SSTables in http://en.wikipedia.org/wiki/Page_cache maybe? How many rows do you have in this CF? Are you getting all columns?
What do the cassandra.db mbeans say ( hit ratio, cache requests, items etc ) regards, Andras On 27 Nov 2012, at 04:12, Yiming Sun <yiming....@gmail.com> wrote: > Hi, > > I am carrying out some performance test against a 6-node cassandra cluster > (v1.1.0), and need to disable the key cache entirely as one of the scenarios. > > However, by setting key_cache_size_in_mb to 0, I am still seeing caching > effects. For example, when I fetch a set of 5000 rows, the first time it > would deliver at about 60MB/sec, but all subsequent fetches (even after > fetching several other sets), it would deliver at about 120MB/sec. This is > exactly the same behavior I have observed when the key_cache_size_in_mb was > left blank. > > So I am just wondering how I can disable the key cache entirely. All our > nodes have JNA.jar deployed -- not sure it this has anything to do with what > I saw. Thanks. > > -- Y
