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rocksdb/db/compaction/compaction_iterator_test.cc
Levi Tamasi dc5de45af8 Support readahead during compaction for blob files (#9187) 
Summary:
The patch adds a new BlobDB configuration option `blob_compaction_readahead_size`
that can be used to enable prefetching data from blob files during compaction.
This is important when using storage with higher latencies like HDDs or remote filesystems.
If enabled, prefetching is used for all cases when blobs are read during compaction,
namely garbage collection, compaction filters (when the existing value has to be read from
a blob file), and `Merge` (when the value of the base `Put` is stored in a blob file).

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9187

Test Plan: Ran `make check` and the stress/crash test.

Reviewed By: riversand963

Differential Revision: D32565512

Pulled By: ltamasi

fbshipit-source-id: 87be9cebc3aa01cc227bec6b5f64d827b8164f5d
2021-11-19 17:53:47 -08:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/compaction/compaction_iterator.h"
#include <string>
#include <vector>
#include "db/dbformat.h"
#include "port/port.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "util/string_util.h"
#include "util/vector_iterator.h"
#include "utilities/merge_operators.h"
namespace ROCKSDB_NAMESPACE {
// Expects no merging attempts.
class NoMergingMergeOp : public MergeOperator {
public:
bool FullMergeV2(const MergeOperationInput& /*merge_in*/,
MergeOperationOutput* /*merge_out*/) const override {
ADD_FAILURE();
return false;
}
bool PartialMergeMulti(const Slice& /*key*/,
const std::deque<Slice>& /*operand_list*/,
std::string* /*new_value*/,
Logger* /*logger*/) const override {
ADD_FAILURE();
return false;
}
const char* Name() const override {
return "CompactionIteratorTest NoMergingMergeOp";
}
};
// Compaction filter that gets stuck when it sees a particular key,
// then gets unstuck when told to.
// Always returns Decision::kRemove.
class StallingFilter : public CompactionFilter {
public:
Decision FilterV2(int /*level*/, const Slice& key, ValueType /*type*/,
const Slice& /*existing_value*/, std::string* /*new_value*/,
std::string* /*skip_until*/) const override {
int k = std::atoi(key.ToString().c_str());
last_seen.store(k);
while (k >= stall_at.load()) {
std::this_thread::yield();
}
return Decision::kRemove;
}
const char* Name() const override {
return "CompactionIteratorTest StallingFilter";
}
// Wait until the filter sees a key >= k and stalls at that key.
// If `exact`, asserts that the seen key is equal to k.
void WaitForStall(int k, bool exact = true) {
stall_at.store(k);
while (last_seen.load() < k) {
std::this_thread::yield();
}
if (exact) {
EXPECT_EQ(k, last_seen.load());
}
}
// Filter will stall on key >= stall_at. Advance stall_at to unstall.
mutable std::atomic<int> stall_at{0};
// Last key the filter was called with.
mutable std::atomic<int> last_seen{0};
};
// Compaction filter that filter out all keys.
class FilterAllKeysCompactionFilter : public CompactionFilter {
public:
Decision FilterV2(int /*level*/, const Slice& /*key*/, ValueType /*type*/,
const Slice& /*existing_value*/, std::string* /*new_value*/,
std::string* /*skip_until*/) const override {
return Decision::kRemove;
}
const char* Name() const override { return "AllKeysCompactionFilter"; }
};
class LoggingForwardVectorIterator : public VectorIterator {
public:
struct Action {
enum class Type {
SEEK_TO_FIRST,
SEEK,
NEXT,
};
Type type;
std::string arg;
explicit Action(Type _type, std::string _arg = "")
: type(_type), arg(_arg) {}
bool operator==(const Action& rhs) const {
return std::tie(type, arg) == std::tie(rhs.type, rhs.arg);
}
};
LoggingForwardVectorIterator(const std::vector<std::string>& keys,
const std::vector<std::string>& values)
: VectorIterator(keys, values) {
current_ = keys_.size();
}
void SeekToFirst() override {
log.emplace_back(Action::Type::SEEK_TO_FIRST);
VectorIterator::SeekToFirst();
}
void SeekToLast() override { assert(false); }
void Seek(const Slice& target) override {
log.emplace_back(Action::Type::SEEK, target.ToString());
VectorIterator::Seek(target);
}
void SeekForPrev(const Slice& /*target*/) override { assert(false); }
void Next() override {
assert(Valid());
log.emplace_back(Action::Type::NEXT);
VectorIterator::Next();
}
void Prev() override { assert(false); }
Slice key() const override {
assert(Valid());
return VectorIterator::key();
}
Slice value() const override {
assert(Valid());
return VectorIterator::value();
}
std::vector<Action> log;
};
class FakeCompaction : public CompactionIterator::CompactionProxy {
public:
int level() const override { return 0; }
bool KeyNotExistsBeyondOutputLevel(
const Slice& /*user_key*/,
std::vector<size_t>* /*level_ptrs*/) const override {
return is_bottommost_level || key_not_exists_beyond_output_level;
}
bool bottommost_level() const override { return is_bottommost_level; }
int number_levels() const override { return 1; }
Slice GetLargestUserKey() const override {
return "\xff\xff\xff\xff\xff\xff\xff\xff\xff";
}
bool allow_ingest_behind() const override { return is_allow_ingest_behind; }
bool preserve_deletes() const override { return false; }
bool allow_mmap_reads() const override { return false; }
bool enable_blob_garbage_collection() const override { return false; }
double blob_garbage_collection_age_cutoff() const override { return 0.0; }
uint64_t blob_compaction_readahead_size() const override { return 0; }
const Version* input_version() const override { return nullptr; }
bool DoesInputReferenceBlobFiles() const override { return false; }
const Compaction* real_compaction() const override { return nullptr; }
bool key_not_exists_beyond_output_level = false;
bool is_bottommost_level = false;
bool is_allow_ingest_behind = false;
};
// A simplified snapshot checker which assumes each snapshot has a global
// last visible sequence.
class TestSnapshotChecker : public SnapshotChecker {
public:
explicit TestSnapshotChecker(
SequenceNumber last_committed_sequence,
const std::unordered_map<SequenceNumber, SequenceNumber>& snapshots = {{}})
: last_committed_sequence_(last_committed_sequence),
snapshots_(snapshots) {}
SnapshotCheckerResult CheckInSnapshot(
SequenceNumber seq, SequenceNumber snapshot_seq) const override {
if (snapshot_seq == kMaxSequenceNumber) {
return seq <= last_committed_sequence_
? SnapshotCheckerResult::kInSnapshot
: SnapshotCheckerResult::kNotInSnapshot;
}
assert(snapshots_.count(snapshot_seq) > 0);
return seq <= snapshots_.at(snapshot_seq)
? SnapshotCheckerResult::kInSnapshot
: SnapshotCheckerResult::kNotInSnapshot;
}
private:
SequenceNumber last_committed_sequence_;
// A map of valid snapshot to last visible sequence to the snapshot.
std::unordered_map<SequenceNumber, SequenceNumber> snapshots_;
};
// Test param:
// bool: whether to pass snapshot_checker to compaction iterator.
class CompactionIteratorTest : public testing::TestWithParam<bool> {
public:
CompactionIteratorTest()
: cmp_(BytewiseComparator()), icmp_(cmp_), snapshots_({}) {}
explicit CompactionIteratorTest(const Comparator* ucmp)
: cmp_(ucmp), icmp_(cmp_), snapshots_({}) {}
void InitIterators(
const std::vector<std::string>& ks, const std::vector<std::string>& vs,
const std::vector<std::string>& range_del_ks,
const std::vector<std::string>& range_del_vs,
SequenceNumber last_sequence,
SequenceNumber last_committed_sequence = kMaxSequenceNumber,
MergeOperator* merge_op = nullptr, CompactionFilter* filter = nullptr,
bool bottommost_level = false,
SequenceNumber earliest_write_conflict_snapshot = kMaxSequenceNumber,
bool key_not_exists_beyond_output_level = false,
const std::string* full_history_ts_low = nullptr) {
std::unique_ptr<InternalIterator> unfragmented_range_del_iter(
new VectorIterator(range_del_ks, range_del_vs, &icmp_));
auto tombstone_list = std::make_shared<FragmentedRangeTombstoneList>(
std::move(unfragmented_range_del_iter), icmp_);
std::unique_ptr<FragmentedRangeTombstoneIterator> range_del_iter(
new FragmentedRangeTombstoneIterator(tombstone_list, icmp_,
kMaxSequenceNumber));
range_del_agg_.reset(new CompactionRangeDelAggregator(&icmp_, snapshots_));
range_del_agg_->AddTombstones(std::move(range_del_iter));
std::unique_ptr<CompactionIterator::CompactionProxy> compaction;
if (filter || bottommost_level || key_not_exists_beyond_output_level) {
compaction_proxy_ = new FakeCompaction();
compaction_proxy_->is_bottommost_level = bottommost_level;
compaction_proxy_->is_allow_ingest_behind = AllowIngestBehind();
compaction_proxy_->key_not_exists_beyond_output_level =
key_not_exists_beyond_output_level;
compaction.reset(compaction_proxy_);
}
bool use_snapshot_checker = UseSnapshotChecker() || GetParam();
if (use_snapshot_checker || last_committed_sequence < kMaxSequenceNumber) {
snapshot_checker_.reset(
new TestSnapshotChecker(last_committed_sequence, snapshot_map_));
}
merge_helper_.reset(
new MergeHelper(Env::Default(), cmp_, merge_op, filter, nullptr, false,
0 /*latest_snapshot*/, snapshot_checker_.get(),
0 /*level*/, nullptr /*statistics*/, &shutting_down_));
if (c_iter_) {
// Since iter_ is still used in ~CompactionIterator(), we call
// ~CompactionIterator() first.
c_iter_.reset();
}
iter_.reset(new LoggingForwardVectorIterator(ks, vs));
iter_->SeekToFirst();
c_iter_.reset(new CompactionIterator(
iter_.get(), cmp_, merge_helper_.get(), last_sequence, &snapshots_,
earliest_write_conflict_snapshot, snapshot_checker_.get(),
Env::Default(), false /* report_detailed_time */, false,
range_del_agg_.get(), nullptr /* blob_file_builder */,
true /*allow_data_in_errors*/, std::move(compaction), filter,
&shutting_down_, /*preserve_deletes_seqnum=*/0,
/*manual_compaction_paused=*/nullptr,
/*manual_compaction_canceled=*/nullptr, /*info_log=*/nullptr,
full_history_ts_low));
}
void AddSnapshot(SequenceNumber snapshot,
SequenceNumber last_visible_seq = kMaxSequenceNumber) {
snapshots_.push_back(snapshot);
snapshot_map_[snapshot] = last_visible_seq;
}
virtual bool UseSnapshotChecker() const { return false; }
virtual bool AllowIngestBehind() const { return false; }
void RunTest(
const std::vector<std::string>& input_keys,
const std::vector<std::string>& input_values,
const std::vector<std::string>& expected_keys,
const std::vector<std::string>& expected_values,
SequenceNumber last_committed_seq = kMaxSequenceNumber,
MergeOperator* merge_operator = nullptr,
CompactionFilter* compaction_filter = nullptr,
bool bottommost_level = false,
SequenceNumber earliest_write_conflict_snapshot = kMaxSequenceNumber,
bool key_not_exists_beyond_output_level = false,
const std::string* full_history_ts_low = nullptr) {
InitIterators(input_keys, input_values, {}, {}, kMaxSequenceNumber,
last_committed_seq, merge_operator, compaction_filter,
bottommost_level, earliest_write_conflict_snapshot,
key_not_exists_beyond_output_level, full_history_ts_low);
c_iter_->SeekToFirst();
for (size_t i = 0; i < expected_keys.size(); i++) {
std::string info = "i = " + ToString(i);
ASSERT_TRUE(c_iter_->Valid()) << info;
ASSERT_OK(c_iter_->status()) << info;
ASSERT_EQ(expected_keys[i], c_iter_->key().ToString()) << info;
ASSERT_EQ(expected_values[i], c_iter_->value().ToString()) << info;
c_iter_->Next();
}
ASSERT_OK(c_iter_->status());
ASSERT_FALSE(c_iter_->Valid());
}
void ClearSnapshots() {
snapshots_.clear();
snapshot_map_.clear();
}
const Comparator* cmp_;
const InternalKeyComparator icmp_;
std::vector<SequenceNumber> snapshots_;
// A map of valid snapshot to last visible sequence to the snapshot.
std::unordered_map<SequenceNumber, SequenceNumber> snapshot_map_;
std::unique_ptr<MergeHelper> merge_helper_;
std::unique_ptr<LoggingForwardVectorIterator> iter_;
std::unique_ptr<CompactionIterator> c_iter_;
std::unique_ptr<CompactionRangeDelAggregator> range_del_agg_;
std::unique_ptr<SnapshotChecker> snapshot_checker_;
std::atomic<bool> shutting_down_{false};
FakeCompaction* compaction_proxy_;
};
// It is possible that the output of the compaction iterator is empty even if
// the input is not.
TEST_P(CompactionIteratorTest, EmptyResult) {
InitIterators({test::KeyStr("a", 5, kTypeSingleDeletion),
test::KeyStr("a", 3, kTypeValue)},
{"", "val"}, {}, {}, 5);
c_iter_->SeekToFirst();
ASSERT_OK(c_iter_->status());
ASSERT_FALSE(c_iter_->Valid());
}
// If there is a corruption after a single deletion, the corrupted key should
// be preserved.
TEST_P(CompactionIteratorTest, CorruptionAfterSingleDeletion) {
InitIterators({test::KeyStr("a", 5, kTypeSingleDeletion),
test::KeyStr("a", 3, kTypeValue, true),
test::KeyStr("b", 10, kTypeValue)},
{"", "val", "val2"}, {}, {}, 10);
c_iter_->SeekToFirst();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("a", 5, kTypeSingleDeletion),
c_iter_->key().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("a", 3, kTypeValue, true), c_iter_->key().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("b", 10, kTypeValue), c_iter_->key().ToString());
c_iter_->Next();
ASSERT_OK(c_iter_->status());
ASSERT_FALSE(c_iter_->Valid());
}
TEST_P(CompactionIteratorTest, SimpleRangeDeletion) {
InitIterators({test::KeyStr("morning", 5, kTypeValue),
test::KeyStr("morning", 2, kTypeValue),
test::KeyStr("night", 3, kTypeValue)},
{"zao", "zao", "wan"},
{test::KeyStr("ma", 4, kTypeRangeDeletion)}, {"mz"}, 5);
c_iter_->SeekToFirst();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("morning", 5, kTypeValue), c_iter_->key().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("night", 3, kTypeValue), c_iter_->key().ToString());
c_iter_->Next();
ASSERT_OK(c_iter_->status());
ASSERT_FALSE(c_iter_->Valid());
}
TEST_P(CompactionIteratorTest, RangeDeletionWithSnapshots) {
AddSnapshot(10);
std::vector<std::string> ks1;
ks1.push_back(test::KeyStr("ma", 28, kTypeRangeDeletion));
std::vector<std::string> vs1{"mz"};
std::vector<std::string> ks2{test::KeyStr("morning", 15, kTypeValue),
test::KeyStr("morning", 5, kTypeValue),
test::KeyStr("night", 40, kTypeValue),
test::KeyStr("night", 20, kTypeValue)};
std::vector<std::string> vs2{"zao 15", "zao 5", "wan 40", "wan 20"};
InitIterators(ks2, vs2, ks1, vs1, 40);
c_iter_->SeekToFirst();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("morning", 5, kTypeValue), c_iter_->key().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("night", 40, kTypeValue), c_iter_->key().ToString());
c_iter_->Next();
ASSERT_OK(c_iter_->status());
ASSERT_FALSE(c_iter_->Valid());
}
TEST_P(CompactionIteratorTest, CompactionFilterSkipUntil) {
class Filter : public CompactionFilter {
Decision FilterV2(int /*level*/, const Slice& key, ValueType t,
const Slice& existing_value, std::string* /*new_value*/,
std::string* skip_until) const override {
std::string k = key.ToString();
std::string v = existing_value.ToString();
// See InitIterators() call below for the sequence of keys and their
// filtering decisions. Here we closely assert that compaction filter is
// called with the expected keys and only them, and with the right values.
if (k == "a") {
EXPECT_EQ(ValueType::kValue, t);
EXPECT_EQ("av50", v);
return Decision::kKeep;
}
if (k == "b") {
EXPECT_EQ(ValueType::kValue, t);
EXPECT_EQ("bv60", v);
*skip_until = "d+";
return Decision::kRemoveAndSkipUntil;
}
if (k == "e") {
EXPECT_EQ(ValueType::kMergeOperand, t);
EXPECT_EQ("em71", v);
return Decision::kKeep;
}
if (k == "f") {
if (v == "fm65") {
EXPECT_EQ(ValueType::kMergeOperand, t);
*skip_until = "f";
} else {
EXPECT_EQ("fm30", v);
EXPECT_EQ(ValueType::kMergeOperand, t);
*skip_until = "g+";
}
return Decision::kRemoveAndSkipUntil;
}
if (k == "h") {
EXPECT_EQ(ValueType::kValue, t);
EXPECT_EQ("hv91", v);
return Decision::kKeep;
}
if (k == "i") {
EXPECT_EQ(ValueType::kMergeOperand, t);
EXPECT_EQ("im95", v);
*skip_until = "z";
return Decision::kRemoveAndSkipUntil;
}
ADD_FAILURE();
return Decision::kKeep;
}
const char* Name() const override {
return "CompactionIteratorTest.CompactionFilterSkipUntil::Filter";
}
};
NoMergingMergeOp merge_op;
Filter filter;
InitIterators(
{test::KeyStr("a", 50, kTypeValue), // keep
test::KeyStr("a", 45, kTypeMerge),
test::KeyStr("b", 60, kTypeValue), // skip to "d+"
test::KeyStr("b", 40, kTypeValue), test::KeyStr("c", 35, kTypeValue),
test::KeyStr("d", 70, kTypeMerge),
test::KeyStr("e", 71, kTypeMerge), // keep
test::KeyStr("f", 65, kTypeMerge), // skip to "f", aka keep
test::KeyStr("f", 30, kTypeMerge), // skip to "g+"
test::KeyStr("f", 25, kTypeValue), test::KeyStr("g", 90, kTypeValue),
test::KeyStr("h", 91, kTypeValue), // keep
test::KeyStr("i", 95, kTypeMerge), // skip to "z"
test::KeyStr("j", 99, kTypeValue)},
{"av50", "am45", "bv60", "bv40", "cv35", "dm70", "em71", "fm65", "fm30",
"fv25", "gv90", "hv91", "im95", "jv99"},
{}, {}, kMaxSequenceNumber, kMaxSequenceNumber, &merge_op, &filter);
// Compaction should output just "a", "e" and "h" keys.
c_iter_->SeekToFirst();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("a", 50, kTypeValue), c_iter_->key().ToString());
ASSERT_EQ("av50", c_iter_->value().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("e", 71, kTypeMerge), c_iter_->key().ToString());
ASSERT_EQ("em71", c_iter_->value().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("h", 91, kTypeValue), c_iter_->key().ToString());
ASSERT_EQ("hv91", c_iter_->value().ToString());
c_iter_->Next();
ASSERT_OK(c_iter_->status());
ASSERT_FALSE(c_iter_->Valid());
// Check that the compaction iterator did the correct sequence of calls on
// the underlying iterator.
using A = LoggingForwardVectorIterator::Action;
using T = A::Type;
std::vector<A> expected_actions = {
A(T::SEEK_TO_FIRST),
A(T::NEXT),
A(T::NEXT),
A(T::SEEK, test::KeyStr("d+", kMaxSequenceNumber, kValueTypeForSeek)),
A(T::NEXT),
A(T::NEXT),
A(T::SEEK, test::KeyStr("g+", kMaxSequenceNumber, kValueTypeForSeek)),
A(T::NEXT),
A(T::SEEK, test::KeyStr("z", kMaxSequenceNumber, kValueTypeForSeek))};
ASSERT_EQ(expected_actions, iter_->log);
}
TEST_P(CompactionIteratorTest, ShuttingDownInFilter) {
NoMergingMergeOp merge_op;
StallingFilter filter;
InitIterators(
{test::KeyStr("1", 1, kTypeValue), test::KeyStr("2", 2, kTypeValue),
test::KeyStr("3", 3, kTypeValue), test::KeyStr("4", 4, kTypeValue)},
{"v1", "v2", "v3", "v4"}, {}, {}, kMaxSequenceNumber, kMaxSequenceNumber,
&merge_op, &filter);
// Don't leave tombstones (kTypeDeletion) for filtered keys.
compaction_proxy_->key_not_exists_beyond_output_level = true;
std::atomic<bool> seek_done{false};
ROCKSDB_NAMESPACE::port::Thread compaction_thread([&] {
c_iter_->SeekToFirst();
EXPECT_FALSE(c_iter_->Valid());
EXPECT_TRUE(c_iter_->status().IsShutdownInProgress());
seek_done.store(true);
});
// Let key 1 through.
filter.WaitForStall(1);
// Shutdown during compaction filter call for key 2.
filter.WaitForStall(2);
shutting_down_.store(true);
EXPECT_FALSE(seek_done.load());
// Unstall filter and wait for SeekToFirst() to return.
filter.stall_at.store(3);
compaction_thread.join();
assert(seek_done.load());
// Check that filter was never called again.
EXPECT_EQ(2, filter.last_seen.load());
}
// Same as ShuttingDownInFilter, but shutdown happens during filter call for
// a merge operand, not for a value.
TEST_P(CompactionIteratorTest, ShuttingDownInMerge) {
NoMergingMergeOp merge_op;
StallingFilter filter;
InitIterators(
{test::KeyStr("1", 1, kTypeValue), test::KeyStr("2", 2, kTypeMerge),
test::KeyStr("3", 3, kTypeMerge), test::KeyStr("4", 4, kTypeValue)},
{"v1", "v2", "v3", "v4"}, {}, {}, kMaxSequenceNumber, kMaxSequenceNumber,
&merge_op, &filter);
compaction_proxy_->key_not_exists_beyond_output_level = true;
std::atomic<bool> seek_done{false};
ROCKSDB_NAMESPACE::port::Thread compaction_thread([&] {
c_iter_->SeekToFirst();
ASSERT_FALSE(c_iter_->Valid());
ASSERT_TRUE(c_iter_->status().IsShutdownInProgress());
seek_done.store(true);
});
// Let key 1 through.
filter.WaitForStall(1);
// Shutdown during compaction filter call for key 2.
filter.WaitForStall(2);
shutting_down_.store(true);
EXPECT_FALSE(seek_done.load());
// Unstall filter and wait for SeekToFirst() to return.
filter.stall_at.store(3);
compaction_thread.join();
assert(seek_done.load());
// Check that filter was never called again.
EXPECT_EQ(2, filter.last_seen.load());
}
TEST_P(CompactionIteratorTest, SingleMergeOperand) {
class Filter : public CompactionFilter {
Decision FilterV2(int /*level*/, const Slice& key, ValueType t,
const Slice& existing_value, std::string* /*new_value*/,
std::string* /*skip_until*/) const override {
std::string k = key.ToString();
std::string v = existing_value.ToString();
// See InitIterators() call below for the sequence of keys and their
// filtering decisions. Here we closely assert that compaction filter is
// called with the expected keys and only them, and with the right values.
if (k == "a") {
EXPECT_EQ(ValueType::kMergeOperand, t);
EXPECT_EQ("av1", v);
return Decision::kKeep;
} else if (k == "b") {
EXPECT_EQ(ValueType::kMergeOperand, t);
return Decision::kKeep;
} else if (k == "c") {
return Decision::kKeep;
}
ADD_FAILURE();
return Decision::kKeep;
}
const char* Name() const override {
return "CompactionIteratorTest.SingleMergeOperand::Filter";
}
};
class SingleMergeOp : public MergeOperator {
public:
bool FullMergeV2(const MergeOperationInput& merge_in,
MergeOperationOutput* merge_out) const override {
// See InitIterators() call below for why "c" is the only key for which
// FullMergeV2 should be called.
EXPECT_EQ("c", merge_in.key.ToString());
std::string temp_value;
if (merge_in.existing_value != nullptr) {
temp_value = merge_in.existing_value->ToString();
}
for (auto& operand : merge_in.operand_list) {
temp_value.append(operand.ToString());
}
merge_out->new_value = temp_value;
return true;
}
bool PartialMergeMulti(const Slice& key,
const std::deque<Slice>& operand_list,
std::string* new_value,
Logger* /*logger*/) const override {
std::string string_key = key.ToString();
EXPECT_TRUE(string_key == "a" || string_key == "b");
if (string_key == "a") {
EXPECT_EQ(1, operand_list.size());
} else if (string_key == "b") {
EXPECT_EQ(2, operand_list.size());
}
std::string temp_value;
for (auto& operand : operand_list) {
temp_value.append(operand.ToString());
}
swap(temp_value, *new_value);
return true;
}
const char* Name() const override {
return "CompactionIteratorTest SingleMergeOp";
}
bool AllowSingleOperand() const override { return true; }
};
SingleMergeOp merge_op;
Filter filter;
InitIterators(
// a should invoke PartialMergeMulti with a single merge operand.
{test::KeyStr("a", 50, kTypeMerge),
// b should invoke PartialMergeMulti with two operands.
test::KeyStr("b", 70, kTypeMerge), test::KeyStr("b", 60, kTypeMerge),
// c should invoke FullMerge due to kTypeValue at the beginning.
test::KeyStr("c", 90, kTypeMerge), test::KeyStr("c", 80, kTypeValue)},
{"av1", "bv2", "bv1", "cv2", "cv1"}, {}, {}, kMaxSequenceNumber,
kMaxSequenceNumber, &merge_op, &filter);
c_iter_->SeekToFirst();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ(test::KeyStr("a", 50, kTypeMerge), c_iter_->key().ToString());
ASSERT_EQ("av1", c_iter_->value().ToString());
c_iter_->Next();
ASSERT_TRUE(c_iter_->Valid());
ASSERT_EQ("bv1bv2", c_iter_->value().ToString());
c_iter_->Next();
ASSERT_OK(c_iter_->status());
ASSERT_EQ("cv1cv2", c_iter_->value().ToString());
}
// In bottommost level, values earlier than earliest snapshot can be output
// with sequence = 0.
TEST_P(CompactionIteratorTest, ZeroOutSequenceAtBottomLevel) {
AddSnapshot(1);
RunTest({test::KeyStr("a", 1, kTypeValue), test::KeyStr("b", 2, kTypeValue)},
{"v1", "v2"},
{test::KeyStr("a", 0, kTypeValue), test::KeyStr("b", 2, kTypeValue)},
{"v1", "v2"}, kMaxSequenceNumber /*last_committed_seq*/,
nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
true /*bottommost_level*/);
}
// In bottommost level, deletions earlier than earliest snapshot can be removed
// permanently.
TEST_P(CompactionIteratorTest, RemoveDeletionAtBottomLevel) {
AddSnapshot(1);
RunTest(
{test::KeyStr("a", 1, kTypeDeletion), test::KeyStr("b", 3, kTypeDeletion),
test::KeyStr("b", 1, kTypeValue)},
{"", "", ""},
{test::KeyStr("b", 3, kTypeDeletion), test::KeyStr("b", 0, kTypeValue)},
{"", ""}, kMaxSequenceNumber /*last_committed_seq*/,
nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
true /*bottommost_level*/);
}
// In bottommost level, single deletions earlier than earliest snapshot can be
// removed permanently.
TEST_P(CompactionIteratorTest, RemoveSingleDeletionAtBottomLevel) {
AddSnapshot(1);
RunTest({test::KeyStr("a", 1, kTypeSingleDeletion),
test::KeyStr("b", 2, kTypeSingleDeletion)},
{"", ""}, {test::KeyStr("b", 2, kTypeSingleDeletion)}, {""},
kMaxSequenceNumber /*last_committed_seq*/, nullptr /*merge_operator*/,
nullptr /*compaction_filter*/, true /*bottommost_level*/);
}
TEST_P(CompactionIteratorTest, ConvertToPutAtBottom) {
std::shared_ptr<MergeOperator> merge_op =
MergeOperators::CreateStringAppendOperator();
RunTest({test::KeyStr("a", 4, kTypeMerge), test::KeyStr("a", 3, kTypeMerge),
test::KeyStr("a", 2, kTypeMerge), test::KeyStr("b", 1, kTypeValue)},
{"a4", "a3", "a2", "b1"},
{test::KeyStr("a", 0, kTypeValue), test::KeyStr("b", 0, kTypeValue)},
{"a2,a3,a4", "b1"}, kMaxSequenceNumber /*last_committed_seq*/,
merge_op.get(), nullptr /*compaction_filter*/,
true /*bottomost_level*/);
}
INSTANTIATE_TEST_CASE_P(CompactionIteratorTestInstance, CompactionIteratorTest,
testing::Values(true, false));
// Tests how CompactionIterator work together with SnapshotChecker.
class CompactionIteratorWithSnapshotCheckerTest
: public CompactionIteratorTest {
public:
bool UseSnapshotChecker() const override { return true; }
};
// Uncommitted keys (keys with seq > last_committed_seq) should be output as-is
// while committed version of these keys should get compacted as usual.
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
PreserveUncommittedKeys_Value) {
RunTest(
{test::KeyStr("foo", 3, kTypeValue), test::KeyStr("foo", 2, kTypeValue),
test::KeyStr("foo", 1, kTypeValue)},
{"v3", "v2", "v1"},
{test::KeyStr("foo", 3, kTypeValue), test::KeyStr("foo", 2, kTypeValue)},
{"v3", "v2"}, 2 /*last_committed_seq*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
PreserveUncommittedKeys_Deletion) {
RunTest({test::KeyStr("foo", 2, kTypeDeletion),
test::KeyStr("foo", 1, kTypeValue)},
{"", "v1"},
{test::KeyStr("foo", 2, kTypeDeletion),
test::KeyStr("foo", 1, kTypeValue)},
{"", "v1"}, 1 /*last_committed_seq*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
PreserveUncommittedKeys_Merge) {
auto merge_op = MergeOperators::CreateStringAppendOperator();
RunTest(
{test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 2, kTypeMerge),
test::KeyStr("foo", 1, kTypeValue)},
{"v3", "v2", "v1"},
{test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 2, kTypeValue)},
{"v3", "v1,v2"}, 2 /*last_committed_seq*/, merge_op.get());
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
PreserveUncommittedKeys_SingleDelete) {
RunTest({test::KeyStr("foo", 2, kTypeSingleDeletion),
test::KeyStr("foo", 1, kTypeValue)},
{"", "v1"},
{test::KeyStr("foo", 2, kTypeSingleDeletion),
test::KeyStr("foo", 1, kTypeValue)},
{"", "v1"}, 1 /*last_committed_seq*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
PreserveUncommittedKeys_BlobIndex) {
RunTest({test::KeyStr("foo", 3, kTypeBlobIndex),
test::KeyStr("foo", 2, kTypeBlobIndex),
test::KeyStr("foo", 1, kTypeBlobIndex)},
{"v3", "v2", "v1"},
{test::KeyStr("foo", 3, kTypeBlobIndex),
test::KeyStr("foo", 2, kTypeBlobIndex)},
{"v3", "v2"}, 2 /*last_committed_seq*/);
}
// Test compaction iterator dedup keys visible to the same snapshot.
TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_Value) {
AddSnapshot(2, 1);
RunTest(
{test::KeyStr("foo", 4, kTypeValue), test::KeyStr("foo", 3, kTypeValue),
test::KeyStr("foo", 2, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
{"v4", "v3", "v2", "v1"},
{test::KeyStr("foo", 4, kTypeValue), test::KeyStr("foo", 3, kTypeValue),
test::KeyStr("foo", 1, kTypeValue)},
{"v4", "v3", "v1"}, 3 /*last_committed_seq*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_Deletion) {
AddSnapshot(2, 1);
RunTest(
{test::KeyStr("foo", 4, kTypeValue),
test::KeyStr("foo", 3, kTypeDeletion),
test::KeyStr("foo", 2, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
{"v4", "", "v2", "v1"},
{test::KeyStr("foo", 4, kTypeValue),
test::KeyStr("foo", 3, kTypeDeletion),
test::KeyStr("foo", 1, kTypeValue)},
{"v4", "", "v1"}, 3 /*last_committed_seq*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_Merge) {
AddSnapshot(2, 1);
AddSnapshot(4, 3);
auto merge_op = MergeOperators::CreateStringAppendOperator();
RunTest(
{test::KeyStr("foo", 5, kTypeMerge), test::KeyStr("foo", 4, kTypeMerge),
test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 2, kTypeMerge),
test::KeyStr("foo", 1, kTypeValue)},
{"v5", "v4", "v3", "v2", "v1"},
{test::KeyStr("foo", 5, kTypeMerge), test::KeyStr("foo", 4, kTypeMerge),
test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 1, kTypeValue)},
{"v5", "v4", "v2,v3", "v1"}, 4 /*last_committed_seq*/, merge_op.get());
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
DedupSameSnapshot_SingleDeletion) {
AddSnapshot(2, 1);
RunTest(
{test::KeyStr("foo", 4, kTypeValue),
test::KeyStr("foo", 3, kTypeSingleDeletion),
test::KeyStr("foo", 2, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
{"v4", "", "v2", "v1"},
{test::KeyStr("foo", 4, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
{"v4", "v1"}, 3 /*last_committed_seq*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_BlobIndex) {
AddSnapshot(2, 1);
RunTest({test::KeyStr("foo", 4, kTypeBlobIndex),
test::KeyStr("foo", 3, kTypeBlobIndex),
test::KeyStr("foo", 2, kTypeBlobIndex),
test::KeyStr("foo", 1, kTypeBlobIndex)},
{"v4", "v3", "v2", "v1"},
{test::KeyStr("foo", 4, kTypeBlobIndex),
test::KeyStr("foo", 3, kTypeBlobIndex),
test::KeyStr("foo", 1, kTypeBlobIndex)},
{"v4", "v3", "v1"}, 3 /*last_committed_seq*/);
}
// At bottom level, sequence numbers can be zero out, and deletions can be
// removed, but only when they are visible to earliest snapshot.
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
NotZeroOutSequenceIfNotVisibleToEarliestSnapshot) {
AddSnapshot(2, 1);
RunTest({test::KeyStr("a", 1, kTypeValue), test::KeyStr("b", 2, kTypeValue),
test::KeyStr("c", 3, kTypeValue)},
{"v1", "v2", "v3"},
{test::KeyStr("a", 0, kTypeValue), test::KeyStr("b", 2, kTypeValue),
test::KeyStr("c", 3, kTypeValue)},
{"v1", "v2", "v3"}, kMaxSequenceNumber /*last_committed_seq*/,
nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
true /*bottommost_level*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
NotRemoveDeletionIfNotVisibleToEarliestSnapshot) {
AddSnapshot(2, 1);
RunTest(
{test::KeyStr("a", 1, kTypeDeletion), test::KeyStr("b", 2, kTypeDeletion),
test::KeyStr("c", 3, kTypeDeletion)},
{"", "", ""}, {}, {"", ""}, kMaxSequenceNumber /*last_committed_seq*/,
nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
true /*bottommost_level*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
NotRemoveDeletionIfValuePresentToEarlierSnapshot) {
AddSnapshot(2,1);
RunTest({test::KeyStr("a", 4, kTypeDeletion),
test::KeyStr("a", 1, kTypeValue), test::KeyStr("b", 3, kTypeValue)},
{"", "", ""},
{test::KeyStr("a", 4, kTypeDeletion),
test::KeyStr("a", 0, kTypeValue), test::KeyStr("b", 3, kTypeValue)},
{"", "", ""}, kMaxSequenceNumber /*last_committed_seq*/,
nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
true /*bottommost_level*/);
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
NotRemoveSingleDeletionIfNotVisibleToEarliestSnapshot) {
AddSnapshot(2, 1);
RunTest({test::KeyStr("a", 1, kTypeSingleDeletion),
test::KeyStr("b", 2, kTypeSingleDeletion),
test::KeyStr("c", 3, kTypeSingleDeletion)},
{"", "", ""},
{test::KeyStr("b", 2, kTypeSingleDeletion),
test::KeyStr("c", 3, kTypeSingleDeletion)},
{"", ""}, kMaxSequenceNumber /*last_committed_seq*/,
nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
true /*bottommost_level*/);
}
// Single delete should not cancel out values that not visible to the
// same set of snapshots
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
SingleDeleteAcrossSnapshotBoundary) {
AddSnapshot(2, 1);
RunTest({test::KeyStr("a", 2, kTypeSingleDeletion),
test::KeyStr("a", 1, kTypeValue)},
{"", "v1"},
{test::KeyStr("a", 2, kTypeSingleDeletion),
test::KeyStr("a", 1, kTypeValue)},
{"", "v1"}, 2 /*last_committed_seq*/);
}
// Single delete should be kept in case it is not visible to the
// earliest write conflict snapshot. If a single delete is kept for this reason,
// corresponding value can be trimmed to save space.
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
KeepSingleDeletionForWriteConflictChecking) {
AddSnapshot(2, 0);
RunTest({test::KeyStr("a", 2, kTypeSingleDeletion),
test::KeyStr("a", 1, kTypeValue)},
{"", "v1"},
{test::KeyStr("a", 2, kTypeSingleDeletion),
test::KeyStr("a", 1, kTypeValue)},
{"", ""}, 2 /*last_committed_seq*/, nullptr /*merge_operator*/,
nullptr /*compaction_filter*/, false /*bottommost_level*/,
2 /*earliest_write_conflict_snapshot*/);
}
// Same as above but with a blob index. In addition to the value getting
// trimmed, the type of the KV is changed to kTypeValue.
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
KeepSingleDeletionForWriteConflictChecking_BlobIndex) {
AddSnapshot(2, 0);
RunTest({test::KeyStr("a", 2, kTypeSingleDeletion),
test::KeyStr("a", 1, kTypeBlobIndex)},
{"", "fake_blob_index"},
{test::KeyStr("a", 2, kTypeSingleDeletion),
test::KeyStr("a", 1, kTypeValue)},
{"", ""}, 2 /*last_committed_seq*/, nullptr /*merge_operator*/,
nullptr /*compaction_filter*/, false /*bottommost_level*/,
2 /*earliest_write_conflict_snapshot*/);
}
// Compaction filter should keep uncommitted key as-is, and
// * Convert the latest value to deletion, and/or
// * if latest value is a merge, apply filter to all subsequent merges.
TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_Value) {
std::unique_ptr<CompactionFilter> compaction_filter(
new FilterAllKeysCompactionFilter());
RunTest(
{test::KeyStr("a", 2, kTypeValue), test::KeyStr("a", 1, kTypeValue),
test::KeyStr("b", 3, kTypeValue), test::KeyStr("c", 1, kTypeValue)},
{"v2", "v1", "v3", "v4"},
{test::KeyStr("a", 2, kTypeValue), test::KeyStr("a", 1, kTypeDeletion),
test::KeyStr("b", 3, kTypeValue), test::KeyStr("c", 1, kTypeDeletion)},
{"v2", "", "v3", ""}, 1 /*last_committed_seq*/,
nullptr /*merge_operator*/, compaction_filter.get());
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_Deletion) {
std::unique_ptr<CompactionFilter> compaction_filter(
new FilterAllKeysCompactionFilter());
RunTest(
{test::KeyStr("a", 2, kTypeDeletion), test::KeyStr("a", 1, kTypeValue)},
{"", "v1"},
{test::KeyStr("a", 2, kTypeDeletion),
test::KeyStr("a", 1, kTypeDeletion)},
{"", ""}, 1 /*last_committed_seq*/, nullptr /*merge_operator*/,
compaction_filter.get());
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest,
CompactionFilter_PartialMerge) {
std::shared_ptr<MergeOperator> merge_op =
MergeOperators::CreateStringAppendOperator();
std::unique_ptr<CompactionFilter> compaction_filter(
new FilterAllKeysCompactionFilter());
RunTest({test::KeyStr("a", 3, kTypeMerge), test::KeyStr("a", 2, kTypeMerge),
test::KeyStr("a", 1, kTypeMerge)},
{"v3", "v2", "v1"}, {test::KeyStr("a", 3, kTypeMerge)}, {"v3"},
2 /*last_committed_seq*/, merge_op.get(), compaction_filter.get());
}
TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_FullMerge) {
std::shared_ptr<MergeOperator> merge_op =
MergeOperators::CreateStringAppendOperator();
std::unique_ptr<CompactionFilter> compaction_filter(
new FilterAllKeysCompactionFilter());
RunTest(
{test::KeyStr("a", 3, kTypeMerge), test::KeyStr("a", 2, kTypeMerge),
test::KeyStr("a", 1, kTypeValue)},
{"v3", "v2", "v1"},
{test::KeyStr("a", 3, kTypeMerge), test::KeyStr("a", 1, kTypeDeletion)},
{"v3", ""}, 2 /*last_committed_seq*/, merge_op.get(),
compaction_filter.get());
}
// Tests how CompactionIterator work together with AllowIngestBehind.
class CompactionIteratorWithAllowIngestBehindTest
: public CompactionIteratorTest {
public:
bool AllowIngestBehind() const override { return true; }
};
// When allow_ingest_behind is set, compaction iterator is not targeting
// the bottommost level since there is no guarantee there won't be further
// data ingested under the compaction output in future.
TEST_P(CompactionIteratorWithAllowIngestBehindTest, NoConvertToPutAtBottom) {
std::shared_ptr<MergeOperator> merge_op =
MergeOperators::CreateStringAppendOperator();
RunTest({test::KeyStr("a", 4, kTypeMerge), test::KeyStr("a", 3, kTypeMerge),
test::KeyStr("a", 2, kTypeMerge), test::KeyStr("b", 1, kTypeValue)},
{"a4", "a3", "a2", "b1"},
{test::KeyStr("a", 4, kTypeMerge), test::KeyStr("b", 1, kTypeValue)},
{"a2,a3,a4", "b1"}, kMaxSequenceNumber /*last_committed_seq*/,
merge_op.get(), nullptr /*compaction_filter*/,
true /*bottomost_level*/);
}
TEST_P(CompactionIteratorWithAllowIngestBehindTest,
MergeToPutIfEncounteredPutAtBottom) {
std::shared_ptr<MergeOperator> merge_op =
MergeOperators::CreateStringAppendOperator();
RunTest({test::KeyStr("a", 4, kTypeMerge), test::KeyStr("a", 3, kTypeMerge),
test::KeyStr("a", 2, kTypeValue), test::KeyStr("b", 1, kTypeValue)},
{"a4", "a3", "a2", "b1"},
{test::KeyStr("a", 4, kTypeValue), test::KeyStr("b", 1, kTypeValue)},
{"a2,a3,a4", "b1"}, kMaxSequenceNumber /*last_committed_seq*/,
merge_op.get(), nullptr /*compaction_filter*/,
true /*bottomost_level*/);
}
INSTANTIATE_TEST_CASE_P(CompactionIteratorWithAllowIngestBehindTestInstance,
CompactionIteratorWithAllowIngestBehindTest,
testing::Values(true, false));
class CompactionIteratorTsGcTest : public CompactionIteratorTest {
public:
CompactionIteratorTsGcTest()
: CompactionIteratorTest(test::ComparatorWithU64Ts()) {}
};
TEST_P(CompactionIteratorTsGcTest, NoKeyEligibleForGC) {
constexpr char user_key[][2] = {{'a', '\0'}, {'b', '\0'}};
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key[0], /*seq=*/4, kTypeValue),
test::KeyStr(/*ts=*/102, user_key[0], /*seq=*/3,
kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/104, user_key[1], /*seq=*/5, kTypeValue)};
const std::vector<std::string> input_values = {"a3", "", "b2"};
std::string full_history_ts_low;
// All keys' timestamps are newer than or equal to 102, thus none of them
// will be eligible for GC.
PutFixed64(&full_history_ts_low, 102);
const std::vector<std::string>& expected_keys = input_keys;
const std::vector<std::string>& expected_values = input_values;
const std::vector<std::pair<bool, bool>> params = {
{false, false}, {false, true}, {true, true}};
for (const std::pair<bool, bool>& param : params) {
const bool bottommost_level = param.first;
const bool key_not_exists_beyond_output_level = param.second;
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
bottommost_level,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
key_not_exists_beyond_output_level, &full_history_ts_low);
}
}
TEST_P(CompactionIteratorTsGcTest, AllKeysOlderThanThreshold) {
constexpr char user_key[][2] = {{'a', '\0'}, {'b', '\0'}};
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key[0], /*seq=*/4,
kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/102, user_key[0], /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/101, user_key[0], /*seq=*/2, kTypeValue),
test::KeyStr(/*ts=*/104, user_key[1], /*seq=*/5, kTypeValue)};
const std::vector<std::string> input_values = {"", "a2", "a1", "b5"};
std::string full_history_ts_low;
PutFixed64(&full_history_ts_low, std::numeric_limits<uint64_t>::max());
{
// With a snapshot at seq 3, both the deletion marker and the key at 3 must
// be preserved.
AddSnapshot(3);
const std::vector<std::string> expected_keys = {
input_keys[0], input_keys[1], input_keys[3]};
const std::vector<std::string> expected_values = {"", "a2", "b5"};
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/false, &full_history_ts_low);
ClearSnapshots();
}
{
// No snapshot, the deletion marker should be preserved because the user
// key may appear beyond output level.
const std::vector<std::string> expected_keys = {input_keys[0],
input_keys[3]};
const std::vector<std::string> expected_values = {"", "b5"};
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/false, &full_history_ts_low);
}
{
// No snapshot, the deletion marker can be dropped because the user key
// does not appear in higher levels.
const std::vector<std::string> expected_keys = {input_keys[3]};
const std::vector<std::string> expected_values = {"b5"};
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/true, &full_history_ts_low);
}
}
TEST_P(CompactionIteratorTsGcTest, NewHidesOldSameSnapshot) {
constexpr char user_key[] = "a";
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key, /*seq=*/4, kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/102, user_key, /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/101, user_key, /*seq=*/2, kTypeValue),
test::KeyStr(/*ts=*/100, user_key, /*seq=*/1, kTypeValue)};
const std::vector<std::string> input_values = {"", "a2", "a1", "a0"};
{
std::string full_history_ts_low;
// Keys whose timestamps larger than or equal to 102 will be preserved.
PutFixed64(&full_history_ts_low, 102);
const std::vector<std::string> expected_keys = {
input_keys[0], input_keys[1], input_keys[2]};
const std::vector<std::string> expected_values = {"", input_values[1],
input_values[2]};
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/false, &full_history_ts_low);
}
}
TEST_P(CompactionIteratorTsGcTest, DropTombstones) {
constexpr char user_key[] = "a";
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key, /*seq=*/4, kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/102, user_key, /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/101, user_key, /*seq=*/2, kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/100, user_key, /*seq=*/1, kTypeValue)};
const std::vector<std::string> input_values = {"", "a2", "", "a0"};
const std::vector<std::string> expected_keys = {input_keys[0], input_keys[1]};
const std::vector<std::string> expected_values = {"", "a2"};
// Take a snapshot at seq 2.
AddSnapshot(2);
{
// Non-bottommost level, but key does not exist beyond output level.
std::string full_history_ts_low;
PutFixed64(&full_history_ts_low, 102);
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_sequence=*/kMaxSequenceNumber,
/*merge_op=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/true, &full_history_ts_low);
}
{
// Bottommost level
std::string full_history_ts_low;
PutFixed64(&full_history_ts_low, 102);
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/true,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/false, &full_history_ts_low);
}
}
TEST_P(CompactionIteratorTsGcTest, RewriteTs) {
constexpr char user_key[] = "a";
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key, /*seq=*/4, kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/102, user_key, /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/101, user_key, /*seq=*/2, kTypeDeletionWithTimestamp),
test::KeyStr(/*ts=*/100, user_key, /*seq=*/1, kTypeValue)};
const std::vector<std::string> input_values = {"", "a2", "", "a0"};
const std::vector<std::string> expected_keys = {
input_keys[0], input_keys[1], input_keys[2],
test::KeyStr(/*ts=*/0, user_key, /*seq=*/0, kTypeValue)};
const std::vector<std::string> expected_values = {"", "a2", "", "a0"};
AddSnapshot(1);
AddSnapshot(2);
{
// Bottommost level and need to rewrite both ts and seq.
std::string full_history_ts_low;
PutFixed64(&full_history_ts_low, 102);
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/true,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/true, &full_history_ts_low);
}
}
TEST_P(CompactionIteratorTsGcTest, SingleDeleteNoKeyEligibleForGC) {
constexpr char user_key[][2] = {{'a', '\0'}, {'b', '\0'}};
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/104, user_key[0], /*seq=*/4, kTypeSingleDeletion),
test::KeyStr(/*ts=*/103, user_key[0], /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/102, user_key[1], /*seq=*/2, kTypeValue)};
const std::vector<std::string> input_values = {"", "a3", "b2"};
std::string full_history_ts_low;
// All keys' timestamps are newer than or equal to 102, thus none of them
// will be eligible for GC.
PutFixed64(&full_history_ts_low, 102);
const std::vector<std::string>& expected_keys = input_keys;
const std::vector<std::string>& expected_values = input_values;
const std::vector<std::pair<bool, bool>> params = {
{false, false}, {false, true}, {true, true}};
for (const std::pair<bool, bool>& param : params) {
const bool bottommost_level = param.first;
const bool key_not_exists_beyond_output_level = param.second;
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
bottommost_level,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
key_not_exists_beyond_output_level, &full_history_ts_low);
}
}
TEST_P(CompactionIteratorTsGcTest, SingleDeleteDropTombstones) {
constexpr char user_key[] = "a";
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key, /*seq=*/4, kTypeSingleDeletion),
test::KeyStr(/*ts=*/102, user_key, /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/101, user_key, /*seq=*/2, kTypeSingleDeletion),
test::KeyStr(/*ts=*/100, user_key, /*seq=*/1, kTypeValue)};
const std::vector<std::string> input_values = {"", "a2", "", "a0"};
const std::vector<std::string> expected_keys = {input_keys[0], input_keys[1]};
const std::vector<std::string> expected_values = {"", "a2"};
// Take a snapshot at seq 2.
AddSnapshot(2);
{
const std::vector<std::pair<bool, bool>> params = {
{false, false}, {false, true}, {true, true}};
for (const std::pair<bool, bool>& param : params) {
const bool bottommost_level = param.first;
const bool key_not_exists_beyond_output_level = param.second;
std::string full_history_ts_low;
PutFixed64(&full_history_ts_low, 102);
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
bottommost_level,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
key_not_exists_beyond_output_level, &full_history_ts_low);
}
}
}
TEST_P(CompactionIteratorTsGcTest, SingleDeleteAllKeysOlderThanThreshold) {
constexpr char user_key[][2] = {{'a', '\0'}, {'b', '\0'}};
const std::vector<std::string> input_keys = {
test::KeyStr(/*ts=*/103, user_key[0], /*seq=*/4, kTypeSingleDeletion),
test::KeyStr(/*ts=*/102, user_key[0], /*seq=*/3, kTypeValue),
test::KeyStr(/*ts=*/104, user_key[1], /*seq=*/5, kTypeValue)};
const std::vector<std::string> input_values = {"", "a2", "b5"};
std::string full_history_ts_low;
PutFixed64(&full_history_ts_low, std::numeric_limits<uint64_t>::max());
{
// With a snapshot at seq 3, both the deletion marker and the key at 3 must
// be preserved.
AddSnapshot(3);
const std::vector<std::string> expected_keys = {
input_keys[0], input_keys[1], input_keys[2]};
const std::vector<std::string> expected_values = {"", "a2", "b5"};
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/false, &full_history_ts_low);
ClearSnapshots();
}
{
// No snapshot.
const std::vector<std::string> expected_keys = {input_keys[2]};
const std::vector<std::string> expected_values = {"b5"};
RunTest(input_keys, input_values, expected_keys, expected_values,
/*last_committed_seq=*/kMaxSequenceNumber,
/*merge_operator=*/nullptr, /*compaction_filter=*/nullptr,
/*bottommost_level=*/false,
/*earliest_write_conflict_snapshot=*/kMaxSequenceNumber,
/*key_not_exists_beyond_output_level=*/false, &full_history_ts_low);
}
}
INSTANTIATE_TEST_CASE_P(CompactionIteratorTsGcTestInstance,
CompactionIteratorTsGcTest,
testing::Values(true, false));
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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