Github user tzulitai commented on the pull request:
https://github.com/apache/flink/commit/7b574cf5b6e7549ae53ea0846022c4430a979a01#commitcomment-18811645
AFAIK, the original issue reporters set the parallelism to the number of
Kinesis shards because they realized only then will the checkpoint state size
not unboundly grow. They did not seem to have this misunderstanding in the
beginning.
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