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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2157) tasklauncher threads in TaskTracker can die because of unexpected interrupts
Date Tue, 26 Oct 2010 18:22:21 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925074#action_12925074
] 

Devaraj Das commented on MAPREDUCE-2157:
----------------------------------------

bq. It seems that the interrupted condition can be set by log4j (of which there are many calls
inside TaskLauncher)

Really? Do you have a scenario of the execution inside the AsyncAppender that could lead to
this?

> tasklauncher threads in TaskTracker can die because of unexpected interrupts
> ----------------------------------------------------------------------------
>
>                 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
>
> 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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