RocksDB 3.2 release

New Features in RocksDB 3.2:

• PlainTable now supports a new key encoding: for keys of the same prefix, the prefix is only written once. It can be enabled through encoding_type paramter of NewPlainTableFactory()
• Add AdaptiveTableFactory, which is used to convert from a DB of PlainTable to BlockBasedTabe, or vise versa. It can be created using NewAdaptiveTableFactory()

Public API changes

• We removed seek compaction as a concept from RocksDB because:
• Add two paramters to NewHashLinkListRepFactory() for logging on too many entries in a hash bucket when flushing.
• Added new option BlockBasedTableOptions::hash_index_allow_collision. When enabled, prefix hash index for block-based table will not store prefix and allow hash collision, reducing memory consumption.

All the commits: 3.1.fb...3.2.fb

RocksDB 3.1

New features in RocksDB 3.1:

• Materialize hash index
• FIFO Compaction

Change LOG: https://github.com/facebook/rocksdb/blob/3.1.fb/HISTORY.md
All the commits: 3.0.fb...3.1.fb

RocksDB 3.0

New features in RocksDB 3.0:

• Column Family support (https://github.com/facebook/rocksdb/wiki/Column-Families)
• Ability to use different checksum function in block based table. You can choose between crc32 and xxHash.
• ReadOptions::prefix_seek and ReadOptions::prefix are deprecated
• Full change log: https://github.com/facebook/rocksdb/blob/3.0.fb/HISTORY.md
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RocksDB 2.8

RocksDB 2.8 release is mostly focused on improving performance for in-memory use cases