[jira] [Commented] (FLINK-30656) Provide more logs for schema compatibility check

["Leonard Xu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-30656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17676543#comment-17676543 ] 

Leonard Xu commented on FLINK-30656:
------------------------------------

Thanks [~masteryhx]for opening this ticket, +1 to add key logs for  schema compatibility check.

> Provide more logs for schema compatibility check
> ------------------------------------------------
>
>                 Key: FLINK-30656
>                 URL: https://issues.apache.org/jira/browse/FLINK-30656
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / Type Serialization System
>            Reporter: Hangxiang Yu
>            Assignee: Hangxiang Yu
>            Priority: Major
>
> Currently, we have very few logs and exception info when checking schema compatibility.
> It's difficult to see why the compatibility is not compatible, especially for some complicated nested serializers.
> For example, for map serializer, when it's not compatible, we may only see below without other information:
> {code:java}
> Caused by: org.apache.flink.util.StateMigrationException: The new state serializer (org.apache.flink.api.common.typeutils.base.MapSerializer@e95e076a) must not be incompatible with the old state serializer (org.apache.flink.api.common.typeutils.base.MapSerializer@c33b100f). {code}
> So I think we could add more infos when checking the compatibility.



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