ajithme edited a comment on issue #24056: [SPARK-26152] Synchronize Worker 
Cleanup with Worker Shutdown
URL: https://github.com/apache/spark/pull/24056#issuecomment-471579398
 
 
   the lock makes sure that during submission of tasks (multiple tasks are 
submitted as part of the loop), the executorpool is not shutdown (even though 
on shutdown, tasks may be interrupted and end up not cleaning).. if i remove 
the lock, the submission exception may still reoccurr right.?

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