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h2. How to perform upgrade for services with FIFO requirements (downtime)

*Text below is not always true. With the introduction of services such as SQS FIFO Queues rolling upgrades with multiple nodes may still work if your setup is correct.*
Due to FIFO-requirements, some applications must be stopped prior to updating. Set desired count to 0, and wait until it has shut down. Then reset the desired count to 1.
This will ensure strict FIFO, at the cost of downtime.