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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2018/06/18 15:42:00 UTC

[jira] [Created] (SPARK-24581) Design: BarrierTaskContext.barrier()

Xiangrui Meng created SPARK-24581:
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             Summary: 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


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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