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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2655) BlockReaderLocal#skip performs unnecessary IO
Date Fri, 17 Feb 2012 13:55:59 GMT

    [ 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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