Hi, I have a question about cassandra 1.1 Just wanted to confirm if key_cache_size_in_mb is the maximum amount of memory that key cache will use in memory? If not, what is it?
My observations: With key cache disabled, I started cassandra. I invoked Full GC through jconsole a couple of times just to make sure that memory is freed up. Total heap memory in use is 2.2 gigs. I have almost 550 million keys, so this looked reasonable as the bloom filter itself is around 1 gig. I enabled key cache again by making key_cache_size_in_mb to a value 800. This would lead cassandra to load a previously saved key cache file of size 98 mb on disk. I restarted cassandra again. This time the heap size increased to 4.2 gigs. I checked the cache sizing in jconsole. KeyCacheCapacityInMb: 799 KeyCacheSize: 410,316,048 This says that the key cache size is 410 mb. However the increase in the heap is 2 gigs. Doesnt add up!! Can anyone explain this? Thanks Gurpreet
