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We used to run an architecture similar to this a few years ago, I work for a broadcaster and unfortunately it failed badly during a big event.

The Kinesis stream was adequately scaled, but the poller between Kinesis -> Lambda just couldn't cope. This was discovered after lots of support calls with AWS.

It might be better these days I don't know, we moved to using Apache Flink + Apache Beam, which has a lot more features and allows us to do stuff like grouping by a window, aggregation etc.

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