Github user gaborgsomogyi commented on the issue: https://github.com/apache/spark/pull/20807 I've executed more invasive tests on the cluster and this PR didn't solve all the issues. As another not so invasive approach tried to catch the exception in `runDriver` but failed another way because `ApplicationMaster` halfway initialised. I see that the only option is to pause the userClassThread until the initialisation finishes.
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