UserGroupInformation doesn't support use in hash tables
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Key: HADOOP-6670
URL: https://issues.apache.org/jira/browse/HADOOP-6670
Project: Hadoop Common
Issue Type: Bug
Components: security
Reporter: Owen O'Malley
Assignee: Owen O'Malley
The UserGroupInformation objects are mutable, but they are used as keys in hash
tables. This leads to serious problems in the FileSystem cache and RPC
connection cache. We need to change the hashCode to be the identity hash code
of the Subject and change equals to use == between the Subjects.
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