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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1191) JobInProgress.createCache() should not add unknown hosts to the host-to-rack location mapping.
Date Fri, 06 Nov 2009 01:54:32 GMT
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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