xuanyuanking commented on issue #23435: [SPARK-25921][Follow Up][PySpark] Fix 
barrier task run without BarrierTaskContext while python worker reuse
URL: https://github.com/apache/spark/pull/23435#issuecomment-451203155
 
 
   ```
   It seems that the worker reuse didn't take effect in python3, I'm looking 
into this, not sure it's a bug or not.
   ```
   It's a bug that worker reuse loses efficacy caused by the unexpected return 
of checking the end of stream logic in python worker, I'll give another PR and 
JIRA tomorrow to fix it, this PR will continue after the problem fix.

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