How does erasure coded data work with the concept of regions?
- It doesn't
- Cross-region replicate the chunks
- Increase the parity bits for each region
A nice goal would be for a remote region to help participate in rebuilding EC objects if that cannot be done in the local region.
Generally, erasure coding shouldn't be attempted when a low-latency WAN traversal is required (ie regions). All EC data for an object (or enough to rebuild the object) should be stored in a single region.