Prevent Duplicate Messages in MQ

There are several methods available to prevent duplicate data consumption in MQ.

1. Use a unique identifier for messages: When a producer sends a message, add a unique identifier to each message so that consumers can determine if the message has already been processed upon receiving it. If it has been processed, it can be skipped to avoid duplicate handling.
2. Utilize message idempotence: By ensuring that the processing logic for handling messages is idempotent, we guarantee that no matter how many times the same message is processed, the end result will always be the same. This way, even if messages are consumed repeatedly, data errors will not occur.
3. Utilizing a duplicate table for messages: Create and maintain a table where unique identifiers for processed messages are recorded. Upon receiving a message, the consumer first checks this table. If the message already exists in the duplicate table, it is skipped; otherwise, the message is processed and its unique identifier is added to the table.
4. Incorporating a message confirmation mechanism in the message queue: after a consumer finishes processing a message, they send a confirmation message to the message queue to indicate that the message has been processed, allowing the queue to mark it as consumed and prevent duplicate processing.