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Posted to dev@accumulo.apache.org by "Keith Turner (Commented) (JIRA)" <ji...@apache.org> on 2011/11/12 01:24:51 UTC

[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13148891#comment-13148891 ] 

Keith Turner commented on ACCUMULO-140:
---------------------------------------

Would it be worthwhile adding fadvise like support to HDFS, where it can be given hints about the application plans to access a file?
                
> 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
>
> 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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