[MAPREDUCE-3598] Old combiner doesn't support counter, progress

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Duplicate
• Affects Version/s: 0.20.205.0
• Assignee: Unassigned
• Reporter: Liyin Liang
• Created: 26/Dec/11 06:04
• Updated: 26/Dec/11 08:37
• Resolved: 26/Dec/11 07:53

Description

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:

        while (values.more()) {
          combiner.reduce(values.getKey(), values, combineCollector,
              Reporter.NULL);
          values.nextKey();
        }

Issue Links

• relates to: HADOOP-5382 The new map/reduce api doesn't support combiners