Simple Message Queue (formerly MNS):FAQ

If you receive an error message when using Simple Message Queue (SMQ, formerly MNS), you can refer to Error codes to find a solution to the error. For other issues, you can refer to the following issue categories:

Introduction

• What is SMQ?

• How can I use SMQ?

• What are the scenarios of SMQ?

• What is the Account ID?

• What are the endpoints of SMQ in each region?

• What operations does SMQ provide?

• What are the limits of topics?

• Does SMQ support the long polling technique?

• Does SMQ support the FIFO method across queues?

• Can I use SMQ together with other Alibaba Cloud services?

• What are the benefits of SMQ compared with user-created, commercial, or open-source queue-based messaging services?

Billing

• Will I be billed for a deleted queue?

• Will I still be billed for a topic after I delete it?

Messages

• Why am I unable to receive messages after I create an SMQ subscription?

• What do I do if the error message "message not exist" appears when I delete a message in SMQ?

• How do I troubleshoot the issue that the HttpEndpoint operation fails to receive messages?

• Why does signature authentication fail when I call the HttpEndpoint operation?

• How do I improve the authentication performance when I use the HttpEndpoint operation?

• What do I do if I am unable to receive the HTTP body when I write the HttpEndpoint operation in PHP?

• What do I do if the error message "[Error Code]:InvalidRequestURL, [Message]:Http request URL format invalid" is returned by SMQ?

• How can I identify messages in SMQ?

• How does SMQ prevent message loss or repeated consumption when multiple consumer clients attempt to retrieve a message from a queue at the same time?

• How many times can each message be consumed?

• How do I extend the retention period of a message in SMQ?

• How do I increase the maximum size of a message in SMQ?

• What do the message count, number of messages visible, and number of messages delayed metrics indicate?

• Can I use SMQ to send or receive multiple messages at a time?

• Why is the number of messages returned by the BatchSendMessage API smaller than the number of visible messages in a queue?

Queues

• Do queues in different regions represent the same queue if the queues have the same name?

• Does SMQ delete a queue that has not been used for a long period of time?

SDKs

• How can I download SDKs?

• What do I do if the error message "[Error Code]:403 AccessDenied [Message]:The OwnerId that your Access Key Id associated to is forbidden for this operation" appears when an SDK is called?

APIs

• How do I use the SMQ API?

• How do I obtain the signature string of an API request?

• What do I do if the error message "403 SignatureDoesNotMatch" appears when I call an SMQ API operation?

• What do I do if the error message "[Error Code]:403 AccessDenied [Message]:The OwnerId that your Access Key Id associated to is forbidden for this operation" appears when an API is called?

Security

• How do I check whether the URL of a public key certificate is provided by Alibaba Cloud?

• Are messages in my queues secured?

• Is the data in SMQ reliable?