[jira] [Commented] (CASSANDRA-14466) Enable Direct I/O

["Mulugeta Mammo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-14466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16873541#comment-16873541 ] 

Mulugeta Mammo commented on CASSANDRA-14466:
--------------------------------------------

[~snazy] The previous PR was several commits behind. Have created a new PR with no conflicts here: [https://github.com/apache/cassandra/pull/329]. Thanks!

> Enable Direct I/O 
> ------------------
>
>                 Key: CASSANDRA-14466
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14466
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Legacy/Local Write-Read Paths
>            Reporter: Mulugeta Mammo
>            Assignee: Mulugeta Mammo
>            Priority: Normal
>
> Hi,
> JDK 10 introduced a new API for Direct IO that enables applications to bypass the file system cache and potentially improve performance. Details of this feature can be found at [https://bugs.openjdk.java.net/browse/JDK-8164900].
> This patch uses the JDK 10 API to enable Direct IO for the Cassandra read path. By default, we have disabled this feature; but it can be enabled using a  new configuration parameter, enable_direct_io_for_read_path. We have conducted a Cassandra read-only stress test and measured a throughput gain of up to 60% on flash drives.
> The patch requires JDK 10 Cassandra Support - https://issues.apache.org/jira/browse/CASSANDRA-9608 
> Please review the patch and let us know your feedback.
> Thanks,
> [^direct_io.patch]
>  



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