What version are you using ? 

As of 1.1 off heap caches no longer require JNA https://github.com/apache/cassandra/blob/trunk/NEWS.txt#L327

Also the row and key caches are now set globally not per CF https://github.com/apache/cassandra/blob/trunk/NEWS.txt#L324


Aaron Morton
Freelance Cassandra Developer
New Zealand


On 1/03/2013, at 1:33 AM, Jason Wee <peichieh@gmail.com> wrote:

This happened sometime ago, but for the sake of helping others if they encounter, 

each column family has a row cache provider, you can read into the schema, for example : 

and row_cache_provider = 'SerializingCacheProvider'

it cannot start the cache provider for a reason and as a result, default to the ConcurrentLinkedHashCacheProvider.

the serializing cache provider require jna lib, and if you place the library into cassandra lib directory, then this warning should not happen again.