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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-133) the TaskTracker.Child.ping thread calls exit
Date Thu, 13 Apr 2006 23:18:00 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-133?page=comments#action_12374433 ] 

Owen O'Malley commented on HADOOP-133:
--------------------------------------

I've been assuming that the "Child died with nonzero exit status" with no other error messages
is coming from the failure of a ping. I will change that message to include the actual exit
status and change the ping-failure exit code to 123 or something.

> the TaskTracker.Child.ping thread calls exit
> --------------------------------------------
>
>          Key: HADOOP-133
>          URL: http://issues.apache.org/jira/browse/HADOOP-133
>      Project: Hadoop
>         Type: Bug

>   Components: mapred
>     Versions: 0.1.1
>     Reporter: Owen O'Malley
>     Assignee: Owen O'Malley

>
> The TaskTracker.Child.startPinging thread calls exit if the TaskTracker doesn't respond.
Calling exit in a mutli-threaded program is really problematic. In particular, it prevents
cleanup/finally clauses from running. We need to move to a model where it uses Thread.interrupt(),
which means we need to check the interrupt flag in place in the map loop and reduce loop and
stop masking the InterruptExceptions.

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