Optimizing event processing

See the original posting on DZone Python

During the RavenDB Days conference, I got a lot of questions from customers. Here is one of them.

There is a migration process that deals with event sourcing system. So we have 10,000,000 commits with 5 – 50 events per commit. Each event result in a property update to an entity.

That gives us roughly 300,000,000 events to process. The trivial way to solve this would be:
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