Users/active sessions limitation - 14.0 Web Viewer

Products

• Output Management Web Viewer

Issue/Introduction

Is there an active sessions limitation for Web Viewer 14.0? 
We want to leave Web Viewer 12.1 and 14.0 working in parallel in different LPARS and start preparing users for the switch to the new product, but at some point we will cut off DRAS. My concern is for Web Viewer 14.0 availability for a huge workload. I'm not sure if there is any need to have more than one active WebSphere liberty server per LPAR to support Web Viewer 14.0 and many users?

Environment

Release : 14.0

Component : Output Management Web Viewer

Resolution

The Web Viewer r14 API is RESTful API – meaning it’s only using server resources when processing an API request. The exception being an entry that is created in the active user table in the database when the user logs into Web Viewer r14. 

There is no coded limit to the number of users that are signed on to web Viewer r14 (each user will have an entry in the active user table in the database).

What comes into play is the number of users that are making an API request at the same time (from the UI that would be the number of users that are getting a repository list, report list, report data, etc. at the same time).

Of course the more users in total, the more likely you are to have a higher number of concurrent API requests.

Additional Information

For CCS Tomcat we document having a maximum number of threads of 250. There is nothing documented for WebSphere Liberty, but it would be in the same ballpark.

For web Viewer r14, a thread is used for an API request. Once the API request is complete that thread can be reused for the next API request. From the UI, an API request is made to fill in the information in the panels – for example, an API request is made to get the list of repositories, to get the list of reports, to get report data, etc. Once the UI has retrieved the information and displayed the panel there is no resource usage on the server side address space.

If there were about 100 active sessions per day under 12.1 and all 100 of those users now login to r14 - even if all 100 of those users hit enter in the Web Viewer r14 at the exact same time, that would still be well within the 250 ballpark.