doc-exports/docs/dms/umn/kafka-ug-0006.html

Changing Partition Quantity

After creating a topic, you can increase the number of partitions based on service requirements.

Changing the number of partitions does not affect services.

Methods for changing the partition quantity:

• Method 1: By Using the Console
• Method 2: By using Kafka CLI

Method 1: By Using the Console

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

   Select the region where your Kafka instance is located.

3. Click Service List and choose Application > Distributed Message Service. The Kafka instance list is displayed.
4. Click the desired Kafka instance to view the instance details.
5. Click the Topics tab.
6. Modify the number of partitions using either of the following methods:
   • Select one or more topics and click Edit Topic in the upper left corner.
   • In the row containing the desired topic, click Edit.

7. In the Edit Topic dialog box, enter the number of partitions and click OK.
   

   • The number of partitions can only be increased.
   • To ensure performance, the Kafka console allows a maximum of 100 partitions for each topic.
   • The total number of partitions of all topics cannot exceed the maximum number of partitions allowed by the instance.

Method 2: By Using Kafka CLI

If your Kafka client version is later than 2.2, you can use kafka-topics.sh to change the partition quantity.

• If SASL is not enabled for the Kafka instance, run the following command in the /{directory where the CLI is located}/kafka_{version}/bin/ directory to change the partition quantity:

  ./kafka-topics.sh --bootstrap-server {broker_ip}:{port} --topic {topic_name} --alter --partitions {partition_num}

• If SASL has been enabled for the Kafka instance, perform the following steps to change the partition quantity:
  1. (Optional) If the SSL certificate configuration has been set, skip this step. Otherwise, perform the following operations:

     Create the ssl-user-config.properties file in the /config directory of the Kafka client and add the SSL certificate configurations by referring to 3.

  2. Run the following command in the /{directory where the CLI is located}/kafka_{version}/bin/ directory to change the partition quantity:

     ./kafka-topics.sh --bootstrap-server {broker_ip}:{port} --topic {topic_name} --alter --partitions {partition_num} --command-config ./config/ssl-user-config.properties 

Parent topic: Managing Topics