Github user CodingCat commented on the issue:
https://github.com/apache/spark/pull/15675
Sorry, I misunderstood the real reason of the bug
The real reason is actually very simple...the original postToAll() is
actually calling `StreamingQueryListenerBus.postToAll()` which has no listener
at all....we shall post by `sparkListenerBus.postToAll(s)` and
`this.postToAll()` to trigger local listeners as well as the listeners
registered in LiveListenerBus
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