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Posted to issues@tez.apache.org by "okumin (Jira)" <ji...@apache.org> on 2023/08/07 08:15:00 UTC

[jira] [Created] (TEZ-4508) Allow the FAIR_PARALLELISM mode to accept multiple source vertices

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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