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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2182) Exceptions in DataXceiver#run can result in a zombie datanode
Date Thu, 21 Jul 2011 20:14:58 GMT
Exceptions in DataXceiver#run can result in a zombie datanode 
--------------------------------------------------------------

                 Key: HDFS-2182
                 URL: https://issues.apache.org/jira/browse/HDFS-2182
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
            Reporter: Eli Collins
             Fix For: 0.23.0


DataXceiver#run currently swallows all exceptions, it should instead plumb them up to DataXceiverServer#run
so it can decide whether the exception should be tolerated or the daemon should exit. An IOE
should be tolerated (because it's likely just an issue with a particular thread, or an intermittent
failure), as it is today, but eg j.l.Error should be not. 

This came up in the following bug I'm seeing on a test cluster: if there's eg a NoClassDefFoundError
thrown in DataXceiver#run (because the host jars were replaced out from underneath it, it
ran out of descriptors, etc.) we'll end up with a datanode that is alive but always fails
because it can't create any DataXceiver threads. In this case the datanode should shut itself
down rather than continue to run.

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