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26 lines
1.9 KiB
Markdown
26 lines
1.9 KiB
Markdown
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---
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title: RocksDB 5.8 Released!
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layout: post
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author: maysamyabandeh
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category: blog
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---
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### Public API Change
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* Users of `Statistics::getHistogramString()` will see fewer histogram buckets and different bucket endpoints.
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* `Slice::compare` and BytewiseComparator `Compare` no longer accept `Slice`s containing nullptr.
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* `Transaction::Get` and `Transaction::GetForUpdate` variants with `PinnableSlice` added.
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### New Features
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* Add Iterator::Refresh(), which allows users to update the iterator state so that they can avoid some initialization costs of recreating iterators.
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* Replace dynamic_cast<> (except unit test) so people can choose to build with RTTI off. With make, release mode is by default built with -fno-rtti and debug mode is built without it. Users can override it by setting USE_RTTI=0 or 1.
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* Universal compactions including the bottom level can be executed in a dedicated thread pool. This alleviates head-of-line blocking in the compaction queue, which cause write stalling, particularly in multi-instance use cases. Users can enable this feature via `Env::SetBackgroundThreads(N, Env::Priority::BOTTOM)`, where `N > 0`.
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* Allow merge operator to be called even with a single merge operand during compactions, by appropriately overriding `MergeOperator::AllowSingleOperand`.
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* Add `DB::VerifyChecksum()`, which verifies the checksums in all SST files in a running DB.
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* Block-based table support for disabling checksums by setting `BlockBasedTableOptions::checksum = kNoChecksum`.
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### Bug Fixes
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* Fix wrong latencies in `rocksdb.db.get.micros`, `rocksdb.db.write.micros`, and `rocksdb.sst.read.micros`.
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* Fix incorrect dropping of deletions during intra-L0 compaction.
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* Fix transient reappearance of keys covered by range deletions when memtable prefix bloom filter is enabled.
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* Fix potentially wrong file smallest key when range deletions separated by snapshot are written together.
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