40 lines
2.4 KiB
Markdown
40 lines
2.4 KiB
Markdown
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---
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title: RocksDB 5.4.5 Released!
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layout: post
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author: sagar0
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category: blog
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---
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### Public API Change
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* Support dynamically changing `stats_dump_period_sec` option via SetDBOptions().
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* Added ReadOptions::max_skippable_internal_keys to set a threshold to fail a request as incomplete when too many keys are being skipped while using iterators.
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* DB::Get in place of std::string accepts PinnableSlice, which avoids the extra memcpy of value to std::string in most of cases.
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* PinnableSlice releases the pinned resources that contain the value when it is destructed or when ::Reset() is called on it.
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* The old API that accepts std::string, although discouraged, is still supported.
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* Replace Options::use_direct_writes with Options::use_direct_io_for_flush_and_compaction. See Direct IO wiki for details.
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### New Features
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* Memtable flush can be avoided during checkpoint creation if total log file size is smaller than a threshold specified by the user.
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* Introduce level-based L0->L0 compactions to reduce file count, so write delays are incurred less often.
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* (Experimental) Partitioning filters which creates an index on the partitions. The feature can be enabled by setting partition_filters when using kFullFilter. Currently the feature also requires two-level indexing to be enabled. Number of partitions is the same as the number of partitions for indexes, which is controlled by metadata_block_size.
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* DB::ResetStats() to reset internal stats.
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* Added CompactionEventListener and EventListener::OnFlushBegin interfaces.
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* Added DB::CreateColumnFamilie() and DB::DropColumnFamilies() to bulk create/drop column families.
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* Facility for cross-building RocksJava using Docker.
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### Bug Fixes
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* Fix WriteBatchWithIndex address use after scope error.
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* Fix WritableFile buffer size in direct IO.
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* Add prefetch to PosixRandomAccessFile in buffered io.
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* Fix PinnableSlice access invalid address when row cache is enabled.
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* Fix huge fallocate calls fail and make XFS unhappy.
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* Fix memory alignment with logical sector size.
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* Fix alignment in ReadaheadRandomAccessFile.
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* Fix bias with read amplification stats (READ_AMP_ESTIMATE_USEFUL_BYTES and READ_AMP_TOTAL_READ_BYTES).
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* Fix a manual / auto compaction data race.
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* Fix CentOS 5 cross-building of RocksJava.
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* Build and link with ZStd when creating the static RocksJava build.
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* Fix snprintf's usage to be cross-platform.
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* Fix build errors with blob DB.
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* Fix readamp test type inconsistency.
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