[jira] [Assigned] (KAFKA-7663) Custom Processor supplied on addGlobalStore is not used when restoring state from topic

["Walker Carlson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-7663?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Walker Carlson reassigned KAFKA-7663:
-------------------------------------

    Assignee: Walker Carlson

> Custom Processor supplied on addGlobalStore is not used when restoring state from topic
> ---------------------------------------------------------------------------------------
>
>                 Key: KAFKA-7663
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7663
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions: 1.0.0
>            Reporter: Frederic Tardif
>            Assignee: Walker Carlson
>            Priority: Major
>              Labels: new-streams-runtime-should-fix
>         Attachments: image-2018-11-20-11-42-14-697.png
>
>
> I have implemented a StreamBuilder#{{addGlobalStore}} supplying a custom processor responsible to transform a K,V record from the input stream into a V,K records. It works fine and my {{store.all()}} does print the correct persisted V,K records. However, if I clean the local store and restart the stream app, the global table is reloaded but without going through the processor supplied; instead, it calls {{GlobalStateManagerImp#restoreState}} which simply stores the input topic K,V records into rocksDB (hence bypassing the mapping function of my custom processor). I believe this must not be the expected result?
>  This is a follow up on stackoverflow discussion around storing a K,V topic as a global table with some stateless transformations based on a "custom" processor added on the global store:
> [https://stackoverflow.com/questions/50993292/kafka-streams-shared-changelog-topic#comment93591818_50993729]
> If we address this issue, we should also apply `default.deserialization.exception.handler` during restore (cf. KAFKA-8037)
>  



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