Carlos Abad created CASSANDRA-13778:
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Summary: Enable Direct I/O for non-system SStables operations
Key: CASSANDRA-13778
URL: https://issues.apache.org/jira/browse/CASSANDRA-13778
Project: Cassandra
Issue Type: Improvement
Components: Local Write-Read Paths
Reporter: Carlos Abad
Fix For: 4.x
Following the line of other databases (like RocksDB) enable Cassandra to bypass
the Linux Page Cache by using Direct I/O. By enabling this functionality in the
4 main data paths (read/write un/compressed) our internal testing at Intel
shows that using Direct I/O increased performance (latency and throughput)
considerably.
In this implementation not all disk accesses bypass the OS Page Cache, only the
ones targeting a non-system SStable data files do. Disk access to SStables
metadata files -index, crc, system tables, etc- still benefit from the OS Page
Cache.
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