using grails flash object and load balancing

Question

In our application we have used flash object to transport data from one controller to another by grails redirect(). Does it pose any loss of data/threat since our application is using load balancing and non-sticky sessions (we are using memcached for our own session management mechanism) ? I read the grails doc says it "stores objects within the session for the next request and the next request only" ? Does it mean flash is actually using session in the background ?

Answer 1

Yep, you're absolutely right. Flash uses the http session to store stuff so if you're using a load balancer without sticky sessions you shouldn't use flash scope.