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Hudson commented on HADOOP-8088:
--------------------------------
Integrated in Hadoop-Common-trunk-Commit #1897 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1897/])
HADOOP-8088. User-group mapping cache incorrectly does negative caching on transient failures
(Khiwal Lee via bobby) (Revision 1302062)
Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1302062
Files :
* /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/Groups.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
> User-group mapping cache incorrectly does negative caching on transient failures
> --------------------------------------------------------------------------------
>
> Key: HADOOP-8088
> URL: https://issues.apache.org/jira/browse/HADOOP-8088
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 0.20.205.0, 0.24.0, 0.23.1, 1.0.0, 1.1.0
> Reporter: Kihwal Lee
> Fix For: 0.24.0, 1.1.0, 0.23.2
>
> Attachments: hadoop-8088-branch-1.patch, hadoop-8088-branch-1.patch, hadoop-8088-trunk.patch,
hadoop-8088-trunk.patch, hadoop-8088-trunk.patch
>
>
> We've seen a case where some getGroups() calls fail when the ldap server or the network
is having transient failures. Looking at the code, the shell-based and the JNI-based implementations
swallow exceptions and return an empty or partial list. The caller, Groups#getGroups() adds
this likely empty list into the mapping cache for the user. This will function as negative
caching until the cache expires. I don't think we want negative caching here, but even if
we do, it should be intelligent enough to distinguish transient failures from ENOENT. The
log message in the jni-based impl also needs an improvement. It should print what exception
it encountered instead of just saying one happened.
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