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https://issues.apache.org/jira/browse/CASSANDRA-14466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16504956#comment-16504956
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Robert Stupp commented on CASSANDRA-14466:
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[~mulugetam], let's wait with a patch for review until CASSANDRA-9608 is
actually in or nearly ready. For C* 4.0, we'd need a solution that works with
both Java 8 _and_ 11 - i.e. works as now for Java 8 and can use direct-I/O w/
Java 11 (see the recent discussion on the dev-ML). I think, a multi-release-JAR
is probably the easiest way forward and I have something lying around but not
yet ready - but the final solution obviously depends on whether reflection or
separate classes for 8 + 11 are easier to implement.
> 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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