add stdin to mapdebug and reducedebug scripts in streaming
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                 Key: MAPREDUCE-2712
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2712
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: contrib/streaming
    Affects Versions: 0.20.2
            Reporter: Antonio Piccolboni


The current syntax for the mapdebug and reducedebug scripts is $script $stdout 
$stderr $syslog $jobconf, which seems appropriate for task failure 
post-analysis. But it seems more than natural to want to inspect or analyze the 
input to see under what input the task failed, up to rerunning the task say in 
debug mode or with other monitoring in place. So why not make it $script $stdin 
$stdout $stderr $syslog $jobconf to complete the circle? See also 
https://issues.apache.org/jira/browse/MAPREDUCE-2076

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