Benoy Antony created HADOOP-10594:
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             Summary: Improve Concurrency in Groups
                 Key: HADOOP-10594
                 URL: https://issues.apache.org/jira/browse/HADOOP-10594
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Benoy Antony
            Assignee: Benoy Antony
         Attachments: HADOOP-10594.patch

The static field GROUPS in Groups can be accessed by holding a lock only.
This object is effectively immutable after construction and hence can safely 
published using a volatile field. This enables threads to access this GROUPS 
object without holding lock



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