This is a feature of MongoDB clusters, it creates a rotating log of all the operations done in the database. Meteor requires this feature to ensure the syncing between the instances of a common application. Otherwise the framework would use polling everythin 10 seconds which results in really slow syncing compared to the ‘real time’ point of view.
Meteor is not completely a stateless service, some pieces of information are stored in an instance of the application. That is why we added this feature to our load balancers.
When your application is using Meteor and is using more than one ‘web’ containers, this is automatic, a given user session will be routed to the same instance during the next hour.
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Of course we support NodeJS with other frameworks like Express, MEAN.JS as well.