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Realtime crowd map? #70

@adayoung

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@adayoung

Hi! Is there any interest in a realtime crowd mapping system? I was reading about how database replication works and I figured hey that crowdmap could be doing this! Here's how I think it works:

  1. The mapping efforts generate a transaction log of what changes need to change in the map db
  2. This log goes in a central (append only?) database or log storage
  3. A client retrieves this log and plays it to generate a local map db
  4. For updating, the same client requests logs newer than what they already have; playing through it updates their db
  • The central log database occasionally does a full scan and drops older entries that are no longer necessary

It's a very rough idea! Thoughts, anyone?

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