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update history for 5.6

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Summary:
- mention range deletion + file ingestion
- move post-5.6 stuff into new section
Closes https://github.com/facebook/rocksdb/pull/2440

Differential Revision: D5229910

Pulled By: ajkr

fbshipit-source-id: 1facfe41993fa1f3b1f6fa7dc77d2b11aa2b317a
This commit is contained in:
Andrew Kryczka 2017-06-12 12:27:54 -07:00 committed by Facebook Github Bot
parent 5582123dee
commit e97304c681
1 changed files with 8 additions and 2 deletions
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HISTORY.md
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# Rocksdb Change Log
## Unreleased
### Public API Change
* DB property "rocksdb.sstables" now prints keys in hex form.
### New Features
* Measure estimated number of reads per file. The information can be accessed through DB::GetColumnFamilyMetaData or "rocksdb.sstables" DB property.
## 5.6.0 (06/06/2017)
### 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.
* 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()`.
* DB property "rocksdb.sstables" now prints keys in hex form.
### 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.
* 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.
* Introduce WriteOptions.low_pri. If it is true, low priority writes will be throttled if the compaction is behind.
* Measure estimated number of reads per file. The information can be accessed through DB::GetColumnFamilyMetaData or "rocksdb.sstables" DB property.
* `DB::IngestExternalFile()` now supports ingesting files into a database containing range deletions.
## 5.5.0 (05/17/2017)
### New Features