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Date: Sat, 8 Oct 2011 13:50:29 +0000 (UTC)
From: "Ron Bodkin (Created) (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-2420) improve handling of datanode timeouts
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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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