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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