[jira] [Commented] (TEZ-4102) Let session credentials be merged before merging am launch credentials

["László Bodor (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-4102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008794#comment-17008794 ] 

László Bodor commented on TEZ-4102:
-----------------------------------

created unit test for demonstrating the fix
could you please take a look [~rbalamohan], [~jeagles]?

> Let session credentials be merged before merging am launch credentials
> ----------------------------------------------------------------------
>
>                 Key: TEZ-4102
>                 URL: https://issues.apache.org/jira/browse/TEZ-4102
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: László Bodor
>            Assignee: László Bodor
>            Priority: Major
>         Attachments: TEZ-4102.01.patch, TEZ-4102.02.patch, TEZ-4102.03.patch, TEZ-4102.04.patch
>
>
> Given the following scenario: kerberos + long running session + dags keep submitted to the session
> After 24h the queries can fail, because tasks don't have the correct HDFS_DELEGATION_TOKEN, because there is chance that am credentials has been previously filled with tokens and it cannot be overridden by session credentials [here|https://github.com/apache/tez/blob/master/tez-api/src/main/java/org/apache/tez/client/TezClientUtils.java#L485] 



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