FifoJobComparator.java
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上传日期:2018-01-08
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- /**
- * 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) {
- res = j1.hashCode() - j2.hashCode();
- }
- return res;
- }
- }