[GitHub] [druid] clintropolis commented on pull request #10839: Add protobuf schema registry

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clintropolis commented on pull request #10839:
URL: https://github.com/apache/druid/pull/10839#issuecomment-790505170


   >@clintropolis Hi, thanks for your review. I've refine document for this feature. What else should I do before merging?
   
   I think this is g2g after CI.
   
   If you are interested in doing a follow-up PR or two, the protobuf extension is one of the few ingestion formats that has not been ported to the newer [`InputFormat`](https://github.com/apache/druid/blob/master/core/src/main/java/org/apache/druid/data/input/InputFormat.java) interface which has replaced parsers. There are a handful of implementations that could be used as reference ([JSON](https://github.com/apache/druid/blob/master/core/src/main/java/org/apache/druid/data/input/impl/JsonInputFormat.java), [Avro](https://github.com/apache/druid/blob/master/extensions-core/avro-extensions/src/main/java/org/apache/druid/data/input/avro/AvroOCFInputFormat.java), and many others). I think this should be relatively straight-forward with the protobuf extension since most of the work is being done in the decoder implementations, which could also be re-used by the `InputFormat` implementation.
   
   Another thing, after #10929 goes in it would probably be possible to add an integration test for the functionality added in this PR. A fair warning, our integration tests are a bit rough around the edges to work with, but I think most of the parts would be there (I guess the protobuf jar we can't include would need [added to the Dockerfile similar to mysql](https://github.com/apache/druid/blob/master/integration-tests/docker/Dockerfile#L44)). I'm not sure we actually have _any_ integration tests using protobuf currently.


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