AWS - Simple Queue Service

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058.mp4 – SQS Overview

  • up to 10 attributes can be add to a message

  • Size 1 - 256 K

  • Standard usage : provide cloudwatch metric (queue depth) to help auto Scaling

  • Queue type

    • Standard queue
    • FIFO (Max 300TPS, exact once) ; not available in all regions

  • Message Lifecycle (Visibility Timeout)

  • Dead Letter Queue : must be in same region under same account with the source queue

  • Delay Queue

    • Define “DelaySeconds”
    • max inflight msg = 120000

  • Message Timers : individual message being available with a delayed manner. set “DelaySeconds” for individual message

  • Two type of polling

    • short polling : 有消息吗？服务器答： 有/没有
    • Long polling: 有消息吗， 20秒内有消息回我，我等着。 服务器：好的。
      • long polling减少无效的空返回 and false empty response (subset of servers)
      • set “WaitTimeSeconds” 1~20 second

How the “DelaySeconds” change affect existing Message (different behavior for Standard and FIFO)
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-delay-queues.html

Delete the Queue : what happens to existing Message
https://docs.aws.amazon.com/cli/latest/reference/sqs/delete-queue.html

Message Retention & Visiblity timeout
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-limits.html

Short Pooling definition : (Subset of servers)
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long-polling.html

Queue identifier (format)

https://sqs.us-east-2.amazonaws.com/123456789012/MyQueue

https://sqs.regionname.amazonaws.com/accountnumber/queuename.uniqueforuser[.fifo]
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-general-identifiers.html

Message ID vs Receipt Handle
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-general-identifiers.html

How to check queue Depth (GetQueueAttributes & ApproximateNumberOfMessages)
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_GetQueueAttributes.html

Dead letter queue limitations (origional queue type impact dead letter queue type; region & account limitation)
FIFO queue’s dead letter queue will also be FIFO
Dead letter queue sits in same region with original queue
Dead letter queue must being created by same account of the original queue
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-dead-letter-queues.html

Cloudwatch integration with SQS (how often metrics are pushed; how to tell if a queue is active; no charge; support all queue types)
Every 5 min
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-monitoring-using-cloudwatch.html

Integration with CloudTrail (what will be loged)
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/logging-using-cloudtrail.html

Message Visiblity Range
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_ChangeMessageVisibility.html

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