code: public static void adjustPoolSettings(int maxConnsInPool, int maxBrokerConns, int maxCoordConns, int maxOverlordConns) {
          MAX_CONNS_IN_POOL = maxConnsInPool;
          MAX_BROKER_CONNS = maxBrokerConns;
          MAX_COORD_CONNS = maxCoordConns;
          MAX_OVERLORD_CONNS = maxOverlordConns;
          DruidNodeAccessor.setMaxConnections(MAX_CONNS_IN_POOL);
      }
docs: Call if a custom pool size, and fine grained control on connections per route.
  NOTE: This must be called prior to instantiating DDataSource for the settings
  to be effective.
  @param maxConnsInPool
  @param maxBrokerConns
  @param maxCoordConns
  @param maxOverlordConns