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- Amazon SQS is a hosted queue service
- Secure, Durable, Scalable and Reliable
- Facilitates integration of components
- No upfront cost.
- 1 Million free monthly requests.
- Message size can be upto 256KB.
- Default message retention period is 4 days. Can be modified to retain upto 14 days.
- Supports Delay Queue – You can set ‘Delivery delay’ of upto 15 minutes. Default is 0 seconds.
- Supports Dead Letter Queue – Failed messages can be sent to a dead letter queue.
- Visibility Timeout – Default is 30 seconds. Can be configured to a maximum of upto 12 hours. Message becomes invisible for other consumers after it is picked up by 1 consumer. If the message is not processed within the visibility timeout, message becomes visible again for other consumers to pick it up.
- Pull based. Not push based.
- Supports Server-Side Encryption.
- Stores messages on multiple servers for durability and availability.
- All the messages in a queue can be deleting by purging the queue.
- 2 Types of Queues
- Standard Queue
- Default queue type
- Messages are delivered atleast once and sometimes more than once
- Throughput is unlimited transactions per second.
- Message sent order and Delivery order might be different
- FIFO Queue
- Throughput is upto 300 API Calls per second.
- Supports batching – Each Batch can contain upto 10 messages
- Thus throughput is upto 3000 messages per second
- Message is delivered only once
- Messages are delivered in the same order that they are sent.
- 2 Types of polling
- Short Polling
- Returns data immediately
- ReceiveMessageWaitTimeSeconds is 0
- Long Polling
- Enabled at Queue level.
- Lower cost.
- ReceiveMessageWaitTimeSeconds is greater than 0 and upto 20 seconds.
- Queue Attributes
- DelaySeconds
- MaximumMessageSize
- MessageRetentionPeriod
- Policy
- ReceiveMessageWaitTimeSeconds
- RedrivePolicy
- deadLetterTargetArn
- maxReceiveCount
- VisibilityTimeout
- ContentBasedDeduplication (FIFO only)
- MessageDeduplicationId
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