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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1431) Map tasks can't timeout for failing to call progress
Date Fri, 01 Jun 2007 18:27:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500800
] 

Doug Cutting commented on HADOOP-1431:
--------------------------------------

So, to be conservative, let's get rid of the join and just go with interrupt.  Thus, the method
should look something like:

{code}
private void sortWithProgress() {
   Thread progress = createProgressThread(umbilical);
   try {
     sortAndSpillToDisk();
   } finally {
      progress.interrupt();
   }
}
{code}

We need not define a nested class, we can re-use the existing createProgressThread() method
without alteration.  Does that sound good?

> Map tasks can't timeout for failing to call progress
> ----------------------------------------------------
>
>                 Key: HADOOP-1431
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1431
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.13.0
>            Reporter: Owen O'Malley
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.13.0
>
>         Attachments: HADOOP-1431_1_20070525.patch, HADOOP-1431_2_20070530.patch, HADOOP-1431_3_20070601.patch
>
>
> Currently the map task runner creates a thread that calls progress every second to keep
the system from killing the map if the sort takes too long. This is the wrong approach, because
it will cause stuck tasks to not be killed. The right solution is to have the sort call progress
as it actually makes progress. This is part of what is going on in HADOOP-1374. A map gets
stuck at 100% progress, but not done.

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