Dhruba Borthakur 1ca0584345 This is the mega-patch multi-threaded compaction ... published in https://reviews.facebook.net/D5997. Summary: This patch allows compaction to occur in multiple background threads concurrently. If a manual compaction is issued, the system falls back to a single-compaction-thread model. This is done to ensure correctess and simplicity of code. When the manual compaction is finished, the system resumes its concurrent-compaction mode automatically. The updates to the manifest are done via group-commit approach. Test Plan: run db_bench		2012-10-19 14:00:53 -07:00
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leveldb	This is the mega-patch multi-threaded compaction	2012-10-19 14:00:53 -07:00