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Date: Wed, 13 Jun 2012 00:25:43 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3228) Use fadvise in local read path
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    [ https://issues.apache.org/jira/browse/HDFS-3228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294020#comment-13294020 ] 

Hudson commented on HDFS-3228:
------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #2373 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2373/])
    Amendment to my previous commit, fixing JIRA in CHANGES.txt from HDFS-3228 to HDFS-3428 (Revision 1349556)

     Result = FAILURE
tucu : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1349556
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

                
> Use fadvise in local read path
> ------------------------------
>
>                 Key: HDFS-3228
>                 URL: https://issues.apache.org/jira/browse/HDFS-3228
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client, performance
>            Reporter: Henry Robinson
>            Assignee: Henry Robinson
>
> The read path through BlockReaderLocal does not take advantage of readahead or drop-behind in the way that BlockSender does. We could arguably stand to gain even more from hinting about read patterns to the kernel here, so we should add the same mechanisms to BlockReaderLocal. 

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