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

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Siying Dong aa0ef6602d [Performance Branch] If options.max_open_files set to be -1, cache table readers in FileMetadata for Get() and NewIterator() ... Summary: In some use cases, table readers for all live files should always be cached. In that case, there will be an opportunity to avoid the table cache look-up while Get() and NewIterator(). We define options.max_open_files = -1 to be the mode that table readers for live files will always be kept. In that mode, table readers are cached in FileMetaData (with a reference count hold in table cache). So that when executing table_cache.Get() and table_cache.newInterator(), LRU cache checking can be by-passed, to reduce latency. Test Plan: add a test case in db_test Reviewers: haobo, kailiu Reviewed By: haobo CC: dhruba, igor, leveldb Differential Revision: https://reviews.facebook.net/D15039		11 years ago
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rocksdb	[Performance Branch] If options.max_open_files set to be -1, cache table readers in FileMetadata for Get() and NewIterator()	11 years ago
utilities	Support multi-threaded DisableFileDeletions() and EnableFileDeletions()	11 years ago