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Fix merging range tombstone covering put during flush/compaction (#5406)

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Summary:
Flush/compaction use `MergeUntil` which has a special code path to
handle a merge ending with a non-`Merge` point key. In particular if
that key is a `Put` we forgot to check whether it is covered by a range
tombstone. If it is covered then we must not include it in the following call
to `TimedFullMerge`.

Fixes #5392.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5406

Differential Revision: D15611144

Pulled By: sagar0

fbshipit-source-id: ba6a7863ca2d043f591de78fd0c4f4561f0c500e
This commit is contained in:
Andrew Kryczka 2019-06-04 10:17:24 -07:00 committed by Facebook Github Bot
parent c8267120d8
commit ebe89ef9d8
3 changed files with 34 additions and 1 deletions
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1
HISTORY.md
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@ -24,6 +24,7 @@
### Bug Fixes
* Fix a bug in WAL replay of secondary instance by skipping write batches with older sequence numbers than the current last sequence number.
* Fix flush's/compaction's merge processing logic which allowed `Put`s covered by range tombstones to reappear. Note `Put`s may exist even if the user only ever called `Merge()` due to an internal conversion during compaction to the bottommost level.
## 6.2.0 (4/30/2019)
### New Features

24
db/db_range_del_test.cc
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@ -491,6 +491,30 @@ TEST_F(DBRangeDelTest, CompactionRemovesCoveredMergeOperands) {
ASSERT_EQ(expected, actual);
}
TEST_F(DBRangeDelTest, PutDeleteRangeMergeFlush) {
// Test the sequence of operations: (1) Put, (2) DeleteRange, (3) Merge, (4)
// Flush. The `CompactionIterator` previously had a bug where we forgot to
// check for covering range tombstones when processing the (1) Put, causing
// it to reappear after the flush.
Options opts = CurrentOptions();
opts.merge_operator = MergeOperators::CreateUInt64AddOperator();
Reopen(opts);
std::string val;
PutFixed64(&val, 1);
ASSERT_OK(db_->Put(WriteOptions(), "key", val));
ASSERT_OK(db_->DeleteRange(WriteOptions(), db_->DefaultColumnFamily(),
"key", "key_"));
ASSERT_OK(db_->Merge(WriteOptions(), "key", val));
ASSERT_OK(db_->Flush(FlushOptions()));
ReadOptions read_opts;
std::string expected, actual;
ASSERT_OK(db_->Get(read_opts, "key", &actual));
PutFixed64(&expected, 1);
ASSERT_EQ(expected, actual);
}
// NumTableFilesAtLevel() is not supported in ROCKSDB_LITE
#ifndef ROCKSDB_LITE
TEST_F(DBRangeDelTest, ObsoleteTombstoneCleanup) {

10
db/merge_helper.cc
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@ -201,7 +201,15 @@ Status MergeHelper::MergeUntil(InternalIterator* iter,
// want. Also if we're in compaction and it's a put, it would be nice to
// run compaction filter on it.
const Slice val = iter->value();
const Slice* val_ptr = (kTypeValue == ikey.type) ? &val : nullptr;
const Slice* val_ptr;
if (kTypeValue == ikey.type &&
(range_del_agg == nullptr ||
!range_del_agg->ShouldDelete(
ikey, RangeDelPositioningMode::kForwardTraversal))) {
val_ptr = &val;
} else {
val_ptr = nullptr;
}
std::string merge_result;
s = TimedFullMerge(user_merge_operator_, ikey.user_key, val_ptr,
merge_context_.GetOperands(), &merge_result, logger_,