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https://issues.apache.org/jira/browse/TEZ-4508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17751675#comment-17751675
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László Bodor commented on TEZ-4508:
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assigned this ticket to you [~okumin], thanks for the contribution!
let me understand this whole area better to be able to review
> Allow the FAIR_PARALLELISM mode to accept multiple source vertices
> ------------------------------------------------------------------
>
> Key: TEZ-4508
> URL: https://issues.apache.org/jira/browse/TEZ-4508
> Project: Apache Tez
> Issue Type: Sub-task
> Affects Versions: 0.10.2
> Reporter: okumin
> Assignee: okumin
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Currently, FairShuffleVertexManager with FAIR_PARALLELISM fails when two or
> more edges are configured with SCATTER_GATHER.
> https://github.com/apache/tez/blob/rel/release-0.10.2/tez-runtime-library/src/main/java/org/apache/tez/dag/library/vertexmanager/FairShuffleVertexManager.java#L198-L204
> Looking at [TEZ-3500|https://issues.apache.org/jira/browse/TEZ-3500], we
> assume the situation with such multiple sources happens when the vertex
> performs JOIN. In that case, I agree we definitely need more than the current
> FairShuffleVertexManager.
> However, the current fair routing with multiple sources sufficiently works
> when the sources are symmetric. One case I assume is UNION ALL + bucketed
> INSERT.
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