garbage collection?

[benoitc]

You don't describe how you handle the garbage collection, can you give any hint on how you do it?

[dgrnbrg]

Sure! First of all, GC is a property of the backend, so that it can be optimized for the backend's performance characteristics (cheaper reads vs writes, cheaper point queries vs scans).

For the Redis backend, the GC is refcounting (there's a file in docs/ that goes into detail). For other backends, there's a new experimental tracing GC that avoids extra writes, and instead batches up the GC work.