okumin created TEZ-4508:
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Summary: 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
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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