In-depth analysis of the command usage of Kafka topic creation process

Detailed explanation of the command to create a topic

A topic in Kafka is a logical grouping that groups related messages together. A topic can have messages written to it by producers and read from by consumers.

The command to create a topic is:

kafka-topics --create --topic <topic-name> --partitions <num-partitions> --replication-factor <replication-factor>

Where:

• <topic-name></topic-name> is the name of the topic.
• <num-partitions></num-partitions> is the number of partitions for the topic. A partition is a logical subset of a topic, and messages are evenly distributed among the partitions.
• <replication-factor></replication-factor> is the number of replicas of the topic. A replica is a backup of a topic, which improves the availability and fault tolerance of the topic.

For example, to create a topic named test with 3 partitions and 2 replicas, you can use the following command:

kafka-topics --create --topic test --partitions 3 --replication-factor 2

Command options

kafka-topics The command also provides some other options that can be used to control the topic creation behavior. These options include:

• --config <key></key>: Used to set the configuration properties of the theme. For example, you can use this option to set the topic's retention policy.
• --if-not-exists: If the topic already exists, do not create the topic.
• --verbose: Print detailed information about the topic creation process.

Examples

Here are some examples of creating topics:

• Create a topic called test topic with 3 partitions and 2 replicas:

kafka-topics --create --topic test --partitions 3 --replication-factor 2

• Create a topic named test with 5 partitions and 3 replicas, And set the retention policy of the topic to delete:

kafka-topics --create --topic test --partitions 5 --replication-factor 3 --config retention.ms=-1

• Create a topic named test with 3 partitions and 2 copy, and does not create the topic if it already exists:

kafka-topics --create --topic test --partitions 3 --replication-factor 2 --if-not-exists

Note

• Before creating the topic, you need to ensure that it has been started Kafka cluster.
• You can only create topics in an existing Kafka cluster.
• You cannot create a theme with the same name as an existing theme.
• Theme name can only contain letters, numbers and underscores.
• Theme name cannot start with a number.
• Theme name cannot exceed 255 characters.

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