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DMS: Improve performance by processing in parallel #122

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@amotl

Thoughts

Because a standard Kinesis stream uses four shards by default, and because we have been able to work around a serialization order flaw per #101 (comment), it would be nice to consume events from those four shards (or more) in parallel, to speed up data loading.

It looks like the async-kinesis package we are using for tapping into a Kinesis stream works well for this purpose of coordinating multiple consumers.

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