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

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sdong 92a9ccf1a6 Add a new compaction priority that picks file whose overlapping ratio is smallest ... Summary: Add a new compaction priority as following: For every file, we calculate total size of files overalapping with the file in the next level, over the file's size itself. The file with smallest ratio will be picked first. My "db_bench --fillrandom" shows about 5% less compaction than kOldestSmallestSeqFirst if --hard_pending_compaction_bytes_limit value to keep LSM tree in shape. If not limiting hard_pending_compaction_bytes_limit, improvement is only 1% or 2%. Test Plan: Add a unit test Reviewers: andrewkr, kradhakrishnan, anthony, IslamAbdelRahman, yhchiang Reviewed By: yhchiang Subscribers: MarkCallaghan, leveldb, dhruba Differential Revision: https://reviews.facebook.net/D54075		9 years ago
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rocksdb	Add a new compaction priority that picks file whose overlapping ratio is smallest	9 years ago