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Posted to common-issues@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2015/03/17 19:53:38 UTC

[jira] [Created] (HADOOP-11725) Minor cleanup of BlockPoolManager#getAllNamenodeThreads

Arpit Agarwal created HADOOP-11725:
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             Summary: Minor cleanup of BlockPoolManager#getAllNamenodeThreads
                 Key: HADOOP-11725
                 URL: https://issues.apache.org/jira/browse/HADOOP-11725
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Arpit Agarwal
            Assignee: Arpit Agarwal
            Priority: Minor


{{BlockPoolManager#getAllNamenodeThreads}} can avoid unnecessary list to array conversion and vice versa by returning an UnmodifiableList. Since NN addition/removal is relatively rare we can just use a CopyOnWriteArrayList for concurrency.



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