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Posted to hdfs-issues@hadoop.apache.org by "Benoy Antony (JIRA)" <ji...@apache.org> on 2014/05/11 00:15:22 UTC

[jira] [Created] (HDFS-6363) Improve concurrency while checking inclusion and exclusion of datanodes

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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