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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2182) Exceptions in DataXceiver#run can result in a zombie datanode
Date Thu, 21 Jul 2011 21:24:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13069220#comment-13069220
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Eli Collins commented on HDFS-2182:
-----------------------------------

Ah, yea, it's calling start(), not run(). DataXceiver has a reference do datanode, so it can
just set shouldRun to false in the case of a non-IOE. Much simpler. 

> 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
>
>         Attachments: hdfs-2182-1.patch
>
>
> 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 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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