I've been playing around with a local copy of this branch, and am able to view 
graphs etc. with the backend data stored inside Cassandra.

There were a couple of issues, that I've hacked in a work around to get it 
working.


1.       When creating a definition, create an empty file so ResourceTypeUtils 
& ResponseTimeResourceType can list the available resources.

2.       When creating a graph, pass a Set object so we get a list of temporary 
files created to build the graph.

I've also added storing definition metadata into Cassandra, so that any 
temporary rrd created for graphs uses the datasource/archive definitions as 
defined inside the datacollection configs.

Other issues the branch needs work on:

1.       Does not work with storeByGroup=true

2.       Handle data aggregation/rollup for the RRA periods.


Is there going to be further development work on this branch?

Ron

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