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optimistic_transaction_test.cc
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#ifndef ROCKSDB_LITE
#include <functional>
#include <string>
#include <thread>
#include "db/db_impl/db_impl.h"
#include "db/db_test_util.h"
#include "port/port.h"
#include "rocksdb/db.h"
#include "rocksdb/perf_context.h"
#include "rocksdb/utilities/optimistic_transaction_db.h"
#include "rocksdb/utilities/transaction.h"
#include "test_util/sync_point.h"
#include "test_util/testharness.h"
#include "test_util/transaction_test_util.h"
#include "util/crc32c.h"
#include "util/random.h"
using std::string;
namespace ROCKSDB_NAMESPACE {
class OptimisticTransactionTest
: public testing::Test,
public testing::WithParamInterface<OccValidationPolicy> {
public:
OptimisticTransactionDB* txn_db;
string dbname;
Options options;
OptimisticTransactionTest() {
options.create_if_missing = true;
options.max_write_buffer_number = 2;
options.max_write_buffer_size_to_maintain = 1600;
options.merge_operator.reset(new TestPutOperator());
dbname = test::PerThreadDBPath("optimistic_transaction_testdb");
DestroyDB(dbname, options);
Open();
}
~OptimisticTransactionTest() override {
delete txn_db;
DestroyDB(dbname, options);
}
void Reopen() {
delete txn_db;
txn_db = nullptr;
Open();
}
private:
void Open() {
ColumnFamilyOptions cf_options(options);
OptimisticTransactionDBOptions occ_opts;
occ_opts.validate_policy = GetParam();
std::vector<ColumnFamilyDescriptor> column_families;
std::vector<ColumnFamilyHandle*> handles;
column_families.push_back(
ColumnFamilyDescriptor(kDefaultColumnFamilyName, cf_options));
Status s =
OptimisticTransactionDB::Open(DBOptions(options), occ_opts, dbname,
column_families, &handles, &txn_db);
ASSERT_OK(s);
ASSERT_NE(txn_db, nullptr);
ASSERT_EQ(handles.size(), 1);
delete handles[0];
}
};
TEST_P(OptimisticTransactionTest, SuccessTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, Slice("foo"), Slice("bar")));
ASSERT_OK(txn_db->Put(write_options, Slice("foo2"), Slice("bar")));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
ASSERT_OK(txn->GetForUpdate(read_options, "foo", &value));
ASSERT_EQ(value, "bar");
ASSERT_OK(txn->Put(Slice("foo"), Slice("bar2")));
ASSERT_OK(txn->GetForUpdate(read_options, "foo", &value));
ASSERT_EQ(value, "bar2");
ASSERT_OK(txn->Commit());
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "bar2");
delete txn;
}
TEST_P(OptimisticTransactionTest, WriteConflictTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, "foo", "bar"));
ASSERT_OK(txn_db->Put(write_options, "foo2", "bar"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
ASSERT_OK(txn->Put("foo", "bar2"));
// This Put outside of a transaction will conflict with the previous write
ASSERT_OK(txn_db->Put(write_options, "foo", "barz"));
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "barz");
ASSERT_EQ(1, txn->GetNumKeys());
Status s = txn->Commit();
ASSERT_TRUE(s.IsBusy()); // Txn should not commit
// Verify that transaction did not write anything
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "barz");
ASSERT_OK(txn_db->Get(read_options, "foo2", &value));
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_P(OptimisticTransactionTest, WriteConflictTest2) {
WriteOptions write_options;
ReadOptions read_options;
OptimisticTransactionOptions txn_options;
string value;
ASSERT_OK(txn_db->Put(write_options, "foo", "bar"));
ASSERT_OK(txn_db->Put(write_options, "foo2", "bar"));
txn_options.set_snapshot = true;
Transaction* txn = txn_db->BeginTransaction(write_options, txn_options);
ASSERT_NE(txn, nullptr);
// This Put outside of a transaction will conflict with a later write
ASSERT_OK(txn_db->Put(write_options, "foo", "barz"));
ASSERT_OK(txn->Put(
"foo", "bar2")); // Conflicts with write done after snapshot taken
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "barz");
Status s = txn->Commit();
ASSERT_TRUE(s.IsBusy()); // Txn should not commit
// Verify that transaction did not write anything
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "barz");
ASSERT_OK(txn_db->Get(read_options, "foo2", &value));
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_P(OptimisticTransactionTest, ReadConflictTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
ASSERT_OK(txn_db->Put(write_options, "foo", "bar"));
ASSERT_OK(txn_db->Put(write_options, "foo2", "bar"));
txn_options.set_snapshot = true;
Transaction* txn = txn_db->BeginTransaction(write_options, txn_options);
ASSERT_NE(txn, nullptr);
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "foo", &value));
ASSERT_EQ(value, "bar");
// This Put outside of a transaction will conflict with the previous read
ASSERT_OK(txn_db->Put(write_options, "foo", "barz"));
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "barz");
Status s = txn->Commit();
ASSERT_TRUE(s.IsBusy()); // Txn should not commit
// Verify that transaction did not write anything
ASSERT_OK(txn->GetForUpdate(read_options, "foo", &value));
ASSERT_EQ(value, "barz");
ASSERT_OK(txn->GetForUpdate(read_options, "foo2", &value));
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_P(OptimisticTransactionTest, TxnOnlyTest) {
// Test to make sure transactions work when there are no other writes in an
// empty db.
WriteOptions write_options;
ReadOptions read_options;
string value;
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
ASSERT_OK(txn->Put("x", "y"));
ASSERT_OK(txn->Commit());
delete txn;
}
TEST_P(OptimisticTransactionTest, FlushTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, Slice("foo"), Slice("bar")));
ASSERT_OK(txn_db->Put(write_options, Slice("foo2"), Slice("bar")));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
snapshot_read_options.snapshot = txn->GetSnapshot();
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "foo", &value));
ASSERT_EQ(value, "bar");
ASSERT_OK(txn->Put(Slice("foo"), Slice("bar2")));
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "foo", &value));
ASSERT_EQ(value, "bar2");
// Put a random key so we have a memtable to flush
ASSERT_OK(txn_db->Put(write_options, "dummy", "dummy"));
// force a memtable flush
FlushOptions flush_ops;
ASSERT_OK(txn_db->Flush(flush_ops));
// txn should commit since the flushed table is still in MemtableList History
ASSERT_OK(txn->Commit());
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "bar2");
delete txn;
}
TEST_P(OptimisticTransactionTest, FlushTest2) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, Slice("foo"), Slice("bar")));
ASSERT_OK(txn_db->Put(write_options, Slice("foo2"), Slice("bar")));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
snapshot_read_options.snapshot = txn->GetSnapshot();
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "foo", &value));
ASSERT_EQ(value, "bar");
ASSERT_OK(txn->Put(Slice("foo"), Slice("bar2")));
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "foo", &value));
ASSERT_EQ(value, "bar2");
// Put a random key so we have a MemTable to flush
ASSERT_OK(txn_db->Put(write_options, "dummy", "dummy"));
// force a memtable flush
FlushOptions flush_ops;
ASSERT_OK(txn_db->Flush(flush_ops));
// Put a random key so we have a MemTable to flush
ASSERT_OK(txn_db->Put(write_options, "dummy", "dummy2"));
// force a memtable flush
ASSERT_OK(txn_db->Flush(flush_ops));
ASSERT_OK(txn_db->Put(write_options, "dummy", "dummy3"));
// force a memtable flush
// Since our test db has max_write_buffer_number=2, this flush will cause
// the first memtable to get purged from the MemtableList history.
ASSERT_OK(txn_db->Flush(flush_ops));
Status s = txn->Commit();
// txn should not commit since MemTableList History is not large enough
ASSERT_TRUE(s.IsTryAgain());
ASSERT_OK(txn_db->Get(read_options, "foo", &value));
ASSERT_EQ(value, "bar");
delete txn;
}
// Trigger the condition where some old memtables are skipped when doing
// TransactionUtil::CheckKey(), and make sure the result is still correct.
TEST_P(OptimisticTransactionTest, 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;
ReadOptions snapshot_read_options;
ReadOptions snapshot_read_options2;
string value;
ASSERT_OK(txn_db->Put(write_options, Slice("foo"), Slice("bar")));
ASSERT_OK(txn_db->Put(write_options, Slice("foo2"), Slice("bar")));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn != nullptr);
Transaction* txn2 = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn2 != nullptr);
snapshot_read_options.snapshot = txn->GetSnapshot();
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "foo", &value));
ASSERT_EQ(value, "bar");
ASSERT_OK(txn->Put(Slice("foo"), Slice("bar2")));
snapshot_read_options2.snapshot = txn2->GetSnapshot();
ASSERT_OK(txn2->GetForUpdate(snapshot_read_options2, "foo2", &value));
ASSERT_EQ(value, "bar");
ASSERT_OK(txn2->Put(Slice("foo2"), Slice("bar2")));
// txn updates "foo" and txn2 updates "foo2", and now a write is
// issued for "foo", which conflicts with txn but not txn2
ASSERT_OK(txn_db->Put(write_options, "foo", "bar"));
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_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
{{"OptimisticTransactionTest.CheckKeySkipOldMemtable",
"FlushJob::Start"}});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
}
// force a memtable flush. The memtable should still be kept
FlushOptions flush_ops;
if (attempt == kAttemptHistoryMemtable) {
ASSERT_OK(txn_db->Flush(flush_ops));
} else {
ASSERT_EQ(attempt, kAttemptImmMemTable);
DBImpl* db_impl = static_cast<DBImpl*>(txn_db->GetRootDB());
ASSERT_OK(db_impl->TEST_SwitchMemtable());
}
uint64_t num_imm_mems;
ASSERT_TRUE(txn_db->GetIntProperty(DB::Properties::kNumImmutableMemTable,
&num_imm_mems));
if (attempt == kAttemptHistoryMemtable) {
ASSERT_EQ(0, num_imm_mems);
} else {
ASSERT_EQ(attempt, kAttemptImmMemTable);
ASSERT_EQ(1, num_imm_mems);
}
// Put something in active memtable
ASSERT_OK(txn_db->Put(write_options, Slice("foo3"), Slice("bar")));
// Create txn3 after flushing, when this transaction is commited,
// only need to check the active memtable
Transaction* txn3 = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn3 != nullptr);
// Commit both of txn and txn2. txn will conflict but txn2 will
// pass. In both ways, both memtables are queried.
SetPerfLevel(PerfLevel::kEnableCount);
get_perf_context()->Reset();
Status s = txn->Commit();
// We should have checked two memtables
ASSERT_EQ(2, get_perf_context()->get_from_memtable_count);
// txn should fail because of conflict, even if the memtable
// has flushed, because it is still preserved in history.
ASSERT_TRUE(s.IsBusy());
get_perf_context()->Reset();
s = txn2->Commit();
// We should have checked two memtables
ASSERT_EQ(2, get_perf_context()->get_from_memtable_count);
ASSERT_TRUE(s.ok());
ASSERT_OK(txn3->Put(Slice("foo2"), Slice("bar2")));
get_perf_context()->Reset();
s = txn3->Commit();
// txn3 is created after the active memtable is created, so that is the only
// memtable to check.
ASSERT_EQ(1, get_perf_context()->get_from_memtable_count);
ASSERT_TRUE(s.ok());
TEST_SYNC_POINT("OptimisticTransactionTest.CheckKeySkipOldMemtable");
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
SetPerfLevel(PerfLevel::kDisable);
delete txn;
delete txn2;
delete txn3;
}
}
TEST_P(OptimisticTransactionTest, NoSnapshotTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, "AAA", "bar"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
// Modify key after transaction start
ASSERT_OK(txn_db->Put(write_options, "AAA", "bar1"));
// Read and write without a snapshot
ASSERT_OK(txn->GetForUpdate(read_options, "AAA", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn->Put("AAA", "bar2"));
// Should commit since read/write was done after data changed
ASSERT_OK(txn->Commit());
ASSERT_OK(txn->GetForUpdate(read_options, "AAA", &value));
ASSERT_EQ(value, "bar2");
delete txn;
}
TEST_P(OptimisticTransactionTest, MultipleSnapshotTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, "AAA", "bar"));
ASSERT_OK(txn_db->Put(write_options, "BBB", "bar"));
ASSERT_OK(txn_db->Put(write_options, "CCC", "bar"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
ASSERT_OK(txn_db->Put(write_options, "AAA", "bar1"));
// Read and write without a snapshot
ASSERT_OK(txn->GetForUpdate(read_options, "AAA", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn->Put("AAA", "bar2"));
// Modify BBB before snapshot is taken
ASSERT_OK(txn_db->Put(write_options, "BBB", "bar1"));
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
// Read and write with snapshot
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "BBB", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn->Put("BBB", "bar2"));
ASSERT_OK(txn_db->Put(write_options, "CCC", "bar1"));
// Set a new snapshot
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
// Read and write with snapshot
ASSERT_OK(txn->GetForUpdate(snapshot_read_options, "CCC", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn->Put("CCC", "bar2"));
ASSERT_OK(txn->GetForUpdate(read_options, "AAA", &value));
ASSERT_EQ(value, "bar2");
ASSERT_OK(txn->GetForUpdate(read_options, "BBB", &value));
ASSERT_EQ(value, "bar2");
ASSERT_OK(txn->GetForUpdate(read_options, "CCC", &value));
ASSERT_EQ(value, "bar2");
ASSERT_OK(txn_db->Get(read_options, "AAA", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn_db->Get(read_options, "BBB", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn_db->Get(read_options, "CCC", &value));
ASSERT_EQ(value, "bar1");
ASSERT_OK(txn->Commit());
ASSERT_OK(txn_db->Get(read_options, "AAA", &value));
ASSERT_EQ(value, "bar2");
ASSERT_OK(txn_db->Get(read_options, "BBB", &value));
ASSERT_EQ(value, "bar2");
ASSERT_OK(txn_db->Get(read_options, "CCC", &value));
ASSERT_EQ(value, "bar2");
// verify that we track multiple writes to the same key at different snapshots
delete txn;
txn = txn_db->BeginTransaction(write_options);
// Potentially conflicting writes
ASSERT_OK(txn_db->Put(write_options, "ZZZ", "zzz"));
ASSERT_OK(txn_db->Put(write_options, "XXX", "xxx"));
txn->SetSnapshot();
OptimisticTransactionOptions txn_options;
txn_options.set_snapshot = true;
Transaction* txn2 = txn_db->BeginTransaction(write_options, txn_options);
txn2->SetSnapshot();
// This should not conflict in txn since the snapshot is later than the
// previous write (spoiler alert: it will later conflict with txn2).
ASSERT_OK(txn->Put("ZZZ", "zzzz"));
ASSERT_OK(txn->Commit());
delete txn;
// This will conflict since the snapshot is earlier than another write to ZZZ
ASSERT_OK(txn2->Put("ZZZ", "xxxxx"));
Status s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn2;
}
TEST_P(OptimisticTransactionTest, ColumnFamiliesTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
ColumnFamilyHandle *cfa, *cfb;
ColumnFamilyOptions cf_options;
// Create 2 new column families
ASSERT_OK(txn_db->CreateColumnFamily(cf_options, "CFA", &cfa));
ASSERT_OK(txn_db->CreateColumnFamily(cf_options, "CFB", &cfb));
delete cfa;
delete cfb;
delete txn_db;
txn_db = nullptr;
// open DB with three column families
std::vector<ColumnFamilyDescriptor> column_families;
// have to open default column family
column_families.push_back(
ColumnFamilyDescriptor(kDefaultColumnFamilyName, ColumnFamilyOptions()));
// open the new column families
column_families.push_back(
ColumnFamilyDescriptor("CFA", ColumnFamilyOptions()));
column_families.push_back(
ColumnFamilyDescriptor("CFB", ColumnFamilyOptions()));
std::vector<ColumnFamilyHandle*> handles;
ASSERT_OK(OptimisticTransactionDB::Open(options, dbname, column_families,
&handles, &txn_db));
assert(txn_db != nullptr);
ASSERT_NE(txn_db, nullptr);
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
txn_options.set_snapshot = true;
Transaction* txn2 = txn_db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn2);
// Write some data to the db
WriteBatch batch;
ASSERT_OK(batch.Put("foo", "foo"));
ASSERT_OK(batch.Put(handles[1], "AAA", "bar"));
ASSERT_OK(batch.Put(handles[1], "AAAZZZ", "bar"));
ASSERT_OK(txn_db->Write(write_options, &batch));
ASSERT_OK(txn_db->Delete(write_options, handles[1], "AAAZZZ"));
// These keys do no conflict with existing writes since they're in
// different column families
ASSERT_OK(txn->Delete("AAA"));
Status s =
txn->GetForUpdate(snapshot_read_options, handles[1], "foo", &value);
ASSERT_TRUE(s.IsNotFound());
Slice key_slice("AAAZZZ");
Slice value_slices[2] = {Slice("bar"), Slice("bar")};
ASSERT_OK(txn->Put(handles[2], SliceParts(&key_slice, 1),
SliceParts(value_slices, 2)));
ASSERT_EQ(3, txn->GetNumKeys());
// Txn should commit
ASSERT_OK(txn->Commit());
s = txn_db->Get(read_options, "AAA", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn_db->Get(read_options, handles[2], "AAAZZZ", &value);
ASSERT_EQ(value, "barbar");
Slice key_slices[3] = {Slice("AAA"), Slice("ZZ"), Slice("Z")};
Slice value_slice("barbarbar");
// This write will cause a conflict with the earlier batch write
ASSERT_OK(txn2->Put(handles[1], SliceParts(key_slices, 3),
SliceParts(&value_slice, 1)));
ASSERT_OK(txn2->Delete(handles[2], "XXX"));
ASSERT_OK(txn2->Delete(handles[1], "XXX"));
s = txn2->GetForUpdate(snapshot_read_options, handles[1], "AAA", &value);
ASSERT_TRUE(s.IsNotFound());
// Verify txn did not commit
s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
s = txn_db->Get(read_options, handles[1], "AAAZZZ", &value);
ASSERT_TRUE(s.IsNotFound());
ASSERT_EQ(value, "barbar");
delete txn;
delete txn2;
txn = txn_db->BeginTransaction(write_options, txn_options);
snapshot_read_options.snapshot = txn->GetSnapshot();
txn2 = txn_db->BeginTransaction(write_options, txn_options);
ASSERT_NE(txn, nullptr);
std::vector<ColumnFamilyHandle*> multiget_cfh = {handles[1], handles[2],
handles[0], handles[2]};
std::vector<Slice> multiget_keys = {"AAA", "AAAZZZ", "foo", "foo"};
std::vector<std::string> values(4);
std::vector<Status> results = txn->MultiGetForUpdate(
snapshot_read_options, multiget_cfh, multiget_keys, &values);
ASSERT_OK(results[0]);
ASSERT_OK(results[1]);
ASSERT_OK(results[2]);
ASSERT_TRUE(results[3].IsNotFound());
ASSERT_EQ(values[0], "bar");
ASSERT_EQ(values[1], "barbar");
ASSERT_EQ(values[2], "foo");
ASSERT_OK(txn->Delete(handles[2], "ZZZ"));
ASSERT_OK(txn->Put(handles[2], "ZZZ", "YYY"));
ASSERT_OK(txn->Put(handles[2], "ZZZ", "YYYY"));
ASSERT_OK(txn->Delete(handles[2], "ZZZ"));
ASSERT_OK(txn->Put(handles[2], "AAAZZZ", "barbarbar"));
ASSERT_EQ(5, txn->GetNumKeys());
// Txn should commit
ASSERT_OK(txn->Commit());
s = txn_db->Get(read_options, handles[2], "ZZZ", &value);
ASSERT_TRUE(s.IsNotFound());
// Put a key which will conflict with the next txn using the previous snapshot
ASSERT_OK(txn_db->Put(write_options, handles[2], "foo", "000"));
results = txn2->MultiGetForUpdate(snapshot_read_options, multiget_cfh,
multiget_keys, &values);
ASSERT_OK(results[0]);
ASSERT_OK(results[1]);
ASSERT_OK(results[2]);
ASSERT_TRUE(results[3].IsNotFound());
ASSERT_EQ(values[0], "bar");
ASSERT_EQ(values[1], "barbar");
ASSERT_EQ(values[2], "foo");
// Verify Txn Did not Commit
s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
s = txn_db->DropColumnFamily(handles[1]);
ASSERT_OK(s);
s = txn_db->DropColumnFamily(handles[2]);
ASSERT_OK(s);
delete txn;
delete txn2;
for (auto handle : handles) {
delete handle;
}
}
TEST_P(OptimisticTransactionTest, EmptyTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
ASSERT_OK(txn_db->Put(write_options, "aaa", "aaa"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn->Commit());
delete txn;
txn = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn->Rollback());
delete txn;
txn = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn->GetForUpdate(read_options, "aaa", &value));
ASSERT_EQ(value, "aaa");
ASSERT_OK(txn->Commit());
delete txn;
txn = txn_db->BeginTransaction(write_options);
txn->SetSnapshot();
ASSERT_OK(txn->GetForUpdate(read_options, "aaa", &value));
ASSERT_EQ(value, "aaa");
ASSERT_OK(txn_db->Put(write_options, "aaa", "xxx"));
Status s = txn->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn;
}
TEST_P(OptimisticTransactionTest, PredicateManyPreceders) {
WriteOptions write_options;
ReadOptions read_options1, read_options2;
OptimisticTransactionOptions txn_options;
string value;
txn_options.set_snapshot = true;
Transaction* txn1 = txn_db->BeginTransaction(write_options, txn_options);
read_options1.snapshot = txn1->GetSnapshot();
Transaction* txn2 = txn_db->BeginTransaction(write_options);
txn2->SetSnapshot();
read_options2.snapshot = txn2->GetSnapshot();
std::vector<Slice> multiget_keys = {"1", "2", "3"};
std::vector<std::string> multiget_values;
std::vector<Status> results =
txn1->MultiGetForUpdate(read_options1, multiget_keys, &multiget_values);
ASSERT_TRUE(results[0].IsNotFound());
ASSERT_TRUE(results[1].IsNotFound());
ASSERT_TRUE(results[2].IsNotFound());
ASSERT_OK(txn2->Put("2", "x"));
ASSERT_OK(txn2->Commit());
multiget_values.clear();
results =
txn1->MultiGetForUpdate(read_options1, multiget_keys, &multiget_values);
ASSERT_TRUE(results[0].IsNotFound());
ASSERT_TRUE(results[1].IsNotFound());
ASSERT_TRUE(results[2].IsNotFound());
// should not commit since txn2 wrote a key txn has read
Status s = txn1->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn1;
delete txn2;
txn1 = txn_db->BeginTransaction(write_options, txn_options);
read_options1.snapshot = txn1->GetSnapshot();
txn2 = txn_db->BeginTransaction(write_options, txn_options);
read_options2.snapshot = txn2->GetSnapshot();
ASSERT_OK(txn1->Put("4", "x"));
ASSERT_OK(txn2->Delete("4"));
// txn1 can commit since txn2's delete hasn't happened yet (it's just batched)
ASSERT_OK(txn1->Commit());
s = txn2->GetForUpdate(read_options2, "4", &value);
ASSERT_TRUE(s.IsNotFound());
// txn2 cannot commit since txn1 changed "4"
s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn1;
delete txn2;
}
TEST_P(OptimisticTransactionTest, LostUpdate) {
WriteOptions write_options;
ReadOptions read_options, read_options1, read_options2;
OptimisticTransactionOptions txn_options;
string value;
// Test 2 transactions writing to the same key in multiple orders and
// with/without snapshots
Transaction* txn1 = txn_db->BeginTransaction(write_options);
Transaction* txn2 = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn1->Put("1", "1"));
ASSERT_OK(txn2->Put("1", "2"));
ASSERT_OK(txn1->Commit());
Status s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn1;
delete txn2;
txn_options.set_snapshot = true;
txn1 = txn_db->BeginTransaction(write_options, txn_options);
read_options1.snapshot = txn1->GetSnapshot();
txn2 = txn_db->BeginTransaction(write_options, txn_options);
read_options2.snapshot = txn2->GetSnapshot();
ASSERT_OK(txn1->Put("1", "3"));
ASSERT_OK(txn2->Put("1", "4"));
ASSERT_OK(txn1->Commit());
s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn1;
delete txn2;
txn1 = txn_db->BeginTransaction(write_options, txn_options);
read_options1.snapshot = txn1->GetSnapshot();
txn2 = txn_db->BeginTransaction(write_options, txn_options);
read_options2.snapshot = txn2->GetSnapshot();
ASSERT_OK(txn1->Put("1", "5"));
ASSERT_OK(txn1->Commit());
ASSERT_OK(txn2->Put("1", "6"));
s = txn2->Commit();
ASSERT_TRUE(s.IsBusy());
delete txn1;
delete txn2;
txn1 = txn_db->BeginTransaction(write_options, txn_options);
read_options1.snapshot = txn1->GetSnapshot();
txn2 = txn_db->BeginTransaction(write_options, txn_options);
read_options2.snapshot = txn2->GetSnapshot();
ASSERT_OK(txn1->Put("1", "5"));
ASSERT_OK(txn1->Commit());
txn2->SetSnapshot();
ASSERT_OK(txn2->Put("1", "6"));
ASSERT_OK(txn2->Commit());
delete txn1;
delete txn2;
txn1 = txn_db->BeginTransaction(write_options);
txn2 = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn1->Put("1", "7"));
ASSERT_OK(txn1->Commit());
ASSERT_OK(txn2->Put("1", "8"));
ASSERT_OK(txn2->Commit());
delete txn1;
delete txn2;
ASSERT_OK(txn_db->Get(read_options, "1", &value));
ASSERT_EQ(value, "8");
}
TEST_P(OptimisticTransactionTest, UntrackedWrites) {
WriteOptions write_options;
ReadOptions read_options;
string value;
Status s;
// Verify transaction rollback works for untracked keys.
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn->PutUntracked("untracked", "0"));
ASSERT_OK(txn->Rollback());
s = txn_db->Get(read_options, "untracked", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
txn = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn->Put("tracked", "1"));
ASSERT_OK(txn->PutUntracked("untracked", "1"));
ASSERT_OK(txn->MergeUntracked("untracked", "2"));
ASSERT_OK(txn->DeleteUntracked("untracked"));
// Write to the untracked key outside of the transaction and verify
// it doesn't prevent the transaction from committing.
ASSERT_OK(txn_db->Put(write_options, "untracked", "x"));
ASSERT_OK(txn->Commit());
s = txn_db->Get(read_options, "untracked", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
txn = txn_db->BeginTransaction(write_options);
ASSERT_OK(txn->Put("tracked", "10"));
ASSERT_OK(txn->PutUntracked("untracked", "A"));
// Write to tracked key outside of the transaction and verify that the
// untracked keys are not written when the commit fails.
ASSERT_OK(txn_db->Delete(write_options, "tracked"));
s = txn->Commit();
ASSERT_TRUE(s.IsBusy());
s = txn_db->Get(read_options, "untracked", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
}
TEST_P(OptimisticTransactionTest, IteratorTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
// Write some keys to the db
ASSERT_OK(txn_db->Put(write_options, "A", "a"));
ASSERT_OK(txn_db->Put(write_options, "G", "g"));
ASSERT_OK(txn_db->Put(write_options, "F", "f"));
ASSERT_OK(txn_db->Put(write_options, "C", "c"));
ASSERT_OK(txn_db->Put(write_options, "D", "d"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_NE(txn, nullptr);
// Write some keys in a txn
ASSERT_OK(txn->Put("B", "b"));
ASSERT_OK(txn->Put("H", "h"));
ASSERT_OK(txn->Delete("D"));
ASSERT_OK(txn->Put("E", "e"));
txn->SetSnapshot();
const Snapshot* snapshot = txn->GetSnapshot();
// Write some keys to the db after the snapshot
ASSERT_OK(txn_db->Put(write_options, "BB", "xx"));
ASSERT_OK(txn_db->Put(write_options, "C", "xx"));
read_options.snapshot = snapshot;
Iterator* iter = txn->GetIterator(read_options);
ASSERT_OK(iter->status());
iter->SeekToFirst();
// Read all keys via iter and lock them all
std::string results[] = {"a", "b", "c", "e", "f", "g", "h"};
for (int i = 0; i < 7; i++) {
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(results[i], iter->value().ToString());
ASSERT_OK(txn->GetForUpdate(read_options, iter->key(), nullptr));
iter->Next();
}
ASSERT_FALSE(iter->Valid());
iter->Seek("G");
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("g", iter->value().ToString());
iter->Prev();
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("f", iter->value().ToString());
iter->Seek("D");
ASSERT_OK(iter->status());