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https://issues.apache.org/jira/browse/HDFS-577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749416#action_12749416
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dhruba borthakur commented on HDFS-577:
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Do you have a proposal on how this can be detected? What would be the scenario
when there is a network partition whereby some cluster nodes can write to a
datanode while many other cluster nodes cannot write to this datanode, would
you still want it to be flagged?
> 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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