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https://issues.apache.org/jira/browse/FLINK-10897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775869#comment-16775869
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boshu Zheng commented on FLINK-10897:
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Sorry for the late reply [~tzulitai], and very happy to see this happening :)
> Support POJO state schema evolution
> -----------------------------------
>
> Key: FLINK-10897
> URL: https://issues.apache.org/jira/browse/FLINK-10897
> Project: Flink
> Issue Type: Sub-task
> Components: Type Serialization System
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Major
> Fix For: 1.8.0
>
>
> Main action point for this is to implement a separate POJO serializer that is
> specifically used as the restore serializer.
> This restore POJO serializer should be able to read and dump values of fields
> that no longer exists in the updated POJO schema, and assign default values
> to newly added fields. Snapshot of the {{PojoSerializer}} should contain
> sufficient information so that on restore, the information can be compared
> with the adapted POJO class to figure out which fields have been removed /
> added.
> Changing fields types is out of scope and should not be supported.
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