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https://issues.apache.org/jira/browse/MAPREDUCE-5606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825590#comment-13825590
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Chris Nauroth commented on MAPREDUCE-5606:
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That config setting can be considered a permanent fix if you're not interested
in saving user history to HDFS. OTOH, if you are interested in saving user
history to HDFS, then there is no permanent fix yet. That's what this issue
tracks. :-)
> JobTracker blocked for DFSClient: Failed recovery attempt
> ---------------------------------------------------------
>
> Key: MAPREDUCE-5606
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5606
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 1.0.3
> Environment: centos 5.8 jdk 1.7
> Reporter: firegun
> Assignee: firegun
> Priority: Critical
>
> when a datanode was crash,the server can ping ok,but can not call rpc ,and
> also can not ssh login. and then jobTracker may be request a block on this
> datanode.
> it will happened ,the JobTracker can not work,the webUI is also
> unwork,hadoop job -list also unwork,the jobTracker logs no other info .
> and then we need to restart the datanode.
> then jobTraker can work too,but the taskTracker num come to zero,
> we need run : hadoop mradmin -refreshNodes
> then the JobTracker begin to add taskTraker ,but is very slowly.
> this problem occur 5time in 2weeks.
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