[jira] [Commented] (HADOOP-12741) UserGroupInformation.loginUserFromKeytab() creates background thread which is not getting killed even after application exited

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15117720#comment-15117720 ] 

Steve Loughran commented on HADOOP-12741:
-----------------------------------------

# it's tagged as a daemon thread, so shouldn't be reason to keep your code running. When your main threads should exit, so should this.

# yes, some shutdown operation might be nice.

> UserGroupInformation.loginUserFromKeytab() creates background thread which is not getting killed even after application exited
> ------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-12741
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12741
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: security
>    Affects Versions: 2.6.3
>            Reporter: Umesh K
>
> Hi UserGroupInformation.loginUserFromKeytab() method creates one background thread for keytab refresh after every 10 hours I guess. One of my application is using UserGroupInformation.loginUserFromKeytab() but at the end of my application the background thread created by it does not get killed it keeps on running. How do I kill/stop thead started by UserGroupInformation.loginUserFromKeytab()? Please guide or please provide method inside UserGroupInformation so that we can kill it or stop it. Thanks in advance. 



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