hard20 pts · first answer countsmessagingscalability

FIFO queue backlog with idle workers

An SQS FIFO queue has a growing backlog while most of the 20 consumers sit idle. Every message is sent with MessageGroupId set to "orders". Why?

A.A single message group is processed in order, one message at a timeB.FIFO queues allow only one consumer process to poll at any timeC.Content-based deduplication must be enabled before scaling consumersD.The retention period is too short, so FIFO messages are held back

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FIFO queue backlog with idle workers

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