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https://issues.apache.org/jira/browse/TEZ-1190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623227#comment-15623227
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Bikas Saha commented on TEZ-1190:
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+1 for design doc.
A while back we had discussed about this and thought that an edge name could be
made optional in the edge definition. When the name is specified, its used. If
not specified, it defaults to the source/destination as it does today. So
existing edges would continue to work with the implicit default. That seemed
like a natural extension API-wise. Would be good to know if this design is
being used or a new design is being proposed. Thanks!
> Allow multiple edges between two vertices
> -----------------------------------------
>
> Key: TEZ-1190
> URL: https://issues.apache.org/jira/browse/TEZ-1190
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Daniel Dai
> Assignee: Zhiyuan Yang
>
> 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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