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Description
I am exploring how to implement distributed collections for objects in Orleans. I imagine this functionality could be useful for a few scenarios, e.g.
- Scale existing systems with lots of code that cannot be completely reimplemented in grains.
- Hold and query large collections on the server side which reduces load on a client.
- Querying collections of grains, maybe in combination with index building [2].
So far I have identified the following main goals important for my Orleans-based project:
- Introduce some parallelism for list operations by using a large number of ContainerGrains hosting items.
- Exact storage location of items should not be dealt with by the user (not completely implemented).
- Allow efficient communication between objects hosted within a distributed collection (not implemented).
- Support LINQ-like queries on such a collection (way to go).
I implemented a prototype with some very limited functionality of distributed collections and would be happy to discuss its approaches [1].
I would like to hear what your requirements for a distributed collection are. Is it interesting to you to deal with not only collections of grains but collections of plain old objects as well? Do you care about consistency a lot?
Deprecated [1] https://github.com/bwanner/Orleans.Collections [2] Related issue: https://github.com/dotnet/orleans/issues/602
Update: See https://github.com/dotnet/orleans/issues/1412#issuecomment-193702118 for latest update on concept and implementation status.