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From "Milind Bhandarkar (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-403) close method in a Mapper should be provided with OutputCollector and a Reporter
Date Mon, 31 Jul 2006 22:11:13 GMT
close method in a Mapper should be provided with OutputCollector and a Reporter
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                 Key: HADOOP-403
                 URL: http://issues.apache.org/jira/browse/HADOOP-403
             Project: Hadoop
          Issue Type: Improvement
          Components: mapred
    Affects Versions: 0.5.0
         Environment: all
            Reporter: Milind Bhandarkar
         Assigned To: Milind Bhandarkar
             Fix For: 0.5.0


For mappers with side-effects, or mappers that work as aggregators (i.e. no output on individual
key-value pairs, but an aggregate output at the end of all key-value pairs), output should
be performed in the close method. For this purpose, we need to supply output collector and
reporter to the close method of Mapper. This involves interface change, though. Thoughts ?

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