>  - A Cassandra node (say 3) goes down (even with 24 GB of ram, OOM errors
> are the bain of my existence)

Following up on this bit; OOM should not be the status quo. Have you
tweaked JVM heap sizes to reflect your memtables sizes etc?

http://wiki.apache.org/cassandra/MemtableThresholds

-- 
/ Peter Schuller

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