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https://issues.apache.org/jira/browse/TEZ-1190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14021219#comment-14021219
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Chen He commented on TEZ-1190:
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I think multiple edges exist if they are different directions in directed
graph. It means there is a circle between two vertex.
In undirected graph, edge between two vertices represents the connectivity
between to vertices.
> Allow multiple edges between two vertexes
> -----------------------------------------
>
> Key: TEZ-1190
> URL: https://issues.apache.org/jira/browse/TEZ-1190
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Daniel Dai
>
> This will be helpful in some scenario. In particular example, we can merge
> two small pipelines together in one pair of vertex. Note it is possible the
> edge type between the two vertexes are different.
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