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| -rw-r--r-- | src/rocksdb/docs/_posts/2017-09-28-rocksdb-5-8-released.markdown | 25 |
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diff --git a/src/rocksdb/docs/_posts/2017-09-28-rocksdb-5-8-released.markdown b/src/rocksdb/docs/_posts/2017-09-28-rocksdb-5-8-released.markdown new file mode 100644 index 000000000..a22dcaa1c --- /dev/null +++ b/src/rocksdb/docs/_posts/2017-09-28-rocksdb-5-8-released.markdown @@ -0,0 +1,25 @@ +--- +title: RocksDB 5.8 Released! +layout: post +author: maysamyabandeh +category: blog +--- + +### Public API Change +* Users of `Statistics::getHistogramString()` will see fewer histogram buckets and different bucket endpoints. +* `Slice::compare` and BytewiseComparator `Compare` no longer accept `Slice`s containing nullptr. +* `Transaction::Get` and `Transaction::GetForUpdate` variants with `PinnableSlice` added. + +### New Features +* Add Iterator::Refresh(), which allows users to update the iterator state so that they can avoid some initialization costs of recreating iterators. +* 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. +* 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`. +* Allow merge operator to be called even with a single merge operand during compactions, by appropriately overriding `MergeOperator::AllowSingleOperand`. +* Add `DB::VerifyChecksum()`, which verifies the checksums in all SST files in a running DB. +* Block-based table support for disabling checksums by setting `BlockBasedTableOptions::checksum = kNoChecksum`. + +### Bug Fixes +* Fix wrong latencies in `rocksdb.db.get.micros`, `rocksdb.db.write.micros`, and `rocksdb.sst.read.micros`. +* Fix incorrect dropping of deletions during intra-L0 compaction. +* Fix transient reappearance of keys covered by range deletions when memtable prefix bloom filter is enabled. +* Fix potentially wrong file smallest key when range deletions separated by snapshot are written together. |