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

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Release: 2024-02-01 08:35:05
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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>
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Where:

  • <topic-name> is the name of the topic.
  • <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> 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
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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=value>: 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
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  • 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
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  • 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
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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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