[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.mapred; |
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| 19 | |
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| 20 | import java.io.IOException; |
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| 21 | import java.util.ArrayList; |
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| 22 | import java.util.Collection; |
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| 23 | import java.util.HashMap; |
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| 24 | import java.util.List; |
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| 25 | import java.util.Map; |
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| 26 | |
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| 27 | import junit.framework.TestCase; |
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| 28 | |
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| 29 | import org.apache.hadoop.io.BytesWritable; |
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| 30 | |
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| 31 | public class TestJobQueueTaskScheduler extends TestCase { |
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| 32 | |
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| 33 | private static int jobCounter; |
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| 34 | private static int taskCounter; |
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| 35 | |
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| 36 | static void resetCounters() { |
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| 37 | jobCounter = 0; |
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| 38 | taskCounter = 0; |
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| 39 | } |
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| 40 | |
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| 41 | static class FakeJobInProgress extends JobInProgress { |
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| 42 | |
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| 43 | private FakeTaskTrackerManager taskTrackerManager; |
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| 44 | |
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| 45 | public FakeJobInProgress(JobConf jobConf, |
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| 46 | FakeTaskTrackerManager taskTrackerManager) throws IOException { |
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| 47 | super(new JobID("test", ++jobCounter), jobConf); |
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| 48 | this.taskTrackerManager = taskTrackerManager; |
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| 49 | this.startTime = System.currentTimeMillis(); |
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| 50 | this.status = new JobStatus(getJobID(), 0f, 0f, JobStatus.PREP); |
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| 51 | this.status.setJobPriority(JobPriority.NORMAL); |
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| 52 | this.status.setStartTime(startTime); |
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| 53 | } |
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| 54 | |
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| 55 | @Override |
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| 56 | public synchronized void initTasks() throws IOException { |
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| 57 | // do nothing |
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| 58 | } |
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| 59 | |
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| 60 | @Override |
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| 61 | public Task obtainNewLocalMapTask(TaskTrackerStatus tts, int clusterSize, |
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| 62 | int ignored) |
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| 63 | throws IOException { |
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| 64 | return obtainNewMapTask(tts, clusterSize, ignored); |
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| 65 | } |
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| 66 | |
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| 67 | @Override |
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| 68 | public Task obtainNewNonLocalMapTask(TaskTrackerStatus tts, int clusterSize, |
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| 69 | int ignored) |
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| 70 | throws IOException { |
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| 71 | return obtainNewMapTask(tts, clusterSize, ignored); |
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| 72 | } |
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| 73 | |
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| 74 | @Override |
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| 75 | public Task obtainNewMapTask(final TaskTrackerStatus tts, int clusterSize, |
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| 76 | int ignored) throws IOException { |
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| 77 | TaskAttemptID attemptId = getTaskAttemptID(true); |
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| 78 | Task task = new MapTask("", attemptId, 0, "", new BytesWritable()) { |
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| 79 | @Override |
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| 80 | public String toString() { |
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| 81 | return String.format("%s on %s", getTaskID(), tts.getTrackerName()); |
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| 82 | } |
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| 83 | }; |
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| 84 | taskTrackerManager.update(tts.getTrackerName(), task); |
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| 85 | runningMapTasks++; |
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| 86 | return task; |
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| 87 | } |
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| 88 | |
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| 89 | @Override |
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| 90 | public Task obtainNewReduceTask(final TaskTrackerStatus tts, |
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| 91 | int clusterSize, int ignored) throws IOException { |
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| 92 | TaskAttemptID attemptId = getTaskAttemptID(false); |
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| 93 | Task task = new ReduceTask("", attemptId, 0, 10) { |
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| 94 | @Override |
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| 95 | public String toString() { |
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| 96 | return String.format("%s on %s", getTaskID(), tts.getTrackerName()); |
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| 97 | } |
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| 98 | }; |
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| 99 | taskTrackerManager.update(tts.getTrackerName(), task); |
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| 100 | runningReduceTasks++; |
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| 101 | return task; |
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| 102 | } |
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| 103 | |
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| 104 | private TaskAttemptID getTaskAttemptID(boolean isMap) { |
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| 105 | JobID jobId = getJobID(); |
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| 106 | return new TaskAttemptID(jobId.getJtIdentifier(), |
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| 107 | jobId.getId(), isMap, ++taskCounter, 0); |
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| 108 | } |
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| 109 | } |
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| 110 | |
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| 111 | static class FakeTaskTrackerManager implements TaskTrackerManager { |
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| 112 | |
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| 113 | int maps = 0; |
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| 114 | int reduces = 0; |
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| 115 | int maxMapTasksPerTracker = 2; |
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| 116 | int maxReduceTasksPerTracker = 2; |
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| 117 | List<JobInProgressListener> listeners = |
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| 118 | new ArrayList<JobInProgressListener>(); |
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| 119 | QueueManager queueManager; |
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| 120 | |
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| 121 | private Map<String, TaskTrackerStatus> trackers = |
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| 122 | new HashMap<String, TaskTrackerStatus>(); |
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| 123 | |
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| 124 | public FakeTaskTrackerManager() { |
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| 125 | JobConf conf = new JobConf(); |
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| 126 | queueManager = new QueueManager(conf); |
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| 127 | trackers.put("tt1", new TaskTrackerStatus("tt1", "tt1.host", 1, |
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| 128 | new ArrayList<TaskStatus>(), 0, |
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| 129 | maxMapTasksPerTracker, maxReduceTasksPerTracker)); |
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| 130 | trackers.put("tt2", new TaskTrackerStatus("tt2", "tt2.host", 2, |
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| 131 | new ArrayList<TaskStatus>(), 0, |
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| 132 | maxMapTasksPerTracker, maxReduceTasksPerTracker)); |
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| 133 | } |
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| 134 | |
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| 135 | @Override |
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| 136 | public ClusterStatus getClusterStatus() { |
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| 137 | int numTrackers = trackers.size(); |
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| 138 | return new ClusterStatus(numTrackers, 0, |
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| 139 | JobTracker.TASKTRACKER_EXPIRY_INTERVAL, |
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| 140 | maps, reduces, |
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| 141 | numTrackers * maxMapTasksPerTracker, |
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| 142 | numTrackers * maxReduceTasksPerTracker, |
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| 143 | JobTracker.State.RUNNING); |
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| 144 | } |
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| 145 | |
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| 146 | @Override |
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| 147 | public int getNumberOfUniqueHosts() { |
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| 148 | return 0; |
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| 149 | } |
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| 150 | |
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| 151 | @Override |
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| 152 | public Collection<TaskTrackerStatus> taskTrackers() { |
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| 153 | return trackers.values(); |
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| 154 | } |
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| 155 | |
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| 156 | |
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| 157 | @Override |
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| 158 | public void addJobInProgressListener(JobInProgressListener listener) { |
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| 159 | listeners.add(listener); |
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| 160 | } |
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| 161 | |
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| 162 | @Override |
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| 163 | public void removeJobInProgressListener(JobInProgressListener listener) { |
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| 164 | listeners.remove(listener); |
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| 165 | } |
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| 166 | |
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| 167 | @Override |
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| 168 | public QueueManager getQueueManager() { |
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| 169 | return queueManager; |
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| 170 | } |
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| 171 | |
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| 172 | @Override |
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| 173 | public int getNextHeartbeatInterval() { |
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| 174 | return MRConstants.HEARTBEAT_INTERVAL_MIN; |
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| 175 | } |
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| 176 | |
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| 177 | @Override |
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| 178 | public void killJob(JobID jobid) { |
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| 179 | return; |
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| 180 | } |
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| 181 | |
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| 182 | @Override |
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| 183 | public JobInProgress getJob(JobID jobid) { |
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| 184 | return null; |
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| 185 | } |
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| 186 | |
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| 187 | public void initJob(JobInProgress job) { |
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| 188 | // do nothing |
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| 189 | } |
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| 190 | |
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| 191 | public void failJob(JobInProgress job) { |
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| 192 | // do nothing |
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| 193 | } |
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| 194 | |
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| 195 | // Test methods |
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| 196 | |
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| 197 | public void submitJob(JobInProgress job) throws IOException { |
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| 198 | for (JobInProgressListener listener : listeners) { |
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| 199 | listener.jobAdded(job); |
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| 200 | } |
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| 201 | } |
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| 202 | |
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| 203 | public TaskTrackerStatus getTaskTracker(String trackerID) { |
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| 204 | return trackers.get(trackerID); |
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| 205 | } |
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| 206 | |
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| 207 | public void update(String taskTrackerName, final Task t) { |
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| 208 | if (t.isMapTask()) { |
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| 209 | maps++; |
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| 210 | } else { |
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| 211 | reduces++; |
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| 212 | } |
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| 213 | TaskStatus status = new TaskStatus() { |
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| 214 | @Override |
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| 215 | public boolean getIsMap() { |
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| 216 | return t.isMapTask(); |
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| 217 | } |
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| 218 | }; |
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| 219 | status.setRunState(TaskStatus.State.RUNNING); |
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| 220 | trackers.get(taskTrackerName).getTaskReports().add(status); |
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| 221 | } |
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| 222 | |
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| 223 | } |
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| 224 | |
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| 225 | protected JobConf jobConf; |
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| 226 | protected TaskScheduler scheduler; |
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| 227 | private FakeTaskTrackerManager taskTrackerManager; |
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| 228 | |
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| 229 | @Override |
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| 230 | protected void setUp() throws Exception { |
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| 231 | resetCounters(); |
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| 232 | jobConf = new JobConf(); |
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| 233 | jobConf.setNumMapTasks(10); |
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| 234 | jobConf.setNumReduceTasks(10); |
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| 235 | taskTrackerManager = new FakeTaskTrackerManager(); |
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| 236 | scheduler = createTaskScheduler(); |
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| 237 | scheduler.setConf(jobConf); |
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| 238 | scheduler.setTaskTrackerManager(taskTrackerManager); |
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| 239 | scheduler.start(); |
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| 240 | } |
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| 241 | |
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| 242 | @Override |
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| 243 | protected void tearDown() throws Exception { |
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| 244 | if (scheduler != null) { |
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| 245 | scheduler.terminate(); |
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| 246 | } |
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| 247 | } |
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| 248 | |
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| 249 | protected TaskScheduler createTaskScheduler() { |
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| 250 | return new JobQueueTaskScheduler(); |
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| 251 | } |
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| 252 | |
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| 253 | static void submitJobs(FakeTaskTrackerManager taskTrackerManager, JobConf jobConf, |
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| 254 | int numJobs, int state) |
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| 255 | throws IOException { |
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| 256 | for (int i = 0; i < numJobs; i++) { |
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| 257 | JobInProgress job = new FakeJobInProgress(jobConf, taskTrackerManager); |
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| 258 | job.getStatus().setRunState(state); |
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| 259 | taskTrackerManager.submitJob(job); |
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| 260 | } |
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| 261 | } |
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| 262 | |
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| 263 | public void testTaskNotAssignedWhenNoJobsArePresent() throws IOException { |
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| 264 | assertEquals(0, scheduler.assignTasks(tracker(taskTrackerManager, "tt1")).size()); |
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| 265 | } |
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| 266 | |
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| 267 | public void testNonRunningJobsAreIgnored() throws IOException { |
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| 268 | submitJobs(taskTrackerManager, jobConf, 1, JobStatus.PREP); |
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| 269 | submitJobs(taskTrackerManager, jobConf, 1, JobStatus.SUCCEEDED); |
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| 270 | submitJobs(taskTrackerManager, jobConf, 1, JobStatus.FAILED); |
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| 271 | submitJobs(taskTrackerManager, jobConf, 1, JobStatus.KILLED); |
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| 272 | assertEquals(0, scheduler.assignTasks(tracker(taskTrackerManager, "tt1")).size()); |
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| 273 | } |
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| 274 | |
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| 275 | public void testDefaultTaskAssignment() throws IOException { |
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| 276 | submitJobs(taskTrackerManager, jobConf, 2, JobStatus.RUNNING); |
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| 277 | // All slots are filled with job 1 |
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| 278 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt1"), |
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| 279 | new String[] {"attempt_test_0001_m_000001_0 on tt1", |
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| 280 | "attempt_test_0001_m_000002_0 on tt1", |
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| 281 | "attempt_test_0001_r_000003_0 on tt1"}); |
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| 282 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt1"), |
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| 283 | new String[] {"attempt_test_0001_r_000004_0 on tt1"}); |
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| 284 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt1"), new String[] {}); |
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| 285 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt2"), |
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| 286 | new String[] {"attempt_test_0001_m_000005_0 on tt2", |
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| 287 | "attempt_test_0001_m_000006_0 on tt2", |
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| 288 | "attempt_test_0001_r_000007_0 on tt2"}); |
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| 289 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt2"), |
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| 290 | new String[] {"attempt_test_0001_r_000008_0 on tt2"}); |
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| 291 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt2"), new String[] {}); |
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| 292 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt1"), new String[] {}); |
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| 293 | checkAssignment(scheduler, tracker(taskTrackerManager, "tt2"), new String[] {}); |
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| 294 | } |
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| 295 | |
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| 296 | static TaskTrackerStatus tracker(FakeTaskTrackerManager taskTrackerManager, |
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| 297 | String taskTrackerName) { |
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| 298 | return taskTrackerManager.getTaskTracker(taskTrackerName); |
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| 299 | } |
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| 300 | |
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| 301 | static void checkAssignment(TaskScheduler scheduler, TaskTrackerStatus tts, |
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| 302 | String[] expectedTaskStrings) throws IOException { |
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| 303 | List<Task> tasks = scheduler.assignTasks(tts); |
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| 304 | assertNotNull(tasks); |
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| 305 | assertEquals(expectedTaskStrings.length, tasks.size()); |
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| 306 | for (int i=0; i < expectedTaskStrings.length; ++i) { |
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| 307 | assertEquals(expectedTaskStrings[i], tasks.get(i).toString()); |
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| 308 | } |
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| 309 | } |
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| 310 | |
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| 311 | } |
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