fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Siying Dong 95b0e89b5d Improve write buffer manager (and allow the size to be tracked in block cache) ... Summary: Improve write buffer manager in several ways: 1. Size is tracked when arena block is allocated, rather than every allocation, so that it can better track actual memory usage and the tracking overhead is slightly lower. 2. We start to trigger memtable flush when 7/8 of the memory cap hits, instead of 100%, and make 100% much harder to hit. 3. Allow a cache object to be passed into buffer manager and the size allocated by memtable can be costed there. This can help users have one single memory cap across block cache and memtable. Closes https://github.com/facebook/rocksdb/pull/2350 Differential Revision: D5110648 Pulled By: siying fbshipit-source-id: b4238113094bf22574001e446b5d88523ba00017		7 years ago
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rocksdb	Improve write buffer manager (and allow the size to be tracked in block cache)	7 years ago