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