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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-457) better handling of volume failure in Data Node storage
Date Sat, 15 Aug 2009 08:53:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743613#action_12743613
] 

Hadoop QA commented on HDFS-457:
--------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12416633/HDFS-457-2.patch
  against trunk revision 804127.

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

    +1 tests included.  The patch appears to include 7 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 findbugs.  The patch does not introduce any new Findbugs warnings.

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

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-vesta.apache.org/69/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-vesta.apache.org/69/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-vesta.apache.org/69/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-vesta.apache.org/69/console

This message is automatically generated.

> better handling of volume failure in Data Node storage
> ------------------------------------------------------
>
>                 Key: HDFS-457
>                 URL: https://issues.apache.org/jira/browse/HDFS-457
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>         Attachments: HDFS-457-1.patch, HDFS-457-2.patch, HDFS-457-2.patch, HDFS-457-2.patch,
HDFS-457.patch, TestFsck.zip
>
>
> Current implementation shuts DataNode down completely when one of the configured volumes
of the storage fails.
> This is rather wasteful behavior because it  decreases utilization (good storage becomes
unavailable) and imposes extra load on the system (replication of the blocks from the good
volumes). These problems will become even more prominent when we move to mixed (heterogeneous)
clusters with many more volumes per Data Node.

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