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https://issues.apache.org/jira/browse/FLINK-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16006942#comment-16006942
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Stephan Ewen commented on FLINK-6554:
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+1, incompatibility is always possible and should lead to a graceful failure
with a good error message
> CompatibilityResult should contain a notCompatible() option
> -----------------------------------------------------------
>
> Key: FLINK-6554
> URL: https://issues.apache.org/jira/browse/FLINK-6554
> Project: Flink
> Issue Type: Improvement
> Components: Type Serialization System
> Affects Versions: 1.3.0, 1.4.0
> Reporter: Chesnay Schepler
> Priority: Minor
>
> The {{CompatibilityResult}} allows a {{TypeSerializer}} to specify whether it
> is compatible based on the given {{TypeSerializerConfigSnapshot}}.
> As it stands the only options are {{compatible}} and {{requiresMigration}}.
> We should allow serializers to also notify the system of an incompatibility
> which should then fail the job.
> This would for example be required when a serializer provides an upgrade path
> version1 -> version2 -> version3, but not directly from version1 -> version3.
> Currently, the serializer would either have to contain logic to upgrade from
> every single previous version or simply throw an exception on it's own.
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