Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15618
Hm.. @srowen @tdas and @mridulm . I just got rid of the changes in
`ReceiverTracker.scala` here for now. It seems we can't make this `null` in
`stop()` and create an instance in `start()` because this instance is being
accessed after gracefully stopped. It seems the blocks should be able to be
retrieved after stopped.
One way I am thinking is, initiate this `ReceivedBlockTracker` instance at
`start()` in `ReceiverTracker` and add null checks in each method using
`ReceivedBlockTracker` instance in `ReceiverTracker`. However, I am not sure
whether it is worth adding such checks and that this is right or cleanest way
as I am not familiar with this streaming part.
Could I please ask anyone who is familiar with this to make a followup if
it is fine?
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