Jiang Xingbo created SPARK-24817:
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Summary: Implement BarrierTaskContext.barrier()
Key: SPARK-24817
URL: https://issues.apache.org/jira/browse/SPARK-24817
Project: Spark
Issue Type: New Feature
Components: Spark Core
Affects Versions: 2.4.0
Reporter: Jiang Xingbo
Implement BarrierTaskContext.barrier(), to support global sync between all the
tasks in a barrier stage. The global sync shall finish immediately once all
tasks in the same barrier stage reaches the same barrier.
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