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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-165) NPE in datanode.handshake()
Date Tue, 26 Jan 2010 19:58:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805162#action_12805162
] 

Steve Loughran commented on HDFS-165:
-------------------------------------

OK, if that's the case then its only possible to recreate this condition with my Service lifecycle
-in which case it should go into that patch- or if someone has subclassed the datanode and
has somehow started a thread while the super() class is starting up. I will merge it into
the lifecycle patch rather than split out (as I have done here)

> NPE in datanode.handshake()
> ---------------------------
>
>                 Key: HDFS-165
>                 URL: https://issues.apache.org/jira/browse/HDFS-165
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.20.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: HDFS-165.patch
>
>
> It appears possible to raise an NPE in DataNode.handshake() if the startup protocol gets
interrupted or fails in some manner

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