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update HISTORY.md for 6.11 release (#6972)

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Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/6972

Reviewed By: zhichao-cao

Differential Revision: D22021953

Pulled By: ajkr

fbshipit-source-id: 4debbafe45b5939fd28549230eebf6006eb43440
This commit is contained in:
Andrew Kryczka 2020-06-12 11:12:55 -07:00 committed by Facebook GitHub Bot
parent 83833637c1
commit af58d92760
1 changed files with 5 additions and 7 deletions
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HISTORY.md
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# Rocksdb Change Log
## Unreleased
### Behavior Changes
* Disable delete triggered compaction (NewCompactOnDeletionCollectorFactory) in universal compaction mode and num_levels = 1 in order to avoid a corruption bug.
* `pin_l0_filter_and_index_blocks_in_cache` no longer applies to L0 files larger than `1.5 * write_buffer_size` to give more predictable memory usage. Such L0 files may exist due to intra-L0 compaction, external file ingestion, or user dynamically changing `write_buffer_size` (note, however, that files that are already pinned will continue being pinned, even after such a dynamic change).
* In point-in-time wal recovery mode, fail database recovery in case of IOError while reading the WAL to avoid data loss.
## 6.11 (6/12/2020)
### Bug Fixes
* Fix consistency checking error swallowing in some cases when options.force_consistency_checks = true.
* Fix possible false NotFound status from batched MultiGet using index type kHashSearch.
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* ldb now uses options.force_consistency_checks = true by default and "--disable_consistency_checks" is added to disable it.
* DB::OpenForReadOnly no longer creates files or directories if the named DB does not exist, unless create_if_missing is set to true.
* The consistency checks that validate LSM state changes (table file additions/deletions during flushes and compactions) are now stricter, more efficient, and no longer optional, i.e. they are performed even if `force_consistency_checks` is `false`.
* Disable delete triggered compaction (NewCompactOnDeletionCollectorFactory) in universal compaction mode and num_levels = 1 in order to avoid a corruption bug.
* `pin_l0_filter_and_index_blocks_in_cache` no longer applies to L0 files larger than `1.5 * write_buffer_size` to give more predictable memory usage. Such L0 files may exist due to intra-L0 compaction, external file ingestion, or user dynamically changing `write_buffer_size` (note, however, that files that are already pinned will continue being pinned, even after such a dynamic change).
* In point-in-time wal recovery mode, fail database recovery in case of IOError while reading the WAL to avoid data loss.
### New Feature
### New Features
* sst_dump to add a new --readahead_size argument. Users can specify read size when scanning the data. Sst_dump also tries to prefetch tail part of the SST files so usually some number of I/Os are saved there too.
* Generate file checksum in SstFileWriter if Options.file_checksum_gen_factory is set. The checksum and checksum function name are stored in ExternalSstFileInfo after the sst file write is finished.
* Add a value_size_soft_limit in read options which limits the cumulative value size of keys read in batches in MultiGet. Once the cumulative value size of found keys exceeds read_options.value_size_soft_limit, all the remaining keys are returned with status Abort without further finding their values. By default the value_size_soft_limit is std::numeric_limits<uint64_t>::max().