rocksdb/utilities/transactions/optimistic_transaction_test.cc

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// Copyright (c) 2015, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#ifndef ROCKSDB_LITE
#include <string>
#include "rocksdb/db.h"
#include "rocksdb/utilities/transaction.h"
#include "rocksdb/utilities/optimistic_transaction_db.h"
#include "util/logging.h"
#include "util/testharness.h"
using std::string;
namespace rocksdb {
class OptimisticTransactionTest : public testing::Test {
public:
OptimisticTransactionDB* txn_db;
DB* db;
string dbname;
Options options;
OptimisticTransactionTest() {
options.create_if_missing = true;
options.max_write_buffer_number = 2;
dbname = test::TmpDir() + "/optimistic_transaction_testdb";
DestroyDB(dbname, options);
Status s = OptimisticTransactionDB::Open(options, dbname, &txn_db);
assert(s.ok());
db = txn_db->GetBaseDB();
}
~OptimisticTransactionTest() {
delete txn_db;
DestroyDB(dbname, options);
}
};
TEST_F(OptimisticTransactionTest, SuccessTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
Status s;
db->Put(write_options, Slice("foo"), Slice("bar"));
db->Put(write_options, Slice("foo2"), Slice("bar"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
txn->GetForUpdate(read_options, "foo", &value);
ASSERT_EQ(value, "bar");
txn->Put(Slice("foo"), Slice("bar2"));
txn->GetForUpdate(read_options, "foo", &value);
ASSERT_EQ(value, "bar2");
s = txn->Commit();
ASSERT_OK(s);
db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "bar2");
delete txn;
}
TEST_F(OptimisticTransactionTest, WriteConflictTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
Status s;
db->Put(write_options, "foo", "bar");
db->Put(write_options, "foo2", "bar");
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
txn->Put("foo", "bar2");
// This Put outside of a transaction will conflict with the previous write
s = db->Put(write_options, "foo", "barz");
ASSERT_OK(s);
s = db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "barz");
s = txn->Commit();
ASSERT_NOK(s); // Txn should not commit
// Verify that transaction did not write anything
db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "barz");
db->Get(read_options, "foo2", &value);
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_F(OptimisticTransactionTest, WriteConflictTest2) {
WriteOptions write_options;
ReadOptions read_options;
OptimisticTransactionOptions txn_options;
string value;
Status s;
db->Put(write_options, "foo", "bar");
db->Put(write_options, "foo2", "bar");
txn_options.set_snapshot = true;
Transaction* txn = txn_db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn);
// This Put outside of a transaction will conflict with a later write
s = db->Put(write_options, "foo", "barz");
ASSERT_OK(s);
txn->Put("foo", "bar2"); // Conflicts with write done after snapshot taken
s = db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "barz");
s = txn->Commit();
ASSERT_NOK(s); // Txn should not commit
// Verify that transaction did not write anything
db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "barz");
db->Get(read_options, "foo2", &value);
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_F(OptimisticTransactionTest, ReadConflictTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
Status s;
db->Put(write_options, "foo", "bar");
db->Put(write_options, "foo2", "bar");
txn_options.set_snapshot = true;
Transaction* txn = txn_db->BeginTransaction(write_options, txn_options);
ASSERT_TRUE(txn);
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
txn->GetForUpdate(snapshot_read_options, "foo", &value);
ASSERT_EQ(value, "bar");
// This Put outside of a transaction will conflict with the previous read
s = db->Put(write_options, "foo", "barz");
ASSERT_OK(s);
s = db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "barz");
s = txn->Commit();
ASSERT_NOK(s); // Txn should not commit
// Verify that transaction did not write anything
txn->GetForUpdate(read_options, "foo", &value);
ASSERT_EQ(value, "barz");
txn->GetForUpdate(read_options, "foo2", &value);
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_F(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;
Status s;
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
txn->Put("x", "y");
s = txn->Commit();
ASSERT_OK(s);
delete txn;
}
TEST_F(OptimisticTransactionTest, FlushTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
string value;
Status s;
db->Put(write_options, Slice("foo"), Slice("bar"));
db->Put(write_options, Slice("foo2"), Slice("bar"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
snapshot_read_options.snapshot = txn->GetSnapshot();
txn->GetForUpdate(snapshot_read_options, "foo", &value);
ASSERT_EQ(value, "bar");
txn->Put(Slice("foo"), Slice("bar2"));
txn->GetForUpdate(snapshot_read_options, "foo", &value);
ASSERT_EQ(value, "bar2");
// Put a random key so we have a memtable to flush
s = db->Put(write_options, "dummy", "dummy");
ASSERT_OK(s);
// force a memtable flush
FlushOptions flush_ops;
db->Flush(flush_ops);
s = txn->Commit();
// txn should commit since the flushed table is still in MemtableList History
ASSERT_OK(s);
db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "bar2");
delete txn;
}
TEST_F(OptimisticTransactionTest, FlushTest2) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
string value;
Status s;
db->Put(write_options, Slice("foo"), Slice("bar"));
db->Put(write_options, Slice("foo2"), Slice("bar"));
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
snapshot_read_options.snapshot = txn->GetSnapshot();
txn->GetForUpdate(snapshot_read_options, "foo", &value);
ASSERT_EQ(value, "bar");
txn->Put(Slice("foo"), Slice("bar2"));
txn->GetForUpdate(snapshot_read_options, "foo", &value);
ASSERT_EQ(value, "bar2");
// Put a random key so we have a MemTable to flush
s = db->Put(write_options, "dummy", "dummy");
ASSERT_OK(s);
// force a memtable flush
FlushOptions flush_ops;
db->Flush(flush_ops);
// Put a random key so we have a MemTable to flush
s = db->Put(write_options, "dummy", "dummy2");
ASSERT_OK(s);
// force a memtable flush
db->Flush(flush_ops);
s = db->Put(write_options, "dummy", "dummy3");
ASSERT_OK(s);
// 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.
db->Flush(flush_ops);
s = txn->Commit();
// txn should not commit since MemTableList History is not large enough
ASSERT_NOK(s);
db->Get(read_options, "foo", &value);
ASSERT_EQ(value, "bar");
delete txn;
}
TEST_F(OptimisticTransactionTest, NoSnapshotTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
Status s;
db->Put(write_options, "AAA", "bar");
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
// Modify key after transaction start
db->Put(write_options, "AAA", "bar1");
// Read and write without a snapshot
txn->GetForUpdate(read_options, "AAA", &value);
ASSERT_EQ(value, "bar1");
txn->Put("AAA", "bar2");
// Should commit since read/write was done after data changed
s = txn->Commit();
ASSERT_OK(s);
txn->GetForUpdate(read_options, "AAA", &value);
ASSERT_EQ(value, "bar2");
delete txn;
}
TEST_F(OptimisticTransactionTest, MultipleSnapshotTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
string value;
Status s;
db->Put(write_options, "AAA", "bar");
db->Put(write_options, "BBB", "bar");
db->Put(write_options, "CCC", "bar");
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
db->Put(write_options, "AAA", "bar1");
// Read and write without a snapshot
txn->GetForUpdate(read_options, "AAA", &value);
ASSERT_EQ(value, "bar1");
txn->Put("AAA", "bar2");
// Modify BBB before snapshot is taken
db->Put(write_options, "BBB", "bar1");
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
// Read and write with snapshot
txn->GetForUpdate(snapshot_read_options, "BBB", &value);
ASSERT_EQ(value, "bar1");
txn->Put("BBB", "bar2");
db->Put(write_options, "CCC", "bar1");
// Set a new snapshot
txn->SetSnapshot();
snapshot_read_options.snapshot = txn->GetSnapshot();
// Read and write with snapshot
txn->GetForUpdate(snapshot_read_options, "CCC", &value);
ASSERT_EQ(value, "bar1");
txn->Put("CCC", "bar2");
s = txn->GetForUpdate(read_options, "AAA", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar2");
s = txn->GetForUpdate(read_options, "BBB", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar2");
s = txn->GetForUpdate(read_options, "CCC", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar2");
s = db->Get(read_options, "AAA", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar1");
s = db->Get(read_options, "BBB", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar1");
s = db->Get(read_options, "CCC", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar1");
s = txn->Commit();
ASSERT_OK(s);
s = db->Get(read_options, "AAA", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar2");
s = db->Get(read_options, "BBB", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "bar2");
s = db->Get(read_options, "CCC", &value);
ASSERT_OK(s);
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
db->Put(write_options, "ZZZ", "zzz");
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).
txn->Put("ZZZ", "zzzz");
s = txn->Commit();
ASSERT_OK(s);
delete txn;
// This will conflict since the snapshot is earlier than another write to ZZZ
txn2->Put("ZZZ", "xxxxx");
s = txn2->Commit();
ASSERT_NOK(s);
delete txn2;
}
TEST_F(OptimisticTransactionTest, ColumnFamiliesTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
Status s;
ColumnFamilyHandle *cfa, *cfb;
ColumnFamilyOptions cf_options;
// Create 2 new column families
s = db->CreateColumnFamily(cf_options, "CFA", &cfa);
ASSERT_OK(s);
s = db->CreateColumnFamily(cf_options, "CFB", &cfb);
ASSERT_OK(s);
delete cfa;
delete cfb;
delete txn_db;
// 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;
s = OptimisticTransactionDB::Open(options, dbname, column_families, &handles,
&txn_db);
ASSERT_OK(s);
db = txn_db->GetBaseDB();
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
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;
batch.Put("foo", "foo");
batch.Put(handles[1], "AAA", "bar");
batch.Put(handles[1], "AAAZZZ", "bar");
s = db->Write(write_options, &batch);
ASSERT_OK(s);
db->Delete(write_options, handles[1], "AAAZZZ");
// These keys do no conflict with existing writes since they're in
// different column families
txn->Delete("AAA");
txn->GetForUpdate(snapshot_read_options, handles[1], "foo", &value);
Slice key_slice("AAAZZZ");
Slice value_slices[2] = {Slice("bar"), Slice("bar")};
txn->Put(handles[2], SliceParts(&key_slice, 1), SliceParts(value_slices, 2));
// Txn should commit
s = txn->Commit();
ASSERT_OK(s);
s = db->Get(read_options, "AAA", &value);
ASSERT_TRUE(s.IsNotFound());
s = 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
txn2->Put(handles[1], SliceParts(key_slices, 3), SliceParts(&value_slice, 1));
txn2->Delete(handles[2], "XXX");
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_NOK(s);
s = db->Get(read_options, handles[1], "AAAZZZ", &value);
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_TRUE(txn);
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");
txn->Delete(handles[2], "ZZZ");
txn->Put(handles[2], "ZZZ", "YYY");
txn->Put(handles[2], "ZZZ", "YYYY");
txn->Delete(handles[2], "ZZZ");
txn->Put(handles[2], "AAAZZZ", "barbarbar");
// Txn should commit
s = txn->Commit();
ASSERT_OK(s);
s = 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
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_NOK(s);
s = db->DropColumnFamily(handles[1]);
ASSERT_OK(s);
s = db->DropColumnFamily(handles[2]);
ASSERT_OK(s);
delete txn;
delete txn2;
for (auto handle : handles) {
delete handle;
}
}
TEST_F(OptimisticTransactionTest, EmptyTest) {
WriteOptions write_options;
ReadOptions read_options;
string value;
Status s;
s = db->Put(write_options, "aaa", "aaa");
ASSERT_OK(s);
Transaction* txn = txn_db->BeginTransaction(write_options);
s = txn->Commit();
ASSERT_OK(s);
delete txn;
txn = txn_db->BeginTransaction(write_options);
txn->Rollback();
delete txn;
txn = txn_db->BeginTransaction(write_options);
s = txn->GetForUpdate(read_options, "aaa", &value);
ASSERT_EQ(value, "aaa");
s = txn->Commit();
ASSERT_OK(s);
delete txn;
txn = txn_db->BeginTransaction(write_options);
txn->SetSnapshot();
s = txn->GetForUpdate(read_options, "aaa", &value);
ASSERT_EQ(value, "aaa");
s = db->Put(write_options, "aaa", "xxx");
s = txn->Commit();
ASSERT_NOK(s);
delete txn;
}
TEST_F(OptimisticTransactionTest, PredicateManyPreceders) {
WriteOptions write_options;
ReadOptions read_options1, read_options2;
OptimisticTransactionOptions txn_options;
string value;
Status s;
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[1].IsNotFound());
txn2->Put("2", "x");
s = txn2->Commit();
ASSERT_OK(s);
multiget_values.clear();
results =
txn1->MultiGetForUpdate(read_options1, multiget_keys, &multiget_values);
ASSERT_TRUE(results[1].IsNotFound());
// should not commit since txn2 wrote a key txn has read
s = txn1->Commit();
ASSERT_NOK(s);
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();
txn1->Put("4", "x");
txn2->Delete("4");
// txn1 can commit since txn2's delete hasn't happened yet (it's just batched)
s = txn1->Commit();
ASSERT_OK(s);
s = txn2->GetForUpdate(read_options2, "4", &value);
ASSERT_TRUE(s.IsNotFound());
// txn2 cannot commit since txn1 changed "4"
s = txn2->Commit();
ASSERT_NOK(s);
delete txn1;
delete txn2;
}
TEST_F(OptimisticTransactionTest, LostUpdate) {
WriteOptions write_options;
ReadOptions read_options, read_options1, read_options2;
OptimisticTransactionOptions txn_options;
string value;
Status s;
// 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);
txn1->Put("1", "1");
txn2->Put("1", "2");
s = txn1->Commit();
ASSERT_OK(s);
s = txn2->Commit();
ASSERT_NOK(s);
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();
txn1->Put("1", "3");
txn2->Put("1", "4");
s = txn1->Commit();
ASSERT_OK(s);
s = txn2->Commit();
ASSERT_NOK(s);
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();
txn1->Put("1", "5");
s = txn1->Commit();
ASSERT_OK(s);
txn2->Put("1", "6");
s = txn2->Commit();
ASSERT_NOK(s);
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();
txn1->Put("1", "5");
s = txn1->Commit();
ASSERT_OK(s);
txn2->SetSnapshot();
txn2->Put("1", "6");
s = txn2->Commit();
ASSERT_OK(s);
delete txn1;
delete txn2;
txn1 = txn_db->BeginTransaction(write_options);
txn2 = txn_db->BeginTransaction(write_options);
txn1->Put("1", "7");
s = txn1->Commit();
ASSERT_OK(s);
txn2->Put("1", "8");
s = txn2->Commit();
ASSERT_OK(s);
delete txn1;
delete txn2;
s = db->Get(read_options, "1", &value);
ASSERT_OK(s);
ASSERT_EQ(value, "8");
}
TEST_F(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);
txn->PutUntracked("untracked", "0");
txn->Rollback();
s = db->Get(read_options, "untracked", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
txn = txn_db->BeginTransaction(write_options);
txn->Put("tracked", "1");
txn->PutUntracked("untracked", "1");
txn->MergeUntracked("untracked", "2");
txn->DeleteUntracked("untracked");
// Write to the untracked key outside of the transaction and verify
// it doesn't prevent the transaction from committing.
s = db->Put(write_options, "untracked", "x");
ASSERT_OK(s);
s = txn->Commit();
ASSERT_OK(s);
s = db->Get(read_options, "untracked", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
txn = txn_db->BeginTransaction(write_options);
txn->Put("tracked", "10");
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.
s = db->Delete(write_options, "tracked");
s = txn->Commit();
ASSERT_NOK(s);
s = db->Get(read_options, "untracked", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
}
TEST_F(OptimisticTransactionTest, IteratorTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
Status s;
// Write some keys to the db
s = db->Put(write_options, "A", "a");
ASSERT_OK(s);
s = db->Put(write_options, "G", "g");
ASSERT_OK(s);
s = db->Put(write_options, "F", "f");
ASSERT_OK(s);
s = db->Put(write_options, "C", "c");
ASSERT_OK(s);
s = db->Put(write_options, "D", "d");
ASSERT_OK(s);
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
// Write some keys in a txn
s = txn->Put("B", "b");
ASSERT_OK(s);
s = txn->Put("H", "h");
ASSERT_OK(s);
s = txn->Delete("D");
ASSERT_OK(s);
s = txn->Put("E", "e");
ASSERT_OK(s);
txn->SetSnapshot();
const Snapshot* snapshot = txn->GetSnapshot();
// Write some keys to the db after the snapshot
s = db->Put(write_options, "BB", "xx");
ASSERT_OK(s);
s = db->Put(write_options, "C", "xx");
ASSERT_OK(s);
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());
s = txn->GetForUpdate(read_options, iter->key(), nullptr);
ASSERT_OK(s);
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());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("e", iter->value().ToString());
iter->Seek("C");
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("c", iter->value().ToString());
iter->Next();
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("e", iter->value().ToString());
iter->Seek("");
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("a", iter->value().ToString());
iter->Seek("X");
ASSERT_OK(iter->status());
ASSERT_FALSE(iter->Valid());
iter->SeekToLast();
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("h", iter->value().ToString());
// key "C" was modified in the db after txn's snapshot. txn will not commit.
s = txn->Commit();
ASSERT_TRUE(s.IsBusy());
delete iter;
delete txn;
}
TEST_F(OptimisticTransactionTest, SavepointTest) {
WriteOptions write_options;
ReadOptions read_options, snapshot_read_options;
OptimisticTransactionOptions txn_options;
string value;
Status s;
Transaction* txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
txn->RollbackToSavePoint();
txn->SetSavePoint(); // 1
txn->RollbackToSavePoint(); // Rollback to beginning of txn
txn->RollbackToSavePoint();
s = txn->Put("B", "b");
ASSERT_OK(s);
s = txn->Commit();
ASSERT_OK(s);
s = db->Get(read_options, "B", &value);
ASSERT_OK(s);
ASSERT_EQ("b", value);
delete txn;
txn = txn_db->BeginTransaction(write_options);
ASSERT_TRUE(txn);
s = txn->Put("A", "a");
ASSERT_OK(s);
s = txn->Put("B", "bb");
ASSERT_OK(s);
s = txn->Put("C", "c");
ASSERT_OK(s);
txn->SetSavePoint(); // 2
s = txn->Delete("B");
ASSERT_OK(s);
s = txn->Put("C", "cc");
ASSERT_OK(s);
s = txn->Put("D", "d");
ASSERT_OK(s);
txn->RollbackToSavePoint(); // Rollback to 2
s = txn->Get(read_options, "A", &value);
ASSERT_OK(s);
ASSERT_EQ("a", value);
s = txn->Get(read_options, "B", &value);
ASSERT_OK(s);
ASSERT_EQ("bb", value);
s = txn->Get(read_options, "C", &value);
ASSERT_OK(s);
ASSERT_EQ("c", value);
s = txn->Get(read_options, "D", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Put("A", "a");
ASSERT_OK(s);
s = txn->Put("E", "e");
ASSERT_OK(s);
txn->RollbackToSavePoint(); // Rollback to beginning of txn
s = txn->Get(read_options, "A", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Get(read_options, "B", &value);
ASSERT_OK(s);
ASSERT_EQ("b", value);
s = txn->Get(read_options, "D", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Get(read_options, "D", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Get(read_options, "E", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Put("A", "aa");
ASSERT_OK(s);
s = txn->Put("F", "f");
ASSERT_OK(s);
txn->SetSavePoint(); // 3
txn->SetSavePoint(); // 4
s = txn->Put("G", "g");
ASSERT_OK(s);
s = txn->Delete("F");
ASSERT_OK(s);
s = txn->Delete("B");
ASSERT_OK(s);
s = txn->Get(read_options, "A", &value);
ASSERT_OK(s);
ASSERT_EQ("aa", value);
s = txn->Get(read_options, "F", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Get(read_options, "B", &value);
ASSERT_TRUE(s.IsNotFound());
txn->RollbackToSavePoint(); // Rollback to 3
s = txn->Get(read_options, "F", &value);
ASSERT_OK(s);
ASSERT_EQ("f", value);
s = txn->Get(read_options, "G", &value);
ASSERT_TRUE(s.IsNotFound());
s = txn->Commit();
ASSERT_OK(s);
s = db->Get(read_options, "F", &value);
ASSERT_OK(s);
ASSERT_EQ("f", value);
s = db->Get(read_options, "G", &value);
ASSERT_TRUE(s.IsNotFound());
s = db->Get(read_options, "A", &value);
ASSERT_OK(s);
ASSERT_EQ("aa", value);
s = db->Get(read_options, "B", &value);
ASSERT_OK(s);
ASSERT_EQ("b", value);
s = db->Get(read_options, "C", &value);
ASSERT_TRUE(s.IsNotFound());
s = db->Get(read_options, "D", &value);
ASSERT_TRUE(s.IsNotFound());
s = db->Get(read_options, "E", &value);
ASSERT_TRUE(s.IsNotFound());
delete txn;
}
} // 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 optimistic_transaction is not supported in ROCKSDB_LITE\n");
return 0;
}
#endif // !ROCKSDB_LITE