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Posted to commits@cassandra.apache.org by "Mulugeta Mammo (JIRA)" <ji...@apache.org> on 2018/05/23 21:21:00 UTC
[jira] [Commented] (CASSANDRA-13778) Enable Direct I/O for
non-system SStables operations
[ https://issues.apache.org/jira/browse/CASSANDRA-13778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488063#comment-16488063 ]
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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