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https://issues.apache.org/jira/browse/HADOOP-10172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13854036#comment-13854036
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Hudson commented on HADOOP-10172:
---------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk #427 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/427/])
HADOOP-10172. Cache SASL server factories (daryn) (daryn:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1552389)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcServer.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java
> Cache SASL server factories
> ---------------------------
>
> Key: HADOOP-10172
> URL: https://issues.apache.org/jira/browse/HADOOP-10172
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Fix For: 3.0.0, 2.4.0
>
> Attachments: HADOOP-10172.patch
>
>
> Performance for SASL server creation is _atrocious_.
> {{Sasl.createSaslServer}} does not cache the provider resolution for the
> factories. Factory resolution and server instantiation has 3 major
> contention points. During bursts of connections, one reader accepting a
> connection stalls other readers accepting connections, in turn stalling all
> existing connections handled by those readers.
> I benched 5 threads at 187 instances/s - total, not per thread. With this
> and another change, I've boosted it to 33K instances/s.
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