Xuesen Liang created HADOOP-17757:
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Summary: Reduce lock contention in properties of Configuration
Key: HADOOP-17757
URL: https://issues.apache.org/jira/browse/HADOOP-17757
Project: Hadoop Common
Issue Type: Improvement
Components: common
Reporter: Xuesen Liang
The *properties* field of class *Configuration* is guard by _synchronized_, and
its type java.util.Property is a sub class of java.util.*Hashtable*, which
methods are all synchronized. These are bad for multithread performance.
The properties field should be replaced by a *HashMap<String, String>* with a
*ReentrantReadWriteLock*, then all _get()_ related operations can be parallel
guard by ReadLock, and _set/load_ operations can be guard by WriteLock. This is
better for performance.
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