JobInProgress.createCache() should not add unknown hosts to the host-to-rack
location mapping.
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Key: MAPREDUCE-1191
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1191
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Hong Tang
JobInProgress.createCache() currently would add host names specified in
rawsplits to rack "/default-rack" if it does not already know the mapping. This
seems to be a bad idea in the sense that a malicious client can submit jobs
with many maps whose locations are non-existent hosts and thus consume up
JobTracker's memory.
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