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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10173) Remove UGI from DIGEST-MD5 SASL server creation
Date Tue, 17 Dec 2013 19:26:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850808#comment-13850808
] 

Daryn Sharp commented on HADOOP-10173:
--------------------------------------

This jira will accelerate token auth, but not kerberos auth.  HADOOP-10174 should eventually
supersede this jira and accelerate both.

> 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
>
> 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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