/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 org.apache.hadoop.hbase.master.balancer;
import java.util.Comparator;
import org.apache.hadoop.hbase.HRegionInfo;
/**
* The following comparator assumes that RegionId from HRegionInfo can represent
* the age of the region - larger RegionId means the region is younger. This
* comparator is used in balanceCluster() to account for the out-of-band regions
* which were assigned to the server after some other region server crashed.
*/
class RegionInfoComparator implements Comparator<HRegionInfo> {
@Override
public int compare(HRegionInfo l, HRegionInfo r) {
long diff = r.getRegionId() - l.getRegionId();
if (diff < 0) return -1;
if (diff > 0) return 1;
return 0;
}
}