KKcorps opened a new pull request, #9220:
URL: https://github.com/apache/pinot/pull/9220

   Currently, the protocol buffer decoder for realtime data only supports file 
descriptors. This PR adds support for Confluent Kafka Schema Registry as well. 
You can set the following options to read schema from the registry
   
   ```json
   "stream.kafka.decoder.class.name": 
"org.apache.pinot.plugin.inputformat.protobuf.KafkaConfluentSchemaRegistryProtoBufMessageDecoder",
   "stream.kafka.decoder.prop.schema.registry.rest.url": 
"http://localhost:2222/schemaRegistry";,
   "stream.kafka.cached.schema.map.capacity": 1000
   ```
   
   **Prerequisite**
   The messages in the kafka topic should be serialized using 
`io.confluent.kafka.serializers.protobuf.KafkaProtobufSerializer` for the 
decoder to work correctly


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