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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Moved] (YARN-1680) Reducer preemption does not happen if node is blacklisted, intern job get hanged.
Date Fri, 31 Jan 2014 10:30:08 GMT

     [ https://issues.apache.org/jira/browse/YARN-1680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rohith moved MAPREDUCE-5734 to YARN-1680:
-----------------------------------------

    Affects Version/s:     (was: 2.2.0)
                       2.3.0
                       2.2.0
                  Key: YARN-1680  (was: MAPREDUCE-5734)
              Project: Hadoop YARN  (was: Hadoop Map/Reduce)

> Reducer preemption does not  happen if node is blacklisted, intern job get hanged.
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-1680
>                 URL: https://issues.apache.org/jira/browse/YARN-1680
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.2.0, 2.3.0
>         Environment: SuSE 11 SP2 + Hadoop-2.3 
>            Reporter: Rohith
>
> There are 4 NodeManagers with 8GB each.Total cluster capacity is 32GB.Cluster slow start
is set to 1.
> Job is running reducer task occupied 29GB of cluster.One NodeManager(NM-4) is become
unstable(3 Map got killed), MRAppMaster blacklisted unstable NodeManager(NM-4). All reducer
task are running in cluster now.
> MRAppMaster does not preempt the reducers because for Reducer preemption calculation,
headRoom is considering blacklisted nodes memory. This makes jobs to hang forever(ResourceManager
does not assing any new containers on blacklisted nodes but returns availableResouce considers
cluster free memory). 



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