GH-3637: Fix KafkaMessageSource First Poll #3638
Merged
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Resolves #3637
If there are no records to receive, the poll blocked for
20*pollTimeout
.Wake the consumer during partition assignment; however, this changes the behavior
when there are records present - the first poll always returns no records.
Detect that the wakeup was due to assignment and perform another poll.
Also add some debug logging, and don't create a new consumer if the source was
stopped.
cherry-pick to 5.4.x