Quickly and Elegantly Create a Topic in Know Streaming

Operation Process

① Click **Add Topic**.

② Fill in the basic information and configuration for the Topic.

③ Click **Confirm** to create the Topic successfully.

Highlights

The interface is simple and clear, allowing you to create a new Topic very quickly. Beyond the basic function, you can also perform fine‑grained custom configurations for each Topic.

Cleanup Policy Configuration

By default, a regular Topic uses the delete cleanup policy, while the internal __consumer_offset Topic uses compact. delete: expired messages are removed directly. compact: messages are compacted; for identical keys, only the latest value is retained. For example, __consumer_offset records the offset of a consumer group. Each time the group writes an offset, the key stays the same but the value changes, so reading the key returns the most recent offset. Expired messages are cleaned up, deleting older entries.

Testing Message Size

If you need to set a specific size for the Topic but are unsure of the message size, Know Streaming provides a calculation window.

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When you paste your message payload into the window, the system automatically displays the byte usage, giving you a reference for configuring parameter attributes.

Additional Custom Attribute Configuration

The configurations below apply only to the specific Topic and are all dynamic properties.

For details on dynamic configuration, see the article on Kafka's dynamic configuration management.