Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22923
> We need to always update user accumulators
Ah that's a good point.
I'm going to close it. I missed one thing: the `AppStatusListener` will
keep the `StageInfo` instance until all tasks of that stage attempt is
finished. See https://github.com/apache/spark/pull/22209
So this bug should already have been fixed.
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