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From "Ravi Prakash (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7450) ATS Client should retry on intermittent Kerberos issues.
Date Mon, 13 Nov 2017 16:53:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249816#comment-16249816

Ravi Prakash commented on YARN-7450:

This is more complicated than I thought. [UserGroupInformation.reloginFromKeyTab()|https://github.com/apache/hadoop/blob/975a57a6886e81e412bea35bf597beccc807a66f/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L1321]
*clears* away existing credentials, so a temporary Kerberos failure which may have been resolved
by trying to retry the login in some time, will be exhibited immediately.

Hi [~daryn] ! Am I reading this right? Is it practical to fix this behavior?

> ATS Client should retry on intermittent Kerberos issues.
> --------------------------------------------------------
>                 Key: YARN-7450
>                 URL: https://issues.apache.org/jira/browse/YARN-7450
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: ATSv2
>    Affects Versions: 2.7.3
>         Environment: Hadoop-2.7.3
>            Reporter: Ravi Prakash
> We saw a stack trace (posted in the first comment) in the ResourceManager logs for the
TimelineClientImpl not being able to relogin from keytab.
> I'm guessing there was an intermittent network issue that failed the kerberos relogin
from keytab. However, I'm assuming this was *not* retried because I only saw one instance
of this stack trace.  I propose that this operation should have been retried.
> It seems, this caused events at the ResourceManager to queue up and eventually stop responding
to even basic {{yarn application -list}} commands.

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