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Christopher Tubbs commented on HADOOP-6670: ------------------------------------------- I just tried to compare two UGIs using UserGroupInformation.equals() and it failed, because even though they had the same Subject (.equals), they were not the same instance (==). This seems like a bug which was introduced here. Why was (==) used to compare Subject? Was this intentional? > UserGroupInformation doesn't support use in hash tables > ------------------------------------------------------- > > 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 > Priority: Major > Fix For: 0.22.0 > > Attachments: 6670-gridmix-test.bugfix.patch, c6670-02.patch, > c6670-03.patch, fs-close.patch, fs-close.patch, fs-close.patch > > > 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org