Xuesen Liang created HADOOP-17752:
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Summary: Remove lock contention in REGISTRY of Configuration
Key: HADOOP-17752
URL: https://issues.apache.org/jira/browse/HADOOP-17752
Project: Hadoop Common
Issue Type: Improvement
Components: common
Reporter: Xuesen Liang
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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