Hey all,
Just wanted to give an update on my hacking on the
features/cassandra-rrd-backend branch.
One of the problems I'd noticed with the CassandraRrdStrategy was that
it kept creating temp files as it created graphs. I had created a pool
of files to get around this, but it was kind of hackish.
I've now solved this problem in a much better way.
The JRobin API lets you pass a definition for a datasource, and send the
data { timestamps + values } as part of the graph definition. So now
when the strategy class retrieves the timestamps+values from cassandra,
it stores them in a org.jrobin.data.LinearInterpolator object and we
don't have to worry about temp files any more.
Woot!
Things that still need work:
1. storeByGroup/storeByForeignSource handling.
2. fix fetchLastValue() and fetchLastValueInRange().
3. Periodic data point aggregation for all data sources.
4. Performance stress test
Ron
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