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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