Cassandra code. Mutate all the things!

cassandra.java

public List<InetAddress> filterForQuery(Keyspace keyspace, List<InetAddress> liveEndpoints, ReadRepairDecision readRepair)
    {
        /*
         * Endpoints are expected to be restricted to live replicas, sorted by snitch preference.
         * For LOCAL_QUORUM, move local-DC replicas in front first as we need them there whether
         * we do read repair (since the first replica gets the data read) or not (since we'll take
         * the blockFor first ones).
         */
        if (isDCLocal)
            Collections.sort(liveEndpoints, DatabaseDescriptor.getLocalComparator());