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https://issues.apache.org/jira/browse/HDFS-885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798182#action_12798182
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Konstantin Boudnik commented on HDFS-885:
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+1 looks good
> Datanode toString() NPEs on null dnRegistration
> -----------------------------------------------
>
> Key: HDFS-885
> URL: https://issues.apache.org/jira/browse/HDFS-885
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.22.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 0.22.0
>
> Attachments: HDFS-885.patch
>
>
> {{Datanode toString() }} assumes the {{dnRegistration}} value is never null.
> This is not always true, and when it is not the case, the {{toString()}}
> operator NPEs.
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