Old combiner doesn't support counter, progress
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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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