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Blog post for releasing 5.2.1

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Summary: Closes https://github.com/facebook/rocksdb/pull/2025

Differential Revision: D4759957

Pulled By: siying

fbshipit-source-id: 5b5b625
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Siying Dong 2017-03-22 17:45:15 -07:00 committed by Facebook Github Bot
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---
title: RocksDB 5.2.1 Released!
layout: post
author: sdong
category: blog
---
### Public API Change
* NewLRUCache() will determine number of shard bits automatically based on capacity, if the user doesn't pass one. This also impacts the default block cache when the user doesn't explict provide one.
* Change the default of delayed slowdown value to 16MB/s and further increase the L0 stop condition to 36 files.
### New Features
* Added new overloaded function GetApproximateSizes that allows to specify if memtable stats should be computed only without computing SST files' stats approximations.
* Added new function GetApproximateMemTableStats that approximates both number of records and size of memtables.
* (Experimental) Two-level indexing that partition the index and creates a 2nd level index on the partitions. The feature can be enabled by setting kTwoLevelIndexSearch as IndexType and configuring index_per_partition.
### Bug Fixes
* RangeSync() should work if ROCKSDB_FALLOCATE_PRESENT is not set
* Fix wrong results in a data race case in Get()
* Some fixes related to 2PC.
* Fix several bugs in Direct I/O supports.
* Fix a regression bug which can cause Seek() to miss some keys if the return key has been updated many times after the snapshot which is used by the iterator.