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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1850) DN should transmit absolute failed volume count rather than increments to the NN
Date Tue, 03 May 2011 00:38:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027963#comment-13027963
] 

Hadoop QA commented on HDFS-1850:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12478000/hdfs-1850-7.patch
  against trunk revision 1098781.

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

    +1 tests included.  The patch appears to include 38 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 (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 failed these core unit tests:
                  org.apache.hadoop.hdfs.server.namenode.TestBackupNode
                  org.apache.hadoop.hdfs.TestDFSStorageStateRecovery
                  org.apache.hadoop.hdfs.TestFileConcurrentReader

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

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/444//testReport/
Findbugs warnings: https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/444//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/444//console

This message is automatically generated.

> DN should transmit absolute failed volume count rather than increments to the NN
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-1850
>                 URL: https://issues.apache.org/jira/browse/HDFS-1850
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, name-node
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1850-1.patch, hdfs-1850-2.patch, hdfs-1850-3.patch, hdfs-1850-4.patch,
hdfs-1850-5.patch, hdfs-1850-6.patch, hdfs-1850-7.patch
>
>
> The API added in HDFS-811 for the DN to report volume failures to the NN is "inc(DN)".
However the given sequence of events will result in the NN forgetting about reported failed
volumes:
> # DN loses a volume and reports it
> # NN restarts
> # DN re-registers to the new NN
> A more robust interface would be to have the DN report the total number of volume failures
to the NN each heart beat (the same way other volume state is transmitted).
> This will likely be an incompatible change since it requires changing the Datanode protocol.

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