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From "Zhizhen Hou (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-7187) RMContainerAllocator.ScheduledRequests#getContainerReqToReplace may not find a task when the priority of container is PRIORITY_MAP
Date Thu, 28 Feb 2019 08:55:00 GMT
Zhizhen Hou created MAPREDUCE-7187:
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             Summary: RMContainerAllocator.ScheduledRequests#getContainerReqToReplace may
not find a task when the priority of container is PRIORITY_MAP
                 Key: MAPREDUCE-7187
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7187
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: applicationmaster
    Affects Versions: 2.7.5
            Reporter: Zhizhen Hou


The resource manager may has allocated a map container on a host ("h1" for example) for a
application, and the container has not been fetched by the MRAppMaster. At this time, the 
MRAppMaster receives a task fail event, and the task is on host h1. The event cause the h1
blacklisted. Now the MRAppMaster send a heartbeat, and receive a container on h1. The MRAppMaster
can not assign the container since it is on a blacklisted host. The #getContainerReqToReplace
fails returning  another task, may cause a map task hang forever.



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