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https://issues.apache.org/jira/browse/TEZ-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028865#comment-14028865
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Bikas Saha commented on TEZ-1172:
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Java docs would be a good way to inform users (along with a runtime check in
the root input manager if possible).
In that case, we should remove the check from this patch that requires custom
manager to be set when multiple inputs are specified. Its reasonable for the
app to fail if the user does wrong things because the user can correct it and
make the job pass. But its unreasonable for a valid app to fail until we remove
a restrictive check in a future release IMO.
> Allow multiple Root Input initializers to be specified per Vertex
> -----------------------------------------------------------------
>
> Key: TEZ-1172
> URL: https://issues.apache.org/jira/browse/TEZ-1172
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Siddharth Seth
> Assignee: Siddharth Seth
> Attachments: TEZ-1172.1.txt, TEZ-1172.2.txt
>
>
> The default VertexManager in Tez for this handles only 1 RootInput - since it
> doesn't know how to combine multiple different Inputs. However, if a custom
> vertex manager plugin is specified by users - it should be possible to
> specify multiple RootInputs.
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