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https://issues.apache.org/jira/browse/TEZ-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jaume M updated TEZ-3958:
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Attachment: TEZ-3958.1.patch
> 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
> 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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