ApsaraMQ for Kafka no longer sells instances based on topic specifications. If you have an existing topic-based instance, the following quotas apply.
Quota overview
The following table summarizes the resource quotas for topic-based instances.
| Resource | Quota | How it scales |
|---|---|---|
| Topics | Varies by traffic specification. Professional Edition allows up to 2x the purchased topic count. | Determined by traffic specification |
| Groups | Up to 2x the purchased topic count | Scales with purchased topics |
| Partitions | Base count from traffic specification | +16 partitions per additional purchased topic |
Topic quotas
The maximum number of topics or partitions varies based on your traffic specification.
For Professional Edition instances, the topic limit is twice the purchased topic count. For example, purchasing 50 topics allows up to 100 topics.
Group quotas
The group limit is twice the purchased topic count. For example, purchasing 50 topics allows up to 100 groups.
Partition quotas
Each instance has a base partition count determined by its traffic specification. When you purchase additional topics, partitions increase at a 1:16 ratio -- each additional topic adds 16 partitions.
Formula:
Total partitions = Base partitions + (Additional topics x 16)Example:
A Standard Edition (High Write) instance with the 2xlarge traffic specification has 50 topics, a maximum traffic rate of 20 Mbit/s, and 400 base partitions. If you purchase 10 additional topics:
Additional partitions: 10 x 16 = 160
Total partitions: 400 + 160 = 560