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  *      Copyright (C) 2012 DataStax Inc.
  *   Licensed under the Apache License, Version 2.0 (the "License");
  *   you may not use this file except in compliance with the License.
  *   You may obtain a copy of the License at
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
package com.datastax.driver.core;

The distance to a Cassandra node as assigned by a com.datastax.driver.core.policies.LoadBalancingPolicy (through its distance method). The distance assigned to an host influences how many connections the driver maintains towards this host. If for a given host the assigned HostDistance is LOCAL or REMOTE, some connections will be maintained by the driver to this host. More active connections will be kept to LOCAL host than to a REMOTE one (and thus well behaving LoadBalancingPolicy should assign a REMOTE distance only to hosts that are the less often queried).

However, if a host is assigned the distance IGNORED, no connection to that host will maintained active. In other words, IGNORED should be assigned to hosts that should not be used by this driver (because they are in a remote datacenter for instance).

public enum HostDistance {
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