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https://issues.apache.org/jira/browse/TEZ-1190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636084#comment-14636084
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Bikas Saha commented on TEZ-1190:
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VertexGroup can only be the source of a group input edge and not the
destination. So I dont think Pig could have made VG1 the destination of 2 input
edges. Perhaps what is happening here is that there are 2 vertices inside VG1
which are receiving the 2 inputs from V1?
> 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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