[jira] [Updated] (FLINK-6944) Introduce DefaultTypeSerializerConfigSnapshot as a base implementation for serializer compatibility checks

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-6944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-6944:
------------------------------------
    Priority: Blocker  (was: Major)

> Introduce DefaultTypeSerializerConfigSnapshot as a base implementation for serializer compatibility checks
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-6944
>                 URL: https://issues.apache.org/jira/browse/FLINK-6944
>             Project: Flink
>          Issue Type: Improvement
>          Components: State Backends, Checkpointing, Type Serialization System
>    Affects Versions: 1.3.0, 1.3.1
>            Reporter: Tzu-Li (Gordon) Tai
>            Assignee: Tzu-Li (Gordon) Tai
>            Priority: Blocker
>             Fix For: 1.4.0
>
>
> Currently, we store both the {{TypeSerializer}} and its corresponding {{TypeSerializerConfigSnapshot}} in checkpoints of managed state. This, in most cases, are actually duplicate information.
> This JIRA proposes to change this by only storing the {{TypeSerializerConfigSnapshot}}, while at the same time, letting {{TypeSerializer.snapshotConfiguration}} return a default {{DefaultTypeSerializerConfigSnapshot}}.
> This default simply serializes the serializer instance using Java serialization.
> The {{DefaultTypeSerializerConfigSnapshot}} should wrap the serializer bytes, the serialVersionUID of the serializer class, and the serializer class' classname. The latter two will be used to check compatibility in the default implementation of {{TypeSerializer.ensureCompatibility}}. Specifically, if classname / serialVersionUID has changed, the default implementation of {{TypeSerializer.ensureCompatibility}} will simply return {{CompatibilityResult.requiresMigration}} with the deserialized serializer as the convert deserializer.



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