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https://issues.apache.org/jira/browse/HADOOP-17752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuesen Liang updated HADOOP-17752:
----------------------------------
        Parent: HADOOP-17751
    Issue Type: Sub-task  (was: Improvement)

> 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: 10m
>  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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