Github user aljoscha commented on the issue: https://github.com/apache/flink/pull/2962 Thanks for changing! I just realised, however, that we already have tests in `StateBackendTestBase` that check for restoring from wrong serialisers so we don't actually need those. I will also split the changes into 4 commits, you already split into FLINK-5282 and FLINK-5283, the later commits I will split into "[FLINK-5041] Savepoint Backwards Compatibility 1.1 -> 1.2" since these are essentially fixups for that and are not related to FLINK-5051. The last commit will contain the actual changes for FLINK-5051. What do you think?
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