For me, it meant I don't know of any error before instantiation time. I am not really particular about this change. That said, I don't like the log sampling logic either. 
https://github.com/lakshmi-kannan/blueflood/blob/b0ca91343d705eff092a92bc7b9906393d9dad81/blueflood-core/src/main/java/com/rackspacecloud/blueflood/cache/TtlCache.java#L139