Gopal V created TEZ-3958:
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Summary: 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
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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