rocksdb/db/compaction/compaction_iterator_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).
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
#include <string>
#include <vector>
#include "db/compaction/compaction_iterator.h"
#include "port/port.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "util/string_util.h"
#include "utilities/merge_operators.h"
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
namespace rocksdb {
// 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 Decition::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 InternalIterator {
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)
: keys_(keys), values_(values), current_(keys.size()) {
assert(keys_.size() == values_.size());
}
bool Valid() const override { return current_ < keys_.size(); }
void SeekToFirst() override {
log.emplace_back(Action::Type::SEEK_TO_FIRST);
current_ = 0;
}
void SeekToLast() override { assert(false); }
void Seek(const Slice& target) override {
log.emplace_back(Action::Type::SEEK, target.ToString());
current_ = std::lower_bound(keys_.begin(), keys_.end(), target.ToString()) -
keys_.begin();
}
void SeekForPrev(const Slice& /*target*/) override { assert(false); }
void Next() override {
assert(Valid());
log.emplace_back(Action::Type::NEXT);
current_++;
}
void Prev() override { assert(false); }
Slice key() const override {
assert(Valid());
return Slice(keys_[current_]);
}
Slice value() const override {
assert(Valid());
return Slice(values_[current_]);
}
Status status() const override { return Status::OK(); }
std::vector<Action> log;
private:
std::vector<std::string> keys_;
std::vector<std::string> values_;
size_t current_;
};
class FakeCompaction : public CompactionIterator::CompactionProxy {
public:
FakeCompaction() = default;
int level(size_t /*compaction_input_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 false; }
bool preserve_deletes() const override { return false; }
Added support for differential snapshots Summary: The motivation for this PR is to add to RocksDB support for differential (incremental) snapshots, as snapshot of the DB changes between two points in time (one can think of it as diff between to sequence numbers, or the diff D which can be thought of as an SST file or just set of KVs that can be applied to sequence number S1 to get the database to the state at sequence number S2). This feature would be useful for various distributed storages layers built on top of RocksDB, as it should help reduce resources (time and network bandwidth) needed to recover and rebuilt DB instances as replicas in the context of distributed storages. From the API standpoint that would like client app requesting iterator between (start seqnum) and current DB state, and reading the "diff". This is a very draft PR for initial review in the discussion on the approach, i'm going to rework some parts and keep updating the PR. For now, what's done here according to initial discussions: Preserving deletes: - We want to be able to optionally preserve recent deletes for some defined period of time, so that if a delete came in recently and might need to be included in the next incremental snapshot it would't get dropped by a compaction. This is done by adding new param to Options (preserve deletes flag) and new variable to DB Impl where we keep track of the sequence number after which we don't want to drop tombstones, even if they are otherwise eligible for deletion. - I also added a new API call for clients to be able to advance this cutoff seqnum after which we drop deletes; i assume it's more flexible to let clients control this, since otherwise we'd need to keep some kind of timestamp < -- > seqnum mapping inside the DB, which sounds messy and painful to support. Clients could make use of it by periodically calling GetLatestSequenceNumber(), noting the timestamp, doing some calculation and figuring out by how much we need to advance the cutoff seqnum. - Compaction codepath in compaction_iterator.cc has been modified to avoid dropping tombstones with seqnum > cutoff seqnum. Iterator changes: - couple params added to ReadOptions, to optionally allow client to request internal keys instead of user keys (so that client can get the latest value of a key, be it delete marker or a put), as well as min timestamp and min seqnum. TableCache changes: - I modified table_cache code to be able to quickly exclude SST files from iterators heep if creation_time on the file is less then iter_start_ts as passed in ReadOptions. That would help a lot in some DB settings (like reading very recent data only or using FIFO compactions), but not so much for universal compaction with more or less long iterator time span. What's left: - Still looking at how to best plug that inside DBIter codepath. So far it seems that FindNextUserKeyInternal only parses values as UserKeys, and iter->key() call generally returns user key. Can we add new API to DBIter as internal_key(), and modify this internal method to optionally set saved_key_ to point to the full internal key? I don't need to store actual seqnum there, but I do need to store type. Closes https://github.com/facebook/rocksdb/pull/2999 Differential Revision: D6175602 Pulled By: mikhail-antonov fbshipit-source-id: c779a6696ee2d574d86c69cec866a3ae095aa900
2017-11-02 02:43:29 +01:00
bool key_not_exists_beyond_output_level = false;
bool is_bottommost_level = false;
};
// A simplifed 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> {
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
public:
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
CompactionIteratorTest()
: cmp_(BytewiseComparator()), 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) {
std::unique_ptr<InternalIterator> unfragmented_range_del_iter(
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
new test::VectorIterator(range_del_ks, range_del_vs));
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));
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
std::unique_ptr<CompactionIterator::CompactionProxy> compaction;
if (filter || bottommost_level) {
compaction_proxy_ = new FakeCompaction();
compaction_proxy_->is_bottommost_level = bottommost_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_));
iter_.reset(new LoggingForwardVectorIterator(ks, vs));
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
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(), std::move(compaction), filter, &shutting_down_));
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
}
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; }
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) {
InitIterators(input_keys, input_values, {}, {}, kMaxSequenceNumber,
last_committed_seq, merge_operator, compaction_filter,
bottommost_level, earliest_write_conflict_snapshot);
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_FALSE(c_iter_->Valid());
}
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
const Comparator* cmp_;
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
const InternalKeyComparator icmp_;
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
std::vector<SequenceNumber> snapshots_;
// A map of valid snapshot to last visible sequence to the snapshot.
std::unordered_map<SequenceNumber, SequenceNumber> snapshot_map_;
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
std::unique_ptr<MergeHelper> merge_helper_;
std::unique_ptr<LoggingForwardVectorIterator> iter_;
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
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_;
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
};
// It is possible that the output of the compaction iterator is empty even if
// the input is not.
TEST_P(CompactionIteratorTest, EmptyResult) {
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
InitIterators({test::KeyStr("a", 5, kTypeSingleDeletion),
test::KeyStr("a", 3, kTypeValue)},
{"", "val"}, {}, {}, 5);
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
c_iter_->SeekToFirst();
ASSERT_FALSE(c_iter_->Valid());
}
// If there is a corruption after a single deletion, the corrupted key should
// be preserved.
TEST_P(CompactionIteratorTest, CorruptionAfterSingleDeletion) {
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
InitIterators({test::KeyStr("a", 5, kTypeSingleDeletion),
test::KeyStr("a", 3, kTypeValue, true),
test::KeyStr("b", 10, kTypeValue)},
{"", "val", "val2"}, {}, {}, 10);
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
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_FALSE(c_iter_->Valid());
}
TEST_P(CompactionIteratorTest, SimpleRangeDeletion) {
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
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_FALSE(c_iter_->Valid());
}
TEST_P(CompactionIteratorTest, RangeDeletionWithSnapshots) {
Compaction Support for Range Deletion Summary: This diff introduces RangeDelAggregator, which takes ownership of iterators provided to it via AddTombstones(). The tombstones are organized in a two-level map (snapshot stripe -> begin key -> tombstone). Tombstone creation avoids data copy by holding Slices returned by the iterator, which remain valid thanks to pinning. For compaction, we create a hierarchical range tombstone iterator with structure matching the iterator over compaction input data. An aggregator based on that iterator is used by CompactionIterator to determine which keys are covered by range tombstones. In case of merge operand, the same aggregator is used by MergeHelper. Upon finishing each file in the compaction, relevant range tombstones are added to the output file's range tombstone metablock and file boundaries are updated accordingly. To check whether a key is covered by range tombstone, RangeDelAggregator::ShouldDelete() considers tombstones in the key's snapshot stripe. When this function is used outside of compaction, it also checks newer stripes, which can contain covering tombstones. Currently the intra-stripe check involves a linear scan; however, in the future we plan to collapse ranges within a stripe such that binary search can be used. RangeDelAggregator::AddToBuilder() adds all range tombstones in the table's key-range to a new table's range tombstone meta-block. Since range tombstones may fall in the gap between files, we may need to extend some files' key-ranges. The strategy is (1) first file extends as far left as possible and other files do not extend left, (2) all files extend right until either the start of the next file or the end of the last range tombstone in the gap, whichever comes first. One other notable change is adding release/move semantics to ScopedArenaIterator such that it can be used to transfer ownership of an arena-allocated iterator, similar to how unique_ptr is used for malloc'd data. Depends on D61473 Test Plan: compaction_iterator_test, mock_table, end-to-end tests in D63927 Reviewers: sdong, IslamAbdelRahman, wanning, yhchiang, lightmark Reviewed By: lightmark Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62205
2016-10-18 21:04:56 +02:00
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_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_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::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::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_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_commited_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_commited_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_commited_seq*/, nullptr /*merge_operator*/,
nullptr /*compaction_filter*/, true /*bottommost_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_commited_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_commited_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_commited_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_commited_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*/);
}
// Compaction filter should keep uncommitted key as-is, and
// * Convert the latest velue to deletion, and/or
// * if latest value is a merge, apply filter to all suequent 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());
}
Support for SingleDelete() Summary: This patch fixes #7460559. It introduces SingleDelete as a new database operation. This operation can be used to delete keys that were never overwritten (no put following another put of the same key). If an overwritten key is single deleted the behavior is undefined. Single deletion of a non-existent key has no effect but multiple consecutive single deletions are not allowed (see limitations). In contrast to the conventional Delete() operation, the deletion entry is removed along with the value when the two are lined up in a compaction. Note: The semantics are similar to @igor's prototype that allowed to have this behavior on the granularity of a column family ( https://reviews.facebook.net/D42093 ). This new patch, however, is more aggressive when it comes to removing tombstones: It removes the SingleDelete together with the value whenever there is no snapshot between them while the older patch only did this when the sequence number of the deletion was older than the earliest snapshot. Most of the complex additions are in the Compaction Iterator, all other changes should be relatively straightforward. The patch also includes basic support for single deletions in db_stress and db_bench. Limitations: - Not compatible with cuckoo hash tables - Single deletions cannot be used in combination with merges and normal deletions on the same key (other keys are not affected by this) - Consecutive single deletions are currently not allowed (and older version of this patch supported this so it could be resurrected if needed) Test Plan: make all check Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor Reviewed By: igor Subscribers: maykov, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 20:42:56 +02:00
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}