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From Iván de Prado (JIRA) <j...@apache.org>
Subject [jira] Created: (HADOOP-3556) Substitute the synchronized code in MD5Hash to avoid lock contention. Use ThreadLocal instead.
Date Fri, 13 Jun 2008 15:40:44 GMT
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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