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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13590) Retry until TGT expires even if the UGI renewal thread encountered exception
Date Tue, 01 Nov 2016 11:05:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625141#comment-15625141
] 

Steve Loughran commented on HADOOP-13590:
-----------------------------------------

I'm looking at {{getMaxTgtRenewalRetryCount}} and not sure I understand it. I'm confident
I could work out what it does given time, but it's not immediately obvious. What does it do?
And could some comments in the code describe that

Test-wise, I've added support for more backoff in tests that wait; look in LambdaTestUtils.

I also see that the code to set up a {{javax.security.auth.login.Configuration}} is surfacing
again...there are a fair few copies of this code around (I know one in the registry tests),
all of which have those same hacks for IBM JVMs, etc. Which makes it a maintenance pain. Could
we think about coalescing them into one or two utility methods somewhere?

> Retry until TGT expires even if the UGI renewal thread encountered exception
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-13590
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13590
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.8.0, 2.7.3, 2.6.4
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HADOOP-13590.01.patch, HADOOP-13590.02.patch, HADOOP-13590.03.patch,
HADOOP-13590.04.patch, HADOOP-13590.05.patch, HADOOP-13590.06.patch, HADOOP-13590.07.patch,
HADOOP-13590.08.patch
>
>
> The UGI has a background thread to renew the tgt. On exception, it [terminates itself|https://github.com/apache/hadoop/blob/bee9f57f5ca9f037ade932c6fd01b0dad47a1296/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L1013-L1014]
> If something temporarily goes wrong that results in an IOE, even if it recovered no renewal
will be done and client will eventually fail to authenticate. We should retry with our best
effort, until tgt expires, in the hope that the error recovers before that.



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