// Explains Dead Letter Queue + bad event handling + blocking
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https://stackoverflow.com/questions/32501985/amazon-kinesis-aws-lambda-retries
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https://aws.amazon.com/blogs/compute/amazon-kinesis-firehose-data-transformation-with-aws-lambda/
// You set the amount of events(batchsize) + guarantees of concurrency per shard+ plus key only active in 1 shard at the time