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https://issues.apache.org/jira/browse/HADOOP-3556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605291#action_12605291
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Iván de Prado commented on HADOOP-3556:
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I have changed the status to "Resume Progress", then I attached a new patch
with some more unit tests, but I can not find the link for changing to status
"Submit Patch". Could you help me with that?
> Substitute the synchronized code in MD5Hash to avoid lock contention. Use
> ThreadLocal instead.
> ----------------------------------------------------------------------------------------------
>
> Key: HADOOP-3556
> URL: https://issues.apache.org/jira/browse/HADOOP-3556
> Project: Hadoop Core
> Issue Type: Improvement
> Reporter: Iván de Prado
> Attachments: 3556.patch, MD5Hash-ThreadLocal.patch
>
>
> 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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