[
https://issues.apache.org/jira/browse/TEZ-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535358#comment-16535358
]
ASF GitHub Bot commented on TEZ-3958:
-------------------------------------
Github user beltran commented on the issue:
https://github.com/apache/tez/pull/23
As @ewohlstad pointed out there was a comma after the priority. This is how
it looks now:
```
digraph INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_ {
graph [ label="INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_", fontsize=24,
fontname=Helvetica];
node [fontsize=12, fontname=Helvetica];
edge [fontsize=9, fontcolor=blue, fontname=Arial];
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1__dummy_table" [ label =
"Map_1[_dummy_table]", shape = "box" , color= "black"];
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1__dummy_table" ->
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1" [ label = "Input
[inputClass=MRInputLegacy,\n initializer=MRInputAMSplitGenerator]" ];
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1" [ label =
"Map_1[MapTezProcessor,\n priority=2]" , color= "black" ];
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1" ->
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1_out_Map_1" [ label =
"Output [outputClass=MROutput,\n committer=]" ];
"INSERT_INTO_ntest_id_age_VALUES_1_1_Stage_1_.Map_1_out_Map_1" [ label =
"Map_1[out_Map_1]", shape = "box" , color= "black"];
}
```
> 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, TEZ-3958.2.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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