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From "dhruba borthakur (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2744) Extend FSDataInputStream to allow fadvise
Date Tue, 03 Jan 2012 20:56:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179012#comment-13179012
] 

dhruba borthakur commented on HDFS-2744:
----------------------------------------

{code}
  /**
   * Tells the system to not buffer data in the OS buffer cache if
   * appropriate.
   *
   * @param mode random, sequential, normal, dontneed
   * @param offset the starting file offset of the file
   * @param size the size of data that need not be cached
   */
  public void fadvise(Enum mode, long position, int length)
    throws IOException

{code}

                
> 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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