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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).
#ifndef ROCKSDB_LITE
#include "utilities/transactions/transaction_test.h"
#include <algorithm>
#include <atomic>
#include <cinttypes>
#include <functional>
#include <string>
#include <thread>
#include "db/db_impl/db_impl.h"
#include "db/dbformat.h"
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/types.h"
#include "rocksdb/utilities/debug.h"
#include "rocksdb/utilities/transaction.h"
#include "rocksdb/utilities/transaction_db.h"
#include "table/mock_table.h"
#include "test_util/fault_injection_test_env.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/mutexlock.h"
#include "util/random.h"
#include "util/string_util.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_prepared_txn_db.h"
#include "port/port.h"
using std::string;
namespace rocksdb {
using CommitEntry = WritePreparedTxnDB::CommitEntry;
using CommitEntry64b = WritePreparedTxnDB::CommitEntry64b;
using CommitEntry64bFormat = WritePreparedTxnDB::CommitEntry64bFormat;
TEST(PreparedHeap, BasicsTest) {
WritePreparedTxnDB::PreparedHeap heap;
{
MutexLock ml(heap.push_pop_mutex());
heap.push(14l);
// Test with one element
ASSERT_EQ(14l, heap.top());
heap.push(24l);
heap.push(34l);
// Test that old min is still on top
ASSERT_EQ(14l, heap.top());
heap.push(44l);
heap.push(54l);
heap.push(64l);
heap.push(74l);
heap.push(84l);
}
// Test that old min is still on top
ASSERT_EQ(14l, heap.top());
heap.erase(24l);
// Test that old min is still on top
ASSERT_EQ(14l, heap.top());
heap.erase(14l);
// Test that the new comes to the top after multiple erase
ASSERT_EQ(34l, heap.top());
heap.erase(34l);
// Test that the new comes to the top after single erase
ASSERT_EQ(44l, heap.top());
heap.erase(54l);
ASSERT_EQ(44l, heap.top());
heap.pop(); // pop 44l
// Test that the erased items are ignored after pop
ASSERT_EQ(64l, heap.top());
heap.erase(44l);
// Test that erasing an already popped item would work
ASSERT_EQ(64l, heap.top());
heap.erase(84l);
ASSERT_EQ(64l, heap.top());
{
MutexLock ml(heap.push_pop_mutex());
heap.push(85l);
heap.push(86l);
heap.push(87l);
heap.push(88l);
heap.push(89l);
}
heap.erase(87l);
heap.erase(85l);
heap.erase(89l);
heap.erase(86l);
heap.erase(88l);
// Test top remains the same after a random order of many erases
ASSERT_EQ(64l, heap.top());
heap.pop();
// Test that pop works with a series of random pending erases
ASSERT_EQ(74l, heap.top());
ASSERT_FALSE(heap.empty());
heap.pop();
// Test that empty works
ASSERT_TRUE(heap.empty());
}
// This is a scenario reconstructed from a buggy trace. Test that the bug does
// not resurface again.
TEST(PreparedHeap, EmptyAtTheEnd) {
WritePreparedTxnDB::PreparedHeap heap;
{
MutexLock ml(heap.push_pop_mutex());
heap.push(40l);
}
ASSERT_EQ(40l, heap.top());
// Although not a recommended scenario, we must be resilient against erase
// without a prior push.
heap.erase(50l);
ASSERT_EQ(40l, heap.top());
{
MutexLock ml(heap.push_pop_mutex());
heap.push(60l);
}
ASSERT_EQ(40l, heap.top());
heap.erase(60l);
ASSERT_EQ(40l, heap.top());
heap.erase(40l);
ASSERT_TRUE(heap.empty());
{
MutexLock ml(heap.push_pop_mutex());
heap.push(40l);
}
ASSERT_EQ(40l, heap.top());
heap.erase(50l);
ASSERT_EQ(40l, heap.top());
{
MutexLock ml(heap.push_pop_mutex());
heap.push(60l);
}
ASSERT_EQ(40l, heap.top());
heap.erase(40l);
// Test that the erase has not emptied the heap (we had a bug doing that)
ASSERT_FALSE(heap.empty());
ASSERT_EQ(60l, heap.top());
heap.erase(60l);
ASSERT_TRUE(heap.empty());
}
// Generate random order of PreparedHeap access and test that the heap will be
// successfully emptied at the end.
TEST(PreparedHeap, Concurrent) {
const size_t t_cnt = 10;
rocksdb::port::Thread t[t_cnt + 1];
WritePreparedTxnDB::PreparedHeap heap;
port::RWMutex prepared_mutex;
std::atomic<size_t> last;
for (size_t n = 0; n < 100; n++) {
last = 0;
t[0] = rocksdb::port::Thread([&]() {
Random rnd(1103);
for (size_t seq = 1; seq <= t_cnt; seq++) {
// This is not recommended usage but we should be resilient against it.
bool skip_push = rnd.OneIn(5);
if (!skip_push) {
MutexLock ml(heap.push_pop_mutex());
std::this_thread::yield();
heap.push(seq);
last.store(seq);
}
}
});
for (size_t i = 1; i <= t_cnt; i++) {
t[i] = rocksdb::port::Thread([&heap, &prepared_mutex, &last, i]() {
auto seq = i;
do {
std::this_thread::yield();
} while (last.load() < seq);
WriteLock wl(&prepared_mutex);
heap.erase(seq);
});
}
for (size_t i = 0; i <= t_cnt; i++) {
t[i].join();
}
ASSERT_TRUE(heap.empty());
}
}
// Test that WriteBatchWithIndex correctly counts the number of sub-batches
TEST(WriteBatchWithIndex, SubBatchCnt) {
ColumnFamilyOptions cf_options;
std::string cf_name = "two";
DB* db;
Options options;
options.create_if_missing = true;
const std::string dbname = test::PerThreadDBPath("transaction_testdb");
DestroyDB(dbname, options);
ASSERT_OK(DB::Open(options, dbname, &db));
ColumnFamilyHandle* cf_handle = nullptr;
ASSERT_OK(db->CreateColumnFamily(cf_options, cf_name, &cf_handle));
WriteOptions write_options;
size_t batch_cnt = 1;
size_t save_points = 0;
std::vector<size_t> batch_cnt_at;
WriteBatchWithIndex batch(db->DefaultColumnFamily()->GetComparator(), 0, true,
0);
ASSERT_EQ(batch_cnt, batch.SubBatchCnt());
batch_cnt_at.push_back(batch_cnt);
batch.SetSavePoint();
save_points++;
batch.Put(Slice("key"), Slice("value"));
ASSERT_EQ(batch_cnt, batch.SubBatchCnt());
batch_cnt_at.push_back(batch_cnt);
batch.SetSavePoint();
save_points++;
batch.Put(Slice("key2"), Slice("value2"));
ASSERT_EQ(batch_cnt, batch.SubBatchCnt());
// duplicate the keys
batch_cnt_at.push_back(batch_cnt);
batch.SetSavePoint();
save_points++;
batch.Put(Slice("key"), Slice("value3"));
batch_cnt++;
ASSERT_EQ(batch_cnt, batch.SubBatchCnt());
// duplicate the 2nd key. It should not be counted duplicate since a
// sub-patch is cut after the last duplicate.
batch_cnt_at.push_back(batch_cnt);
batch.SetSavePoint();
save_points++;
batch.Put(Slice("key2"), Slice("value4"));
ASSERT_EQ(batch_cnt, batch.SubBatchCnt());
// duplicate the keys but in a different cf. It should not be counted as
// duplicate keys
batch_cnt_at.push_back(batch_cnt);
batch.SetSavePoint();
save_points++;
batch.Put(cf_handle, Slice("key"), Slice("value5"));
ASSERT_EQ(batch_cnt, batch.SubBatchCnt());
// Test that the number of sub-batches matches what we count with
// SubBatchCounter
std::map<uint32_t, const Comparator*> comparators;
comparators[0] = db->DefaultColumnFamily()->GetComparator();
comparators[cf_handle->GetID()] = cf_handle->GetComparator();
SubBatchCounter counter(comparators);
ASSERT_OK(batch.GetWriteBatch()->Iterate(&counter));
ASSERT_EQ(batch_cnt, counter.BatchCount());
// Test that RollbackToSavePoint will properly resets the number of
// sub-batches
for (size_t i = save_points; i > 0; i--) {
batch.RollbackToSavePoint();
ASSERT_EQ(batch_cnt_at[i - 1], batch.SubBatchCnt());
}
// Test the count is right with random batches
{
const size_t TOTAL_KEYS = 20; // 20 ~= 10 to cause a few randoms
Random rnd(1131);
std::string keys[TOTAL_KEYS];
for (size_t k = 0; k < TOTAL_KEYS; k++) {
int len = static_cast<int>(rnd.Uniform(50));
keys[k] = test::RandomKey(&rnd, len);
}
for (size_t i = 0; i < 1000; i++) { // 1000 random batches
WriteBatchWithIndex rndbatch(db->DefaultColumnFamily()->GetComparator(),
0, true, 0);
for (size_t k = 0; k < 10; k++) { // 10 key per batch
size_t ki = static_cast<size_t>(rnd.Uniform(TOTAL_KEYS));
Slice key = Slice(keys[ki]);
std::string buffer;
Slice value = Slice(test::RandomString(&rnd, 16, &buffer));
rndbatch.Put(key, value);
}
SubBatchCounter batch_counter(comparators);
ASSERT_OK(rndbatch.GetWriteBatch()->Iterate(&batch_counter));
ASSERT_EQ(rndbatch.SubBatchCnt(), batch_counter.BatchCount());
}
}
delete cf_handle;
delete db;
}
TEST(CommitEntry64b, BasicTest) {
const size_t INDEX_BITS = static_cast<size_t>(21);
const size_t INDEX_SIZE = static_cast<size_t>(1ull << INDEX_BITS);
const CommitEntry64bFormat FORMAT(static_cast<size_t>(INDEX_BITS));
// zero-initialized CommitEntry64b should indicate an empty entry
CommitEntry64b empty_entry64b;
uint64_t empty_index = 11ul;
CommitEntry empty_entry;
bool ok = empty_entry64b.Parse(empty_index, &empty_entry, FORMAT);
ASSERT_FALSE(ok);
// the zero entry is reserved for un-initialized entries
const size_t MAX_COMMIT = (1 << FORMAT.COMMIT_BITS) - 1 - 1;
// Samples over the numbers that are covered by that many index bits
std::array<uint64_t, 4> is = {{0, 1, INDEX_SIZE / 2 + 1, INDEX_SIZE - 1}};
// Samples over the numbers that are covered by that many commit bits
std::array<uint64_t, 4> ds = {{0, 1, MAX_COMMIT / 2 + 1, MAX_COMMIT}};
// Iterate over prepare numbers that have i) cover all bits of a sequence
// number, and ii) include some bits that fall into the range of index or
// commit bits
for (uint64_t base = 1; base < kMaxSequenceNumber; base *= 2) {
for (uint64_t i : is) {
for (uint64_t d : ds) {
uint64_t p = base + i + d;
for (uint64_t c : {p, p + d / 2, p + d}) {
uint64_t index = p % INDEX_SIZE;
CommitEntry before(p, c), after;
CommitEntry64b entry64b(before, FORMAT);
ok = entry64b.Parse(index, &after, FORMAT);
ASSERT_TRUE(ok);
if (!(before == after)) {
printf("base %" PRIu64 " i %" PRIu64 " d %" PRIu64 " p %" PRIu64
" c %" PRIu64 " index %" PRIu64 "\n",
base, i, d, p, c, index);
}
ASSERT_EQ(before, after);
}
}
}
}
}
class WritePreparedTxnDBMock : public WritePreparedTxnDB {
public:
WritePreparedTxnDBMock(DBImpl* db_impl, TransactionDBOptions& opt)
: WritePreparedTxnDB(db_impl, opt) {}
void SetDBSnapshots(const std::vector<SequenceNumber>& snapshots) {
snapshots_ = snapshots;
}
void TakeSnapshot(SequenceNumber seq) { snapshots_.push_back(seq); }
protected:
const std::vector<SequenceNumber> GetSnapshotListFromDB(
SequenceNumber /* unused */) override {
return snapshots_;
}
private:
std::vector<SequenceNumber> snapshots_;
};
class WritePreparedTransactionTestBase : public TransactionTestBase {
public:
WritePreparedTransactionTestBase(bool use_stackable_db, bool two_write_queue,
TxnDBWritePolicy write_policy,
WriteOrdering write_ordering)
: TransactionTestBase(use_stackable_db, two_write_queue, write_policy,
write_ordering){};
protected:
void UpdateTransactionDBOptions(size_t snapshot_cache_bits,
size_t commit_cache_bits) {
txn_db_options.wp_snapshot_cache_bits = snapshot_cache_bits;
txn_db_options.wp_commit_cache_bits = commit_cache_bits;
}
void UpdateTransactionDBOptions(size_t snapshot_cache_bits) {
txn_db_options.wp_snapshot_cache_bits = snapshot_cache_bits;
}
// If expect_update is set, check if it actually updated old_commit_map_. If
// it did not and yet suggested not to check the next snapshot, do the
// opposite to check if it was not a bad suggestion.
void MaybeUpdateOldCommitMapTestWithNext(uint64_t prepare, uint64_t commit,
uint64_t snapshot,
uint64_t next_snapshot,
bool expect_update) {
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
// reset old_commit_map_empty_ so that its value indicate whether
// old_commit_map_ was updated
wp_db->old_commit_map_empty_ = true;
bool check_next = wp_db->MaybeUpdateOldCommitMap(prepare, commit, snapshot,
snapshot < next_snapshot);
if (expect_update == wp_db->old_commit_map_empty_) {
printf("prepare: %" PRIu64 " commit: %" PRIu64 " snapshot: %" PRIu64
" next: %" PRIu64 "\n",
prepare, commit, snapshot, next_snapshot);
}
EXPECT_EQ(!expect_update, wp_db->old_commit_map_empty_);
if (!check_next && wp_db->old_commit_map_empty_) {
// do the opposite to make sure it was not a bad suggestion
const bool dont_care_bool = true;
wp_db->MaybeUpdateOldCommitMap(prepare, commit, next_snapshot,
dont_care_bool);
if (!wp_db->old_commit_map_empty_) {
printf("prepare: %" PRIu64 " commit: %" PRIu64 " snapshot: %" PRIu64
" next: %" PRIu64 "\n",
prepare, commit, snapshot, next_snapshot);
}
EXPECT_TRUE(wp_db->old_commit_map_empty_);
}
}
// Test that a CheckAgainstSnapshots thread reading old_snapshots will not
// miss a snapshot because of a concurrent update by UpdateSnapshots that is
// writing new_snapshots. Both threads are broken at two points. The sync
// points to enforce them are specified by a1, a2, b1, and b2. CommitEntry
// entry is expected to be vital for one of the snapshots that is common
// between the old and new list of snapshots.
void SnapshotConcurrentAccessTestInternal(
WritePreparedTxnDB* wp_db,
const std::vector<SequenceNumber>& old_snapshots,
const std::vector<SequenceNumber>& new_snapshots, CommitEntry& entry,
SequenceNumber& version, size_t a1, size_t a2, size_t b1, size_t b2) {
// First reset the snapshot list
const std::vector<SequenceNumber> empty_snapshots;
wp_db->old_commit_map_empty_ = true;
wp_db->UpdateSnapshots(empty_snapshots, ++version);
// Then initialize it with the old_snapshots
wp_db->UpdateSnapshots(old_snapshots, ++version);
// Starting from the first thread, cut each thread at two points
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"WritePreparedTxnDB::CheckAgainstSnapshots:p:" + std::to_string(a1),
"WritePreparedTxnDB::UpdateSnapshots:s:start"},
{"WritePreparedTxnDB::UpdateSnapshots:p:" + std::to_string(b1),
"WritePreparedTxnDB::CheckAgainstSnapshots:s:" + std::to_string(a1)},
{"WritePreparedTxnDB::CheckAgainstSnapshots:p:" + std::to_string(a2),
"WritePreparedTxnDB::UpdateSnapshots:s:" + std::to_string(b1)},
{"WritePreparedTxnDB::UpdateSnapshots:p:" + std::to_string(b2),
"WritePreparedTxnDB::CheckAgainstSnapshots:s:" + std::to_string(a2)},
{"WritePreparedTxnDB::CheckAgainstSnapshots:p:end",
"WritePreparedTxnDB::UpdateSnapshots:s:" + std::to_string(b2)},
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
{
ASSERT_TRUE(wp_db->old_commit_map_empty_);
rocksdb::port::Thread t1(
[&]() { wp_db->UpdateSnapshots(new_snapshots, version); });
rocksdb::port::Thread t2([&]() { wp_db->CheckAgainstSnapshots(entry); });
t1.join();
t2.join();
ASSERT_FALSE(wp_db->old_commit_map_empty_);
}
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
wp_db->old_commit_map_empty_ = true;
wp_db->UpdateSnapshots(empty_snapshots, ++version);
wp_db->UpdateSnapshots(old_snapshots, ++version);
// Starting from the second thread, cut each thread at two points
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"WritePreparedTxnDB::UpdateSnapshots:p:" + std::to_string(a1),
"WritePreparedTxnDB::CheckAgainstSnapshots:s:start"},
{"WritePreparedTxnDB::CheckAgainstSnapshots:p:" + std::to_string(b1),
"WritePreparedTxnDB::UpdateSnapshots:s:" + std::to_string(a1)},
{"WritePreparedTxnDB::UpdateSnapshots:p:" + std::to_string(a2),
"WritePreparedTxnDB::CheckAgainstSnapshots:s:" + std::to_string(b1)},
{"WritePreparedTxnDB::CheckAgainstSnapshots:p:" + std::to_string(b2),
"WritePreparedTxnDB::UpdateSnapshots:s:" + std::to_string(a2)},
{"WritePreparedTxnDB::UpdateSnapshots:p:end",
"WritePreparedTxnDB::CheckAgainstSnapshots:s:" + std::to_string(b2)},
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
{
ASSERT_TRUE(wp_db->old_commit_map_empty_);
rocksdb::port::Thread t1(
[&]() { wp_db->UpdateSnapshots(new_snapshots, version); });
rocksdb::port::Thread t2([&]() { wp_db->CheckAgainstSnapshots(entry); });
t1.join();
t2.join();
ASSERT_FALSE(wp_db->old_commit_map_empty_);
}
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
// Verify value of keys.
void VerifyKeys(const std::unordered_map<std::string, std::string>& data,
const Snapshot* snapshot = nullptr) {
std::string value;
ReadOptions read_options;
read_options.snapshot = snapshot;
for (auto& kv : data) {
auto s = db->Get(read_options, kv.first, &value);
ASSERT_TRUE(s.ok() || s.IsNotFound());
if (s.ok()) {
if (kv.second != value) {
printf("key = %s\n", kv.first.c_str());
}
ASSERT_EQ(kv.second, value);
} else {
ASSERT_EQ(kv.second, "NOT_FOUND");
}
// Try with MultiGet API too
std::vector<std::string> values;
auto s_vec = db->MultiGet(read_options, {db->DefaultColumnFamily()},
{kv.first}, &values);
ASSERT_EQ(1, values.size());
ASSERT_EQ(1, s_vec.size());
s = s_vec[0];
ASSERT_TRUE(s.ok() || s.IsNotFound());
if (s.ok()) {
ASSERT_TRUE(kv.second == values[0]);
} else {
ASSERT_EQ(kv.second, "NOT_FOUND");
}
}
}
// Verify all versions of keys.
void VerifyInternalKeys(const std::vector<KeyVersion>& expected_versions) {
std::vector<KeyVersion> versions;
const size_t kMaxKeys = 100000;
ASSERT_OK(GetAllKeyVersions(db, expected_versions.front().user_key,
expected_versions.back().user_key, kMaxKeys,
&versions));
ASSERT_EQ(expected_versions.size(), versions.size());
for (size_t i = 0; i < versions.size(); i++) {
ASSERT_EQ(expected_versions[i].user_key, versions[i].user_key);
ASSERT_EQ(expected_versions[i].sequence, versions[i].sequence);
ASSERT_EQ(expected_versions[i].type, versions[i].type);
if (versions[i].type != kTypeDeletion &&
versions[i].type != kTypeSingleDeletion) {
ASSERT_EQ(expected_versions[i].value, versions[i].value);
}
// Range delete not supported.
assert(expected_versions[i].type != kTypeRangeDeletion);
}
}
};
class WritePreparedTransactionTest
: public WritePreparedTransactionTestBase,
virtual public ::testing::WithParamInterface<
std::tuple<bool, bool, TxnDBWritePolicy, WriteOrdering>> {
public:
WritePreparedTransactionTest()
: WritePreparedTransactionTestBase(
std::get<0>(GetParam()), std::get<1>(GetParam()),
std::get<2>(GetParam()), std::get<3>(GetParam())){};
};
#ifndef ROCKSDB_VALGRIND_RUN
class SnapshotConcurrentAccessTest
: public WritePreparedTransactionTestBase,
virtual public ::testing::WithParamInterface<std::tuple<
bool, bool, TxnDBWritePolicy, WriteOrdering, size_t, size_t>> {
public:
SnapshotConcurrentAccessTest()
: WritePreparedTransactionTestBase(
std::get<0>(GetParam()), std::get<1>(GetParam()),
std::get<2>(GetParam()), std::get<3>(GetParam())),
split_id_(std::get<4>(GetParam())),
split_cnt_(std::get<5>(GetParam())){};
protected:
// A test is split into split_cnt_ tests, each identified with split_id_ where
// 0 <= split_id_ < split_cnt_
size_t split_id_;
size_t split_cnt_;
};
#endif // ROCKSDB_VALGRIND_RUN
class SeqAdvanceConcurrentTest
: public WritePreparedTransactionTestBase,
virtual public ::testing::WithParamInterface<std::tuple<
bool, bool, TxnDBWritePolicy, WriteOrdering, size_t, size_t>> {
public:
SeqAdvanceConcurrentTest()
: WritePreparedTransactionTestBase(
std::get<0>(GetParam()), std::get<1>(GetParam()),
std::get<2>(GetParam()), std::get<3>(GetParam())),
split_id_(std::get<4>(GetParam())),
split_cnt_(std::get<5>(GetParam())){};
protected:
// A test is split into split_cnt_ tests, each identified with split_id_ where
// 0 <= split_id_ < split_cnt_
size_t split_id_;
size_t split_cnt_;
};
INSTANTIATE_TEST_CASE_P(
WritePreparedTransactionTest, WritePreparedTransactionTest,
::testing::Values(
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite)));
#ifndef ROCKSDB_VALGRIND_RUN
INSTANTIATE_TEST_CASE_P(
TwoWriteQueues, SnapshotConcurrentAccessTest,
::testing::Values(
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 0, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 1, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 2, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 3, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 4, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 5, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 6, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 7, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 8, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 9, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 10, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 11, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 12, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 13, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 14, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 15, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 16, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 17, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 18, 20),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 19, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 0, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 1, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 2, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 3, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 4, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 5, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 6, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 7, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 8, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 9, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 10, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 11, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 12, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 13, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 14, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 15, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 16, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 17, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 18, 20),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 19, 20)));
INSTANTIATE_TEST_CASE_P(
OneWriteQueue, SnapshotConcurrentAccessTest,
::testing::Values(
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 0, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 1, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 2, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 3, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 4, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 5, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 6, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 7, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 8, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 9, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 10, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 11, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 12, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 13, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 14, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 15, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 16, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 17, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 18, 20),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 19, 20)));
INSTANTIATE_TEST_CASE_P(
TwoWriteQueues, SeqAdvanceConcurrentTest,
::testing::Values(
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 0, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 1, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 2, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 3, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 4, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 5, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 6, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 7, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 8, 10),
std::make_tuple(false, true, WRITE_PREPARED, kOrderedWrite, 9, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 0, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 1, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 2, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 3, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 4, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 5, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 6, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 7, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 8, 10),
std::make_tuple(false, true, WRITE_PREPARED, kUnorderedWrite, 9, 10)));
INSTANTIATE_TEST_CASE_P(
OneWriteQueue, SeqAdvanceConcurrentTest,
::testing::Values(
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 0, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 1, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 2, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 3, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 4, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 5, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 6, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 7, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 8, 10),
std::make_tuple(false, false, WRITE_PREPARED, kOrderedWrite, 9, 10)));
#endif // ROCKSDB_VALGRIND_RUN
TEST_P(WritePreparedTransactionTest, CommitMapTest) {
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
assert(wp_db);
assert(wp_db->db_impl_);
size_t size = wp_db->COMMIT_CACHE_SIZE;
CommitEntry c = {5, 12}, e;
bool evicted = wp_db->AddCommitEntry(c.prep_seq % size, c, &e);
ASSERT_FALSE(evicted);
// Should be able to read the same value
CommitEntry64b dont_care;
bool found = wp_db->GetCommitEntry(c.prep_seq % size, &dont_care, &e);
ASSERT_TRUE(found);
ASSERT_EQ(c, e);
// Should be able to distinguish between overlapping entries
found = wp_db->GetCommitEntry((c.prep_seq + size) % size, &dont_care, &e);
ASSERT_TRUE(found);
ASSERT_NE(c.prep_seq + size, e.prep_seq);
// Should be able to detect non-existent entry
found = wp_db->GetCommitEntry((c.prep_seq + 1) % size, &dont_care, &e);
ASSERT_FALSE(found);
// Reject an invalid exchange
CommitEntry e2 = {c.prep_seq + size, c.commit_seq + size};
CommitEntry64b e2_64b(e2, wp_db->FORMAT);
bool exchanged = wp_db->ExchangeCommitEntry(e2.prep_seq % size, e2_64b, e);
ASSERT_FALSE(exchanged);
// check whether it did actually reject that
found = wp_db->GetCommitEntry(e2.prep_seq % size, &dont_care, &e);
ASSERT_TRUE(found);
ASSERT_EQ(c, e);
// Accept a valid exchange
CommitEntry64b c_64b(c, wp_db->FORMAT);
CommitEntry e3 = {c.prep_seq + size, c.commit_seq + size + 1};
exchanged = wp_db->ExchangeCommitEntry(c.prep_seq % size, c_64b, e3);
ASSERT_TRUE(exchanged);
// check whether it did actually accepted that
found = wp_db->GetCommitEntry(c.prep_seq % size, &dont_care, &e);
ASSERT_TRUE(found);
ASSERT_EQ(e3, e);
// Rewrite an entry
CommitEntry e4 = {e3.prep_seq + size, e3.commit_seq + size + 1};
evicted = wp_db->AddCommitEntry(e4.prep_seq % size, e4, &e);
ASSERT_TRUE(evicted);
ASSERT_EQ(e3, e);
found = wp_db->GetCommitEntry(e4.prep_seq % size, &dont_care, &e);
ASSERT_TRUE(found);
ASSERT_EQ(e4, e);
}
TEST_P(WritePreparedTransactionTest, MaybeUpdateOldCommitMap) {
// If prepare <= snapshot < commit we should keep the entry around since its
// nonexistence could be interpreted as committed in the snapshot while it is
// not true. We keep such entries around by adding them to the
// old_commit_map_.
uint64_t p /*prepare*/, c /*commit*/, s /*snapshot*/, ns /*next_snapshot*/;
p = 10l, c = 15l, s = 20l, ns = 21l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
// If we do not expect the old commit map to be updated, try also with a next
// snapshot that is expected to update the old commit map. This would test
// that MaybeUpdateOldCommitMap would not prevent us from checking the next
// snapshot that must be checked.
p = 10l, c = 15l, s = 20l, ns = 11l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
p = 10l, c = 20l, s = 20l, ns = 19l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
p = 10l, c = 20l, s = 20l, ns = 21l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
p = 20l, c = 20l, s = 20l, ns = 21l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
p = 20l, c = 20l, s = 20l, ns = 19l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
p = 10l, c = 25l, s = 20l, ns = 21l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, true);
p = 20l, c = 25l, s = 20l, ns = 21l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, true);
p = 21l, c = 25l, s = 20l, ns = 22l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
p = 21l, c = 25l, s = 20l, ns = 19l;
MaybeUpdateOldCommitMapTestWithNext(p, c, s, ns, false);
}
// Trigger the condition where some old memtables are skipped when doing
// TransactionUtil::CheckKey(), and make sure the result is still correct.
TEST_P(WritePreparedTransactionTest, CheckKeySkipOldMemtable) {
const int kAttemptHistoryMemtable = 0;
const int kAttemptImmMemTable = 1;
for (int attempt = kAttemptHistoryMemtable; attempt <= kAttemptImmMemTable;
attempt++) {
options.max_write_buffer_number_to_maintain = 3;
ReOpen();
WriteOptions write_options;
ReadOptions read_options;
TransactionOptions txn_options;
txn_options.set_snapshot = true;
string value;
Status s;
ASSERT_OK(db->Put(write_options, Slice("foo"), Slice("bar")));
ASSERT_OK(db->Put(write_options, Slice("foo2"), Slice("bar")));
Transaction* txn = db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn != nullptr);
ASSERT_OK(txn->SetName("txn"));
Transaction* txn2 = db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn2 != nullptr);
ASSERT_OK(txn2->SetName("txn2"));
// This transaction is created to cause potential conflict.
Transaction* txn_x = db->BeginTransaction(write_options);
ASSERT_OK(txn_x->SetName("txn_x"));
ASSERT_OK(txn_x->Put(Slice("foo"), Slice("bar3")));
ASSERT_OK(txn_x->Prepare());
// Create snapshots after the prepare, but there should still
// be a conflict when trying to read "foo".
if (attempt == kAttemptImmMemTable) {
// For the second attempt, hold flush from beginning. The memtable
// will be switched to immutable after calling TEST_SwitchMemtable()
// while CheckKey() is called.
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"WritePreparedTransactionTest.CheckKeySkipOldMemtable",
"FlushJob::Start"}});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
}
// force a memtable flush. The memtable should still be kept
FlushOptions flush_ops;
if (attempt == kAttemptHistoryMemtable) {
ASSERT_OK(db->Flush(flush_ops));
} else {
assert(attempt == kAttemptImmMemTable);
DBImpl* db_impl = static_cast<DBImpl*>(db->GetRootDB());
db_impl->TEST_SwitchMemtable();
}
uint64_t num_imm_mems;
ASSERT_TRUE(db->GetIntProperty(DB::Properties::kNumImmutableMemTable,
&num_imm_mems));
if (attempt == kAttemptHistoryMemtable) {
ASSERT_EQ(0, num_imm_mems);
} else {
assert(attempt == kAttemptImmMemTable);
ASSERT_EQ(1, num_imm_mems);
}
// Put something in active memtable
ASSERT_OK(db->Put(write_options, Slice("foo3"), Slice("bar")));
// Create txn3 after flushing, but this transaction also needs to
// check all memtables because of they contains uncommitted data.
Transaction* txn3 = db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn3 != nullptr);
ASSERT_OK(txn3->SetName("txn3"));
// Commit the pending write
ASSERT_OK(txn_x->Commit());
// Commit txn, txn2 and tx3. txn and tx3 will conflict but txn2 will
// pass. In all cases, both memtables are queried.
SetPerfLevel(PerfLevel::kEnableCount);
get_perf_context()->Reset();
ASSERT_TRUE(txn3->GetForUpdate(read_options, "foo", &value).IsBusy());
// We should have checked two memtables, active and either immutable
// or history memtable, depending on the test case.
ASSERT_EQ(2, get_perf_context()->get_from_memtable_count);
get_perf_context()->Reset();
ASSERT_TRUE(txn->GetForUpdate(read_options, "foo", &value).IsBusy());
// We should have checked two memtables, active and either immutable
// or history memtable, depending on the test case.
ASSERT_EQ(2, get_perf_context()->get_from_memtable_count);
get_perf_context()->Reset();
ASSERT_OK(txn2->GetForUpdate(read_options, "foo2", &value));
ASSERT_EQ(value, "bar");
// We should have checked two memtables, and since there is no
// conflict, another Get() will be made and fetch the data from
// DB. If it is in immutable memtable, two extra memtable reads
// will be issued. If it is not (in history), only one will
// be made, which is to the active memtable.
if (attempt == kAttemptHistoryMemtable) {
ASSERT_EQ(3, get_perf_context()->get_from_memtable_count);
} else {
assert(attempt == kAttemptImmMemTable);
ASSERT_EQ(4, get_perf_context()->get_from_memtable_count);
}
Transaction* txn4 = db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn4 != nullptr);
ASSERT_OK(txn4->SetName("txn4"));
get_perf_context()->Reset();
ASSERT_OK(txn4->GetForUpdate(read_options, "foo", &value));
if (attempt == kAttemptHistoryMemtable) {
// Active memtable will be checked in snapshot validation and when
// getting the value.
ASSERT_EQ(2, get_perf_context()->get_from_memtable_count);
} else {
// Only active memtable will be checked in snapshot validation but
// both of active and immutable snapshot will be queried when
// getting the value.
assert(attempt == kAttemptImmMemTable);
ASSERT_EQ(3, get_perf_context()->get_from_memtable_count);
}
ASSERT_OK(txn2->Commit());
ASSERT_OK(txn4->Commit());
TEST_SYNC_POINT("WritePreparedTransactionTest.CheckKeySkipOldMemtable");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
SetPerfLevel(PerfLevel::kDisable);
delete txn;
delete txn2;
delete txn3;
delete txn4;
delete txn_x;
}
}
// Reproduce the bug with two snapshots with the same seuqence number and test
// that the release of the first snapshot will not affect the reads by the other
// snapshot
TEST_P(WritePreparedTransactionTest, DoubleSnapshot) {
TransactionOptions txn_options;
Status s;
// Insert initial value
ASSERT_OK(db->Put(WriteOptions(), "key", "value1"));
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
Transaction* txn =
wp_db->BeginTransaction(WriteOptions(), txn_options, nullptr);
ASSERT_OK(txn->SetName("txn"));
ASSERT_OK(txn->Put("key", "value2"));
ASSERT_OK(txn->Prepare());
// Three snapshots with the same seq number
const Snapshot* snapshot0 = wp_db->GetSnapshot();
const Snapshot* snapshot1 = wp_db->GetSnapshot();
const Snapshot* snapshot2 = wp_db->GetSnapshot();
ASSERT_OK(txn->Commit());
SequenceNumber cache_size = wp_db->COMMIT_CACHE_SIZE;
SequenceNumber overlap_seq = txn->GetId() + cache_size;
delete txn;
// 4th snapshot with a larger seq
const Snapshot* snapshot3 = wp_db->GetSnapshot();
// Cause an eviction to advance max evicted seq number
// This also fetches the 4 snapshots from db since their seq is lower than the
// new max
wp_db->AddCommitted(overlap_seq, overlap_seq);
ReadOptions ropt;
// It should see the value before commit
ropt.snapshot = snapshot2;
PinnableSlice pinnable_val;
s = wp_db->Get(ropt, wp_db->DefaultColumnFamily(), "key", &pinnable_val);
ASSERT_OK(s);
ASSERT_TRUE(pinnable_val == "value1");
pinnable_val.Reset();
wp_db->ReleaseSnapshot(snapshot1);
// It should still see the value before commit
s = wp_db->Get(ropt, wp_db->DefaultColumnFamily(), "key", &pinnable_val);
ASSERT_OK(s);
ASSERT_TRUE(pinnable_val == "value1");
pinnable_val.Reset();
// Cause an eviction to advance max evicted seq number and trigger updating
// the snapshot list
overlap_seq += cache_size;
wp_db->AddCommitted(overlap_seq, overlap_seq);
// It should still see the value before commit
s = wp_db->Get(ropt, wp_db->DefaultColumnFamily(), "key", &pinnable_val);
ASSERT_OK(s);
ASSERT_TRUE(pinnable_val == "value1");
pinnable_val.Reset();
wp_db->ReleaseSnapshot(snapshot0);
wp_db->ReleaseSnapshot(snapshot2);
wp_db->ReleaseSnapshot(snapshot3);
}
size_t UniqueCnt(std::vector<SequenceNumber> vec) {
std::set<SequenceNumber> aset;
for (auto i : vec) {
aset.insert(i);
}
return aset.size();
}
// Test that the entries in old_commit_map_ get garbage collected properly
TEST_P(WritePreparedTransactionTest, OldCommitMapGC) {
const size_t snapshot_cache_bits = 0;
const size_t commit_cache_bits = 0;
DBImpl* mock_db = new DBImpl(options, dbname);
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
std::unique_ptr<WritePreparedTxnDBMock> wp_db(
new WritePreparedTxnDBMock(mock_db, txn_db_options));
SequenceNumber seq = 0;
// Take the first snapshot that overlaps with two txn
auto prep_seq = ++seq;
wp_db->AddPrepared(prep_seq);
auto prep_seq2 = ++seq;
wp_db->AddPrepared(prep_seq2);
auto snap_seq1 = seq;
wp_db->TakeSnapshot(snap_seq1);
auto commit_seq = ++seq;
wp_db->AddCommitted(prep_seq, commit_seq);
wp_db->RemovePrepared(prep_seq);
auto commit_seq2 = ++seq;
wp_db->AddCommitted(prep_seq2, commit_seq2);
wp_db->RemovePrepared(prep_seq2);
// Take the 2nd and 3rd snapshot that overlap with the same txn
prep_seq = ++seq;
wp_db->AddPrepared(prep_seq);
auto snap_seq2 = seq;
wp_db->TakeSnapshot(snap_seq2);
seq++;
auto snap_seq3 = seq;
wp_db->TakeSnapshot(snap_seq3);
seq++;
commit_seq = ++seq;
wp_db->AddCommitted(prep_seq, commit_seq);
wp_db->RemovePrepared(prep_seq);
// Make sure max_evicted_seq_ will be larger than 2nd snapshot by evicting the
// only item in the commit_cache_ via another commit.
prep_seq = ++seq;
wp_db->AddPrepared(prep_seq);
commit_seq = ++seq;
wp_db->AddCommitted(prep_seq, commit_seq);
wp_db->RemovePrepared(prep_seq);
// Verify that the evicted commit entries for all snapshots are in the
// old_commit_map_
{
ASSERT_FALSE(wp_db->old_commit_map_empty_.load());
ReadLock rl(&wp_db->old_commit_map_mutex_);
ASSERT_EQ(3, wp_db->old_commit_map_.size());
ASSERT_EQ(2, UniqueCnt(wp_db->old_commit_map_[snap_seq1]));
ASSERT_EQ(1, UniqueCnt(wp_db->old_commit_map_[snap_seq2]));
ASSERT_EQ(1, UniqueCnt(wp_db->old_commit_map_[snap_seq3]));
}
// Verify that the 2nd snapshot is cleaned up after the release
wp_db->ReleaseSnapshotInternal(snap_seq2);
{
ASSERT_FALSE(wp_db->old_commit_map_empty_.load());
ReadLock rl(&wp_db->old_commit_map_mutex_);
ASSERT_EQ(2, wp_db->old_commit_map_.size());
ASSERT_EQ(2, UniqueCnt(wp_db->old_commit_map_[snap_seq1]));
ASSERT_EQ(1, UniqueCnt(wp_db->old_commit_map_[snap_seq3]));
}
// Verify that the 1st snapshot is cleaned up after the release
wp_db->ReleaseSnapshotInternal(snap_seq1);
{
ASSERT_FALSE(wp_db->old_commit_map_empty_.load());
ReadLock rl(&wp_db->old_commit_map_mutex_);
ASSERT_EQ(1, wp_db->old_commit_map_.size());
ASSERT_EQ(1, UniqueCnt(wp_db->old_commit_map_[snap_seq3]));
}
// Verify that the 3rd snapshot is cleaned up after the release
wp_db->ReleaseSnapshotInternal(snap_seq3);
{
ASSERT_TRUE(wp_db->old_commit_map_empty_.load());
ReadLock rl(&wp_db->old_commit_map_mutex_);
ASSERT_EQ(0, wp_db->old_commit_map_.size());
}
}
TEST_P(WritePreparedTransactionTest, CheckAgainstSnapshotsTest) {
std::vector<SequenceNumber> snapshots = {100l, 200l, 300l, 400l, 500l,
600l, 700l, 800l, 900l};
const size_t snapshot_cache_bits = 2;
const uint64_t cache_size = 1ul << snapshot_cache_bits;
// Safety check to express the intended size in the test. Can be adjusted if
// the snapshots lists changed.
assert((1ul << snapshot_cache_bits) * 2 + 1 == snapshots.size());
DBImpl* mock_db = new DBImpl(options, dbname);
UpdateTransactionDBOptions(snapshot_cache_bits);
std::unique_ptr<WritePreparedTxnDBMock> wp_db(
new WritePreparedTxnDBMock(mock_db, txn_db_options));
SequenceNumber version = 1000l;
ASSERT_EQ(0, wp_db->snapshots_total_);
wp_db->UpdateSnapshots(snapshots, version);
ASSERT_EQ(snapshots.size(), wp_db->snapshots_total_);
// seq numbers are chosen so that we have two of them between each two
// snapshots. If the diff of two consecutive seq is more than 5, there is a
// snapshot between them.
std::vector<SequenceNumber> seqs = {50l, 55l, 150l, 155l, 250l, 255l, 350l,
355l, 450l, 455l, 550l, 555l, 650l, 655l,
750l, 755l, 850l, 855l, 950l, 955l};
assert(seqs.size() > 1);
for (size_t i = 0; i < seqs.size() - 1; i++) {
wp_db->old_commit_map_empty_ = true; // reset
CommitEntry commit_entry = {seqs[i], seqs[i + 1]};
wp_db->CheckAgainstSnapshots(commit_entry);
// Expect update if there is snapshot in between the prepare and commit
bool expect_update = commit_entry.commit_seq - commit_entry.prep_seq > 5 &&
commit_entry.commit_seq >= snapshots.front() &&
commit_entry.prep_seq <= snapshots.back();
ASSERT_EQ(expect_update, !wp_db->old_commit_map_empty_);
}
// Test that search will include multiple snapshot from snapshot cache
{
// exclude first and last item in the cache
CommitEntry commit_entry = {snapshots.front() + 1,
snapshots[cache_size - 1] - 1};
wp_db->old_commit_map_empty_ = true; // reset
wp_db->old_commit_map_.clear();
wp_db->CheckAgainstSnapshots(commit_entry);
ASSERT_EQ(wp_db->old_commit_map_.size(), cache_size - 2);
}
// Test that search will include multiple snapshot from old snapshots
{
// include two in the middle
CommitEntry commit_entry = {snapshots[cache_size] + 1,
snapshots[cache_size + 2] + 1};
wp_db->old_commit_map_empty_ = true; // reset
wp_db->old_commit_map_.clear();
wp_db->CheckAgainstSnapshots(commit_entry);
ASSERT_EQ(wp_db->old_commit_map_.size(), 2);
}
// Test that search will include both snapshot cache and old snapshots
// Case 1: includes all in snapshot cache
{
CommitEntry commit_entry = {snapshots.front() - 1, snapshots.back() + 1};
wp_db->old_commit_map_empty_ = true; // reset
wp_db->old_commit_map_.clear();
wp_db->CheckAgainstSnapshots(commit_entry);
ASSERT_EQ(wp_db->old_commit_map_.size(), snapshots.size());
}
// Case 2: includes all snapshot caches except the smallest
{
CommitEntry commit_entry = {snapshots.front() + 1, snapshots.back() + 1};
wp_db->old_commit_map_empty_ = true; // reset
wp_db->old_commit_map_.clear();
wp_db->CheckAgainstSnapshots(commit_entry);
ASSERT_EQ(wp_db->old_commit_map_.size(), snapshots.size() - 1);
}
// Case 3: includes only the largest of snapshot cache
{
CommitEntry commit_entry = {snapshots[cache_size - 1] - 1,
snapshots.back() + 1};
wp_db->old_commit_map_empty_ = true; // reset
wp_db->old_commit_map_.clear();
wp_db->CheckAgainstSnapshots(commit_entry);
ASSERT_EQ(wp_db->old_commit_map_.size(), snapshots.size() - cache_size + 1);
}
}
// This test is too slow for travis
#ifndef TRAVIS
#ifndef ROCKSDB_VALGRIND_RUN
// Test that CheckAgainstSnapshots will not miss a live snapshot if it is run in
// parallel with UpdateSnapshots.
TEST_P(SnapshotConcurrentAccessTest, SnapshotConcurrentAccessTest) {
// We have a sync point in the method under test after checking each snapshot.
// If you increase the max number of snapshots in this test, more sync points
// in the methods must also be added.
const std::vector<SequenceNumber> snapshots = {10l, 20l, 30l, 40l, 50l,
60l, 70l, 80l, 90l, 100l};
const size_t snapshot_cache_bits = 2;
// Safety check to express the intended size in the test. Can be adjusted if
// the snapshots lists changed.
assert((1ul << snapshot_cache_bits) * 2 + 2 == snapshots.size());
SequenceNumber version = 1000l;
// Choose the cache size so that the new snapshot list could replace all the
// existing items in the cache and also have some overflow.
DBImpl* mock_db = new DBImpl(options, dbname);
UpdateTransactionDBOptions(snapshot_cache_bits);
std::unique_ptr<WritePreparedTxnDBMock> wp_db(
new WritePreparedTxnDBMock(mock_db, txn_db_options));
const size_t extra = 2;
size_t loop_id = 0;
// Add up to extra items that do not fit into the cache
for (size_t old_size = 1; old_size <= wp_db->SNAPSHOT_CACHE_SIZE + extra;
old_size++) {
const std::vector<SequenceNumber> old_snapshots(
snapshots.begin(), snapshots.begin() + old_size);
// Each member of old snapshot might or might not appear in the new list. We
// create a common_snapshots for each combination.
size_t new_comb_cnt = size_t(1) << old_size;
for (size_t new_comb = 0; new_comb < new_comb_cnt; new_comb++, loop_id++) {
if (loop_id % split_cnt_ != split_id_) continue;
printf("."); // To signal progress
fflush(stdout);
std::vector<SequenceNumber> common_snapshots;
for (size_t i = 0; i < old_snapshots.size(); i++) {
if (IsInCombination(i, new_comb)) {
common_snapshots.push_back(old_snapshots[i]);
}
}
// And add some new snapshots to the common list
for (size_t added_snapshots = 0;
added_snapshots <= snapshots.size() - old_snapshots.size();
added_snapshots++) {
std::vector<SequenceNumber> new_snapshots = common_snapshots;
for (size_t i = 0; i < added_snapshots; i++) {
new_snapshots.push_back(snapshots[old_snapshots.size() + i]);
}
for (auto it = common_snapshots.begin(); it != common_snapshots.end();
++it) {
auto snapshot = *it;
// Create a commit entry that is around the snapshot and thus should
// be not be discarded
CommitEntry entry = {static_cast<uint64_t>(snapshot - 1),
snapshot + 1};
// The critical part is when iterating the snapshot cache. Afterwards,
// we are operating under the lock
size_t a_range =
std::min(old_snapshots.size(), wp_db->SNAPSHOT_CACHE_SIZE) + 1;
size_t b_range =
std::min(new_snapshots.size(), wp_db->SNAPSHOT_CACHE_SIZE) + 1;
// Break each thread at two points
for (size_t a1 = 1; a1 <= a_range; a1++) {
for (size_t a2 = a1 + 1; a2 <= a_range; a2++) {
for (size_t b1 = 1; b1 <= b_range; b1++) {
for (size_t b2 = b1 + 1; b2 <= b_range; b2++) {
SnapshotConcurrentAccessTestInternal(
wp_db.get(), old_snapshots, new_snapshots, entry, version,
a1, a2, b1, b2);
}
}
}
}
}
}
}
}
printf("\n");
}
#endif // ROCKSDB_VALGRIND_RUN
#endif // TRAVIS
// This test clarifies the contract of AdvanceMaxEvictedSeq method
TEST_P(WritePreparedTransactionTest, AdvanceMaxEvictedSeqBasicTest) {
DBImpl* mock_db = new DBImpl(options, dbname);
std::unique_ptr<WritePreparedTxnDBMock> wp_db(
new WritePreparedTxnDBMock(mock_db, txn_db_options));
// 1. Set the initial values for max, prepared, and snapshots
SequenceNumber zero_max = 0l;
// Set the initial list of prepared txns
const std::vector<SequenceNumber> initial_prepared = {10, 30, 50, 100,
150, 200, 250};
for (auto p : initial_prepared) {
wp_db->AddPrepared(p);
}
// This updates the max value and also set old prepared
SequenceNumber init_max = 100;
wp_db->AdvanceMaxEvictedSeq(zero_max, init_max);
const std::vector<SequenceNumber> initial_snapshots = {20, 40};
wp_db->SetDBSnapshots(initial_snapshots);
// This will update the internal cache of snapshots from the DB
wp_db->UpdateSnapshots(initial_snapshots, init_max);
// 2. Invoke AdvanceMaxEvictedSeq
const std::vector<SequenceNumber> latest_snapshots = {20, 110, 220, 300};
wp_db->SetDBSnapshots(latest_snapshots);
SequenceNumber new_max = 200;
wp_db->AdvanceMaxEvictedSeq(init_max, new_max);
// 3. Verify that the state matches with AdvanceMaxEvictedSeq contract
// a. max should be updated to new_max
ASSERT_EQ(wp_db->max_evicted_seq_, new_max);
// b. delayed prepared should contain every txn <= max and prepared should
// only contain txns > max
auto it = initial_prepared.begin();
for (; it != initial_prepared.end() && *it <= new_max; ++it) {
ASSERT_EQ(1, wp_db->delayed_prepared_.erase(*it));
}
ASSERT_TRUE(wp_db->delayed_prepared_.empty());
for (; it != initial_prepared.end() && !wp_db->prepared_txns_.empty();
++it, wp_db->prepared_txns_.pop()) {
ASSERT_EQ(*it, wp_db->prepared_txns_.top());
}
ASSERT_TRUE(it == initial_prepared.end());
ASSERT_TRUE(wp_db->prepared_txns_.empty());
// c. snapshots should contain everything below new_max
auto sit = latest_snapshots.begin();
for (size_t i = 0; sit != latest_snapshots.end() && *sit <= new_max &&
i < wp_db->snapshots_total_;
sit++, i++) {
ASSERT_TRUE(i < wp_db->snapshots_total_);
// This test is in small scale and the list of snapshots are assumed to be
// within the cache size limit. This is just a safety check to double check
// that assumption.
ASSERT_TRUE(i < wp_db->SNAPSHOT_CACHE_SIZE);
ASSERT_EQ(*sit, wp_db->snapshot_cache_[i]);
}
}
// A new snapshot should always be always larger than max_evicted_seq_
// Otherwise the snapshot does not go through AdvanceMaxEvictedSeq
TEST_P(WritePreparedTransactionTest, NewSnapshotLargerThanMax) {
WriteOptions woptions;
TransactionOptions txn_options;
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
Transaction* txn0 = db->BeginTransaction(woptions, txn_options);
ASSERT_OK(txn0->Put(Slice("key"), Slice("value")));
ASSERT_OK(txn0->Commit());
const SequenceNumber seq = txn0->GetId(); // is also prepare seq
delete txn0;
std::vector<Transaction*> txns;
// Inc seq without committing anything
for (int i = 0; i < 10; i++) {
Transaction* txn = db->BeginTransaction(woptions, txn_options);
ASSERT_OK(txn->SetName("xid" + std::to_string(i)));
ASSERT_OK(txn->Put(Slice("key" + std::to_string(i)), Slice("value")));
ASSERT_OK(txn->Prepare());
txns.push_back(txn);
}
// The new commit is seq + 10
ASSERT_OK(db->Put(woptions, "key", "value"));
auto snap = wp_db->GetSnapshot();
const SequenceNumber last_seq = snap->GetSequenceNumber();
wp_db->ReleaseSnapshot(snap);
ASSERT_LT(seq, last_seq);
// Otherwise our test is not effective
ASSERT_LT(last_seq - seq, wp_db->INC_STEP_FOR_MAX_EVICTED);
// Evict seq out of commit cache
const SequenceNumber overwrite_seq = seq + wp_db->COMMIT_CACHE_SIZE;
// Check that the next write could make max go beyond last
auto last_max = wp_db->max_evicted_seq_.load();
wp_db->AddCommitted(overwrite_seq, overwrite_seq);
// Check that eviction has advanced the max
ASSERT_LT(last_max, wp_db->max_evicted_seq_.load());
// Check that the new max has not advanced the last seq
ASSERT_LT(wp_db->max_evicted_seq_.load(), last_seq);
for (auto txn : txns) {
txn->Rollback();
delete txn;
}
}
// A new snapshot should always be always larger than max_evicted_seq_
// In very rare cases max could be below last published seq. Test that
// taking snapshot will wait for max to catch up.
TEST_P(WritePreparedTransactionTest, MaxCatchupWithNewSnapshot) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 0; // only 1 entry => frequent eviction
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
WriteOptions woptions;
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
const int writes = 50;
const int batch_cnt = 4;
rocksdb::port::Thread t1([&]() {
for (int i = 0; i < writes; i++) {
WriteBatch batch;
// For duplicate keys cause 4 commit entries, each evicting an entry that
// is not published yet, thus causing max ecited seq go higher than last
// published.
for (int b = 0; b < batch_cnt; b++) {
batch.Put("foo", "foo");
}
db->Write(woptions, &batch);
}
});
rocksdb::port::Thread t2([&]() {
while (wp_db->max_evicted_seq_ == 0) { // wait for insert thread
std::this_thread::yield();
}
for (int i = 0; i < 10; i++) {
auto snap = db->GetSnapshot();
if (snap->GetSequenceNumber() != 0) {
ASSERT_LT(wp_db->max_evicted_seq_, snap->GetSequenceNumber());
} // seq 0 is ok to be less than max since nothing is visible to it
db->ReleaseSnapshot(snap);
}
});
t1.join();
t2.join();
// Make sure that the test has worked and seq number has advanced as we
// thought
auto snap = db->GetSnapshot();
ASSERT_GT(snap->GetSequenceNumber(), batch_cnt * writes - 1);
db->ReleaseSnapshot(snap);
}
// Check that old_commit_map_ cleanup works correctly if the snapshot equals
// max_evicted_seq_.
TEST_P(WritePreparedTransactionTest, CleanupSnapshotEqualToMax) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 0; // only 1 entry => frequent eviction
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
WriteOptions woptions;
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
// Insert something to increase seq
ASSERT_OK(db->Put(woptions, "key", "value"));
auto snap = db->GetSnapshot();
auto snap_seq = snap->GetSequenceNumber();
// Another insert should trigger eviction + load snapshot from db
ASSERT_OK(db->Put(woptions, "key", "value"));
// This is the scenario that we check agaisnt
ASSERT_EQ(snap_seq, wp_db->max_evicted_seq_);
// old_commit_map_ now has some data that needs gc
ASSERT_EQ(1, wp_db->snapshots_total_);
ASSERT_EQ(1, wp_db->old_commit_map_.size());
db->ReleaseSnapshot(snap);
// Another insert should trigger eviction + load snapshot from db
ASSERT_OK(db->Put(woptions, "key", "value"));
// the snapshot and related metadata must be properly garbage collected
ASSERT_EQ(0, wp_db->snapshots_total_);
ASSERT_TRUE(wp_db->snapshots_all_.empty());
ASSERT_EQ(0, wp_db->old_commit_map_.size());
}
TEST_P(WritePreparedTransactionTest, AdvanceSeqByOne) {
auto snap = db->GetSnapshot();
auto seq1 = snap->GetSequenceNumber();
db->ReleaseSnapshot(snap);
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
wp_db->AdvanceSeqByOne();
snap = db->GetSnapshot();
auto seq2 = snap->GetSequenceNumber();
db->ReleaseSnapshot(snap);
ASSERT_LT(seq1, seq2);
}
// Test that the txn Initilize calls the overridden functions
TEST_P(WritePreparedTransactionTest, TxnInitialize) {
TransactionOptions txn_options;
WriteOptions write_options;
ASSERT_OK(db->Put(write_options, "key", "value"));
Transaction* txn0 = db->BeginTransaction(write_options, txn_options);
ASSERT_OK(txn0->SetName("xid"));
ASSERT_OK(txn0->Put(Slice("key"), Slice("value1")));
ASSERT_OK(txn0->Prepare());
// SetSnapshot is overridden to update min_uncommitted_
txn_options.set_snapshot = true;
Transaction* txn1 = db->BeginTransaction(write_options, txn_options);
auto snap = txn1->GetSnapshot();
auto snap_impl = reinterpret_cast<const SnapshotImpl*>(snap);
// If ::Initialize calls the overriden SetSnapshot, min_uncommitted_ must be
// udpated
ASSERT_GT(snap_impl->min_uncommitted_, kMinUnCommittedSeq);
txn0->Rollback();
txn1->Rollback();
delete txn0;
delete txn1;
}
// This tests that transactions with duplicate keys perform correctly after max
// is advancing their prepared sequence numbers. This will not be the case if
// for example the txn does not add the prepared seq for the second sub-batch to
// the PreparedHeap structure.
TEST_P(WritePreparedTransactionTest, AdvanceMaxEvictedSeqWithDuplicatesTest) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 1; // disable commit cache
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
ReadOptions ropt;
PinnableSlice pinnable_val;
WriteOptions write_options;
TransactionOptions txn_options;
Transaction* txn0 = db->BeginTransaction(write_options, txn_options);
ASSERT_OK(txn0->SetName("xid"));
ASSERT_OK(txn0->Put(Slice("key"), Slice("value1")));
ASSERT_OK(txn0->Put(Slice("key"), Slice("value2")));
ASSERT_OK(txn0->Prepare());
ASSERT_OK(db->Put(write_options, "key2", "value"));
// Will cause max advance due to disabled commit cache
ASSERT_OK(db->Put(write_options, "key3", "value"));
auto s = db->Get(ropt, db->DefaultColumnFamily(), "key", &pinnable_val);
ASSERT_TRUE(s.IsNotFound());
delete txn0;
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
wp_db->db_impl_->FlushWAL(true);
wp_db->TEST_Crash();
ReOpenNoDelete();
assert(db != nullptr);
s = db->Get(ropt, db->DefaultColumnFamily(), "key", &pinnable_val);
ASSERT_TRUE(s.IsNotFound());
txn0 = db->GetTransactionByName("xid");
ASSERT_OK(txn0->Rollback());
delete txn0;
}
TEST_P(SeqAdvanceConcurrentTest, SeqAdvanceConcurrentTest) {
// Given the sequential run of txns, with this timeout we should never see a
// deadlock nor a timeout unless we have a key conflict, which should be
// almost infeasible.
txn_db_options.transaction_lock_timeout = 1000;
txn_db_options.default_lock_timeout = 1000;
ReOpen();
FlushOptions fopt;
// Number of different txn types we use in this test
const size_t type_cnt = 5;
// The size of the first write group
// TODO(myabandeh): This should be increase for pre-release tests
const size_t first_group_size = 2;
// Total number of txns we run in each test
// TODO(myabandeh): This should be increase for pre-release tests
const size_t txn_cnt = first_group_size + 1;
size_t base[txn_cnt + 1] = {
1,
};
for (size_t bi = 1; bi <= txn_cnt; bi++) {
base[bi] = base[bi - 1] * type_cnt;
}
const size_t max_n = static_cast<size_t>(std::pow(type_cnt, txn_cnt));
printf("Number of cases being tested is %" ROCKSDB_PRIszt "\n", max_n);
for (size_t n = 0; n < max_n; n++, ReOpen()) {
if (n % split_cnt_ != split_id_) continue;
if (n % 1000 == 0) {
printf("Tested %" ROCKSDB_PRIszt " cases so far\n", n);
}
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
auto seq = db_impl->TEST_GetLastVisibleSequence();
with_empty_commits = 0;
exp_seq = seq;
// This is increased before writing the batch for commit
commit_writes = 0;
// This is increased before txn starts linking if it expects to do a commit
// eventually
expected_commits = 0;
std::vector<port::Thread> threads;
linked = 0;
std::atomic<bool> batch_formed(false);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"WriteThread::EnterAsBatchGroupLeader:End",
[&](void* /*arg*/) { batch_formed = true; });
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"WriteThread::JoinBatchGroup:Wait", [&](void* /*arg*/) {
linked++;
if (linked == 1) {
// Wait until the others are linked too.
while (linked < first_group_size) {
}
} else if (linked == 1 + first_group_size) {
// Make the 2nd batch of the rest of writes plus any followup
// commits from the first batch
while (linked < txn_cnt + commit_writes) {
}
}
// Then we will have one or more batches consisting of follow-up
// commits from the 2nd batch. There is a bit of non-determinism here
// but it should be tolerable.
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
for (size_t bi = 0; bi < txn_cnt; bi++) {
// get the bi-th digit in number system based on type_cnt
size_t d = (n % base[bi + 1]) / base[bi];
switch (d) {
case 0:
threads.emplace_back(txn_t0, bi);
break;
case 1:
threads.emplace_back(txn_t1, bi);
break;
case 2:
threads.emplace_back(txn_t2, bi);
break;
case 3:
threads.emplace_back(txn_t3, bi);
break;
case 4:
threads.emplace_back(txn_t3, bi);
break;
default:
assert(false);
}
// wait to be linked
while (linked.load() <= bi) {
}
// after a queue of size first_group_size
if (bi + 1 == first_group_size) {
while (!batch_formed) {
}
// to make it more deterministic, wait until the commits are linked
while (linked.load() <= bi + expected_commits) {
}
}
}
for (auto& t : threads) {
t.join();
}
if (options.two_write_queues) {
// In this case none of the above scheduling tricks to deterministically
// form merged batches works because the writes go to separate queues.
// This would result in different write groups in each run of the test. We
// still keep the test since although non-deterministic and hard to debug,
// it is still useful to have.
// TODO(myabandeh): Add a deterministic unit test for two_write_queues
}
// Check if memtable inserts advanced seq number as expected
seq = db_impl->TEST_GetLastVisibleSequence();
ASSERT_EQ(exp_seq, seq);
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
// Check if recovery preserves the last sequence number
db_impl->FlushWAL(true);
ReOpenNoDelete();
assert(db != nullptr);
db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
seq = db_impl->TEST_GetLastVisibleSequence();
ASSERT_LE(exp_seq, seq + with_empty_commits);
// Check if flush preserves the last sequence number
db_impl->Flush(fopt);
seq = db_impl->GetLatestSequenceNumber();
ASSERT_LE(exp_seq, seq + with_empty_commits);
// Check if recovery after flush preserves the last sequence number
db_impl->FlushWAL(true);
ReOpenNoDelete();
assert(db != nullptr);
db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
seq = db_impl->GetLatestSequenceNumber();
ASSERT_LE(exp_seq, seq + with_empty_commits);
}
}
// Run a couple of different txns among them some uncommitted. Restart the db at
// a couple points to check whether the list of uncommitted txns are recovered
// properly.
TEST_P(WritePreparedTransactionTest, BasicRecoveryTest) {
options.disable_auto_compactions = true;
ReOpen();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
txn_t0(0);
TransactionOptions txn_options;
WriteOptions write_options;
size_t index = 1000;
Transaction* txn0 = db->BeginTransaction(write_options, txn_options);
auto istr0 = std::to_string(index);
auto s = txn0->SetName("xid" + istr0);
ASSERT_OK(s);
s = txn0->Put(Slice("foo0" + istr0), Slice("bar0" + istr0));
ASSERT_OK(s);
s = txn0->Prepare();
auto prep_seq_0 = txn0->GetId();
txn_t1(0);
index++;
Transaction* txn1 = db->BeginTransaction(write_options, txn_options);
auto istr1 = std::to_string(index);
s = txn1->SetName("xid" + istr1);
ASSERT_OK(s);
s = txn1->Put(Slice("foo1" + istr1), Slice("bar"));
ASSERT_OK(s);
s = txn1->Prepare();
auto prep_seq_1 = txn1->GetId();
txn_t2(0);
ReadOptions ropt;
PinnableSlice pinnable_val;
// Check the value is not committed before restart
s = db->Get(ropt, db->DefaultColumnFamily(), "foo0" + istr0, &pinnable_val);
ASSERT_TRUE(s.IsNotFound());
pinnable_val.Reset();
delete txn0;
delete txn1;
wp_db->db_impl_->FlushWAL(true);
wp_db->TEST_Crash();
ReOpenNoDelete();
assert(db != nullptr);
wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
// After recovery, all the uncommitted txns (0 and 1) should be inserted into
// delayed_prepared_
ASSERT_TRUE(wp_db->prepared_txns_.empty());
ASSERT_FALSE(wp_db->delayed_prepared_empty_);
ASSERT_LE(prep_seq_0, wp_db->max_evicted_seq_);
ASSERT_LE(prep_seq_1, wp_db->max_evicted_seq_);
{
ReadLock rl(&wp_db->prepared_mutex_);
ASSERT_EQ(2, wp_db->delayed_prepared_.size());
ASSERT_TRUE(wp_db->delayed_prepared_.find(prep_seq_0) !=
wp_db->delayed_prepared_.end());
ASSERT_TRUE(wp_db->delayed_prepared_.find(prep_seq_1) !=
wp_db->delayed_prepared_.end());
}
// Check the value is still not committed after restart
s = db->Get(ropt, db->DefaultColumnFamily(), "foo0" + istr0, &pinnable_val);
ASSERT_TRUE(s.IsNotFound());
pinnable_val.Reset();
txn_t3(0);
// Test that a recovered txns will be properly marked committed for the next
// recovery
txn1 = db->GetTransactionByName("xid" + istr1);
ASSERT_NE(txn1, nullptr);
txn1->Commit();
delete txn1;
index++;
Transaction* txn2 = db->BeginTransaction(write_options, txn_options);
auto istr2 = std::to_string(index);
s = txn2->SetName("xid" + istr2);
ASSERT_OK(s);
s = txn2->Put(Slice("foo2" + istr2), Slice("bar"));
ASSERT_OK(s);
s = txn2->Prepare();
auto prep_seq_2 = txn2->GetId();
delete txn2;
wp_db->db_impl_->FlushWAL(true);
wp_db->TEST_Crash();
ReOpenNoDelete();
assert(db != nullptr);
wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
ASSERT_TRUE(wp_db->prepared_txns_.empty());
ASSERT_FALSE(wp_db->delayed_prepared_empty_);
// 0 and 2 are prepared and 1 is committed
{
ReadLock rl(&wp_db->prepared_mutex_);
ASSERT_EQ(2, wp_db->delayed_prepared_.size());
const auto& end = wp_db->delayed_prepared_.end();
ASSERT_NE(wp_db->delayed_prepared_.find(prep_seq_0), end);
ASSERT_EQ(wp_db->delayed_prepared_.find(prep_seq_1), end);
ASSERT_NE(wp_db->delayed_prepared_.find(prep_seq_2), end);
}
ASSERT_LE(prep_seq_0, wp_db->max_evicted_seq_);
ASSERT_LE(prep_seq_2, wp_db->max_evicted_seq_);
// Commit all the remaining txns
txn0 = db->GetTransactionByName("xid" + istr0);
ASSERT_NE(txn0, nullptr);
txn0->Commit();
txn2 = db->GetTransactionByName("xid" + istr2);
ASSERT_NE(txn2, nullptr);
txn2->Commit();
// Check the value is committed after commit
s = db->Get(ropt, db->DefaultColumnFamily(), "foo0" + istr0, &pinnable_val);
ASSERT_TRUE(s.ok());
ASSERT_TRUE(pinnable_val == ("bar0" + istr0));
pinnable_val.Reset();
delete txn0;
delete txn2;
wp_db->db_impl_->FlushWAL(true);
ReOpenNoDelete();
assert(db != nullptr);
wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
ASSERT_TRUE(wp_db->prepared_txns_.empty());
ASSERT_TRUE(wp_db->delayed_prepared_empty_);
// Check the value is still committed after recovery
s = db->Get(ropt, db->DefaultColumnFamily(), "foo0" + istr0, &pinnable_val);
ASSERT_TRUE(s.ok());
ASSERT_TRUE(pinnable_val == ("bar0" + istr0));
pinnable_val.Reset();
}
// After recovery the commit map is empty while the max is set. The code would
// go through a different path which requires a separate test. Test that the
// committed data before the restart is visible to all snapshots.
TEST_P(WritePreparedTransactionTest, IsInSnapshotEmptyMapTest) {
for (bool end_with_prepare : {false, true}) {
ReOpen();
WriteOptions woptions;
ASSERT_OK(db->Put(woptions, "key", "value"));
ASSERT_OK(db->Put(woptions, "key", "value"));
ASSERT_OK(db->Put(woptions, "key", "value"));
SequenceNumber prepare_seq = kMaxSequenceNumber;
if (end_with_prepare) {
TransactionOptions txn_options;
Transaction* txn = db->BeginTransaction(woptions, txn_options);
ASSERT_OK(txn->SetName("xid0"));
ASSERT_OK(txn->Prepare());
prepare_seq = txn->GetId();
delete txn;
}
dynamic_cast<WritePreparedTxnDB*>(db)->TEST_Crash();
auto db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
db_impl->FlushWAL(true);
ReOpenNoDelete();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
assert(wp_db != nullptr);
ASSERT_GT(wp_db->max_evicted_seq_, 0); // max after recovery
// Take a snapshot right after recovery
const Snapshot* snap = db->GetSnapshot();
auto snap_seq = snap->GetSequenceNumber();
ASSERT_GT(snap_seq, 0);
for (SequenceNumber seq = 0;
seq <= wp_db->max_evicted_seq_ && seq != prepare_seq; seq++) {
ASSERT_TRUE(wp_db->IsInSnapshot(seq, snap_seq));
}
if (end_with_prepare) {
ASSERT_FALSE(wp_db->IsInSnapshot(prepare_seq, snap_seq));
}
// trivial check
ASSERT_FALSE(wp_db->IsInSnapshot(snap_seq + 1, snap_seq));
db->ReleaseSnapshot(snap);
ASSERT_OK(db->Put(woptions, "key", "value"));
// Take a snapshot after some writes
snap = db->GetSnapshot();
snap_seq = snap->GetSequenceNumber();
for (SequenceNumber seq = 0;
seq <= wp_db->max_evicted_seq_ && seq != prepare_seq; seq++) {
ASSERT_TRUE(wp_db->IsInSnapshot(seq, snap_seq));
}
if (end_with_prepare) {
ASSERT_FALSE(wp_db->IsInSnapshot(prepare_seq, snap_seq));
}
// trivial check
ASSERT_FALSE(wp_db->IsInSnapshot(snap_seq + 1, snap_seq));
db->ReleaseSnapshot(snap);
}
}
// Shows the contract of IsInSnapshot when called on invalid/released snapshots
TEST_P(WritePreparedTransactionTest, IsInSnapshotReleased) {
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
WriteOptions woptions;
ASSERT_OK(db->Put(woptions, "key", "value"));
// snap seq = 1
const Snapshot* snap1 = db->GetSnapshot();
ASSERT_OK(db->Put(woptions, "key", "value"));
ASSERT_OK(db->Put(woptions, "key", "value"));
// snap seq = 3
const Snapshot* snap2 = db->GetSnapshot();
const SequenceNumber seq = 1;
// Evict seq out of commit cache
size_t overwrite_seq = wp_db->COMMIT_CACHE_SIZE + seq;
wp_db->AddCommitted(overwrite_seq, overwrite_seq);
SequenceNumber snap_seq;
uint64_t min_uncommitted = kMinUnCommittedSeq;
bool released;
released = false;
snap_seq = snap1->GetSequenceNumber();
ASSERT_LE(seq, snap_seq);
// Valid snapshot lower than max
ASSERT_LE(snap_seq, wp_db->max_evicted_seq_);
ASSERT_TRUE(wp_db->IsInSnapshot(seq, snap_seq, min_uncommitted, &released));
ASSERT_FALSE(released);
released = false;
snap_seq = snap1->GetSequenceNumber();
// Invaid snapshot lower than max
ASSERT_LE(snap_seq + 1, wp_db->max_evicted_seq_);
ASSERT_TRUE(
wp_db->IsInSnapshot(seq, snap_seq + 1, min_uncommitted, &released));
ASSERT_TRUE(released);
db->ReleaseSnapshot(snap1);
released = false;
// Released snapshot lower than max
ASSERT_TRUE(wp_db->IsInSnapshot(seq, snap_seq, min_uncommitted, &released));
// The release does not take affect until the next max advance
ASSERT_FALSE(released);
released = false;
// Invaid snapshot lower than max
ASSERT_TRUE(
wp_db->IsInSnapshot(seq, snap_seq + 1, min_uncommitted, &released));
ASSERT_TRUE(released);
// This make the snapshot release to reflect in txn db structures
wp_db->AdvanceMaxEvictedSeq(wp_db->max_evicted_seq_,
wp_db->max_evicted_seq_ + 1);
released = false;
// Released snapshot lower than max
ASSERT_TRUE(wp_db->IsInSnapshot(seq, snap_seq, min_uncommitted, &released));
ASSERT_TRUE(released);
released = false;
// Invaid snapshot lower than max
ASSERT_TRUE(
wp_db->IsInSnapshot(seq, snap_seq + 1, min_uncommitted, &released));
ASSERT_TRUE(released);
snap_seq = snap2->GetSequenceNumber();
released = false;
// Unreleased snapshot lower than max
ASSERT_TRUE(wp_db->IsInSnapshot(seq, snap_seq, min_uncommitted, &released));
ASSERT_FALSE(released);
db->ReleaseSnapshot(snap2);
}
// Test WritePreparedTxnDB's IsInSnapshot against different ordering of
// snapshot, max_committed_seq_, prepared, and commit entries.
TEST_P(WritePreparedTransactionTest, IsInSnapshotTest) {
WriteOptions wo;
// Use small commit cache to trigger lots of eviction and fast advance of
// max_evicted_seq_
const size_t commit_cache_bits = 3;
// Same for snapshot cache size
const size_t snapshot_cache_bits = 2;
// Take some preliminary snapshots first. This is to stress the data structure
// that holds the old snapshots as it will be designed to be efficient when
// only a few snapshots are below the max_evicted_seq_.
for (int max_snapshots = 1; max_snapshots < 20; max_snapshots++) {
// Leave some gap between the preliminary snapshots and the final snapshot
// that we check. This should test for also different overlapping scenarios
// between the last snapshot and the commits.
for (int max_gap = 1; max_gap < 10; max_gap++) {
// Since we do not actually write to db, we mock the seq as it would be
// increased by the db. The only exception is that we need db seq to
// advance for our snapshots. for which we apply a dummy put each time we
// increase our mock of seq.
uint64_t seq = 0;
// At each step we prepare a txn and then we commit it in the next txn.
// This emulates the consecutive transactions that write to the same key
uint64_t cur_txn = 0;
// Number of snapshots taken so far
int num_snapshots = 0;
// Number of gaps applied so far
int gap_cnt = 0;
// The final snapshot that we will inspect
uint64_t snapshot = 0;
bool found_committed = false;
// To stress the data structure that maintain prepared txns, at each cycle
// we add a new prepare txn. These do not mean to be committed for
// snapshot inspection.
std::set<uint64_t> prepared;
// We keep the list of txns committed before we take the last snapshot.
// These should be the only seq numbers that will be found in the snapshot
std::set<uint64_t> committed_before;
// The set of commit seq numbers to be excluded from IsInSnapshot queries
std::set<uint64_t> commit_seqs;
DBImpl* mock_db = new DBImpl(options, dbname);
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
std::unique_ptr<WritePreparedTxnDBMock> wp_db(
new WritePreparedTxnDBMock(mock_db, txn_db_options));
// We continue until max advances a bit beyond the snapshot.
while (!snapshot || wp_db->max_evicted_seq_ < snapshot + 100) {
// do prepare for a transaction
seq++;
wp_db->AddPrepared(seq);
prepared.insert(seq);
// If cur_txn is not started, do prepare for it.
if (!cur_txn) {
seq++;
cur_txn = seq;
wp_db->AddPrepared(cur_txn);
} else { // else commit it
seq++;
wp_db->AddCommitted(cur_txn, seq);
wp_db->RemovePrepared(cur_txn);
commit_seqs.insert(seq);
if (!snapshot) {
committed_before.insert(cur_txn);
}
cur_txn = 0;
}
if (num_snapshots < max_snapshots - 1) {
// Take preliminary snapshots
wp_db->TakeSnapshot(seq);
num_snapshots++;
} else if (gap_cnt < max_gap) {
// Wait for some gap before taking the final snapshot
gap_cnt++;
} else if (!snapshot) {
// Take the final snapshot if it is not already taken
snapshot = seq;
wp_db->TakeSnapshot(snapshot);
num_snapshots++;
}
// If the snapshot is taken, verify seq numbers visible to it. We redo
// it at each cycle to test that the system is still sound when
// max_evicted_seq_ advances.
if (snapshot) {
for (uint64_t s = 1;
s <= seq && commit_seqs.find(s) == commit_seqs.end(); s++) {
bool was_committed =
(committed_before.find(s) != committed_before.end());
bool is_in_snapshot = wp_db->IsInSnapshot(s, snapshot);
if (was_committed != is_in_snapshot) {
printf("max_snapshots %d max_gap %d seq %" PRIu64 " max %" PRIu64
" snapshot %" PRIu64
" gap_cnt %d num_snapshots %d s %" PRIu64 "\n",
max_snapshots, max_gap, seq,
wp_db->max_evicted_seq_.load(), snapshot, gap_cnt,
num_snapshots, s);
}
ASSERT_EQ(was_committed, is_in_snapshot);
found_committed = found_committed || is_in_snapshot;
}
}
}
// Safety check to make sure the test actually ran
ASSERT_TRUE(found_committed);
// As an extra check, check if prepared set will be properly empty after
// they are committed.
if (cur_txn) {
wp_db->AddCommitted(cur_txn, seq);
wp_db->RemovePrepared(cur_txn);
}
for (auto p : prepared) {
wp_db->AddCommitted(p, seq);
wp_db->RemovePrepared(p);
}
ASSERT_TRUE(wp_db->delayed_prepared_.empty());
ASSERT_TRUE(wp_db->prepared_txns_.empty());
}
}
}
void ASSERT_SAME(ReadOptions roptions, TransactionDB* db, Status exp_s,
PinnableSlice& exp_v, Slice key) {
Status s;
PinnableSlice v;
s = db->Get(roptions, db->DefaultColumnFamily(), key, &v);
ASSERT_TRUE(exp_s == s);
ASSERT_TRUE(s.ok() || s.IsNotFound());
if (s.ok()) {
ASSERT_TRUE(exp_v == v);
}
// Try with MultiGet API too
std::vector<std::string> values;
auto s_vec =
db->MultiGet(roptions, {db->DefaultColumnFamily()}, {key}, &values);
ASSERT_EQ(1, values.size());
ASSERT_EQ(1, s_vec.size());
s = s_vec[0];
ASSERT_TRUE(exp_s == s);
ASSERT_TRUE(s.ok() || s.IsNotFound());
if (s.ok()) {
ASSERT_TRUE(exp_v == values[0]);
}
}
void ASSERT_SAME(TransactionDB* db, Status exp_s, PinnableSlice& exp_v,
Slice key) {
ASSERT_SAME(ReadOptions(), db, exp_s, exp_v, key);
}
TEST_P(WritePreparedTransactionTest, RollbackTest) {
ReadOptions roptions;
WriteOptions woptions;
TransactionOptions txn_options;
const size_t num_keys = 4;
const size_t num_values = 5;
for (size_t ikey = 1; ikey <= num_keys; ikey++) {
for (size_t ivalue = 0; ivalue < num_values; ivalue++) {
for (bool crash : {false, true}) {
ReOpen();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
std::string key_str = "key" + ToString(ikey);
switch (ivalue) {
case 0:
break;
case 1:
ASSERT_OK(db->Put(woptions, key_str, "initvalue1"));
break;
case 2:
ASSERT_OK(db->Merge(woptions, key_str, "initvalue2"));
break;
case 3:
ASSERT_OK(db->Delete(woptions, key_str));
break;
case 4:
ASSERT_OK(db->SingleDelete(woptions, key_str));
break;
default:
assert(0);
}
PinnableSlice v1;
auto s1 =
db->Get(roptions, db->DefaultColumnFamily(), Slice("key1"), &v1);
PinnableSlice v2;
auto s2 =
db->Get(roptions, db->DefaultColumnFamily(), Slice("key2"), &v2);
PinnableSlice v3;
auto s3 =
db->Get(roptions, db->DefaultColumnFamily(), Slice("key3"), &v3);
PinnableSlice v4;
auto s4 =
db->Get(roptions, db->DefaultColumnFamily(), Slice("key4"), &v4);
Transaction* txn = db->BeginTransaction(woptions, txn_options);
auto s = txn->SetName("xid0");
ASSERT_OK(s);
s = txn->Put(Slice("key1"), Slice("value1"));
ASSERT_OK(s);
s = txn->Merge(Slice("key2"), Slice("value2"));
ASSERT_OK(s);
s = txn->Delete(Slice("key3"));
ASSERT_OK(s);
s = txn->SingleDelete(Slice("key4"));
ASSERT_OK(s);
s = txn->Prepare();
ASSERT_OK(s);
{
ReadLock rl(&wp_db->prepared_mutex_);
ASSERT_FALSE(wp_db->prepared_txns_.empty());
ASSERT_EQ(txn->GetId(), wp_db->prepared_txns_.top());
}
ASSERT_SAME(db, s1, v1, "key1");
ASSERT_SAME(db, s2, v2, "key2");
ASSERT_SAME(db, s3, v3, "key3");
ASSERT_SAME(db, s4, v4, "key4");
if (crash) {
delete txn;
auto db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
db_impl->FlushWAL(true);
dynamic_cast<WritePreparedTxnDB*>(db)->TEST_Crash();
ReOpenNoDelete();
assert(db != nullptr);
wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
txn = db->GetTransactionByName("xid0");
ASSERT_FALSE(wp_db->delayed_prepared_empty_);
ReadLock rl(&wp_db->prepared_mutex_);
ASSERT_TRUE(wp_db->prepared_txns_.empty());
ASSERT_FALSE(wp_db->delayed_prepared_.empty());
ASSERT_TRUE(wp_db->delayed_prepared_.find(txn->GetId()) !=
wp_db->delayed_prepared_.end());
}
ASSERT_SAME(db, s1, v1, "key1");
ASSERT_SAME(db, s2, v2, "key2");
ASSERT_SAME(db, s3, v3, "key3");
ASSERT_SAME(db, s4, v4, "key4");
s = txn->Rollback();
ASSERT_OK(s);
{
ASSERT_TRUE(wp_db->delayed_prepared_empty_);
ReadLock rl(&wp_db->prepared_mutex_);
ASSERT_TRUE(wp_db->prepared_txns_.empty());
ASSERT_TRUE(wp_db->delayed_prepared_.empty());
}
ASSERT_SAME(db, s1, v1, "key1");
ASSERT_SAME(db, s2, v2, "key2");
ASSERT_SAME(db, s3, v3, "key3");
ASSERT_SAME(db, s4, v4, "key4");
delete txn;
}
}
}
}
TEST_P(WritePreparedTransactionTest, DisableGCDuringRecoveryTest) {
// Use large buffer to avoid memtable flush after 1024 insertions
options.write_buffer_size = 1024 * 1024;
ReOpen();
std::vector<KeyVersion> versions;
uint64_t seq = 0;
for (uint64_t i = 1; i <= 1024; i++) {
std::string v = "bar" + ToString(i);
ASSERT_OK(db->Put(WriteOptions(), "foo", v));
VerifyKeys({{"foo", v}});
seq++; // one for the key/value
KeyVersion kv = {"foo", v, seq, kTypeValue};
if (options.two_write_queues) {
seq++; // one for the commit
}
versions.emplace_back(kv);
}
std::reverse(std::begin(versions), std::end(versions));
VerifyInternalKeys(versions);
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
db_impl->FlushWAL(true);
// Use small buffer to ensure memtable flush during recovery
options.write_buffer_size = 1024;
ReOpenNoDelete();
VerifyInternalKeys(versions);
}
TEST_P(WritePreparedTransactionTest, SequenceNumberZeroTest) {
ASSERT_OK(db->Put(WriteOptions(), "foo", "bar"));
VerifyKeys({{"foo", "bar"}});
const Snapshot* snapshot = db->GetSnapshot();
ASSERT_OK(db->Flush(FlushOptions()));
// Dummy keys to avoid compaction trivially move files and get around actual
// compaction logic.
ASSERT_OK(db->Put(WriteOptions(), "a", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "z", "dummy"));
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
// Compaction will output keys with sequence number 0, if it is visible to
// earliest snapshot. Make sure IsInSnapshot() report sequence number 0 is
// visible to any snapshot.
VerifyKeys({{"foo", "bar"}});
VerifyKeys({{"foo", "bar"}}, snapshot);
VerifyInternalKeys({{"foo", "bar", 0, kTypeValue}});
db->ReleaseSnapshot(snapshot);
}
// Compaction should not remove a key if it is not committed, and should
// proceed with older versions of the key as-if the new version doesn't exist.
TEST_P(WritePreparedTransactionTest, CompactionShouldKeepUncommittedKeys) {
options.disable_auto_compactions = true;
ReOpen();
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
// Snapshots to avoid keys get evicted.
std::vector<const Snapshot*> snapshots;
// Keep track of expected sequence number.
SequenceNumber expected_seq = 0;
auto add_key = [&](std::function<Status()> func) {
ASSERT_OK(func());
expected_seq++;
if (options.two_write_queues) {
expected_seq++; // 1 for commit
}
ASSERT_EQ(expected_seq, db_impl->TEST_GetLastVisibleSequence());
snapshots.push_back(db->GetSnapshot());
};
// Each key here represent a standalone test case.
add_key([&]() { return db->Put(WriteOptions(), "key1", "value1_1"); });
add_key([&]() { return db->Put(WriteOptions(), "key2", "value2_1"); });
add_key([&]() { return db->Put(WriteOptions(), "key3", "value3_1"); });
add_key([&]() { return db->Put(WriteOptions(), "key4", "value4_1"); });
add_key([&]() { return db->Merge(WriteOptions(), "key5", "value5_1"); });
add_key([&]() { return db->Merge(WriteOptions(), "key5", "value5_2"); });
add_key([&]() { return db->Put(WriteOptions(), "key6", "value6_1"); });
add_key([&]() { return db->Put(WriteOptions(), "key7", "value7_1"); });
ASSERT_OK(db->Flush(FlushOptions()));
add_key([&]() { return db->Delete(WriteOptions(), "key6"); });
add_key([&]() { return db->SingleDelete(WriteOptions(), "key7"); });
auto* transaction = db->BeginTransaction(WriteOptions());
ASSERT_OK(transaction->SetName("txn"));
ASSERT_OK(transaction->Put("key1", "value1_2"));
ASSERT_OK(transaction->Delete("key2"));
ASSERT_OK(transaction->SingleDelete("key3"));
ASSERT_OK(transaction->Merge("key4", "value4_2"));
ASSERT_OK(transaction->Merge("key5", "value5_3"));
ASSERT_OK(transaction->Put("key6", "value6_2"));
ASSERT_OK(transaction->Put("key7", "value7_2"));
// Prepare but not commit.
ASSERT_OK(transaction->Prepare());
ASSERT_EQ(++expected_seq, db->GetLatestSequenceNumber());
ASSERT_OK(db->Flush(FlushOptions()));
for (auto* s : snapshots) {
db->ReleaseSnapshot(s);
}
// Dummy keys to avoid compaction trivially move files and get around actual
// compaction logic.
ASSERT_OK(db->Put(WriteOptions(), "a", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "z", "dummy"));
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
VerifyKeys({
{"key1", "value1_1"},
{"key2", "value2_1"},
{"key3", "value3_1"},
{"key4", "value4_1"},
{"key5", "value5_1,value5_2"},
{"key6", "NOT_FOUND"},
{"key7", "NOT_FOUND"},
});
VerifyInternalKeys({
{"key1", "value1_2", expected_seq, kTypeValue},
{"key1", "value1_1", 0, kTypeValue},
{"key2", "", expected_seq, kTypeDeletion},
{"key2", "value2_1", 0, kTypeValue},
{"key3", "", expected_seq, kTypeSingleDeletion},
{"key3", "value3_1", 0, kTypeValue},
{"key4", "value4_2", expected_seq, kTypeMerge},
{"key4", "value4_1", 0, kTypeValue},
{"key5", "value5_3", expected_seq, kTypeMerge},
{"key5", "value5_1,value5_2", 0, kTypeValue},
{"key6", "value6_2", expected_seq, kTypeValue},
{"key7", "value7_2", expected_seq, kTypeValue},
});
ASSERT_OK(transaction->Commit());
VerifyKeys({
{"key1", "value1_2"},
{"key2", "NOT_FOUND"},
{"key3", "NOT_FOUND"},
{"key4", "value4_1,value4_2"},
{"key5", "value5_1,value5_2,value5_3"},
{"key6", "value6_2"},
{"key7", "value7_2"},
});
delete transaction;
}
// Compaction should keep keys visible to a snapshot based on commit sequence,
// not just prepare sequence.
TEST_P(WritePreparedTransactionTest, CompactionShouldKeepSnapshotVisibleKeys) {
options.disable_auto_compactions = true;
ReOpen();
// Keep track of expected sequence number.
SequenceNumber expected_seq = 0;
auto* txn1 = db->BeginTransaction(WriteOptions());
ASSERT_OK(txn1->SetName("txn1"));
ASSERT_OK(txn1->Put("key1", "value1_1"));
ASSERT_OK(txn1->Prepare());
ASSERT_EQ(++expected_seq, db->GetLatestSequenceNumber());
ASSERT_OK(txn1->Commit());
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
ASSERT_EQ(++expected_seq, db_impl->TEST_GetLastVisibleSequence());
delete txn1;
// Take a snapshots to avoid keys get evicted before compaction.
const Snapshot* snapshot1 = db->GetSnapshot();
auto* txn2 = db->BeginTransaction(WriteOptions());
ASSERT_OK(txn2->SetName("txn2"));
ASSERT_OK(txn2->Put("key2", "value2_1"));
ASSERT_OK(txn2->Prepare());
ASSERT_EQ(++expected_seq, db->GetLatestSequenceNumber());
// txn1 commit before snapshot2 and it is visible to snapshot2.
// txn2 commit after snapshot2 and it is not visible.
const Snapshot* snapshot2 = db->GetSnapshot();
ASSERT_OK(txn2->Commit());
ASSERT_EQ(++expected_seq, db_impl->TEST_GetLastVisibleSequence());
delete txn2;
// Take a snapshots to avoid keys get evicted before compaction.
const Snapshot* snapshot3 = db->GetSnapshot();
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1_2"));
expected_seq++; // 1 for write
SequenceNumber seq1 = expected_seq;
if (options.two_write_queues) {
expected_seq++; // 1 for commit
}
ASSERT_EQ(expected_seq, db_impl->TEST_GetLastVisibleSequence());
ASSERT_OK(db->Put(WriteOptions(), "key2", "value2_2"));
expected_seq++; // 1 for write
SequenceNumber seq2 = expected_seq;
if (options.two_write_queues) {
expected_seq++; // 1 for commit
}
ASSERT_EQ(expected_seq, db_impl->TEST_GetLastVisibleSequence());
ASSERT_OK(db->Flush(FlushOptions()));
db->ReleaseSnapshot(snapshot1);
db->ReleaseSnapshot(snapshot3);
// Dummy keys to avoid compaction trivially move files and get around actual
// compaction logic.
ASSERT_OK(db->Put(WriteOptions(), "a", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "z", "dummy"));
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
VerifyKeys({{"key1", "value1_2"}, {"key2", "value2_2"}});
VerifyKeys({{"key1", "value1_1"}, {"key2", "NOT_FOUND"}}, snapshot2);
VerifyInternalKeys({
{"key1", "value1_2", seq1, kTypeValue},
// "value1_1" is visible to snapshot2. Also keys at bottom level visible
// to earliest snapshot will output with seq = 0.
{"key1", "value1_1", 0, kTypeValue},
{"key2", "value2_2", seq2, kTypeValue},
});
db->ReleaseSnapshot(snapshot2);
}
TEST_P(WritePreparedTransactionTest, SmallestUncommittedOptimization) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 0; // disable commit cache
for (bool has_recent_prepare : {true, false}) {
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1"));
auto* transaction =
db->BeginTransaction(WriteOptions(), TransactionOptions(), nullptr);
ASSERT_OK(transaction->SetName("txn"));
ASSERT_OK(transaction->Delete("key1"));
ASSERT_OK(transaction->Prepare());
// snapshot1 should get min_uncommitted from prepared_txns_ heap.
auto snapshot1 = db->GetSnapshot();
ASSERT_EQ(transaction->GetId(),
((SnapshotImpl*)snapshot1)->min_uncommitted_);
// Add a commit to advance max_evicted_seq and move the prepared transaction
// into delayed_prepared_ set.
ASSERT_OK(db->Put(WriteOptions(), "key2", "value2"));
Transaction* txn2 = nullptr;
if (has_recent_prepare) {
txn2 =
db->BeginTransaction(WriteOptions(), TransactionOptions(), nullptr);
ASSERT_OK(txn2->SetName("txn2"));
ASSERT_OK(txn2->Put("key3", "value3"));
ASSERT_OK(txn2->Prepare());
}
// snapshot2 should get min_uncommitted from delayed_prepared_ set.
auto snapshot2 = db->GetSnapshot();
ASSERT_EQ(transaction->GetId(),
((SnapshotImpl*)snapshot1)->min_uncommitted_);
ASSERT_OK(transaction->Commit());
delete transaction;
if (has_recent_prepare) {
ASSERT_OK(txn2->Commit());
delete txn2;
}
VerifyKeys({{"key1", "NOT_FOUND"}});
VerifyKeys({{"key1", "value1"}}, snapshot1);
VerifyKeys({{"key1", "value1"}}, snapshot2);
db->ReleaseSnapshot(snapshot1);
db->ReleaseSnapshot(snapshot2);
}
}
// Insert two values, v1 and v2, for a key. Between prepare and commit of v2
// take two snapshots, s1 and s2. Release s1 during compaction.
// Test to make sure compaction doesn't get confused and think s1 can see both
// values, and thus compact out the older value by mistake.
TEST_P(WritePreparedTransactionTest, ReleaseSnapshotDuringCompaction) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 0; // minimum commit cache
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1_1"));
auto* transaction =
db->BeginTransaction(WriteOptions(), TransactionOptions(), nullptr);
ASSERT_OK(transaction->SetName("txn"));
ASSERT_OK(transaction->Put("key1", "value1_2"));
ASSERT_OK(transaction->Prepare());
auto snapshot1 = db->GetSnapshot();
// Increment sequence number.
ASSERT_OK(db->Put(WriteOptions(), "key2", "value2"));
auto snapshot2 = db->GetSnapshot();
ASSERT_OK(transaction->Commit());
delete transaction;
VerifyKeys({{"key1", "value1_2"}});
VerifyKeys({{"key1", "value1_1"}}, snapshot1);
VerifyKeys({{"key1", "value1_1"}}, snapshot2);
// Add a flush to avoid compaction to fallback to trivial move.
auto callback = [&](void*) {
// Release snapshot1 after CompactionIterator init.
// CompactionIterator need to figure out the earliest snapshot
// that can see key1:value1_2 is kMaxSequenceNumber, not
// snapshot1 or snapshot2.
db->ReleaseSnapshot(snapshot1);
// Add some keys to advance max_evicted_seq.
ASSERT_OK(db->Put(WriteOptions(), "key3", "value3"));
ASSERT_OK(db->Put(WriteOptions(), "key4", "value4"));
};
SyncPoint::GetInstance()->SetCallBack("CompactionIterator:AfterInit",
callback);
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(db->Flush(FlushOptions()));
VerifyKeys({{"key1", "value1_2"}});
VerifyKeys({{"key1", "value1_1"}}, snapshot2);
db->ReleaseSnapshot(snapshot2);
SyncPoint::GetInstance()->ClearAllCallBacks();
}
// Insert two values, v1 and v2, for a key. Take two snapshots, s1 and s2,
// after committing v2. Release s1 during compaction, right after compaction
// processes v2 and before processes v1. Test to make sure compaction doesn't
// get confused and believe v1 and v2 are visible to different snapshot
// (v1 by s2, v2 by s1) and refuse to compact out v1.
TEST_P(WritePreparedTransactionTest, ReleaseSnapshotDuringCompaction2) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 0; // minimum commit cache
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1"));
ASSERT_OK(db->Put(WriteOptions(), "key1", "value2"));
SequenceNumber v2_seq = db->GetLatestSequenceNumber();
auto* s1 = db->GetSnapshot();
// Advance sequence number.
ASSERT_OK(db->Put(WriteOptions(), "key2", "dummy"));
auto* s2 = db->GetSnapshot();
int count_value = 0;
auto callback = [&](void* arg) {
auto* ikey = reinterpret_cast<ParsedInternalKey*>(arg);
if (ikey->user_key == "key1") {
count_value++;
if (count_value == 2) {
// Processing v1.
db->ReleaseSnapshot(s1);
// Add some keys to advance max_evicted_seq and update
// old_commit_map.
ASSERT_OK(db->Put(WriteOptions(), "key3", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "key4", "dummy"));
}
}
};
SyncPoint::GetInstance()->SetCallBack("CompactionIterator:ProcessKV",
callback);
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(db->Flush(FlushOptions()));
// value1 should be compact out.
VerifyInternalKeys({{"key1", "value2", v2_seq, kTypeValue}});
// cleanup
db->ReleaseSnapshot(s2);
SyncPoint::GetInstance()->ClearAllCallBacks();
}
// Insert two values, v1 and v2, for a key. Insert another dummy key
// so to evict the commit cache for v2, while v1 is still in commit cache.
// Take two snapshots, s1 and s2. Release s1 during compaction.
// Since commit cache for v2 is evicted, and old_commit_map don't have
// s1 (it is released),
// TODO(myabandeh): how can we be sure that the v2's commit info is evicted
// (and not v1's)? Instead of putting a dummy, we can directly call
// AddCommitted(v2_seq + cache_size, ...) to evict v2's entry from commit cache.
TEST_P(WritePreparedTransactionTest, ReleaseSnapshotDuringCompaction3) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 1; // commit cache size = 2
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
// Add a dummy key to evict v2 commit cache, but keep v1 commit cache.
// It also advance max_evicted_seq and can trigger old_commit_map cleanup.
auto add_dummy = [&]() {
auto* txn_dummy =
db->BeginTransaction(WriteOptions(), TransactionOptions(), nullptr);
ASSERT_OK(txn_dummy->SetName("txn_dummy"));
ASSERT_OK(txn_dummy->Put("dummy", "dummy"));
ASSERT_OK(txn_dummy->Prepare());
ASSERT_OK(txn_dummy->Commit());
delete txn_dummy;
};
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1"));
auto* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions(), nullptr);
ASSERT_OK(txn->SetName("txn"));
ASSERT_OK(txn->Put("key1", "value2"));
ASSERT_OK(txn->Prepare());
// TODO(myabandeh): replace it with GetId()?
auto v2_seq = db->GetLatestSequenceNumber();
ASSERT_OK(txn->Commit());
delete txn;
auto* s1 = db->GetSnapshot();
// Dummy key to advance sequence number.
add_dummy();
auto* s2 = db->GetSnapshot();
auto callback = [&](void*) {
db->ReleaseSnapshot(s1);
// Add some dummy entries to trigger s1 being cleanup from old_commit_map.
add_dummy();
add_dummy();
};
SyncPoint::GetInstance()->SetCallBack("CompactionIterator:AfterInit",
callback);
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(db->Flush(FlushOptions()));
// value1 should be compact out.
VerifyInternalKeys({{"key1", "value2", v2_seq, kTypeValue}});
db->ReleaseSnapshot(s2);
SyncPoint::GetInstance()->ClearAllCallBacks();
}
TEST_P(WritePreparedTransactionTest, ReleaseEarliestSnapshotDuringCompaction) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 0; // minimum commit cache
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1"));
auto* transaction =
db->BeginTransaction(WriteOptions(), TransactionOptions(), nullptr);
ASSERT_OK(transaction->SetName("txn"));
ASSERT_OK(transaction->Delete("key1"));
ASSERT_OK(transaction->Prepare());
SequenceNumber del_seq = db->GetLatestSequenceNumber();
auto snapshot1 = db->GetSnapshot();
// Increment sequence number.
ASSERT_OK(db->Put(WriteOptions(), "key2", "value2"));
auto snapshot2 = db->GetSnapshot();
ASSERT_OK(transaction->Commit());
delete transaction;
VerifyKeys({{"key1", "NOT_FOUND"}});
VerifyKeys({{"key1", "value1"}}, snapshot1);
VerifyKeys({{"key1", "value1"}}, snapshot2);
ASSERT_OK(db->Flush(FlushOptions()));
auto callback = [&](void* compaction) {
// Release snapshot1 after CompactionIterator init.
// CompactionIterator need to double check and find out snapshot2 is now
// the earliest existing snapshot.
if (compaction != nullptr) {
db->ReleaseSnapshot(snapshot1);
// Add some keys to advance max_evicted_seq.
ASSERT_OK(db->Put(WriteOptions(), "key3", "value3"));
ASSERT_OK(db->Put(WriteOptions(), "key4", "value4"));
}
};
SyncPoint::GetInstance()->SetCallBack("CompactionIterator:AfterInit",
callback);
SyncPoint::GetInstance()->EnableProcessing();
// Dummy keys to avoid compaction trivially move files and get around actual
// compaction logic.
ASSERT_OK(db->Put(WriteOptions(), "a", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "z", "dummy"));
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
// Only verify for key1. Both the put and delete for the key should be kept.
// Since the delete tombstone is not visible to snapshot2, we need to keep
// at least one version of the key, for write-conflict check.
VerifyInternalKeys({{"key1", "", del_seq, kTypeDeletion},
{"key1", "value1", 0, kTypeValue}});
db->ReleaseSnapshot(snapshot2);
SyncPoint::GetInstance()->ClearAllCallBacks();
}
// A more complex test to verify compaction/flush should keep keys visible
// to snapshots.
TEST_P(WritePreparedTransactionTest,
CompactionShouldKeepSnapshotVisibleKeysRandomized) {
constexpr size_t kNumTransactions = 10;
constexpr size_t kNumIterations = 1000;
std::vector<Transaction*> transactions(kNumTransactions, nullptr);
std::vector<size_t> versions(kNumTransactions, 0);
std::unordered_map<std::string, std::string> current_data;
std::vector<const Snapshot*> snapshots;
std::vector<std::unordered_map<std::string, std::string>> snapshot_data;
Random rnd(1103);
options.disable_auto_compactions = true;
ReOpen();
for (size_t i = 0; i < kNumTransactions; i++) {
std::string key = "key" + ToString(i);
std::string value = "value0";
ASSERT_OK(db->Put(WriteOptions(), key, value));
current_data[key] = value;
}
VerifyKeys(current_data);
for (size_t iter = 0; iter < kNumIterations; iter++) {
auto r = rnd.Next() % (kNumTransactions + 1);
if (r < kNumTransactions) {
std::string key = "key" + ToString(r);
if (transactions[r] == nullptr) {
std::string value = "value" + ToString(versions[r] + 1);
auto* txn = db->BeginTransaction(WriteOptions());
ASSERT_OK(txn->SetName("txn" + ToString(r)));
ASSERT_OK(txn->Put(key, value));
ASSERT_OK(txn->Prepare());
transactions[r] = txn;
} else {
std::string value = "value" + ToString(++versions[r]);
ASSERT_OK(transactions[r]->Commit());
delete transactions[r];
transactions[r] = nullptr;
current_data[key] = value;
}
} else {
auto* snapshot = db->GetSnapshot();
VerifyKeys(current_data, snapshot);
snapshots.push_back(snapshot);
snapshot_data.push_back(current_data);
}
VerifyKeys(current_data);
}
// Take a last snapshot to test compaction with uncommitted prepared
// transaction.
snapshots.push_back(db->GetSnapshot());
snapshot_data.push_back(current_data);
assert(snapshots.size() == snapshot_data.size());
for (size_t i = 0; i < snapshots.size(); i++) {
VerifyKeys(snapshot_data[i], snapshots[i]);
}
ASSERT_OK(db->Flush(FlushOptions()));
for (size_t i = 0; i < snapshots.size(); i++) {
VerifyKeys(snapshot_data[i], snapshots[i]);
}
// Dummy keys to avoid compaction trivially move files and get around actual
// compaction logic.
ASSERT_OK(db->Put(WriteOptions(), "a", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "z", "dummy"));
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
for (size_t i = 0; i < snapshots.size(); i++) {
VerifyKeys(snapshot_data[i], snapshots[i]);
}
// cleanup
for (size_t i = 0; i < kNumTransactions; i++) {
if (transactions[i] == nullptr) {
continue;
}
ASSERT_OK(transactions[i]->Commit());
delete transactions[i];
}
for (size_t i = 0; i < snapshots.size(); i++) {
db->ReleaseSnapshot(snapshots[i]);
}
}
// Compaction should not apply the optimization to output key with sequence
// number equal to 0 if the key is not visible to earliest snapshot, based on
// commit sequence number.
TEST_P(WritePreparedTransactionTest,
CompactionShouldKeepSequenceForUncommittedKeys) {
options.disable_auto_compactions = true;
ReOpen();
// Keep track of expected sequence number.
SequenceNumber expected_seq = 0;
auto* transaction = db->BeginTransaction(WriteOptions());
ASSERT_OK(transaction->SetName("txn"));
ASSERT_OK(transaction->Put("key1", "value1"));
ASSERT_OK(transaction->Prepare());
ASSERT_EQ(++expected_seq, db->GetLatestSequenceNumber());
SequenceNumber seq1 = expected_seq;
ASSERT_OK(db->Put(WriteOptions(), "key2", "value2"));
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
expected_seq++; // one for data
if (options.two_write_queues) {
expected_seq++; // one for commit
}
ASSERT_EQ(expected_seq, db_impl->TEST_GetLastVisibleSequence());
ASSERT_OK(db->Flush(FlushOptions()));
// Dummy keys to avoid compaction trivially move files and get around actual
// compaction logic.
ASSERT_OK(db->Put(WriteOptions(), "a", "dummy"));
ASSERT_OK(db->Put(WriteOptions(), "z", "dummy"));
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
VerifyKeys({
{"key1", "NOT_FOUND"},
{"key2", "value2"},
});
VerifyInternalKeys({
// "key1" has not been committed. It keeps its sequence number.
{"key1", "value1", seq1, kTypeValue},
// "key2" is committed and output with seq = 0.
{"key2", "value2", 0, kTypeValue},
});
ASSERT_OK(transaction->Commit());
VerifyKeys({
{"key1", "value1"},
{"key2", "value2"},
});
delete transaction;
}
TEST_P(WritePreparedTransactionTest, CommitAndSnapshotDuringCompaction) {
options.disable_auto_compactions = true;
ReOpen();
const Snapshot* snapshot = nullptr;
ASSERT_OK(db->Put(WriteOptions(), "key1", "value1"));
auto* txn = db->BeginTransaction(WriteOptions());
ASSERT_OK(txn->SetName("txn"));
ASSERT_OK(txn->Put("key1", "value2"));
ASSERT_OK(txn->Prepare());
auto callback = [&](void*) {
// Snapshot is taken after compaction start. It should be taken into
// consideration for whether to compact out value1.
snapshot = db->GetSnapshot();
ASSERT_OK(txn->Commit());
delete txn;
};
SyncPoint::GetInstance()->SetCallBack("CompactionIterator:AfterInit",
callback);
SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(db->Flush(FlushOptions()));
ASSERT_NE(nullptr, snapshot);
VerifyKeys({{"key1", "value2"}});
VerifyKeys({{"key1", "value1"}}, snapshot);
db->ReleaseSnapshot(snapshot);
}
TEST_P(WritePreparedTransactionTest, Iterate) {
auto verify_state = [](Iterator* iter, const std::string& key,
const std::string& value) {
ASSERT_TRUE(iter->Valid());
ASSERT_OK(iter->status());
ASSERT_EQ(key, iter->key().ToString());
ASSERT_EQ(value, iter->value().ToString());
};
auto verify_iter = [&](const std::string& expected_val) {
// Get iterator from a concurrent transaction and make sure it has the
// same view as an iterator from the DB.
auto* txn = db->BeginTransaction(WriteOptions());
for (int i = 0; i < 2; i++) {
Iterator* iter = (i == 0)
? db->NewIterator(ReadOptions())
: txn->GetIterator(ReadOptions());
// Seek
iter->Seek("foo");
verify_state(iter, "foo", expected_val);
// Next
iter->Seek("a");
verify_state(iter, "a", "va");
iter->Next();
verify_state(iter, "foo", expected_val);
// SeekForPrev
iter->SeekForPrev("y");
verify_state(iter, "foo", expected_val);
// Prev
iter->SeekForPrev("z");
verify_state(iter, "z", "vz");
iter->Prev();
verify_state(iter, "foo", expected_val);
delete iter;
}
delete txn;
};
ASSERT_OK(db->Put(WriteOptions(), "foo", "v1"));
auto* transaction = db->BeginTransaction(WriteOptions());
ASSERT_OK(transaction->SetName("txn"));
ASSERT_OK(transaction->Put("foo", "v2"));
ASSERT_OK(transaction->Prepare());
VerifyKeys({{"foo", "v1"}});
// dummy keys
ASSERT_OK(db->Put(WriteOptions(), "a", "va"));
ASSERT_OK(db->Put(WriteOptions(), "z", "vz"));
verify_iter("v1");
ASSERT_OK(transaction->Commit());
VerifyKeys({{"foo", "v2"}});
verify_iter("v2");
delete transaction;
}
TEST_P(WritePreparedTransactionTest, IteratorRefreshNotSupported) {
Iterator* iter = db->NewIterator(ReadOptions());
ASSERT_TRUE(iter->Refresh().IsNotSupported());
delete iter;
}
// Committing an delayed prepared has two non-atomic steps: update commit cache,
// remove seq from delayed_prepared_. The read in IsInSnapshot also involves two
// non-atomic steps of checking these two data structures. This test breaks each
// in the middle to ensure correctness in spite of non-atomic execution.
// Note: This test is limitted to the case where snapshot is larger than the
// max_evicted_seq_.
TEST_P(WritePreparedTransactionTest, NonAtomicCommitOfDelayedPrepared) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 3; // 8 entries
for (auto split_read : {true, false}) {
std::vector<bool> split_options = {false};
if (split_read) {
// Also test for break before mutex
split_options.push_back(true);
}
for (auto split_before_mutex : split_options) {
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
// Fill up the commit cache
std::string init_value("value1");
for (int i = 0; i < 10; i++) {
db->Put(WriteOptions(), Slice("key1"), Slice(init_value));
}
// Prepare a transaction but do not commit it
Transaction* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn->SetName("xid"));
ASSERT_OK(txn->Put(Slice("key1"), Slice("value2")));
ASSERT_OK(txn->Prepare());
// Commit a bunch of entries to advance max evicted seq and make the
// prepared a delayed prepared
for (int i = 0; i < 10; i++) {
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
}
// The snapshot should not see the delayed prepared entry
auto snap = db->GetSnapshot();
if (split_read) {
if (split_before_mutex) {
// split before acquiring prepare_mutex_
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"WritePreparedTxnDB::IsInSnapshot:prepared_mutex_:pause",
"AtomicCommitOfDelayedPrepared:Commit:before"},
{"AtomicCommitOfDelayedPrepared:Commit:after",
"WritePreparedTxnDB::IsInSnapshot:prepared_mutex_:resume"}});
} else {
// split right after reading from the commit cache
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"WritePreparedTxnDB::IsInSnapshot:GetCommitEntry:pause",
"AtomicCommitOfDelayedPrepared:Commit:before"},
{"AtomicCommitOfDelayedPrepared:Commit:after",
"WritePreparedTxnDB::IsInSnapshot:GetCommitEntry:resume"}});
}
} else { // split commit
// split right before removing from delayed_prepared_
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"WritePreparedTxnDB::RemovePrepared:pause",
"AtomicCommitOfDelayedPrepared:Read:before"},
{"AtomicCommitOfDelayedPrepared:Read:after",
"WritePreparedTxnDB::RemovePrepared:resume"}});
}
SyncPoint::GetInstance()->EnableProcessing();
rocksdb::port::Thread commit_thread([&]() {
TEST_SYNC_POINT("AtomicCommitOfDelayedPrepared:Commit:before");
ASSERT_OK(txn->Commit());
if (split_before_mutex) {
// Do bunch of inserts to evict the commit entry from the cache. This
// would prevent the 2nd look into commit cache under prepare_mutex_
// to see the commit entry.
auto seq = db_impl->TEST_GetLastVisibleSequence();
size_t tries = 0;
while (wp_db->max_evicted_seq_ < seq && tries < 50) {
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
tries++;
};
ASSERT_LT(tries, 50);
}
TEST_SYNC_POINT("AtomicCommitOfDelayedPrepared:Commit:after");
delete txn;
});
rocksdb::port::Thread read_thread([&]() {
TEST_SYNC_POINT("AtomicCommitOfDelayedPrepared:Read:before");
ReadOptions roptions;
roptions.snapshot = snap;
PinnableSlice value;
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key1", &value);
ASSERT_OK(s);
// It should not see the commit of delayed prepared
ASSERT_TRUE(value == init_value);
TEST_SYNC_POINT("AtomicCommitOfDelayedPrepared:Read:after");
db->ReleaseSnapshot(snap);
});
read_thread.join();
commit_thread.join();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
} // for split_before_mutex
} // for split_read
}
// When max evicted seq advances a prepared seq, it involves two updates: i)
// adding prepared seq to delayed_prepared_, ii) updating max_evicted_seq_.
// ::IsInSnapshot also reads these two values in a non-atomic way. This test
// ensures correctness if the update occurs after ::IsInSnapshot reads
// delayed_prepared_empty_ and before it reads max_evicted_seq_.
// Note: this test focuses on read snapshot larger than max_evicted_seq_.
TEST_P(WritePreparedTransactionTest, NonAtomicUpdateOfDelayedPrepared) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 3; // 8 entries
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
// Fill up the commit cache
std::string init_value("value1");
for (int i = 0; i < 10; i++) {
db->Put(WriteOptions(), Slice("key1"), Slice(init_value));
}
// Prepare a transaction but do not commit it
Transaction* txn = db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn->SetName("xid"));
ASSERT_OK(txn->Put(Slice("key1"), Slice("value2")));
ASSERT_OK(txn->Prepare());
// Create a gap between prepare seq and snapshot seq
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
// The snapshot should not see the delayed prepared entry
auto snap = db->GetSnapshot();
ASSERT_LT(txn->GetId(), snap->GetSequenceNumber());
// split right after reading delayed_prepared_empty_
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"WritePreparedTxnDB::IsInSnapshot:delayed_prepared_empty_:pause",
"AtomicUpdateOfDelayedPrepared:before"},
{"AtomicUpdateOfDelayedPrepared:after",
"WritePreparedTxnDB::IsInSnapshot:delayed_prepared_empty_:resume"}});
SyncPoint::GetInstance()->EnableProcessing();
rocksdb::port::Thread commit_thread([&]() {
TEST_SYNC_POINT("AtomicUpdateOfDelayedPrepared:before");
// Commit a bunch of entries to advance max evicted seq and make the
// prepared a delayed prepared
size_t tries = 0;
while (wp_db->max_evicted_seq_ < txn->GetId() && tries < 50) {
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
tries++;
};
ASSERT_LT(tries, 50);
// This is the case on which the test focuses
ASSERT_LT(wp_db->max_evicted_seq_, snap->GetSequenceNumber());
TEST_SYNC_POINT("AtomicUpdateOfDelayedPrepared:after");
});
rocksdb::port::Thread read_thread([&]() {
ReadOptions roptions;
roptions.snapshot = snap;
PinnableSlice value;
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key1", &value);
ASSERT_OK(s);
// It should not see the uncommitted value of delayed prepared
ASSERT_TRUE(value == init_value);
db->ReleaseSnapshot(snap);
});
read_thread.join();
commit_thread.join();
ASSERT_OK(txn->Commit());
delete txn;
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
}
// Eviction from commit cache and update of max evicted seq are two non-atomic
// steps. Similarly the read of max_evicted_seq_ in ::IsInSnapshot and reading
// from commit cache are two non-atomic steps. This tests if the update occurs
// after reading max_evicted_seq_ and before reading the commit cache.
// Note: the test focuses on snapshot larger than max_evicted_seq_
TEST_P(WritePreparedTransactionTest, NonAtomicUpdateOfMaxEvictedSeq) {
const size_t snapshot_cache_bits = 7; // same as default
const size_t commit_cache_bits = 3; // 8 entries
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
// Fill up the commit cache
std::string init_value("value1");
std::string last_value("value_final");
for (int i = 0; i < 10; i++) {
db->Put(WriteOptions(), Slice("key1"), Slice(init_value));
}
// Do an uncommitted write to prevent min_uncommitted optimization
Transaction* txn1 =
db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn1->SetName("xid1"));
ASSERT_OK(txn1->Put(Slice("key0"), last_value));
ASSERT_OK(txn1->Prepare());
// Do a write with prepare to get the prepare seq
Transaction* txn = db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn->SetName("xid"));
ASSERT_OK(txn->Put(Slice("key1"), last_value));
ASSERT_OK(txn->Prepare());
ASSERT_OK(txn->Commit());
// Create a gap between commit entry and snapshot seq
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
// The snapshot should see the last commit
auto snap = db->GetSnapshot();
ASSERT_LE(txn->GetId(), snap->GetSequenceNumber());
// split right after reading max_evicted_seq_
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"WritePreparedTxnDB::IsInSnapshot:max_evicted_seq_:pause",
"NonAtomicUpdateOfMaxEvictedSeq:before"},
{"NonAtomicUpdateOfMaxEvictedSeq:after",
"WritePreparedTxnDB::IsInSnapshot:max_evicted_seq_:resume"}});
SyncPoint::GetInstance()->EnableProcessing();
rocksdb::port::Thread commit_thread([&]() {
TEST_SYNC_POINT("NonAtomicUpdateOfMaxEvictedSeq:before");
// Commit a bunch of entries to advance max evicted seq beyond txn->GetId()
size_t tries = 0;
while (wp_db->max_evicted_seq_ < txn->GetId() && tries < 50) {
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
tries++;
};
ASSERT_LT(tries, 50);
// This is the case on which the test focuses
ASSERT_LT(wp_db->max_evicted_seq_, snap->GetSequenceNumber());
TEST_SYNC_POINT("NonAtomicUpdateOfMaxEvictedSeq:after");
});
rocksdb::port::Thread read_thread([&]() {
ReadOptions roptions;
roptions.snapshot = snap;
PinnableSlice value;
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key1", &value);
ASSERT_OK(s);
// It should see the committed value of the evicted entry
ASSERT_TRUE(value == last_value);
db->ReleaseSnapshot(snap);
});
read_thread.join();
commit_thread.join();
delete txn;
txn1->Commit();
delete txn1;
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
}
// Test when we add a prepared seq when the max_evicted_seq_ already goes beyond
// that. The test focuses on a race condition between AddPrepared and
// AdvanceMaxEvictedSeq functions.
TEST_P(WritePreparedTransactionTest, AddPreparedBeforeMax) {
if (!options.two_write_queues) {
// This test is only for two write queues
return;
}
const size_t snapshot_cache_bits = 7; // same as default
// 1 entry to advance max after the 2nd commit
const size_t commit_cache_bits = 0;
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
WritePreparedTxnDB* wp_db = dynamic_cast<WritePreparedTxnDB*>(db);
std::string some_value("value_some");
std::string uncommitted_value("value_uncommitted");
// Prepare two uncommitted transactions
Transaction* txn1 =
db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn1->SetName("xid1"));
ASSERT_OK(txn1->Put(Slice("key1"), some_value));
ASSERT_OK(txn1->Prepare());
Transaction* txn2 =
db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn2->SetName("xid2"));
ASSERT_OK(txn2->Put(Slice("key2"), some_value));
ASSERT_OK(txn2->Prepare());
// Start the txn here so the other thread could get its id
Transaction* txn = db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn->SetName("xid"));
ASSERT_OK(txn->Put(Slice("key0"), uncommitted_value));
port::Mutex txn_mutex_;
// t1) Insert prepared entry, t2) commit other entries to advance max
// evicted sec and finish checking the existing prepared entries, t1)
// AddPrepared, t2) update max_evicted_seq_
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"AddPreparedCallback::AddPrepared::begin:pause",
"AddPreparedBeforeMax::read_thread:start"},
{"AdvanceMaxEvictedSeq::update_max:pause",
"AddPreparedCallback::AddPrepared::begin:resume"},
{"AddPreparedCallback::AddPrepared::end",
"AdvanceMaxEvictedSeq::update_max:resume"},
});
SyncPoint::GetInstance()->EnableProcessing();
rocksdb::port::Thread write_thread([&]() {
txn_mutex_.Lock();
ASSERT_OK(txn->Prepare());
txn_mutex_.Unlock();
});
rocksdb::port::Thread read_thread([&]() {
TEST_SYNC_POINT("AddPreparedBeforeMax::read_thread:start");
// Publish seq number with a commit
ASSERT_OK(txn1->Commit());
// Since the commit cache size is one the 2nd commit evict the 1st one and
// invokes AdcanceMaxEvictedSeq
ASSERT_OK(txn2->Commit());
ReadOptions roptions;
PinnableSlice value;
// The snapshot should not see the uncommitted value from write_thread
auto snap = db->GetSnapshot();
ASSERT_LT(wp_db->max_evicted_seq_, snap->GetSequenceNumber());
// This is the scenario that we test for
txn_mutex_.Lock();
ASSERT_GT(wp_db->max_evicted_seq_, txn->GetId());
txn_mutex_.Unlock();
roptions.snapshot = snap;
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key0", &value);
ASSERT_TRUE(s.IsNotFound());
db->ReleaseSnapshot(snap);
});
read_thread.join();
write_thread.join();
delete txn1;
delete txn2;
ASSERT_OK(txn->Commit());
delete txn;
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
}
// When an old prepared entry gets committed, there is a gap between the time
// that it is published and when it is cleaned up from old_prepared_. This test
// stresses such cases.
TEST_P(WritePreparedTransactionTest, CommitOfDelayedPrepared) {
const size_t snapshot_cache_bits = 7; // same as default
for (const size_t commit_cache_bits : {0, 2, 3}) {
for (const size_t sub_batch_cnt : {1, 2, 3}) {
UpdateTransactionDBOptions(snapshot_cache_bits, commit_cache_bits);
ReOpen();
std::atomic<const Snapshot*> snap = {nullptr};
std::atomic<SequenceNumber> exp_prepare = {0};
rocksdb::port::Thread callback_thread;
// Value is synchronized via snap
PinnableSlice value;
// Take a snapshot after publish and before RemovePrepared:Start
auto snap_callback = [&]() {
ASSERT_EQ(nullptr, snap.load());
snap.store(db->GetSnapshot());
ReadOptions roptions;
roptions.snapshot = snap.load();
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key", &value);
ASSERT_OK(s);
};
auto callback = [&](void* param) {
SequenceNumber prep_seq = *((SequenceNumber*)param);
if (prep_seq == exp_prepare.load()) { // only for write_thread
// We need to spawn a thread to avoid deadlock since getting a
// snpashot might end up calling AdvanceSeqByOne which needs joining
// the write queue.
callback_thread = rocksdb::port::Thread(snap_callback);
TEST_SYNC_POINT("callback:end");
}
};
// Wait for the first snapshot be taken in GetSnapshotInternal. Although
// it might be updated before GetSnapshotInternal finishes but this should
// cover most of the cases.
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"WritePreparedTxnDB::GetSnapshotInternal:first", "callback:end"},
});
SyncPoint::GetInstance()->SetCallBack("RemovePrepared:Start", callback);
SyncPoint::GetInstance()->EnableProcessing();
// Thread to cause frequent evictions
rocksdb::port::Thread eviction_thread([&]() {
// Too many txns might cause commit_seq - prepare_seq in another thread
// to go beyond DELTA_UPPERBOUND
for (int i = 0; i < 25 * (1 << commit_cache_bits); i++) {
db->Put(WriteOptions(), Slice("key1"), Slice("value1"));
}
});
rocksdb::port::Thread write_thread([&]() {
for (int i = 0; i < 25 * (1 << commit_cache_bits); i++) {
Transaction* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn->SetName("xid"));
std::string val_str = "value" + ToString(i);
for (size_t b = 0; b < sub_batch_cnt; b++) {
ASSERT_OK(txn->Put(Slice("key"), val_str));
}
ASSERT_OK(txn->Prepare());
// Let an eviction to kick in
std::this_thread::yield();
exp_prepare.store(txn->GetId());
ASSERT_OK(txn->Commit());
delete txn;
// Wait for the snapshot taking that is triggered by
// RemovePrepared:Start callback
callback_thread.join();
// Read with the snapshot taken before delayed_prepared_ cleanup
ReadOptions roptions;
roptions.snapshot = snap.load();
ASSERT_NE(nullptr, roptions.snapshot);
PinnableSlice value2;
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key", &value2);
ASSERT_OK(s);
// It should see its own write
ASSERT_TRUE(val_str == value2);
// The value read by snapshot should not change
ASSERT_STREQ(value2.ToString().c_str(), value.ToString().c_str());
db->ReleaseSnapshot(roptions.snapshot);
snap.store(nullptr);
}
});
write_thread.join();
eviction_thread.join();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
}
}
}
// Test that updating the commit map will not affect the existing snapshots
TEST_P(WritePreparedTransactionTest, AtomicCommit) {
for (bool skip_prepare : {true, false}) {
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"WritePreparedTxnDB::AddCommitted:start",
"AtomicCommit::GetSnapshot:start"},
{"AtomicCommit::Get:end",
"WritePreparedTxnDB::AddCommitted:start:pause"},
{"WritePreparedTxnDB::AddCommitted:end", "AtomicCommit::Get2:start"},
{"AtomicCommit::Get2:end",
"WritePreparedTxnDB::AddCommitted:end:pause:"},
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
rocksdb::port::Thread write_thread([&]() {
if (skip_prepare) {
db->Put(WriteOptions(), Slice("key"), Slice("value"));
} else {
Transaction* txn =
db->BeginTransaction(WriteOptions(), TransactionOptions());
ASSERT_OK(txn->SetName("xid"));
ASSERT_OK(txn->Put(Slice("key"), Slice("value")));
ASSERT_OK(txn->Prepare());
ASSERT_OK(txn->Commit());
delete txn;
}
});
rocksdb::port::Thread read_thread([&]() {
ReadOptions roptions;
TEST_SYNC_POINT("AtomicCommit::GetSnapshot:start");
roptions.snapshot = db->GetSnapshot();
PinnableSlice val;
auto s = db->Get(roptions, db->DefaultColumnFamily(), "key", &val);
TEST_SYNC_POINT("AtomicCommit::Get:end");
TEST_SYNC_POINT("AtomicCommit::Get2:start");
ASSERT_SAME(roptions, db, s, val, "key");
TEST_SYNC_POINT("AtomicCommit::Get2:end");
db->ReleaseSnapshot(roptions.snapshot);
});
read_thread.join();
write_thread.join();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
}
// Test that we can change write policy from WriteCommitted to WritePrepared
// after a clean shutdown (which would empty the WAL)
TEST_P(WritePreparedTransactionTest, WP_WC_DBBackwardCompatibility) {
bool empty_wal = true;
CrossCompatibilityTest(WRITE_COMMITTED, WRITE_PREPARED, empty_wal);
}
// Test that we fail fast if WAL is not emptied between changing the write
// policy from WriteCommitted to WritePrepared
TEST_P(WritePreparedTransactionTest, WP_WC_WALBackwardIncompatibility) {
bool empty_wal = true;
CrossCompatibilityTest(WRITE_COMMITTED, WRITE_PREPARED, !empty_wal);
}
// Test that we can change write policy from WritePrepare back to WriteCommitted
// after a clean shutdown (which would empty the WAL)
TEST_P(WritePreparedTransactionTest, WC_WP_ForwardCompatibility) {
bool empty_wal = true;
CrossCompatibilityTest(WRITE_PREPARED, WRITE_COMMITTED, empty_wal);
}
// Test that we fail fast if WAL is not emptied between changing the write
// policy from WriteCommitted to WritePrepared
TEST_P(WritePreparedTransactionTest, WC_WP_WALForwardIncompatibility) {
bool empty_wal = true;
CrossCompatibilityTest(WRITE_PREPARED, WRITE_COMMITTED, !empty_wal);
}
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
#else
#include <stdio.h>
int main(int /*argc*/, char** /*argv*/) {
fprintf(stderr,
"SKIPPED as Transactions are not supported in ROCKSDB_LITE\n");
return 0;
}
#endif // ROCKSDB_LITE
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