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https://issues.apache.org/jira/browse/HDFS-1653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999492#comment-12999492
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Suresh Srinivas commented on HDFS-1653:
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+1 for the patch.
> Block received is sent with invalid DatanodeRegistration
> ----------------------------------------------------------
>
> Key: HDFS-1653
> URL: https://issues.apache.org/jira/browse/HDFS-1653
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: Federation Branch
> Reporter: Tanping Wang
> Assignee: Tanping Wang
> Fix For: Federation Branch
>
> Attachments: HDFS-1653.patch
>
>
> When sending block received bpRegistration should be used. Also when
> datanode shutsdown, if there are no namenode threads created, a null pointer
> exception is thrown.
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