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https://issues.apache.org/jira/browse/CASSANDRA-7938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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T Jake Luciani updated CASSANDRA-7938:
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Fix Version/s: (was: 1.2.19)
> Releases prior to 2.0 gratuitously invalidate buffer cache
> ----------------------------------------------------------
>
> Key: CASSANDRA-7938
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7938
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Matt Stump
> Attachments: 7938.txt
>
>
> RandomAccessReader gratuitously invalidates the buffer cache in releases
> prior to 2.0.
> Additionally, Linux 3.X kernels spend 30% of CPU time in book keeping for the
> invalidated pages as captured by CPU flame graphs.
> fadvise DONT_NEED should never be called for files other than the commit log
> segments.
> https://github.com/apache/cassandra/blob/cassandra-2.1/src/java/org/apache/cassandra/io/util/RandomAccessReader.java#L168
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