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