6de6a06631
Summary: Introducing new compaction style -- FIFO. FIFO compaction style has write amplification of 1 (+1 for WAL) and it deletes the oldest files when the total DB size exceeds pre-configured values. FIFO compaction style is suited for storing high-frequency event logs. Test Plan: Added a unit test Reviewers: dhruba, haobo, sdong Reviewed By: dhruba Subscribers: alberts, leveldb Differential Revision: https://reviews.facebook.net/D18765