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Date: Fri, 17 Feb 2012 13:55:59 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2655) BlockReaderLocal#skip performs
 unnecessary IO
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    [ https://issues.apache.org/jira/browse/HDFS-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210266#comment-13210266 ] 

Hudson commented on HDFS-2655:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #993 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/993/])
    HDFS-2655. BlockReaderLocal#skip performs unnecessary IO. Contributed by Brandon Li. (Revision 1245118)

     Result = SUCCESS
jitendra : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1245118
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockReaderLocal.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java

                
> BlockReaderLocal#skip performs unnecessary IO
> ---------------------------------------------
>
>                 Key: HDFS-2655
>                 URL: https://issues.apache.org/jira/browse/HDFS-2655
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.24.0, 0.23.1
>            Reporter: Eli Collins
>            Assignee: Brandon Li
>         Attachments: HDFS-2655.txt, HDFS-2655.txt
>
>
> Per HDFS-2654 BlockReaderLocal#skip performs the skip by reading the data so we stay in sync with checksums. This could be implemented more efficiently in the future to skip to the beginning of the appropriate checksum chunk and then only read to the middle of that chunk.

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