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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3931) TestDatanodeBlockScanner#testBlockCorruptionPolicy2 is broken
Date Wed, 19 Sep 2012 03:43:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458387#comment-13458387
] 

Hadoop QA commented on HDFS-3931:
---------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12545650/hdfs3931-1.txt
  against trunk revision .

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

    +1 tests included.  The patch appears to include 2 new or modified test files.

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

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

    +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 hadoop-hdfs-project/hadoop-hdfs.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3206//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3206//console

This message is automatically generated.
                
> TestDatanodeBlockScanner#testBlockCorruptionPolicy2 is broken
> -------------------------------------------------------------
>
>                 Key: HDFS-3931
>                 URL: https://issues.apache.org/jira/browse/HDFS-3931
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Andy Isaacson
>         Attachments: hdfs3931-1.txt, hdfs3931.txt
>
>
> Per Andy's comment on HDFS-3902:
> TestDatanodeBlockScanner still fails about 1/5 runs in testBlockCorruptionRecoveryPolicy2.
That's due to a separate test issue also uncovered by HDFS-3828.
> The failure scenario for this one is a bit more tricky. I think I've captured the scenario
below:
> - The test corrupts 2/3 replicas.
> - client reports a bad block.
> - NN asks a DN to re-replicate, and randomly picks the other corrupt replica.
> - DN notices the incoming replica is corrupt and reports it as a bad block, but does
not inform the NN that re-replication failed.
> - NN keeps the block on pendingReplications.
> - BP scanner wakes up on both DNs with corrupt blocks, both report corruption. NN reports
both as duplicates, one from the client and one from the DN report above.
> since block is on pendingReplications, NN does not schedule another replication.

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