streaming and pipes should reuse jvm's by default
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                 Key: HADOOP-4601
                 URL: https://issues.apache.org/jira/browse/HADOOP-4601
             Project: Hadoop Core
          Issue Type: Improvement
            Reporter: Doug Cutting


With HADOOP-249, tasks can now reuse JVMs.  Pipes and streaming run little user 
code in their JVMs and should generally benefit from JVM reuse.  Thus I propose 
we change the default for these to be JVM reuse.

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