I would also be interested on instructions/discussion on how to state-migrate 
from pre-unified sources/sinks to unified ones (Kafka) 😊

Thias

From: Mason Chen <mas.chen6...@gmail.com>
Sent: Mittwoch, 27. Oktober 2021 01:52
To: user <user@flink.apache.org>
Subject: FlinkKafkaConsumer -> KafkaSource State Migration

Hi all,

I read these instructions for migrating to the KafkaSource:
https://nightlies.apache.org/flink/flink-docs-release-1.14/release-notes/flink-1.14/#deprecate-flinkkafkaconsumer.

Do we need to employ any uid/allowNonRestoredState tricks if our Flink job is 
also stateful outside of the source? Or what is the mechanism that resolves the 
topic/partition/offsets in the stateful upgrade? Will restoring from 
FlinkKafkaConsumer cause an exception due to incompatibility of the union state 
to the current (what is it again)?

Best,
Mason
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