Streaming combiner should allow command, not just JavaClass
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Key: HADOOP-4842
URL: https://issues.apache.org/jira/browse/HADOOP-4842
Project: Hadoop Core
Issue Type: Improvement
Components: contrib/streaming
Reporter: Marco Nicosia
Streaming jobs are way slower than Java jobs for many reasons, but certainly
stopping the shell-only programmer from using the combiner feature won't help.
Right now, the streaming usage says:
{quote}
-mapper <cmd|JavaClassName> The streaming command to run
-combiner <JavaClassName> Combiner has to be a Java class
-reducer <cmd|JavaClassName> The streaming command to run
{quote}
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