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https://issues.apache.org/jira/browse/HADOOP-10173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13860237#comment-13860237
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Kihwal Lee commented on HADOOP-10173:
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+1 Looks straightforward.
> Remove UGI from DIGEST-MD5 SASL server creation
> -----------------------------------------------
>
> Key: HADOOP-10173
> URL: https://issues.apache.org/jira/browse/HADOOP-10173
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.23.0, 3.0.0, 2.4.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HADOOP-10173.patch
>
>
> Instantiation of SASL server instances within the readers threads is
> performed within a {{UGI.getCurrentUser().doAs}}. {{getCurrentUser}} is
> synchronized, and doAs also degrades performance. GSSAPI (kerberos) requires
> instantiation within a doAs, but DIGEST-MD5 (token) does not.
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