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MultiGet() with timestamp should respect snapshot (#7404)

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Summary:
Similar to PR https://github.com/facebook/rocksdb/issues/7227, add read callback to filter out rows with with
higher sequence number.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7404

Reviewed By: riversand963

Differential Revision: D23790762

Pulled By: jay-zhuang

fbshipit-source-id: bce854307612f1a22f985ffc934da627d0a139c2
This commit is contained in:
Jay Zhuang 2020-09-25 09:40:51 -07:00 committed by Facebook GitHub Bot
parent c5b3128f15
commit 8c9fff917c
2 changed files with 310 additions and 10 deletions
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47
db/db_impl/db_impl.cc
View file

@ -1815,6 +1815,9 @@ std::vector<Status> DBImpl::MultiGet(
read_options, nullptr, iter_deref_lambda, &multiget_cf_data,
&consistent_seqnum);
TEST_SYNC_POINT("DBImpl::MultiGet:AfterGetSeqNum1");
TEST_SYNC_POINT("DBImpl::MultiGet:AfterGetSeqNum2");
// Contain a list of merge operations if merge occurs.
MergeContext merge_context;
@ -1837,6 +1840,14 @@ std::vector<Status> DBImpl::MultiGet(
size_t num_found = 0;
size_t keys_read;
uint64_t curr_value_size = 0;
GetWithTimestampReadCallback timestamp_read_callback(0);
ReadCallback* read_callback = nullptr;
if (read_options.timestamp && read_options.timestamp->size() > 0) {
timestamp_read_callback.Refresh(consistent_seqnum);
read_callback = &timestamp_read_callback;
}
for (keys_read = 0; keys_read < num_keys; ++keys_read) {
merge_context.Clear();
Status& s = stat_list[keys_read];
@ -1857,12 +1868,14 @@ std::vector<Status> DBImpl::MultiGet(
bool done = false;
if (!skip_memtable) {
if (super_version->mem->Get(lkey, value, timestamp, &s, &merge_context,
&max_covering_tombstone_seq, read_options)) {
&max_covering_tombstone_seq, read_options,
read_callback)) {
done = true;
RecordTick(stats_, MEMTABLE_HIT);
} else if (super_version->imm->Get(
lkey, value, timestamp, &s, &merge_context,
&max_covering_tombstone_seq, read_options)) {
} else if (super_version->imm->Get(lkey, value, timestamp, &s,
&merge_context,
&max_covering_tombstone_seq,
read_options, read_callback)) {
done = true;
RecordTick(stats_, MEMTABLE_HIT);
}
@ -1870,9 +1883,11 @@ std::vector<Status> DBImpl::MultiGet(
if (!done) {
PinnableSlice pinnable_val;
PERF_TIMER_GUARD(get_from_output_files_time);
super_version->current->Get(read_options, lkey, &pinnable_val, timestamp,
&s, &merge_context,
&max_covering_tombstone_seq);
super_version->current->Get(
read_options, lkey, &pinnable_val, timestamp, &s, &merge_context,
&max_covering_tombstone_seq, /*value_found=*/nullptr,
/*key_exists=*/nullptr,
/*seq=*/nullptr, read_callback);
value->assign(pinnable_val.data(), pinnable_val.size());
RecordTick(stats_, MEMTABLE_MISS);
}
@ -2130,12 +2145,19 @@ void DBImpl::MultiGet(const ReadOptions& read_options, const size_t num_keys,
read_options, nullptr, iter_deref_lambda, &multiget_cf_data,
&consistent_seqnum);
GetWithTimestampReadCallback timestamp_read_callback(0);
ReadCallback* read_callback = nullptr;
if (read_options.timestamp && read_options.timestamp->size() > 0) {
timestamp_read_callback.Refresh(consistent_seqnum);
read_callback = &timestamp_read_callback;
}
Status s;
auto cf_iter = multiget_cf_data.begin();
for (; cf_iter != multiget_cf_data.end(); ++cf_iter) {
s = MultiGetImpl(read_options, cf_iter->start, cf_iter->num_keys,
&sorted_keys, cf_iter->super_version, consistent_seqnum,
nullptr, nullptr);
read_callback, nullptr);
if (!s.ok()) {
break;
}
@ -2298,9 +2320,16 @@ void DBImpl::MultiGetWithCallback(
consistent_seqnum = callback->max_visible_seq();
}
GetWithTimestampReadCallback timestamp_read_callback(0);
ReadCallback* read_callback = nullptr;
if (read_options.timestamp && read_options.timestamp->size() > 0) {
timestamp_read_callback.Refresh(consistent_seqnum);
read_callback = &timestamp_read_callback;
}
Status s = MultiGetImpl(read_options, 0, num_keys, sorted_keys,
multiget_cf_data[0].super_version, consistent_seqnum,
nullptr, nullptr);
read_callback, nullptr);
assert(s.ok() || s.IsTimedOut() || s.IsAborted());
ReturnAndCleanupSuperVersion(multiget_cf_data[0].cfd,
multiget_cf_data[0].super_version);

273
db/db_with_timestamp_basic_test.cc
View file

@ -590,8 +590,132 @@ TEST_F(DBBasicTestWithTimestamp, CompactDeletionWithTimestampMarkerToBottom) {
class DataVisibilityTest : public DBBasicTestWithTimestampBase {
public:
DataVisibilityTest() : DBBasicTestWithTimestampBase("data_visibility_test") {}
DataVisibilityTest() : DBBasicTestWithTimestampBase("data_visibility_test") {
// Initialize test data
for (int i = 0; i < kTestDataSize; i++) {
test_data_[i].key = "key" + ToString(i);
test_data_[i].value = "value" + ToString(i);
test_data_[i].timestamp = Timestamp(i, 0);
test_data_[i].ts = i;
test_data_[i].seq_num = kMaxSequenceNumber;
}
}
protected:
struct TestData {
std::string key;
std::string value;
int ts;
std::string timestamp;
SequenceNumber seq_num;
};
constexpr static int kTestDataSize = 3;
TestData test_data_[kTestDataSize];
void PutTestData(int index, ColumnFamilyHandle* cfh = nullptr) {
ASSERT_LE(index, kTestDataSize);
WriteOptions write_opts;
Slice ts_slice = test_data_[index].timestamp;
write_opts.timestamp = &ts_slice;
if (cfh == nullptr) {
ASSERT_OK(
db_->Put(write_opts, test_data_[index].key, test_data_[index].value));
const Snapshot* snap = db_->GetSnapshot();
test_data_[index].seq_num = snap->GetSequenceNumber();
if (index > 0) {
ASSERT_GT(test_data_[index].seq_num, test_data_[index - 1].seq_num);
}
db_->ReleaseSnapshot(snap);
} else {
ASSERT_OK(db_->Put(write_opts, cfh, test_data_[index].key,
test_data_[index].value));
}
}
void AssertVisibility(int ts, SequenceNumber seq,
std::vector<Status> statuses) {
ASSERT_EQ(kTestDataSize, statuses.size());
for (int i = 0; i < kTestDataSize; i++) {
if (test_data_[i].seq_num <= seq && test_data_[i].ts <= ts) {
ASSERT_OK(statuses[i]);
} else {
ASSERT_TRUE(statuses[i].IsNotFound());
}
}
}
std::vector<Slice> GetKeys() {
std::vector<Slice> ret(kTestDataSize);
for (int i = 0; i < kTestDataSize; i++) {
ret[i] = test_data_[i].key;
}
return ret;
}
void VerifyDefaultCF(int ts, const Snapshot* snap = nullptr) {
ReadOptions read_opts;
std::string read_ts = Timestamp(ts, 0);
Slice read_ts_slice = read_ts;
read_opts.timestamp = &read_ts_slice;
read_opts.snapshot = snap;
ColumnFamilyHandle* cfh = db_->DefaultColumnFamily();
std::vector<ColumnFamilyHandle*> cfs(kTestDataSize, cfh);
SequenceNumber seq =
snap ? snap->GetSequenceNumber() : kMaxSequenceNumber - 1;
// There're several MultiGet interfaces with not exactly the same
// implementations, query data with all of them.
auto keys = GetKeys();
std::vector<std::string> values;
auto s1 = db_->MultiGet(read_opts, cfs, keys, &values);
AssertVisibility(ts, seq, s1);
auto s2 = db_->MultiGet(read_opts, keys, &values);
AssertVisibility(ts, seq, s2);
std::vector<std::string> timestamps;
auto s3 = db_->MultiGet(read_opts, cfs, keys, &values, &timestamps);
AssertVisibility(ts, seq, s3);
auto s4 = db_->MultiGet(read_opts, keys, &values, &timestamps);
AssertVisibility(ts, seq, s4);
std::vector<PinnableSlice> values_ps5(kTestDataSize);
std::vector<Status> s5(kTestDataSize);
db_->MultiGet(read_opts, cfh, kTestDataSize, keys.data(), values_ps5.data(),
s5.data());
AssertVisibility(ts, seq, s5);
std::vector<PinnableSlice> values_ps6(kTestDataSize);
std::vector<Status> s6(kTestDataSize);
std::vector<std::string> timestamps_array(kTestDataSize);
db_->MultiGet(read_opts, cfh, kTestDataSize, keys.data(), values_ps6.data(),
timestamps_array.data(), s6.data());
AssertVisibility(ts, seq, s6);
std::vector<PinnableSlice> values_ps7(kTestDataSize);
std::vector<Status> s7(kTestDataSize);
db_->MultiGet(read_opts, kTestDataSize, cfs.data(), keys.data(),
values_ps7.data(), s7.data());
AssertVisibility(ts, seq, s7);
std::vector<PinnableSlice> values_ps8(kTestDataSize);
std::vector<Status> s8(kTestDataSize);
db_->MultiGet(read_opts, kTestDataSize, cfs.data(), keys.data(),
values_ps8.data(), timestamps_array.data(), s8.data());
AssertVisibility(ts, seq, s8);
}
void VerifyDefaultCF(const Snapshot* snap = nullptr) {
for (int i = 0; i <= kTestDataSize; i++) {
VerifyDefaultCF(i, snap);
}
}
};
constexpr int DataVisibilityTest::kTestDataSize;
// Application specifies timestamp but not snapshot.
// reader writer
@ -906,6 +1030,153 @@ TEST_F(DataVisibilityTest, RangeScanWithSnapshot) {
Close();
}
// Application specifies both timestamp and snapshot.
// Query each combination and make sure for MultiGet key <k, t1, s1>, only
// return keys that ts>=t1 AND seq>=s1.
TEST_F(DataVisibilityTest, MultiGetWithTimestamp) {
Options options = CurrentOptions();
const size_t kTimestampSize = Timestamp(0, 0).size();
TestComparator test_cmp(kTimestampSize);
options.comparator = &test_cmp;
DestroyAndReopen(options);
const Snapshot* snap0 = db_->GetSnapshot();
PutTestData(0);
VerifyDefaultCF();
VerifyDefaultCF(snap0);
const Snapshot* snap1 = db_->GetSnapshot();
PutTestData(1);
VerifyDefaultCF();
VerifyDefaultCF(snap0);
VerifyDefaultCF(snap1);
Flush();
const Snapshot* snap2 = db_->GetSnapshot();
PutTestData(2);
VerifyDefaultCF();
VerifyDefaultCF(snap0);
VerifyDefaultCF(snap1);
VerifyDefaultCF(snap2);
db_->ReleaseSnapshot(snap0);
db_->ReleaseSnapshot(snap1);
db_->ReleaseSnapshot(snap2);
Close();
}
// Application specifies timestamp but not snapshot.
// reader writer
// ts'=0, 1
// ts=3
// seq=10
// seq'=11, 12
// write finishes
// MultiGet(ts,seq)
// For MultiGet <k, t1, s1>, only return keys that ts>=t1 AND seq>=s1.
TEST_F(DataVisibilityTest, MultiGetWithoutSnapshot) {
Options options = CurrentOptions();
const size_t kTimestampSize = Timestamp(0, 0).size();
TestComparator test_cmp(kTimestampSize);
options.comparator = &test_cmp;
DestroyAndReopen(options);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->LoadDependency({
{"DBImpl::MultiGet:AfterGetSeqNum1",
"DataVisibilityTest::MultiGetWithoutSnapshot:BeforePut"},
{"DataVisibilityTest::MultiGetWithoutSnapshot:AfterPut",
"DBImpl::MultiGet:AfterGetSeqNum2"},
});
SyncPoint::GetInstance()->EnableProcessing();
port::Thread writer_thread([this]() {
TEST_SYNC_POINT("DataVisibilityTest::MultiGetWithoutSnapshot:BeforePut");
PutTestData(0);
PutTestData(1);
TEST_SYNC_POINT("DataVisibilityTest::MultiGetWithoutSnapshot:AfterPut");
});
ReadOptions read_opts;
std::string read_ts = Timestamp(kTestDataSize, 0);
Slice read_ts_slice = read_ts;
read_opts.timestamp = &read_ts_slice;
auto keys = GetKeys();
std::vector<std::string> values;
auto ss = db_->MultiGet(read_opts, keys, &values);
writer_thread.join();
for (auto s : ss) {
ASSERT_TRUE(s.IsNotFound());
}
VerifyDefaultCF();
Close();
}
TEST_F(DataVisibilityTest, MultiGetCrossCF) {
Options options = CurrentOptions();
const size_t kTimestampSize = Timestamp(0, 0).size();
TestComparator test_cmp(kTimestampSize);
options.comparator = &test_cmp;
DestroyAndReopen(options);
CreateAndReopenWithCF({"second"}, options);
ColumnFamilyHandle* second_cf = handles_[1];
const Snapshot* snap0 = db_->GetSnapshot();
PutTestData(0);
PutTestData(0, second_cf);
VerifyDefaultCF();
VerifyDefaultCF(snap0);
const Snapshot* snap1 = db_->GetSnapshot();
PutTestData(1);
PutTestData(1, second_cf);
VerifyDefaultCF();
VerifyDefaultCF(snap0);
VerifyDefaultCF(snap1);
Flush();
const Snapshot* snap2 = db_->GetSnapshot();
PutTestData(2);
PutTestData(2, second_cf);
VerifyDefaultCF();
VerifyDefaultCF(snap0);
VerifyDefaultCF(snap1);
VerifyDefaultCF(snap2);
ReadOptions read_opts;
std::string read_ts = Timestamp(kTestDataSize, 0);
Slice read_ts_slice = read_ts;
read_opts.timestamp = &read_ts_slice;
read_opts.snapshot = snap1;
auto keys = GetKeys();
auto keys2 = GetKeys();
keys.insert(keys.end(), keys2.begin(), keys2.end());
std::vector<ColumnFamilyHandle*> cfs(kTestDataSize,
db_->DefaultColumnFamily());
std::vector<ColumnFamilyHandle*> cfs2(kTestDataSize, second_cf);
cfs.insert(cfs.end(), cfs2.begin(), cfs2.end());
std::vector<std::string> values;
auto ss = db_->MultiGet(read_opts, cfs, keys, &values);
for (int i = 0; i < 2 * kTestDataSize; i++) {
if (i % 3 == 0) {
// only the first key for each column family should be returned
ASSERT_OK(ss[i]);
} else {
ASSERT_TRUE(ss[i].IsNotFound());
}
}
db_->ReleaseSnapshot(snap0);
db_->ReleaseSnapshot(snap1);
db_->ReleaseSnapshot(snap2);
Close();
}
class DBBasicTestWithTimestampCompressionSettings
: public DBBasicTestWithTimestampBase,
public testing::WithParamInterface<