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https://issues.apache.org/jira/browse/FLINK-12870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai resolved FLINK-12870.
-----------------------------------------
Resolution: Fixed
Fix Version/s: 1.9.0
Merged for 1.9.0: 641cbed1da37357b8c14a0cec5d33235bcf3a30f
> Improve documentation of keys schema evolution
> ----------------------------------------------
>
> Key: FLINK-12870
> URL: https://issues.apache.org/jira/browse/FLINK-12870
> Project: Flink
> Issue Type: Improvement
> Components: Documentation
> Reporter: Alexander Fedulov
> Assignee: Alexander Fedulov
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> There are certain pitfall when modifying classes used as keys.
> For instance, removing a field from a key's class would cause
> nondeterministic behavior when using RocksDB state backend, which relies on
> binary objects identity, rather than hashCode implementation.
> Documentation should mention that keys evolution is not supported and
> specifically that when using Kryo serializers, framework would not be able to
> capture potential incompatibility with the previous state format.
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