This topic provides answers to some commonly asked questions about ApsaraMQ for RocketMQ.
FAQ about features
- What are the advantages of ApsaraMQ for RocketMQ 5.0 instances over ApsaraMQ for RocketMQ 4.0 instances?
- What client versions are ApsaraMQ for RocketMQ 5.0 instances compatible with?
- What SDKs do ApsaraMQ for RocketMQ instances support?
- How do I enable the Internet access feature for ApsaraMQ for RocketMQ instances?
- What are the differences between ordered messages and normal messages?
- Where do I obtain the credentials that are required to connect to an ApsaraMQ for RocketMQ broker?
- Are limits imposed on the number of tags that I can subscribe to in ApsaraMQ for RocketMQ?
- What are the differences between the clustering consumption mode and the broadcasting consumption mode in ApsaraMQ for RocketMQ?
- How are messages consumed when multiple consumer groups subscribe to the same topic?
- What is the maximum size of a message body in ApsaraMQ for RocketMQ?
- What is the retention period for messages in ApsaraMQ for RocketMQ?
- What load balancing policies are provided by ApsaraMQ for RocketMQ?
- Are messages retried after they fail to be consumed?
- Is the broadcasting consumption mode supported by ApsaraMQ for RocketMQ 5.0 instances?
- What is the maximum scheduled time that can be specified to send scheduled messages in ApsaraMQ for RocketMQ?
- What are the limits on the number of topics and groups?
FAQ about client connections
Why does the "signature validate by dauth failed" error occur during client connection?
Why does the "TimeoutException" error occur during client connection?
Why is the "valid resource owner failed" error returned by the client?
Why is the "MQClientException: No route info of this topic" returned by the client?
Why is the "FETCH_TOPIC_ROUTE_FAILURE" error returned by the client?
Why is the "CODE: 25 DESC: the consumer's subscription not latest" error returned by the client?
FAQ about sales, billing, and instance upgrades and downgrades
Why am I charged even though I did not send or receive messages?
How do I downgrade an Enterprise Platinum Edition instance to a Standard Edition instance?
If I delete a topic on an ApsaraMQ for RocketMQ 4.x instance, am I charged for the topic that day?
How do I change the VPC with which an ApsaraMQ for RocketMQ 5.x instance is associated?