Benoy Antony created HDFS-6363:
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             Summary: Improve concurrency while checking inclusion and 
exclusion of datanodes
                 Key: HDFS-6363
                 URL: https://issues.apache.org/jira/browse/HDFS-6363
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Benoy Antony
            Assignee: Benoy Antony
         Attachments: HDFS-6363.patch

HostFileManager holds two effectively immutable objects - includes and 
excludes. These two objects can be safely published together using a volatile 
container instead of synchronizing for all mutators and accessors.
This improves the concurrency while using HostFileManager.




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