SQS

SQS

Points to remember

• Scheduler uses delay queues and delayed messages.
• Delay queues make the messages send to them available to consumer after the specified delay(maximum 900 seconds or 15 minutes)
• Delayed messages are made available to consumers only after the specified delay.
• If the message is a delayed message and is sent to a delayed queue, then the message's delay takes preference and overrides the queue's delay. See example below.
• Maximum delay for messages is 900 seconds(15 minutes)

For eg: If the queue delay is 30 seconds and a message is sent with a delay of 45 seconds, it'll be available after 45 seconds(not 30 or 75 seconds). If the message is sent with a 15 seconds delay, message will be made available after 15 seconds(not 30 or 45 seconds)

Setting up SQS for Scheduler

• sqs.InitSQSRegions() must be called for both the consumer and publisher
• sqs.Setup() must be called once, preferably in the publisher. Setup will create the queues required.