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

Siying Dong 17a4b75cc3 Always fsync the file after file copying ... Summary: File copying happens when creating checkpoints and bulkloading files from different FS partition. We should fsync the files when copying them to guarantee durability. A side effect will be that the dirty pages in file system buffers won't grow too large. Closes https://github.com/facebook/rocksdb/pull/1728 Differential Revision: D4371083 Pulled By: siying fbshipit-source-id: 579e14c		8 years ago
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checkpoint.cc	Always fsync the file after file copying	8 years ago
checkpoint_test.cc	Fix bug of Checkpoint loses recent transactions with 2PC	8 years ago