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https://issues.apache.org/jira/browse/HDFS-7944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arpit Agarwal updated HDFS-7944:
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Issue Type: Improvement (was: Bug)
> Minor cleanup of BlockPoolManager#getAllNamenodeThreads
> -------------------------------------------------------
>
> Key: HDFS-7944
> URL: https://issues.apache.org/jira/browse/HDFS-7944
> Project: Hadoop HDFS
> Issue Type: Improvement
> 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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