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https://issues.apache.org/jira/browse/MAPREDUCE-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Liyin Liang resolved MAPREDUCE-3619.
------------------------------------
Resolution: Duplicate
> Change streaming code to use new mapreduce api.
> -----------------------------------------------
>
> Key: MAPREDUCE-3619
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3619
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/streaming, mrv2
> Affects Versions: 0.23.1
> Reporter: Liyin Liang
>
> If we run a streaming job with following python script as mapper or reducer,
> the job will throws NullPointerException.
> {code:}
> #!/usr/bin/python
> import sys,os
> class MyTask:
> def __init__(self, file=sys.stdin):
> self.file = file
> print >>sys.stderr, "reporter:counter:spam,disp_flag_record,0"
> print >>sys.stderr, "reporter:counter:spam,spam_record,0"
> def process(self):
> while True:
> line = self.file.readline()
> if not line:
> break;
> print line
> if __name__ == "__main__":
> task = MyTask()
> task.process()
> {code}
> Here is the NPE related log:
> 2011-12-22 14:14:06,310 WARN org.apache.hadoop.streaming.PipeMapRed:
> java.lang.NullPointerException
> at
> org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.incrCounter(PipeMapRed.java:502)
> at
> org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.run(PipeMapRed.java:444)
> This is because the above script's "print >>sys.stderr" will invoke
> reporter.incrCounter() during PipeMapper|PipeReducer.configure(). While we
> can not get reporter in configure() function.
> To fix this problem, we should change streaming code to use new-api. Then we
> can call context.getCounter() in Mapper|Reducer.setup() function.
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