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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2157) safely handle InterruptedException and interrupted status in MR code
Date Tue, 02 Nov 2010 22:34:28 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joydeep Sen Sarma updated MAPREDUCE-2157:
-----------------------------------------

    Attachment: mapreduce-2157.1.patch

> safely handle InterruptedException and interrupted status in MR code
> --------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2157
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2157
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Joydeep Sen Sarma
>            Assignee: Joydeep Sen Sarma
>            Priority: Critical
>         Attachments: mapreduce-2157.1.patch
>
>
> taskLauncher thread exits on interruptedException and on Interrupt conditions without
checking for any shutdown flag:
>      while (!Thread.interrupted()) {
>         ...
>         } catch (InterruptedException e) { 
>           return; // ALL DONE                                                       
                                                              
>         }
>      }
> If the interrupt happened because of reasons other than TaskTracker.close() - then the
TaskTracker will look functional - but will not be able to schedule tasks anymore. worse -
some tasks (that are in the launch queue) will hang indefinitely un UNASSIGNED state (the
JobTracker will not even time them out). We have seen this cause jobs to hang indefinitely.
> It seems that the interrupted condition can be set by log4j (of which there are many
calls inside TaskLauncher). See or instance: http://logging.apache.org/log4j/1.2/xref/org/apache/log4j/AsyncAppender.html

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