Modifying Specifications

Scenario

After creating a RocketMQ instance, you can expand its storage space and increase the number of brokers. The storage space and the number of brokers can only be changed separately.

The specifications can only be expanded. You can expand the storage space 20 times. If you increase the number of brokers, the maximum number of partitions will also be increased.

Prerequisites

A RocketMQ instance has been created and is in the Running state.

Procedure

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

   Select the region where your RocketMQ instance is located.

3. Click and choose Application > Distributed Message Service (for RocketMQ) to open the console of DMS for Kafka.
4. Modify the instance specifications using either of the following methods:
   • In the row containing the desired instance, click Modify Specifications.
   • Click a RocketMQ instance to go to the instance details page. In the upper right corner, click Modify Specifications.

5. Specify the required storage space or the number of brokers.
   The storage space and the number of brokers can only be changed separately.

   • Expand the storage space.

     For Modify By, select Storage. For Storage Space per Broker, specify a new storage space, and click Next. Confirm the configurations and click Submit.

     View the new storage space (Storage space per broker x Number of brokers) in the Used/Available Storage Space (GB) column in the instance list.

     

     • Storage space expansion does not affect services.
     • Available storage space = Actual storage space – Storage space for storing logs – Disk formatting loss

       For example, if the storage space is expanded to 700 GB, the storage space for storing logs is 100 GB, and the disk formatting loss is 7 GB, then the available storage space after capacity expansion will be 593 GB.

   • Add brokers.

     For Modify By, select Brokers. Then, enter the number of brokers and click Next. Confirm the configurations and click Submit.

     View the number of brokers in the Specifications column in the instance list.

     

     • Adding brokers does not affect the original brokers or services.
     • Only new topics are created on new brokers. The original topics are still on the original brokers. To use the new brokers, associate them with existing topics or create new topics.
     • If public access is enabled and EIPs are configured for the instance, configure EIPs for the new brokers.