Brian Loss created HADOOP-10934:
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Summary: AbstractCounters.readFields doesn't clear "other" groups
Key: HADOOP-10934
URL: https://issues.apache.org/jira/browse/HADOOP-10934
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 2.4.1, 2.4.0, 2.3.0, 2.2.0
Reporter: Brian Loss
The readFields method of AbstractCounters clears the "framework and fs groups"
map {{fgroups}}, but does not clear the "other groups" map {{groups}}. If a
Counters object is used as the key or value record reader, it will aggregate
groups over all records rather than just returning the counters for the current
record. In all likelihood, in addition to providing incorrect data, the
counter limit will also be exceeded as it is checked each time through
readFields.
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