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From "Ivan Mitic (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5512) TaskTracker hung after failed reconnect to the JobTracker
Date Fri, 11 Oct 2013 05:31:42 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792356#comment-13792356
] 

Ivan Mitic commented on MAPREDUCE-5512:
---------------------------------------

Thanks Chris for the review, will commit the patch shortly.

> TaskTracker hung after failed reconnect to the JobTracker
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-5512
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5512
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 1.3.0
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>         Attachments: hadoop-tasktracker-RD00155DD09100.log, MAPREDUCE-5512.branch-1.patch,
tt_Hung.txt
>
>
> TaskTracker hung after failed reconnect to the JobTracker. 
> This is the problematic piece of code:
> {code}
>     this.distributedCacheManager = new TrackerDistributedCacheManager(
>         this.fConf, taskController);
>     this.distributedCacheManager.startCleanupThread();
>     
>     this.jobClient = (InterTrackerProtocol) 
>     UserGroupInformation.getLoginUser().doAs(
>         new PrivilegedExceptionAction<Object>() {
>       public Object run() throws IOException {
>         return RPC.waitForProxy(InterTrackerProtocol.class,
>             InterTrackerProtocol.versionID,
>             jobTrackAddr, fConf);
>       }
>     });
> {code}
> In case RPC.waitForProxy() throws, TrackerDistributedCacheManager cleanup thread will
never be stopped, and given that it is a non daemon thread it will keep TT up forever.



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