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Thanks for the pointers Andrey, they helped us zero in on the issue. We found that it was a bug in our Scala code that caused Flink to use Kryo serializer to read Avro-based state. We've fixed it, and are able to evolve state-schema seamlessly now. On Tue, Aug 25, 2020 at 9:53 PM Andrey Zagrebin < [hidden email]> wrote: Hi Daksh,
You need to find which type causes the problem: Long, MyCustomObject or maybe something else. You could share the logs with full exception stack trace. My guess is that your scala code uses another serializer for the failing type. See also docs to understand serialization in Flink [1]
When you restore the state after changing the job, the new serializer, used for the state type, should be compatible with the serializer, used to store the state in the previous version of the job [2].
I also cc Gordon who could have more ideas about the problem.
Best,
Hello,
We run a Stream API based Flink application on 1.10.0, coded in Java. While moving this job to Scala (reasons unrelated to Flink/this application), we are getting the following error when trying to instantiate Scala job from a savepoint taken in the Java job:
org.apache.flink.util.StateMigrationException: The new state typeSerializer for operator state must not be incompatible.
We can see that this error occurs while instantiating a ValueState<T> state in our KeyedProcessFunction. The KeyedProcessFunction instantiates two ValueState objects - ValueState<Long> and ValueState<MyCustomObject>. Our hunch is that it's the latter facing issues while loading from Savepoint.
We have ensured that the KeyedProcessFunction has the same id in both the jobs; and the new job is run with `--allowNonRestoredState` flag to discard state for other operators.
Has anyone in the community attempted this before, and faced such issues or succeeded?
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