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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374880#comment-16374880
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Hudson commented on HADOOP-9747:
--------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13707 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/13707/])
HADOOP-9747. Reduce unnecessary UGI synchronization. Contributed by (kihwal: 
rev 59cf7588779145ad5850ad63426743dfe03d8347)
* (edit) 
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUserGroupInformation.java
* (edit) 
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* (edit) 
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java
* (edit) 
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGIWithMiniKdc.java
* (edit) hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
* (edit) 
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGILoginFromKeytab.java


> Reduce unnecessary UGI synchronization
> --------------------------------------
>
>                 Key: HADOOP-9747
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9747
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>             Fix For: 3.1.0, 3.2.0, 3.0.2
>
>         Attachments: HADOOP-9747-trunk-03.patch, HADOOP-9747-trunk-04.patch, 
> HADOOP-9747-trunk.01.patch, HADOOP-9747-trunk.02.patch, 
> HADOOP-9747.2.branch-2.patch, HADOOP-9747.2.trunk.patch, 
> HADOOP-9747.branch-2.patch, HADOOP-9747.trunk.patch
>
>
> Jstacks of heavily loaded NNs show up to dozens of threads blocking in the 
> UGI.



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