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https://issues.apache.org/jira/browse/HADOOP-12741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15119100#comment-15119100
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Vinayakumar B commented on HADOOP-12741:
----------------------------------------
I am seeing this part, which creates the thread and starts it, but this is
called from {{UGI#loginUserFromSubject(..)}}
{code} Thread t = new Thread(new Runnable() {
@Override
public void run() {
String cmd = conf.get("hadoop.kerberos.kinit.command",
"kinit");
KerberosTicket tgt = getTGT();
if (tgt == null) {
return;
}
long nextRefresh = getRefreshTime(tgt);
while (true) {
try {
long now = Time.now();
if(LOG.isDebugEnabled()) {
LOG.debug("Current time is " + now);
LOG.debug("Next refresh is " + nextRefresh);
}
if (now < nextRefresh) {
Thread.sleep(nextRefresh - now);
}
Shell.execCommand(cmd, "-R");
if(LOG.isDebugEnabled()) {
LOG.debug("renewed ticket");
}
reloginFromTicketCache();
tgt = getTGT();
if (tgt == null) {
LOG.warn("No TGT after renewal. Aborting renew thread for " +
getUserName());
return;
}
nextRefresh = Math.max(getRefreshTime(tgt),
now + MIN_TIME_BEFORE_RELOGIN);
} catch (InterruptedException ie) {
LOG.warn("Terminating renewal thread");
return;
} catch (IOException ie) {
LOG.warn("Exception encountered while running the" +
" renewal command. Aborting renew thread. " + ie);
return;
}
}
}
});
t.setDaemon(true);
t.setName("TGT Renewer for " + getUserName());
t.start();{code}
> 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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