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https://issues.apache.org/jira/browse/CASSANDRA-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910833#action_12910833
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Jonathan Ellis commented on CASSANDRA-1470:
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It looks like O_DIRECT is the simplest solution and has the most prior art.
Let's go that route either with a patch like Chris's or JNA. (Peter's patch to
CASSANDRA-1214 had a good example of integrating a C patch w/ our ant build,
even though we took the JNA route there.)
> use direct io for compaction
> ----------------------------
>
> Key: CASSANDRA-1470
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1470
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Fix For: 0.6.6
>
> Attachments: 1470-v2.txt, 1470.txt
>
>
> When compaction scans through a group of sstables, it forces the data in the
> os buffer cache being used for hot reads, which can have a dramatic negative
> effect on performance.
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