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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15717) TGT renewal thread does not log IOException
Date Mon, 08 Oct 2018 22:26:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642558#comment-16642558
] 

Robert Kanter commented on HADOOP-15717:
----------------------------------------

I might be missing something here, but it looks like we already log the Exception at the WARN
level on line 945:
https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L945
However, before reaching there, it first checks a few special cases; and if those are satisfied,
it won't get to this WARN log statement.  Those cases (TGT destroyed and TGTG end time is
null) have sufficient ERROR log levels that I think that's okay.  If we want to have the stack
trace, then I think it's fine to just add the Exception to those log messages, which I believe
are the ones that [~xiaochen] was referring to.

> TGT renewal thread does not log IOException
> -------------------------------------------
>
>                 Key: HADOOP-15717
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15717
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Szilard Nemeth
>            Assignee: Szilard Nemeth
>            Priority: Major
>         Attachments: HADOOP-15717.001.patch
>
>
> I came across a case where tgt.getEndTime() was returned null and it resulted in an NPE,
this observation was popped out of a test suite execution on a cluster. The reason for logging
the {{IOException}} is that it helps to troubleshoot what caused the exception, as it can
come from two different calls from the try-catch.
> I can see that [~gabor.bota] handled this with HADOOP-15593, but apart from logging the
fact that the ticket's {{endDate}} was null, we have not logged the exception at all.
> With the current code, the exception is swallowed and the thread terminates in case the
ticket's {{endDate}} is null. 
> As this can happen with OpenJDK for example, it is required to print the exception (stack
trace, message) to the log.
> The code should be updated here: https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L918



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