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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2655) BlockReaderLocal#skip performs unnecessary IO
Date Thu, 16 Feb 2012 03:13:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209097#comment-13209097
] 

Hadoop QA commented on HDFS-2655:
---------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12514747/HDFS-2655.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/1873//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/1873//console

This message is automatically generated.
                
> 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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