1---
2title: RocksDB 5.5.1 Released!
3layout: post
4author: lightmark
5category: blog
6---
7
8### New Features
9* FIFO compaction to support Intra L0 compaction too with CompactionOptionsFIFO.allow_compaction=true.
10* Statistics::Reset() to reset user stats.
11* ldb add option --try_load_options, which will open DB with its own option file.
12* Introduce WriteBatch::PopSavePoint to pop the most recent save point explicitly.
13* Support dynamically change `max_open_files` option via SetDBOptions()
14* Added DB::CreateColumnFamilie() and DB::DropColumnFamilies() to bulk create/drop column families.
15* Add debugging function `GetAllKeyVersions` to see internal versions of a range of keys.
16* Support file ingestion with universal compaction style
17* Support file ingestion behind with option `allow_ingest_behind`
18* New option enable_pipelined_write which may improve write throughput in case writing from multiple threads and WAL enabled.
19
20### Bug Fixes
21* Fix the bug that Direct I/O uses direct reads for non-SST file
22* Fix the bug that flush doesn't respond to fsync result
23