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Viya

SAS Viya is the new kid on the block and the future for the SAS platform. It has a blazingly fast in-memory, scalable architecture and is built with developers in mind.

Here are some relevant tips & tricks to help from an app-development perspective.

Server Restart

This is necessary after configuring settings such as whitelisting. Log onto the box as an admin and execute the following commands:

sudo /etc/init.d/sas-viya-all-services stop
sudo /etc/init.d/sas-viya-all-services start

Shared Account and Server re-use

Server pooling and the use of a shared OS account are both possible from Viya 3.5 - the documentation is here (and communities articles are available here and here)

Compute setup

Log onto the box and navigate to /opt/sas/viya/home/bin. To create your profile (if you haven't done this already) run ./sas-admin profile init.

Then, ./sas-admin auth login to authenticate. Next, ./sas-admin compute credentials create and use the credentials you would like the new compute context to use (the equivalent of the SAS 9 sassrv account).

To validate, you should see these creds on the /credentials/domains?start=10 endpoint.

Now run the following command: sudo systemctl restart sas-viya-runlauncher-default

Next up, log onto SASEnvironment Manager (as admin user), Contexts, View Compute Contexts. You can either create a new profile, or modify the existing "SAS Job Execution compute context".

Scroll down and add the following attribute / value pairs:

Status Attribute Value
Mandatory runServerAs the user id we used in the ./sas-admin compute credentials create step above
Mandatory reuseServerProcesses true
Optional serverInactiveTimeout Time in seconds before the server times out. Will otherwise time out when there are no active sessions. Default is 600 (10 mins). We recommend 1800 or longer.
Optional allowXCMD true or false
Optional unsafeJobCharacters Contains the characters that the compute session should remove from any variable that is provided to a job for execution. By default, the following characters are removed: & (ampersand), ” (double quotation mark), ; (semicolon), ’ (single quotation mark), and % (percent sign). If set to "" the feature is disabled.

With this feature enabled, your end user ID will be SYS_COMPUTE_SESSION_OWNER instead of SYSUSERID.

Note - a server restart is not required.

REST APIs

The REST APIs are available here: https://developer.sas.com/apis/rest/.

When navigating the APIs, the returned JSON can be quite difficult to read: compute before

Fortunately, plugins are available for chrome and firefox that can give you "prettified" JSON, like so:

compute after