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

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Andrew Kryczka 072ae671a7 Apply use_direct_io_for_flush_and_compaction to writes only ... Summary: Previously `DBOptions::use_direct_io_for_flush_and_compaction=true` combined with `DBOptions::use_direct_reads=false` could cause RocksDB to simultaneously read from two file descriptors for the same file, where background reads used direct I/O and foreground reads used buffered I/O. Our measurements found this mixed-mode I/O negatively impacted foreground read perf, compared to when only buffered I/O was used. This PR makes the mixed-mode I/O situation impossible by repurposing `DBOptions::use_direct_io_for_flush_and_compaction` to only apply to background writes, and `DBOptions::use_direct_reads` to apply to all reads. There is no risk of direct background direct writes happening simultaneously with buffered reads since we never read from and write to the same file simultaneously. Closes https://github.com/facebook/rocksdb/pull/3829 Differential Revision: D7915443 Pulled By: ajkr fbshipit-source-id: 78bcbf276449b7e7766ab6b0db246f789fb1b279		6 years ago
..
env.cc	Apply use_direct_io_for_flush_and_compaction to writes only	6 years ago
env_basic_test.cc	Move some files under util/ to separate dirs	7 years ago
env_chroot.cc	Change RocksDB License	7 years ago
env_chroot.h	Change RocksDB License	7 years ago
env_encryption.cc	Fix some typos in comments and docs.	6 years ago
env_hdfs.cc	Disallow compactions if there isn't enough free space	6 years ago
env_posix.cc	Disallow to open RandomRW file if the file doesn't exist	6 years ago
env_test.cc	Disallow to open RandomRW file if the file doesn't exist	6 years ago
io_posix.cc	Second attempt at db_stress crash-recovery verification	6 years ago
io_posix.h	Second attempt at db_stress crash-recovery verification	6 years ago
mock_env.cc	Add virtual Truncate method to Env	6 years ago
mock_env.h	Add virtual Truncate method to Env	6 years ago
mock_env_test.cc	Move some files under util/ to separate dirs	7 years ago
posix_logger.h	Disallow compactions if there isn't enough free space	6 years ago