how to make inactive kafka topic, 카프카 토픽 비활성화

To make a Kafka topic inactive, meaning it no longer receives new messages and its data is eventually deleted, there are several strategies you can follow. Kafka doesn’t have a specific “inactive” state for topics, but you can achieve this effect by adjusting the configuration settings and permissions.

Here are some methods to make a Kafka topic "inactive":

1. Restrict Producer Access (Prevent Writing New Messages)

One way to make a Kafka topic inactive is to prevent producers from writing new messages to it. You can do this by modifying access control lists (ACLs) or configurations, depending on your Kafka setup.

Steps:

• Modify ACLs to restrict producer access to the topic. If you have security enabled, you can revoke the producer’s permission to write to the topic.

  bin/kafka-acls.sh --bootstrap-server localhost:9092 --remove --allow-principal User:<producer-user> --operation Write --topic <topic-name>

  This command will revoke the producer’s permission to write to the specified topic.

• Alternatively, block producer clients at the application level to stop sending messages to the topic.

2. Set Topic Retention Policy (Delete Messages After Expiration)

You can modify the topic's retention settings so that the topic automatically deletes its messages after a short retention period, effectively making it "inactive" over time.

Steps:

• Use kafka-topics.sh to alter the topic’s retention policy to a small value (e.g., 1 second). This ensures that all messages are quickly deleted, even if producers try to send more data.

  bin/kafka-configs.sh --alter --bootstrap-server localhost:9092 --entity-type topics --entity-name <topic-name> --add-config retention.ms=1000

  • retention.ms=1000: This configuration will cause the messages in the topic to be deleted after 1 second.

3. Set Topic to Be Compacted or Deleted Immediately

You can configure the topic to have a log compaction or immediate deletion policy.

Steps:

• Set the topic’s retention.bytes to 1, which effectively deletes messages as soon as they arrive.

  bin/kafka-configs.sh --alter --bootstrap-server localhost:9092 --entity-type topics --entity-name <topic-name> --add-config retention.bytes=1

• Alternatively, set log cleanup policy to "delete" (instead of "compact") to ensure messages are deleted based on the retention configuration.

  bin/kafka-configs.sh --alter --bootstrap-server localhost:9092 --entity-type topics --entity-name <topic-name> --add-config cleanup.policy=delete

4. Pause Consumer Consumption

You can stop consumers from reading messages from the topic without deleting the topic itself. This will prevent any consumers from processing data.

Steps:

• Modify ACLs to block consumer access:

  bin/kafka-acls.sh --bootstrap-server localhost:9092 --remove --allow-principal User:<consumer-user> --operation Read --topic <topic-name>

This prevents consumers from accessing or reading from the topic.

5. Mark Topic as Deprecated

If you want to mark the topic as deprecated without completely removing it, you can:

• Rename the topic with a deprecation prefix (though Kafka doesn't support renaming directly, you can create a new topic and reassign partitions).
• Document the topic as deprecated or "inactive" in your team's documentation to ensure it’s no longer used.

6. Delete the Topic Entirely (Optional)

If you no longer need the topic, and you want to completely remove it, you can delete the topic from the Kafka cluster.

Steps:

• Delete the topic with kafka-topics.sh:

  bin/kafka-topics.sh --delete --topic <topic-name> --bootstrap-server localhost:9092

This will remove the topic from the Kafka cluster, and it will no longer exist.

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Conclusion

To make a Kafka topic "inactive", the main approaches are:

• Restrict access for producers or consumers.
• Modify retention and cleanup policies to ensure that messages are deleted quickly.
• Optionally delete the topic if it’s no longer required.

If you're unsure about permanently deleting a topic, adjusting the retention settings or restricting access is a safer method to make the topic inactive.