CODEWITHSUNDEEP
orleans
Phillip Scott Givens
Phillip Scott Givens

Reputation: 5464

MSR Orleans, How does PlacementStrategy work?

In Orleans, how do the PlacementStrategy’s work? I see that there are several implementations of the PlacementStrategy including RandomPlacement, PreferLocalPlacement, ActivationCountBasedPlacement and StatelessWorkerPlacement.

I have a few question from how to use these to how are they implemented? How do I specify that a call should be Prefer-Local vs RandomPlacement?

I am looking through the code and I do not see the code which chooses one execution path versus another based on these placement strategies. Where does that happen?

Upvotes: 1

Views: 816

Answers (1)

Gabi Kliot
Gabi Kliot

Reputation: 1373

There are more details by Richard here: http://richorama.github.io/blog/2015/01/02/grain-placement-in-orleans/ We should, and will, move this into our docs here on github.io.

How to use: add an attribute [PreferLocal] on the grain class.

The code: https://github.com/dotnet/orleans/blob/master/src/OrleansRuntime/Core/Dispatcher.cs#L555

SelectOrAddActivation(..., strategy) forwards to the specific placement director, based on the specified placement policy.

Upvotes: 5

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