Gera Shegalov created MAPREDUCE-4844:
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Summary: Counters.java doesn't obey Java Memory Model
Key: MAPREDUCE-4844
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4844
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 1.0.4
Reporter: Gera Shegalov
Counters have a number of immutable fields that have not been declared 'final'.
For example, the field groups is not final. It is, however, accessed in a
couple of methods that are declared 'synchronized'. While there is a
happens-before relationship between these methods calls, there is none between
the Counters object initialization and these synchronized methods.
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