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How does the CRM Async Service retrieve data from the database

Can anyone confirm the mechanism that the CRM Async Service uses to access CRM data when running on premise with the Async and Sandbox Service running on the back end servers?

I have always believed that the backend service used the OrganizationWebService on the front end servers for data access and therefore any full trust (unisolated) plugins that get triggered by an Async Service org service request would execute on the front end server.

However, we are seeing evidence that makes it look like the Async Service connects to some OrganizationWebService container on the same backend server and that the plugins execute in that unisolated plugins execute in that context which displays in the local error logs as MSCRMWebService.

I don't see any definitive documentation. I'm running v8.1 on premise.

Any insights appreciated!

Thanks, Scott

If you have plugin code (plugins or custom workflow assemblies), that runs either asynchronously, or in the sandbox, then they will run on the back end server(s), as that's where the async and sandbox processes run.

I've not seen definitive documentation on this, but my understanding is that, if the plugin derives the IOrganizationService instance from the context passed into the plugin, then this will not need to do back to the OrganizationWebService on the front end server, and instead uses a local OrganizationWebService container. However, if you create the IOrganizationService instance by other means (e.g. OrganizationServiceProxy), then this would go to the OrganizationWebService on the front end server

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