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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-577) Name node doesn't always properly recognize health of data node
Date Fri, 28 Aug 2009 18:46:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748937#action_12748937
] 

Allen Wittenauer commented on HDFS-577:
---------------------------------------

We had a situation where the data node could send packets out, but packets coming in were
dropped.  So while jobs were unable to write blocks to that data node, the name node thought
it was perfectly healthy.  There should be some sort of 'double check'  to make sure the data
node is telling the truth about its health status.

> 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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