yikf created SPARK-35722:
----------------------------

             Summary: wait until until something does get queued
                 Key: SPARK-35722
                 URL: https://issues.apache.org/jira/browse/SPARK-35722
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.0.0
            Reporter: yikf
             Fix For: 3.2.0


 if nothing has been added to the queue, should wait until something does get 
queued instead of loop after timeout.

It prevents an ineffective cycle.



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