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22 lines
1.9 KiB
22 lines
1.9 KiB
---
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title: RocksDB 5.6.1 Released!
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layout: post
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author: yiwu
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category: blog
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---
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### Public API Change
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* Scheduling flushes and compactions in the same thread pool is no longer supported by setting `max_background_flushes=0`. Instead, users can achieve this by configuring their high-pri thread pool to have zero threads. See https://github.com/facebook/rocksdb/wiki/Thread-Pool for more details.
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* Replace `Options::max_background_flushes`, `Options::max_background_compactions`, and `Options::base_background_compactions` all with `Options::max_background_jobs`, which automatically decides how many threads to allocate towards flush/compaction.
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* options.delayed_write_rate by default take the value of options.rate_limiter rate.
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* Replace global variable `IOStatsContext iostats_context` with `IOStatsContext* get_iostats_context()`; replace global variable `PerfContext perf_context` with `PerfContext* get_perf_context()`.
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### New Features
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* Change ticker/histogram statistics implementations to use core-local storage. This improves aggregation speed compared to our previous thread-local approach, particularly for applications with many threads. See http://rocksdb.org/blog/2017/05/14/core-local-stats.html for more details.
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* Users can pass a cache object to write buffer manager, so that they can cap memory usage for memtable and block cache using one single limit.
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* Flush will be triggered when 7/8 of the limit introduced by write_buffer_manager or db_write_buffer_size is triggered, so that the hard threshold is hard to hit. See https://github.com/facebook/rocksdb/wiki/Write-Buffer-Manager for more details.
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* Introduce WriteOptions.low_pri. If it is true, low priority writes will be throttled if the compaction is behind. See https://github.com/facebook/rocksdb/wiki/Low-Priority-Write for more details.
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* `DB::IngestExternalFile()` now supports ingesting files into a database containing range deletions.
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### Bug Fixes
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* Shouldn't ignore return value of fsync() in flush.
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