a < ub_a);
uint32_t tid = (a - lb_a) / num_a_per_thread;
if (tid >= static_cast<uint32_t>(threads)) {
tid = threads - 1;
}
existing_a_uniqs[tid].insert(a);
uint32_t c = record.c_value();
assert(c >= lb_c);
assert(c < ub_c);
tid = (c - lb_c) / num_c_per_thread;
if (tid >= static_cast<uint32_t>(threads)) {
tid = threads - 1;
}
auto& existing_c_uniq = existing_c_uniqs[tid];
existing_c_uniq.insert(c);
}
for (uint32_t a = lb_a; a < ub_a; ++a) {
uint32_t tid = (a - lb_a) / num_a_per_thread;
if (tid >= static_cast<uint32_t>(threads)) {
tid = threads - 1;
}
if (0 == existing_a_uniqs[tid].count(a)) {
non_existing_a_uniqs[tid].insert(a);
}
}
for (uint32_t c = lb_c; c < ub_c; ++c) {
uint32_t tid = (c - lb_c) / num_c_per_thread;
if (tid >= static_cast<uint32_t>(threads)) {
tid = threads - 1;
}
if (0 == existing_c_uniqs[tid].count(c)) {
non_existing_c_uniqs[tid].insert(c);
}
}
for (int i = 0; i < threads; ++i) {
uint32_t my_seed = i + shared->GetSeed();
auto& key_gen_for_a = key_gen_for_a_[i];
assert(!key_gen_for_a);
uint32_t low = lb_a + i * num_a_per_thread;
uint32_t high = (i < threads - 1) ? (low + num_a_per_thread) : ub_a;
// The following two assertions assume the test thread count and key
// space remain the same across different runs. Will need to relax.
assert(existing_a_uniqs[i].size() == high - low - 1);
assert(non_existing_a_uniqs[i].size() == 1);
key_gen_for_a = std::make_unique<KeyGenerator>(
my_seed, low, high, std::move(existing_a_uniqs[i]),
std::move(non_existing_a_uniqs[i]));
auto& key_gen_for_c = key_gen_for_c_[i];
assert(!key_gen_for_c);
low = lb_c + i * num_c_per_thread;
high = (i < threads - 1) ? (low + num_c_per_thread) : ub_c;
// The following two assertions assume the test thread count and key
// space remain the same across different runs. Will need to relax.
assert(existing_c_uniqs[i].size() == high - low - 1);
assert(non_existing_c_uniqs[i].size() == 1);
key_gen_for_c = std::make_unique<KeyGenerator>(
my_seed, low, high, std::move(existing_c_uniqs[i]),
std::move(non_existing_c_uniqs[i]));
}
}
}
StressTest* CreateMultiOpsTxnsStressTest() {
return new MultiOpsTxnsStressTest();
}
void CheckAndSetOptionsForMultiOpsTxnStressTest() {
if (FLAGS_test_batches_snapshots || FLAGS_test_cf_consistency) {
fprintf(stderr,
"-test_multi_ops_txns is not compatible with "
"-test_bathces_snapshots and -test_cf_consistency\n");
exit(1);
}
if (!FLAGS_use_txn) {
fprintf(stderr, "-use_txn must be true if -test_multi_ops_txns\n");
exit(1);
} else if (FLAGS_test_secondary > 0) {
fprintf(
stderr,
"secondary instance does not support replaying logs (MANIFEST + WAL) "
"of TransactionDB with write-prepared/write-unprepared policy\n");
exit(1);
}
if (FLAGS_clear_column_family_one_in > 0) {
fprintf(stderr,
"-test_multi_ops_txns is not compatible with clearing column "
"families\n");
exit(1);
}
if (FLAGS_column_families > 1) {
// TODO (yanqin) support separating primary index and secondary index in
// different column families.
fprintf(stderr,
"-test_multi_ops_txns currently does not use more than one column "
"family\n");
exit(1);
}
if (FLAGS_writepercent > 0 || FLAGS_delpercent > 0 ||
FLAGS_delrangepercent > 0) {
fprintf(stderr,
"-test_multi_ops_txns requires that -writepercent, -delpercent and "
"-delrangepercent be 0\n");
exit(1);
}
if (FLAGS_key_spaces_path.empty()) {
fprintf(stderr,
"Must specify a file to store ranges of A and C via "
"-key_spaces_path\n");
exit(1);
}
if (FLAGS_create_timestamped_snapshot_one_in > 0) {
if (FLAGS_txn_write_policy !=
static_cast<uint64_t>(TxnDBWritePolicy::WRITE_COMMITTED)) {
fprintf(stderr,
"Timestamped snapshot is not yet supported by "
"write-prepared/write-unprepared transactions\n");
exit(1);
}
}
if (FLAGS_sync_fault_injection == 1) {
fprintf(stderr,
"Sync fault injection is currently not supported in "
"-test_multi_ops_txns\n");
exit(1);
}
}
} // namespace ROCKSDB_NAMESPACE
#endif // GFLAGS
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