UserGroupInformation fails to login if thread's context classloader can't load
HadoopLoginModule
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Key: HADOOP-7982
URL: https://issues.apache.org/jira/browse/HADOOP-7982
Project: Hadoop Common
Issue Type: Bug
Components: security
Affects Versions: 1.0.0, 0.23.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
In a few hard-to-reproduce situations, we've seen a problem where the UGI login
call causes a failure to login exception with the following cause:
Caused by: javax.security.auth.login.LoginException: unable to find
LoginModule class: org.apache.hadoop.security.UserGroupInformation
$HadoopLoginModule
After a bunch of debugging, I determined that this happens when the login
occurs in a thread whose Context ClassLoader has been set to null.
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