this is more of a feature request, really.
Is caching or saving of received templates on the roadmap? I have a situation where I've had to restart the collector after I've started receiving flows. The collector doesn't handle this well so I need to restart the Netflow export on the Cisco ASA for the templates to be re-sent.
By default Cisco ASA exports templates every 30 minutes. Changing it to every minute could be a good workaround (we were recommending it to our customers before we implemented template persistence).
See "Configure Template Timeout Intervals" here for more information. http://www.cisco.com/c/en/us/td/docs/security/asa/special/netflow/guide/asa_netflow.html