Amazon SQS increases the in-flight limit for FIFO queues from 20K to 120K messages. When a message is sent to an SQS FIFO queue, it is added to the queue backlog. Once you invoke a receive request on the FIFO queue, the message is now marked as in-flight and remains in-flight until a delete message request is invoked.
With this change to the in-flight limit, your receivers can now process a maximum of 120K messages concurrently, increased from 20K previously, via SQS FIFO queues. If you have sufficient publish throughput and were constrained by the 20K in-flight limit, you can now process up to 120K messages at a time by scaling your receivers.
The increased in-flight limits is available in all commercial and the AWS GovCloud (US) Regions where SQS FIFO queues are available.
To get started, see the following resources:
High-Throughput SQS FIFO queues, in the Amazon SQS Developer Guide
SQS FIFO queue quotas, in the Amazon SQS Developer Guide
Source:: Amazon AWS