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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14466) Enable Direct I/O
Date Tue, 05 Jun 2018 22:38:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502601#comment-16502601
] 

ASF GitHub Bot commented on CASSANDRA-14466:
--------------------------------------------

GitHub user aweisberg opened a pull request:

    https://github.com/apache/cassandra/pull/232

    Enable Direct I/O

    Patch by Mulugeta Mammo; Reviewed by Ariel Weisberg for CASSANDRA-14466

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/aweisberg/cassandra cassandra-14466-trunk

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cassandra/pull/232.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #232
    
----
commit d221e254c1d248aafd96ab2c7f3f15751c81d384
Author: =Mulugeta Mammo <mulugeta.mammo@...>
Date:   2018-06-05T22:36:08Z

    Enable Direct I/O
    
    Patch by Mulugeta Mammo; Reviewed by Ariel Weisberg for CASSANDRA-14466

----


> Enable Direct I/O 
> ------------------
>
>                 Key: CASSANDRA-14466
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14466
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Local Write-Read Paths
>            Reporter: Mulugeta Mammo
>            Priority: Major
>         Attachments: direct_io.patch
>
>
> 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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