[jira] [Created] (FLINK-19972) Provide more details when type serializers are not compatible

["Nico Kruber (Jira)" <ji...@apache.org>]

Nico Kruber created FLINK-19972:
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             Summary: Provide more details when type serializers are not compatible
                 Key: FLINK-19972
                 URL: https://issues.apache.org/jira/browse/FLINK-19972
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / State Backends
    Affects Versions: 1.11.2
            Reporter: Nico Kruber
            Assignee: Nico Kruber
             Fix For: 1.12.0


Currently, when the type serializer is incompatible, you get exceptions like these:
{code:java}
StateMigrationException("For heap backends, the new namespace serializer must be compatible.");
StateMigrationException("The new namespace serializer must be compatible.");

StateMigrationException("For heap backends, the new state serializer must not be incompatible.");
StateMigrationException("The new state serializer cannot be incompatible.")

StateMigrationException("The new key serializer must be compatible."){code}
which are not really helpful to the user in debugging serializers.

Since we already have the old serializer (snapshot) and the new one available, we should add this detail to the exceptions for improved usability.



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