Consider removing DowngradingConsistencyRetryPolicy
DowngradingConsistencyRetryPolicy has a few non-obvious usability issues (i.e. , ). There are also some good arguments in CASSANDRA-7642 against it, people on both sides of that discussion in particular agree that DowngradingConsistencyRetryPolicy provides little to no value.
The policy will not be ported to 4.0.