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https://issues.apache.org/jira/browse/SPARK-24581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jiang Xingbo resolved SPARK-24581.
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Resolution: Fixed
> Design: BarrierTaskContext.barrier()
> ------------------------------------
>
> Key: SPARK-24581
> URL: https://issues.apache.org/jira/browse/SPARK-24581
> Project: Spark
> Issue Type: Story
> Components: ML, Spark Core
> Affects Versions: 3.0.0
> Reporter: Xiangrui Meng
> Assignee: Jiang Xingbo
> Priority: Major
>
> We need to provide a communication barrier function to users to help
> coordinate tasks within a barrier stage. This is very similar to MPI_Barrier
> function in MPI. This story is for its design.
>
> Requirements:
> * Low-latency. The tasks should be unblocked soon after all tasks have
> reached this barrier. The latency is more important than CPU cycles here.
> * Support unlimited timeout with proper logging. For DL tasks, it might take
> very long to converge, we should support unlimited timeout with proper
> logging. So users know why a task is waiting.
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