PaaS Application

[vinomaster]

Explore creating 1 or even 2 PaaS Applications for existing PaaS systems like Heroku or CloudFoundry.

[nvd-ai]

What's the status of OCW's scalability? I am running a OCW server on Heroku. I have two main concerns:
1- What is a safe largest number of participants in a session that OCW can handle successfully without failing?
2- What happens when a heroku app is scaled up/down, e.g., number of running dynos increase/decreased? can this effect the current running OCW sessions and possibly disconnect the clients?

Are there some known issues regarding these questions?

[nvd-ai]

So far, I have found out that heroku does not support sticky sessions. Therefore, if OCW server uses in-memory sessions, this will be a problem for any number of dynos more than one, as Heroku load balancer randomly distributes the inbound requests among different dynos! This basically means scaling will not be possible on heroku.

I am running OCW's Java server on Heroku but I am not much of a Java Developer so I can't read OCW's Java code to see whether it requires sticky session or not to run correctly. Can you clarify this?

Source: Heroku Website

[Brian-P-Burns]

There would have to be some server work to make this horizontally scalable. Once a session is established with a server that client session must remain with that server as the session is kept in memory.