Sarth Frey created SPARK-30800:
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Summary: Refactor BarrierTaskContext barrier method to use
allGather directly
Key: SPARK-30800
URL: https://issues.apache.org/jira/browse/SPARK-30800
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 3.1.0
Reporter: Sarth Frey
Issue is only present if this PR getting merged:
[https://github.com/apache/spark/pull/27395]
Currently the `BarrierTaskContext.barrier` method and the
`BarrierTaskContext.allGather` method both call the
`BarrierTaskContext.runBarrier` method to perform the majority of the majority
of the computation. A refactor to reduce complexity would be to change the
`BarrierTaskContext.barrier` method to simply call
`BarrierTaskContext.allGather` with an empty string as input and return `Unit`
to the user. In this way, we can remove the `requestMethod` field from
`RequestToSync` and do not have to case on `BarrierRequestToSync` and
`AllGatherRequestToSync` in the `BarrierCoordinator` code.
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