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https://issues.apache.org/jira/browse/HADOOP-17752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17366340#comment-17366340
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Xuesen Liang commented on HADOOP-17752:
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Gently ping [~omalley], could you kindly review this issue about Configuration?
thanks.
> Remove lock contention in REGISTRY of Configuration
> ---------------------------------------------------
>
> Key: HADOOP-17752
> URL: https://issues.apache.org/jira/browse/HADOOP-17752
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: common
> Reporter: Xuesen Liang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Every Configuration instance is put into *Configuration#REGISTRY* by its
> constructor. This operation is guard by Configuration.class.
> REGISTRY is a *WeakHashMap*, which should be replaced by *ConcurrentHashMap*.
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