[SPARK-22764][core] Fix flakiness in SparkContextSuite. #19956
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Use a semaphore to synchronize the tasks with the listener code that is trying to cancel the job or stage, so that the listener won't try to cancel a job or stage that has already finished.
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Test build #84799 has finished for PR 19956 at commit
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lgtm |
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merged to master |
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Use a semaphore to synchronize the tasks with the listener code
that is trying to cancel the job or stage, so that the listener
won't try to cancel a job or stage that has already finished.