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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2744) Extend FSDataInputStream to allow fadvise
Date Tue, 03 Jan 2012 21:48:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179049#comment-13179049
] 

Suresh Srinivas commented on HDFS-2744:
---------------------------------------

+1.

Should we add some interface called FAdvisable and then provide default implementation in
FSInputStream and FSOutputStream (that is advise is ignored). The real implementation could
be provided in DFS classes.
                
> Extend FSDataInputStream to allow fadvise
> -----------------------------------------
>
>                 Key: HDFS-2744
>                 URL: https://issues.apache.org/jira/browse/HDFS-2744
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> Now that we have direct reads from local HDFS block files (HDFS-2246), it might make
sense to make FSDataInputStream support fadvise calls. I have an application (HBase) that
would like to tell the OS that it should not buffer data in the OS buffer cache.

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