Substitute the synchronized code in MD5Hash to avoid lock contention. Use
ThreadLocal instead.
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Key: HADOOP-3556
URL: https://issues.apache.org/jira/browse/HADOOP-3556
Project: Hadoop Core
Issue Type: Improvement
Reporter: Iván de Prado
Currently the MD5Hash class uses a singleton instance of the MessageDigester.
The access to this instance is synchronized, so MD5Hash has performance
problems when used from several Threads. I propose to substitute the singleton
instance by a TheadLocal instances cache. I will provide a patch.
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