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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1470) use direct io for compaction
Date Fri, 17 Sep 2010 22:42:35 GMT


Jonathan Ellis commented on CASSANDRA-1470:

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:
>             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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