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.

After you change the value of the log.retention.hours (retention period), default.replication.factor (replica quantity), or num.partitions (partition quantity) parameter, 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	Modified Value
Partitions	3	5
Replicas	3	3
Aging Time (h)	72	72
Synchronous Replication	Disabled	Disabled
Synchronous Flushing	Disabled	Disabled
Message Timestamp	CreateTime	CreateTime
Max. Message Size (bytes)	10,485,760	10,485,760

Procedure

Log in to the console.
Click in the upper left corner to select a region.

Select the region where your Kafka instance is located.
Click and choose Middleware > Distributed Message Service (for Kafka) to open the console of DMS for Kafka.
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.

Enabling or disabling automatic topic creation may cause instance restarts.
Click OK.

You can view the execution status of the task on the Background Tasks page.