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

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Andrew Kryczka ea9454700a Backup engine support for direct I/O reads (#4640) ... Summary: Use the `DBOptions` that the backup engine already holds to figure out the right `EnvOptions` to use when reading the DB files. This means that, if a user opened a DB instance with `use_direct_reads=true`, then using `BackupEngine` to back up that DB instance will use direct I/O to read files when calculating checksums and copying. Currently the WALs and manifests would still be read using buffered I/O to prevent mixing direct I/O reads with concurrent buffered I/O writes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4640 Differential Revision: D13015268 Pulled By: ajkr fbshipit-source-id: 77006ad6f3e00ce58374ca4793b785eea0db6269		6 years ago
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backupable_db.cc	Backup engine support for direct I/O reads (#4640)	6 years ago
backupable_db_test.cc	Backup engine support for direct I/O reads (#4640)	6 years ago