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| -rw-r--r-- | src/rocksdb/docs/_posts/2017-07-25-rocksdb-5-6-1-released.markdown | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/rocksdb/docs/_posts/2017-07-25-rocksdb-5-6-1-released.markdown b/src/rocksdb/docs/_posts/2017-07-25-rocksdb-5-6-1-released.markdown new file mode 100644 index 000000000..3b54ffd5a --- /dev/null +++ b/src/rocksdb/docs/_posts/2017-07-25-rocksdb-5-6-1-released.markdown @@ -0,0 +1,22 @@ +--- +title: RocksDB 5.6.1 Released! +layout: post +author: yiwu +category: blog +--- + +### Public API Change +* 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. +* 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. +* options.delayed_write_rate by default take the value of options.rate_limiter rate. +* Replace global variable `IOStatsContext iostats_context` with `IOStatsContext* get_iostats_context()`; replace global variable `PerfContext perf_context` with `PerfContext* get_perf_context()`. + +### New Features +* 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. +* 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. +* 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. +* 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. +* `DB::IngestExternalFile()` now supports ingesting files into a database containing range deletions. + +### Bug Fixes +* Shouldn't ignore return value of fsync() in flush. |