Yi Wu 1ea79a78c9 Optimize sequential insert into memtable - Part 1: Interface ... Summary: Currently our skip-list have an optimization to speedup sequential inserts from a single stream, by remembering the last insert position. We extend the idea to support sequential inserts from multiple streams, and even tolerate small reordering wihtin each stream. This PR is the interface part adding the following: - Add `memtable_insert_prefix_extractor` to allow specifying prefix for each key. - Add `InsertWithHint()` interface to memtable, to allow underlying implementation to return a hint of insert position, which can be later pass back to optimize inserts. - Memtable will maintain a map from prefix to hints and pass the hint via `InsertWithHint()` if `memtable_insert_prefix_extractor` is non-null. Closes https://github.com/facebook/rocksdb/pull/1419 Differential Revision: D4079367 Pulled By: yiwu-arbug fbshipit-source-id: 3555326		2016-11-13 19:09:18 -08:00
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rocksdb	Optimize sequential insert into memtable - Part 1: Interface	2016-11-13 19:09:18 -08:00