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https://issues.apache.org/jira/browse/MAPREDUCE-1740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13224093#comment-13224093
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Steve Loughran commented on MAPREDUCE-1740:
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Todd -it makes it possible to view the entire map of host -> switch. If the
tests can avoid that, its better because then they will all work on 1.x too.
> NPE in getMatchingLevelForNodes when node locations are variable depth
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-1740
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1740
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.20.3
> Reporter: Todd Lipcon
> Attachments: MAPREDUCE-1740.patch, mapreduce-1740.txt
>
>
> In getMatchingLevelForNodes, we assume that both nodes have the same "depth"
> (ie number of path components). If the user provides a topology script that
> assigns one node a path like /foo/bar/baz and another node a path like
> /foo/blah, this function will throw an NPE.
> I'm not sure if there are other places where we assume that all node
> locations have a constant number of paths. If so we should check the output
> of the topology script aggressively to be sure this is the case. Otherwise I
> think we simply need to add && n2 != null to the while loop
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