AWS SQS & SNS Support
SQS FIFO throughput, message groups and ordering.
FIFO queues keep order, but only within a message group, and one failing message can block everything behind it in its group. Throughput depends on how many groups you use. We design group IDs and deduplication so you get the ordering you need without a bottleneck.
When You Need This
The situations where this work pays for itself.
Signs it is time
- A FIFO queue is slow, or consumers sit idle with messages waiting
- One bad message stops processing for many others
- You see rejected sends because of duplicate or missing parameters
- You need ordering per customer, order or device
- You are deciding whether FIFO is needed at all
What you get
- A group ID and deduplication design for each queue
- Queue and DLQ configuration in infrastructure as code
- Consumer changes for ordered, partial-failure handling
- A throughput test and alarms
How we do it
A clear, safe process you can follow along with.
1. Define what order really means
We identify the entity whose events must stay in order, such as an order, account or device, and use its ID as the MessageGroupId. Ordering is preserved only inside one group.
2. Avoid a single hot group
Using one constant group ID makes a FIFO queue process one message at a time. Many distinct group IDs allow parallel consumers while keeping per-entity order.
3. Handle deduplication
Each send needs a MessageDeduplicationId, or content-based deduplication must be enabled. Messages with the same ID inside the five-minute deduplication interval are accepted but not delivered again.
4. Enable high throughput mode if needed
High throughput FIFO uses per-message-group deduplication and throughput scope settings to raise limits. We check the current quotas for your Region and design group counts to use them.
5. Unblock a stuck group
While a message in a group is in flight or failing, later messages in that group are not delivered. We fix the consumer, use a DLQ with maxReceiveCount so poison messages move aside, and alarm on age of oldest message.
6. Tune the consumer
Concurrency is bounded by the number of active groups. For Lambda, batches contain messages from a group in order, and partial batch responses must stop at the first failure so order is preserved.
Mistakes we help you avoid
Common ways this goes wrong, and what we do instead.
One group ID for everything
Gives strictly serial processing and low throughput.
No DLQ
One poison message blocks its group indefinitely.
Random deduplication IDs
They defeat deduplication and allow duplicates on retry. Use a stable ID.
Choosing FIFO when order is not needed
A standard queue with idempotent consumers is simpler and scales further.
Frequently Asked Questions
Is SQS FIFO globally ordered?
No. Order is preserved only within a message group. Messages in different groups can be processed in parallel and in any relative order.
Why is my FIFO queue slow?
Usually too few message groups, a blocked group from a failing message, or throughput limits for the mode you use. Metrics and group design show which.
Can I convert a standard queue to FIFO?
No. FIFO is a separate queue type with a name ending in .fifo, so we create a new queue and migrate producers and consumers.
Want Help With SQS FIFO throughput, message groups and ordering?
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