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From "Anil Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4508) YARN needs to properly check the NM,AM memory properties in yarn-site.xml and mapred.xml and report errors accordingly.
Date Thu, 02 Aug 2012 23:23:02 GMT
Anil Gupta created MAPREDUCE-4508:
-------------------------------------

             Summary: YARN needs to properly check the NM,AM memory properties in yarn-site.xml
and mapred.xml and report errors accordingly.
                 Key: MAPREDUCE-4508
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4508
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: nodemanager, resourcemanager
    Affects Versions: 2.0.0-alpha
         Environment: CentOs6.0, Hadoop2.0.0 Alpha
            Reporter: Anil Gupta


Please refer to this discussion on the Hadoop Mailing list:
http://comments.gmane.org/gmane.comp.jakarta.lucene.hadoop.user/33110

Summary:
I was running YARN(Hadoop2.0.0 Alpha) on a 8 datanode, 4 admin node Hadoop/HBase cluster.
My datanodes were only having 3.2GB of memory. So, i configured the yarn.nodemanager.resource.memory-mb
property in yarn-site.xml to 1200. After setting the property if i run any Yarn Job then the
NodemManager wont be able to start any Map task since by default the yarn.app.mapreduce.am.resource.mb
property is set to 1500 MB in mapred-site.xml. 
Expected Behavior: NodeManager should give an error if yarn.app.mapreduce.am.resource.mb >=
yarn.nodemanager.resource.memory-mb.

Please let me know if more information is required.

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