#AWS-SQS

• Amazon SQS is a web service that gives you access to a message queue that can be used to store messages while waiting for a computer to process them.

• Messages can contain up to 256 KB of text in any format such as json, xml, etc.

• Queue Types - Standard Queues, FIFO Queues

SQS

• SQS offers a standard queue as the default queue type.

• It allows you to have an unlimited number of transactions per second.

• It guarantees that a message is delivered at least once. However, sometime, more than one copy of a message might be delivered out of order.

• It provides best-effort ordering which ensures that messages are generally delivered in the same order as they are sent but it does not provide a guarantee.

FIFO

• It guarantees ordering

• The most important features of a queue are FIFO Queue and exactly-once processin

• FIFO Queue does not allow duplicates to be introduced into the Queue.

• It also supports message groups that allow multiple ordered message groups within a single Queue.

• FIFO Queues are limited to 300 transactions per second but have all the capabilities of standard queues.