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.