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

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Siying Dong 424a524ac9 [Performance Branch] A Hashed Linked List Based Mem Table ... Summary: Implement a mem table, in which keys are hashed based on prefixes. In each bucket, entries are organized in a sorted linked list. It has the same thread safety guarantee as skip list. The motivation is to optimize memory usage for the case that prefix hashing is primary way of seeking to the entry. Compared to hash skip list implementation, this implementation is more memory efficient, but inside each bucket, search is always linear. The target scenario is that there are only very limited number of records in each hash bucket. Test Plan: Add a test case in db_test Reviewers: haobo, kailiu, dhruba Reviewed By: haobo CC: igor, nkg-, leveldb Differential Revision: https://reviews.facebook.net/D14979		11 years ago
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rocksdb	[Performance Branch] A Hashed Linked List Based Mem Table	11 years ago
utilities	Support multi-threaded DisableFileDeletions() and EnableFileDeletions()	11 years ago