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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6913) Circular initialization between UserGroupInformation and KerberosName
Date Fri, 27 Aug 2010 21:59:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903665#action_12903665

Kan Zhang commented on HADOOP-6913:

The javadoc warnings are due to KerberosName.java and SecurityUtil.java and unrelated to this
patch. TestBlockToken in HDFS has been failing because of this bug. It can serve as the test
for this patch (once HDFS-1284 is committed).

> Circular initialization between UserGroupInformation and KerberosName
> ---------------------------------------------------------------------
>                 Key: HADOOP-6913
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6913
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>            Reporter: Kan Zhang
>            Assignee: Kan Zhang
>         Attachments: c6913-01.patch
> If the first call to UGI is UGI.setConfiguration(conf), it will try to initialize UGI
class. During this initialization, the code calls KerberosName.setConfiguration(). KerberosName's
static initializer will in turn call UGI.isSecurityEnabled(). Since UGI hasn't been completely
initialized yet, isSecurityEnabled() will re-initialize UGI with a DEFAULT conf. As a result,
the original conf used in UGI.setConfiguration(conf) will be overwritten by the DEFAULT conf.

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