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

["Frederic Tardif (JIRA)" <ji...@apache.org>]

Frederic Tardif created KAFKA-7663:
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             Summary: 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: Bug
          Components: streams
    Affects Versions: 1.0.0
            Reporter: Frederic Tardif
         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]

 

 



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