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https://issues.apache.org/jira/browse/HDFS-577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748938#action_12748938
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Allen Wittenauer commented on HDFS-577:
---------------------------------------

(FWIW, I haven't had a chance to see if this issue impacts the job/task 
trackers, so in HDFS this bug goes for now...)

> Name node doesn't always properly recognize health of data node
> ---------------------------------------------------------------
>
>                 Key: HDFS-577
>                 URL: https://issues.apache.org/jira/browse/HDFS-577
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Allen Wittenauer
>
> The one-way communication (data node -> name node) for node health does not 
> guarantee that the data node is actually healthy.

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