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From "Plamen Jeliazkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5077) NPE in FSNamesystem.commitBlockSynchronization()
Date Wed, 28 Aug 2013 06:23:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752150#comment-13752150
] 

Plamen Jeliazkov commented on HDFS-5077:
----------------------------------------

Good point, thanks Konstantin.

I was basically mimic'ing the logic of testCommitSyncWithClose but with a non-existant DatanodeID
so I keep the logic close to the test above it.
It does indeed appear to be un-necessary; I'll modify the test.

Also I don't think the TestPread issue appears to be related. Ran the tests locally and passed.
                
> NPE in FSNamesystem.commitBlockSynchronization()
> ------------------------------------------------
>
>                 Key: HDFS-5077
>                 URL: https://issues.apache.org/jira/browse/HDFS-5077
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.5-alpha
>            Reporter: Konstantin Shvachko
>            Assignee: Plamen Jeliazkov
>         Attachments: HDFS-5077_2.patch, HDFS-5077.patch
>
>
> NN starts a block recovery, which will synchronize block replicas on different DNs. In
the end one of DNs will report the list of the nodes containing the consistent replicas to
the NN via commitBlockSynchronization() call. The NPE happens if just before processing commitBlockSynchronization()
NN removes from active one of DNs that are then reported in the call.

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