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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10755) Support negative caching of user-group mapping
Date Tue, 22 Jul 2014 11:02:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070116#comment-14070116
] 

Hudson commented on HADOOP-10755:
---------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #620 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/620/])
HADOOP-10755. Support negative caching of user-group mapping. Contributed by Lei Xu. (wang:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1612408)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/Groups.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/LdapGroupsMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ShellBasedUnixGroupsMapping.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Timer.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/FakeTimer.java


> Support negative caching of user-group mapping
> ----------------------------------------------
>
>                 Key: HADOOP-10755
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10755
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.2.0
>            Reporter: Andrew Wang
>            Assignee: Lei (Eddy) Xu
>             Fix For: 2.6.0
>
>         Attachments: HADOOP-10755.000.patch, HADOOP-10755.001.patch, HADOOP-10755.002.patch,
HADOOP-10755.003.patch, HADOOP-10755.004.patch, HDFS-5369.000.patch
>
>
> We've seen a situation at a couple of our customers where interactions from an unknown
user leads to a high-rate of group mapping calls. In one case, this was happening at a rate
of 450 calls per second with the shell-based group mapping, enough to severely impact overall
namenode performance and also leading to large amounts of log spam (prints a stack trace each
time).
> Let's consider negative caching of group mapping, as well as quashing the rate of this
log message.



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