Help Center/ Distributed Message Service for Kafka/ Drawer/ Buying an Instance/ AZ
Updated on 2025-06-19 GMT+08:00
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AZ

Parameter Explanation

  • Availability zone (AZ)

    An AZ is a physical region where resources use independent power supplies and networks. AZs are physically isolated but interconnected through an internal network.

    Each region contains multiple AZs. If one AZ is unavailable, the other AZs in the same region continue to provide services.

FAQs

How Do I Select an AZ?

When deploying resources, consider your applications' requirements on disaster recovery (DR) and network latency.

  • For high DR capability, deploy resources in different AZs within the same region.
  • For lower network latency, deploy resources in the same AZ.

Can I Change the AZ After Purchasing a Kafka Instance?

No.

Why Can't I Select Two AZs?

Each Kafka instance contains three ZooKeeper nodes. The ZooKeeper cluster manages Kafka instance configurations. If the ZooKeeper cluster is faulty, the Kafka instance cannot run properly. At least two ZooKeepers are required for the cluster to run properly.

Assume that you select only two AZs. AZ 1 has one ZooKeeper node, and AZ 2 has two. If AZ 1 is faulty, the instance can be used properly. If AZ 2 is faulty, the instance cannot be used. In this case, the availability rate of the Kafka instance is just 50%. Therefore, do not select 2 AZs.

Parent Topic: Buying an Instance