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https://issues.apache.org/jira/browse/TEZ-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337841#comment-14337841
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Jeff Zhang commented on TEZ-1972:
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Graphviz don't support subgraph overlapping, so there will be issues when one
vertex belong to multiple vertexgroups.
> Visualize Vertex Group as subgraph
> ----------------------------------
>
> Key: TEZ-1972
> URL: https://issues.apache.org/jira/browse/TEZ-1972
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jeff Zhang
> Attachments: dag_1421403190483_0031_1.pdf
>
>
> In the dot file, the vertex group info is missed, we can group the vertex
> group as subgraph. Attachment is a simple example.
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