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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2420) improve handling of datanode timeouts
Date Thu, 03 Apr 2014 02:32:16 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze resolved HDFS-2420.
---------------------------------------

    Resolution: Not a Problem

I guess that this is not a problem anymore. Please feel free to reopen this if I am wrong.
Resolving ...

> improve handling of datanode timeouts
> -------------------------------------
>
>                 Key: HDFS-2420
>                 URL: https://issues.apache.org/jira/browse/HDFS-2420
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ron Bodkin
>
> If a datanode ever times out on a heart beat, it gets marked dead permanently. I am finding
that on AWS this is a periodic occurrence, i.e., datanodes time out although the datanode
process is still alive. The current solution to this is to kill and restart each such process
independently. 
> It would be good if there were more retry logic (e.g., blacklisting the nodes but try
heartbeats for a longer period before determining they are apparently dead). It would also
be good if refreshNodes would check and attempt to recover timed out data nodes.



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