Deprecate or modify per-cf memtable sizes in favor of the global threshold
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Key: CASSANDRA-2449
URL: https://issues.apache.org/jira/browse/CASSANDRA-2449
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Stu Hood
Fix For: 0.8
The new memtable_total_space_in_mb setting is an excellent way to cap memory
usage for memtables, and one could argue that it should replace the per-cf
memtable sizes entirely. On the other hand, people may still want a knob to
tune to flush certain cfs less frequently.
I think a best of both worlds approach might be to deprecate the
memtable_(throughput|operations) settings, and replace them with a preference
value, which controls the relative memory usage of one CF versus another (all
CFs at 1 would mean equal preference). For backwards compatibility, we could
continue to read from the _throughput value and treat it as the preference
value, while logging a warning.
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