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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-1396) map task is not re-launched when the task is failed while reducers are running with full cluster capacity - which will lead to job hang
Date Mon, 11 Nov 2013 06:30:18 GMT
Sunil G created YARN-1396:
-----------------------------

             Summary: map task is not re-launched when the task is failed while reducers are
running with full cluster capacity - which will lead to job hang
                 Key: YARN-1396
                 URL: https://issues.apache.org/jira/browse/YARN-1396
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.2.0
         Environment: SuSe Linux
            Reporter: Sunil G
            Priority: Critical


In a Cluster with 16GB capacity, job has started with 100maps and 10 reducers. 

When the reducers has started its execution, one NM has went down and resulted a failure for
2 maps. But at this time, remaining 8Gb was used by 6 reducers and AM. So there was no place
to launch the failed maps. [NM never came up again, and cluster size became 8GB]

If we kill one of reducers, then also the map cannot be launched as the priority of Failed
map is lesser than that of reducer. So the remaining reducer only will get allocated from
RM side.

This is causing a hang for in reducer side. 



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