Duplication of messages.

[Ravi Chikkam]

We are using CQS to send and receive messages. Some times same message is sent twice with a different messageId.  I like to understand if others faced this problem and anyone planning on a fix.

[boriwo]

Do you mean the message is received twice or sent twice? Duplicate retrievals are ok per SQS API but should be rare and only occur in high concurrency scenarios when redis fails. Please provide some more details about your use case / test scenario so we can try reproduce this. Thanks!

[Ravi Chikkam]

We are sending some tasks across using CMB/CQS. The recipient is receiving same task via different message.

Now that I know duplication is possible, I will use task id for enforcing idem potency of requests.

[boriwo]

That's certainly a good idea - still I would be surprised if you get duplicates on a regular basis. Are you certain you have redis installed and cmb.properties configured to point to it? An excessive amount of duplicates is usually a sign of redis being down or not configured correctly in cmb.properties.