Help Center/ Distributed Message Service for RocketMQ/ User Guide/ Modifying RocketMQ Specifications
Updated on 2024-11-14 GMT+08:00
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Modifying RocketMQ Specifications

After creating a RocketMQ instance, you can increase its specifications. Table 1 lists available modification options for RocketMQ 4.8.0. Table 2 lists available modification options for RocketMQ 5.x.

Table 1 Specification modification options (RocketMQ 4.8.0)

Modified Object

Increase

Decrease

Broker quantity

√

×

Storage space

√

×

Broker flavor

√

×

After creating a RocketMQ 5.x instance, you can increase its specifications. Table 2 lists available modification options.

Table 2 Specification modification options (RocketMQ 5.x)

Modified Object

Increase

Decrease

Storage space (single-node)

√

×

Instance flavor (single-node)

×

×

Storage space (cluster)

√

×

Instance flavor (cluster)

√

√

Constraints

  • You can expand the storage space 20 times.
  • When brokers are added, the storage space is proportionally expanded based on the current disk space. For example, assume that the original number of brokers of an instance is 1 and the disk size of each broker is 300 GB. If the broker quantity changes to 2 and the disk size of each broker is still 300 GB, the total disk size becomes 600 GB.
  • rocketmq.4u8g.cluster.small does not support broker flavor increase.

Prerequisites

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

Procedure

  1. Log in to the 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 Middleware > Distributed Message Service for RocketMQ to open the console of DMS for RocketMQ.
  4. Modify the instance specifications in either of the following ways:

    • Locate 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. Configure the broker expansion as required.

    • RocketMQ 4.8.0: Specify the required storage space, broker quantity, or broker flavor.
      • Expand the storage space.

        For Change 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 Change 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 Flavor column in the instance list.

        • Before adding brokers, ensure that the network segments allowed in the security group and the instance ports allowed externally are available. The allowed network segments are the subnet used by the instance. The allowed ports: 10100–(10100 + 3 × n - 1) (n is the number of brokers).
        • Adding brokers does not affect the original brokers or services.
        • If public access is enabled and EIPs are configured for the instance, configure EIPs for the new brokers.
      • Increase the broker flavor.

        For Change By, select Broker Flavor. Then, select a new flavor and click Next. Confirm the configurations and click Submit.

        View the broker flavor in the Flavor column of the instance list.

        Increasing the broker flavor will interrupt the instance for about one minute. If the production TPS is high during the change, the change may fail. To prevent this from happening, add brokers first.

    • RocketMQ 5.x: Specify the required storage space or instance flavor.
      • Expand the storage space.

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

        View the new storage space 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.

      • Increase the instance flavor.

        For Modify By, select Flavor. Then, select a new flavor and click Next. Confirm the configurations and click Submit.

        View the new flavor in the Flavor column of the instance list.

        Before scaling the instance, ensure that the subnet segments are allowed in the security group.