hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Kihwal Lee (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8088) User-group mapping cache incorrectly does negative caching on transient failures
Date Fri, 17 Feb 2012 22:12:57 GMT
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: 1.0.0, 0.20.205.0, 0.24.0, 0.23.1, 1.1.0
            Reporter: Kihwal Lee
             Fix For: 0.24.0, 1.1.0, 0.23.2


We've seen a case where some getGroups calls fail when the ldap server or the network has
a transient issue. Looking the code, the shell-based and the JNI-based implementation 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 cach 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 imple also needs an improvement. It should print what exception it encountered instead
of just saying one happened.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message