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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5606) JobTracker blocked for DFSClient: Failed recovery attempt
Date Mon, 18 Nov 2013 18:37:23 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825590#comment-13825590
] 

Chris Nauroth commented on MAPREDUCE-5606:
------------------------------------------

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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