Github user sitalkedia commented on the issue:
https://github.com/apache/spark/pull/16291
@vanzin - Thanks for taking a look and sorry about putting my unfinished
sloppy code out there. I updated the bug and the PR with the overall design
idea, which hopefully will answer your questions.
>> Each listener should process events serially otherwise you risk getting
into funny situations like a task end event being processed before the task
start event for the same task.
You are right, that's why the executor service is single threaded which
guarantees ordered processing of the events per listener.
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