Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/17610
Isn't it not depending on 'this' being locked in super class method ?
If it is not, then why not simply restrict lock to changing of `stopping`
flag (if already set, return, else set and proceed down method) ? In which
case, use of `this` will do without need for a new lock ?
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