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https://issues.apache.org/jira/browse/MAPREDUCE-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204676#comment-13204676
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Steve Loughran commented on MAPREDUCE-50:
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Note that the {{DNSToSwitchMapping}} says nothing about returning null on any
problem; the behaviour of the implementation is not consistent with the javadocs
> NPE in heartbeat when the configured topology script doesn't exist
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-50
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-50
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Vinod Kumar Vavilapalli
>
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