make key cache preheating use less memory
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Key: CASSANDRA-2175
URL: https://issues.apache.org/jira/browse/CASSANDRA-2175
Project: Cassandra
Issue Type: Improvement
Affects Versions: 0.7.0 rc 3, 0.6.9
Reporter: Jonathan Ellis
Priority: Minor
Fix For: 0.6.12, 0.7.3
CASSANDRA-1878 pre-heats the key cache post-compaction so latency doesn't
suffer while warming the cache back up. This can double the memory used
temporarily; for a large key cache, this can have a substantial impact.
For now a boolean on/off is probably the best we can do. With
http://code.google.com/p/concurrentlinkedhashmap/issues/detail?id=21 though, we
could say "preheat the hottest X keys."
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