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Posted to dev@accumulo.apache.org by "Keith Turner (Updated) (JIRA)" <ji...@apache.org> on 2012/01/11 19:35:38 UTC

[jira] [Updated] (ACCUMULO-140) Prevent linux from caching write ahead log files

     [ https://issues.apache.org/jira/browse/ACCUMULO-140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Keith Turner updated ACCUMULO-140:
----------------------------------

    Fix Version/s: 1.5.0
    
> Prevent linux from caching write ahead log files
> ------------------------------------------------
>
>                 Key: ACCUMULO-140
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-140
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: logger
>            Reporter: Keith Turner
>            Assignee: Eric Newton
>             Fix For: 1.5.0
>
>
> While at ApacheCon I attended a talk about Cassandra.  The developer mentioned using posix_fadvise to prevent linux from storing edit/write ahead log data in the page cache.  This sounds great.  Accumulo can do this for its write ahead logs.
> Using posix_fadvise was also mentioned for compactions, this is something Accumulo can not do because its compactions read and write to hdfs.

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