Major Description
At the moment aws-sqs producer does not support the new FIFO queue mechanism from AWS (FIFO-queues ref). There is a new parameter, MessageGroupId, that is required for FIFO queues (it is not available on Standard queues).
The message group ID is the tag that specifies that a message belongs to a specific message group. Messages that belong to the same message group are always processed one by one, in a strict order relative to the message group (however, messages that belong to different message groups might be processed out of order). Source: http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queue-recommendations.html#using-messagegroupid-property.
This improvement consists on adding support for MessageGroupId on the producer side of aws-sqs. It should be applicable on FIFO queues only. It could be customizable via URI options. A default strategy should be provided. This default strategy will generate a unique message group ID for each message to favor throughput and latency over ordering of messages.
