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https://issues.apache.org/jira/browse/MAPREDUCE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199802#comment-13199802
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Robert Joseph Evans commented on MAPREDUCE-3759:
------------------------------------------------

It looks like Oracle finally turned off the old javadoc package list API. and 
we are all hitting http://jira.codehaus.org/browse/MJAVADOC-300 which is 
causing your one javadoc warning.  I will file a JIRA to update this.
                
> ClassCastException thrown in -list-active-trackers when there are a few 
> unhealthy nodes
> ---------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3759
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3759
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Ramya Sunil
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3759-20120202.txt
>
>
> When there are a few blacklisted nodes in the cluster, "bin/mapred job 
> -list-active-trackers" throws "java.lang.ClassCastException: 
> org.apache.hadoop.yarn.server.resourcemanager.resource.Resources$1 cannot be 
> cast to org.apache.hadoop.yarn.api.records.impl.pb.ResourcePBImpl"

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