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From "Liyin Liang (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3598) Old combiner doesn't support counter, progress
Date Mon, 26 Dec 2011 06:06:30 GMT
Old combiner doesn't support counter, progress
----------------------------------------------

                 Key: MAPREDUCE-3598
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3598
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.20.205.0
            Reporter: Liyin Liang
            Priority: Blocker


After HADOOP-5382, old combiner's reduce is invoked with Reporter.NULL. So all the features
in Reporter, e.g. counter, progress are not supported any more. The related code is as follows:
{code:}
        while (values.more()) {
          combiner.reduce(values.getKey(), values, combineCollector,
              Reporter.NULL);
          values.nextKey();
        }
{code}

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