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Kinesis is not necessarily well-suited fan-out. It is very well suited for fan-in (single consumer, multiple producers).

Each shard allows at most 5 GetRecords operations per second. If you want to fan out to many consumers, you will reach those limits quickly and have to implement a significant latency/throughput tradeoff to make it work.

For API limits, see: https://docs.aws.amazon.com/kinesis/latest/APIReference/API_...