satybald opened a new issue #7366: Add custom Json extractors for kafka-extraction-namespace URL: https://github.com/apache/incubator-druid/issues/7366 ### Description Provide functionality to use JSON payloads for `kafka-extraction-namespace`, with option specifying key and values objects in the payload. ### Motivation Small Kafka topics are quite dynamic and useful concept to have as a data source for lookups(aka facts tables). However, the current implementation of [Kafka Lookups](http://druid.io/docs/latest/development/extensions-core/kafka-extraction-namespace.html) uses only topic message payload as values and topic key as the key for druid lookup map. This a rigid setup, requires a team to transform existing topics to plain key/value topic. It would be better to have flexibility and extract values and keys from the message payload as UriExtractionNamespace in druid does.
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