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Mulugeta Mammo commented on CASSANDRA-13778:
--------------------------------------------
We have added a Direct IO support based on JDK 10. You may find the details
here: https://issues.apache.org/jira/browse/CASSANDRA-14466.
> 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
> Priority: Major
> Labels: performance
> 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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