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Posted to mapreduce-dev@hadoop.apache.org by "Robert Joseph Evans (JIRA)" <ji...@apache.org> on 2012/07/18 23:49:35 UTC

[jira] [Created] (MAPREDUCE-4458) Warn in java.library.path is used

Robert Joseph Evans created MAPREDUCE-4458:
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             Summary: Warn in java.library.path is used
                 Key: MAPREDUCE-4458
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4458
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
    Affects Versions: 0.23.3, 3.0.0, 2.2.0-alpha
            Reporter: Robert Joseph Evans
            Assignee: Robert Joseph Evans


If java.library.path is used on the command line for launching an MRAppMaster or an MR Task, it could conflict with how standard Hadoop/HDFS JNI libraries and dependencies are found.  At a minimum the client should output a warning and ask the user to switch to LD_LIBRARY_PATH.  It would be nice to automatically do this for them but parsing the command line is scary so just a warning is probably good enough for now.

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