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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2420) improve handling of datanode timeouts
Date Sun, 09 Oct 2011 22:15:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123793#comment-13123793
] 

Suresh Srinivas commented on HDFS-2420:
---------------------------------------

Can you please add Affects Versions field in the jira.

Default keep alive timeout is 600 seconds. That is a long time given default heart beat timeout
is 3s. Also the datanode does keep retrying to connect to namenode. So I am not sure about
the issue you have reported here. Can you upload logs for the scenario in this bug.
                
> 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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