Configuring Automatic Topic Creation

Automatic Topic Creation indicates that a topic will be automatically created when a message is produced in or consumed from a topic that does not exist. By default, the topic has parameters listed in Table 1.

The following parameters of cluster instances can be changed on the Parameters page: log.retention.hours (retention period), default.replication.factor (replica quantity), or num.partitions (partition quantity). The value will be used in later topics that are automatically created.

For example, assume that num.partitions is changed to 5, an automatically created topic has parameters listed in Table 1.

**Table 1** Topic parameters
Parameter	Default Value (Single-node)	Default Value (Cluster)	Modified To (Cluster)
Partitions	1	3	5
Replicas	1	3	3
Aging Time (h)	72	72	72
Synchronous Replication	Disabled	Disabled	Disabled
Synchronous Flushing	Disabled	Disabled	Disabled
Message Timestamp	CreateTime	CreateTime	CreateTime
Max. Message Size (bytes)	10,485,760	10,485,760	10,485,760

Notes and Constraints

Enabling or disabling automatic topic creation may restart the instance.

Procedure

Log in to the console.
Click in the upper left corner to select the region where your instance is located.
Click and choose Middleware > Distributed Message Service (for Kafka) to open the console of DMS for Kafka.
In the navigation pane, choose Kafka Instances.
Click the desired Kafka instance to view its details.
In the Instance Information area, click or next to Automatic Topic Creation. The Confirm dialog box is displayed.
Click OK. The Background Tasks page is displayed. Automatic topic creation has been configured when the task is in the Successful state.