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https://issues.apache.org/jira/browse/HDFS-4840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670528#comment-13670528
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Jing Zhao commented on HDFS-4840:
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Thanks Kihwal! +1 for the patch.
> ReplicationMonitor gets NPE during shutdown
> -------------------------------------------
>
> Key: HDFS-4840
> URL: https://issues.apache.org/jira/browse/HDFS-4840
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0, 2.0.5-beta
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Attachments: HDFS-4840.patch.txt
>
>
> TestBlocksWithNotEnoughRacks occasionally fails during test tear down because
> RaplicationMonitor gets NPE.
> Seen at https://builds.apache.org/job/Hadoop-Hdfs-trunk/1406/.
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