Download remote execution service

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For example, suppose you want to execute a script that needs three R packages, a reference data file, and a model object. Instead of loading the data file and object each time you want to execute the script, create a session snapshot of an R session containing them. Then, you can save time later by retrieving this snapshot using its ID to get the session contents exactly as they were at the time the snapshot was created.

However, any necessary packages must be reloaded as described in the next section. The following functions are available for working with snapshots: listSnapshots , createSnapshot , loadSnapshot , downloadSnapshot , and deleteSnapshot. One caveat is that while the workspace is saved inside the session snapshot, it does not save loaded packages. If your code depends on certain R packages, use the require function to include those packages directly in the R code that is part of the web service.

The require function loads packages from within other functions. For example, you can write the following code to load the RevoScaleR package:. While you can use snapshots when publishing a web service for environment dependencies, it can have an impact on performance at consumption time.

For optimal performance, consider the size of the snapshot carefully especially when publishing a service. Before creating a snapshot, ensure that you keep only those workspace objects you need and purge the rest. And, if you only need a single object, consider passing that object alone itself instead of using a snapshot. After you understand the mechanics of remote execution, consider incorporating web service capabilities. You can publish an R web service composed of arbitrary R code block that runs on the remote R Server.

For more information on publishing services, begin with the Working with web services in R guide. Then, publish your service. Use resume from your local prompt to return to the command line in the remote R session. Authenticate again from within the remote session to enable connections from that remote session to the web node API. When attempting to log in from a remote session, you are not prompted for user credentials. Instead, pass valid values for username and password to this function.

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