Automatic Topic Creation

Parameter Explanation

Automatic Topic Creation

If this option is enabled, 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 the parameters shown 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 Name	Default Value (Single-node)	Default Value (Cluster)	Modified To (Cluster)
Partitions	1	3	5
Replicas	1	3	3
Aging Time	72 hours	72 hours	72 hours
Synchronous Replication	Disabled	Disabled	Disabled
Synchronous Flushing	Disabled	Disabled	Disabled
Message Timestamp	CreateTime	CreateTime	CreateTime
Max. Message Size	10,485,760 bytes	10,485,760 bytes	10,485,760 bytes