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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7404) Use direct i/o for sequential operations (compaction/streaming)
Date Mon, 16 Jun 2014 22:53:02 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Brown updated CASSANDRA-7404:
-----------------------------------

    Description: Investigate using linux's direct i/o for operations where we read sequentially
through a file (repair and bootstrap streaming, compaction reads, and so on). Direct i/o does
not go through the kernel page page, so it should leave the hot cache pages used for live
reads unaffected.  (was: Investigate using linux's direct i/o for operations where we read
sequentially through a file (repair and bootstrap streaming, compaction reads, and so on).
Direct i/o does not go through the kernel page page, so it should leave the hot cache pages
unaffected.)

> Use direct i/o for sequential operations (compaction/streaming)
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-7404
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7404
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jason Brown
>            Assignee: Jason Brown
>              Labels: performance
>             Fix For: 3.0
>
>
> Investigate using linux's direct i/o for operations where we read sequentially through
a file (repair and bootstrap streaming, compaction reads, and so on). Direct i/o does not
go through the kernel page page, so it should leave the hot cache pages used for live reads
unaffected.



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