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https://issues.apache.org/jira/browse/TEZ-2206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14369598#comment-14369598
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Hitesh Shah commented on TEZ-2206:
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I think from a publishing to ATS point of view, we are always going to be using
the AM user's UGI. The only difference would be to ensure that the dag user is
added to the acl list. This is already being done today except that the dag
user is always the same as the AM user. Creating a DAG specific domain is also
implemented today but everything is done via the appMaster UGI I believe.
Although today we have some functionality to allow a DAG user to be other than
the AM user, there is no clear way to distinguish who the dag user was as we
just allow an additional set of credentials to be passed in.
> DAG user sent to ATS via DAGSubmittedEvent is always the AM user
> -----------------------------------------------------------------
>
> Key: TEZ-2206
> URL: https://issues.apache.org/jira/browse/TEZ-2206
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Hitesh Shah
>
> There probably needs to be a way to support a way to attach a user id to a
> DAG especially in the case where a single AM is being used to run DAGs for
> different users.
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