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cherry-picked PR-7680 and fixed HISTORY.md

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Yanqin Jin 2020-11-17 00:43:20 -08:00 committed by Ramkumar Vadivelu
parent 5bd1258381
commit 518431d78e
2 changed files with 11 additions and 1 deletions
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9
HISTORY.md
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@ -1,4 +1,10 @@
# Rocksdb Change Log
<<<<<<< HEAD
=======
## Unreleased
### Behavior Changes
* Attempting to write a merge operand without explicitly configuring `merge_operator` now fails immediately, causing the DB to enter read-only mode. Previously, failure was deferred until the `merge_operator` was needed by a user read or a background operation.
## 6.15.0 (11/13/2020)
### Bug Fixes
* Fixed a bug in the following combination of features: indexes with user keys (`format_version >= 3`), indexes are partitioned (`index_type == kTwoLevelIndexSearch`), and some index partitions are pinned in memory (`BlockBasedTableOptions::pin_l0_filter_and_index_blocks_in_cache`). The bug could cause keys to be truncated when read from the index leading to wrong read results or other unexpected behavior.
@ -13,6 +19,9 @@
* Fixed MultiGet bugs it doesn't return valid data with user defined timestamp.
* Fixed a potential bug caused by evaluating `TableBuilder::NeedCompact()` before `TableBuilder::Finish()` in compaction job. For example, the `NeedCompact()` method of `CompactOnDeletionCollector` returned by built-in `CompactOnDeletionCollectorFactory` requires `BlockBasedTable::Finish()` to return the correct result. The bug can cause a compaction-generated file not to be marked for future compaction based on deletion ratio.
* Fixed a seek issue with prefix extractor and timestamp.
* Fixed a bug of encoding and parsing BlockBasedTableOptions::read_amp_bytes_per_bit as a 64-bit integer.
* Fixed the logic of populating native data structure for `read_amp_bytes_per_bit` during OPTIONS file parsing on big-endian architecture. Without this fix, original code introduced in PR7659, when running on big-endian machine, can mistakenly store read_amp_bytes_per_bit (an uint32) in little endian format. Future access to `read_amp_bytes_per_bit` will give wrong values. Little endian architecture is not affected.
### Public API Change
* Deprecate `BlockBasedTableOptions::pin_l0_filter_and_index_blocks_in_cache` and `BlockBasedTableOptions::pin_top_level_index_and_filter`. These options still take effect until users migrate to the replacement APIs in `BlockBasedTableOptions::metadata_cache_options`. Migration guidance can be found in the API comments on the deprecated options.

3
table/block_based/block_based_table_factory.cc
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@ -373,7 +373,8 @@ static std::unordered_map<std::string, OptionTypeInfo>
// generated by affected releases before the fix, we need to
// manually parse read_amp_bytes_per_bit with this special hack.
uint64_t read_amp_bytes_per_bit = ParseUint64(value);
EncodeFixed32(addr, static_cast<uint32_t>(read_amp_bytes_per_bit));
*(reinterpret_cast<uint32_t*>(addr)) =
static_cast<uint32_t>(read_amp_bytes_per_bit);
return Status::OK();
}}},
{"enable_index_compression",