Kafka Connect - Storage Topics

Converter Basics


The distributed workers are stateless.

The data are stored within internal Kafka topics:



Connect creates this topics for you but you can create them yourself:

# config.storage.topic=connect-configs
$ bin/kafka-topics --create --zookeeper localhost:2181 --topic connect-configs --replication-factor 3 --partitions 1 --config cleanup.policy=compact

# offset.storage.topic=connect-offsets
$ bin/kafka-topics --create --zookeeper localhost:2181 --topic connect-offsets --replication-factor 3 --partitions 50 --config cleanup.policy=compact

# status.storage.topic=connect-status
$ $ bin/kafka-topics --create --zookeeper localhost:2181 --topic connect-status --replication-factor 3 --partitions 10 --config cleanup.policy=compact

List them

kafka-topics --list --zookeeper localhost:2181 | grep -i connect

  • Query them
kafka-console-consumer \
--bootstrap-server localhost:9092 \
--from-beginning \
--property print.key=true \
--topic connect-offsets


The offsets, status, and configurations are written to the topics using converters specified through the following required properties.


Most users will always want to use the JSON converter without schemas. Offset and config data is never visible outside of Connect in this format.

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