NPE in getMatchingLevelForNodes when node locations are variable depth
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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, 0.21.0, 0.22.0
Reporter: Todd Lipcon
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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