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