| /** |
| * 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.mapred; |
| |
| import java.util.Comparator; |
| |
| /** |
| * Order {@link JobInProgress} objects by priority and then by submit time, as |
| * in the default scheduler in Hadoop. |
| */ |
| public class FifoJobComparator implements Comparator<JobInProgress> { |
| public int compare(JobInProgress j1, JobInProgress j2) { |
| int res = j1.getPriority().compareTo(j2.getPriority()); |
| if (res == 0) { |
| if (j1.getStartTime() < j2.getStartTime()) { |
| res = -1; |
| } else { |
| res = (j1.getStartTime() == j2.getStartTime() ? 0 : 1); |
| } |
| } |
| if (res == 0) { |
| // If there is a tie, break it by job ID to get a deterministic order |
| res = j1.getJobID().compareTo(j2.getJobID()); |
| } |
| return res; |
| } |
| } |
