[jira] [Assigned] (TEZ-3958) Add internal vertex priority information into the tez dag.dot debug information

["Gopal V (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V reassigned TEZ-3958:
----------------------------

    Assignee: Jaume M

> Add internal vertex priority information into the tez dag.dot debug information
> -------------------------------------------------------------------------------
>
>                 Key: TEZ-3958
>                 URL: https://issues.apache.org/jira/browse/TEZ-3958
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Gopal V
>            Assignee: Jaume M
>            Priority: Major
>         Attachments: TEZ-3958.1.patch
>
>
> Adding the actual vertex priority as computed by Tez into the debug dag.dot file would allows the debugging of task pre-emption issues when the DAG is no longer a tree.
> There are pre-emption issues with isomerization of Tez DAGs, where the a R-isomer dag with mirror rotation runs at a different speed than the L-isomer dag, due to priorities at the same level changing due to the vertex-id order.
> Since the problem is hard to debug through, it would be good to record the computed priority in the DAG .dot file in the logging directories.



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