Java tutorial
/** * 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.tez.mapreduce.hadoop; import java.io.DataInput; import java.io.DataOutput; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.io.WritableUtils; import org.apache.hadoop.mapred.TaskStatus; import org.apache.tez.common.TezTaskStatus; import org.apache.tez.common.counters.TezCounters; import org.apache.tez.dag.records.TezTaskAttemptID; public class MRTaskStatus implements TezTaskStatus { static final Log LOG = LogFactory.getLog(TaskStatus.class.getName()); // max task-status string size static final int MAX_STRING_SIZE = 1024; private TezTaskAttemptID taskAttemptId; private State state = State.UNASSIGNED; private float progress = 0.0f; private String diagnostics = ""; private String userStatusInfo = ""; private Phase phase; private TezCounters counters; private long localOutputSize; List<TezTaskAttemptID> failedTaskDependencies = new ArrayList<TezTaskAttemptID>(); private long startTime; private long finishTime; private long sortFinishTime; private long mapFinishTime; private long shuffleFinishTime; // For serialization. public MRTaskStatus() { } public MRTaskStatus(TezTaskAttemptID taskAttemptId, TezCounters counters, Phase phase) { this.taskAttemptId = taskAttemptId; this.counters = counters; this.phase = phase; } @Override public TezTaskAttemptID getTaskAttemptId() { return taskAttemptId; } @Override public float getProgress() { return progress; } @Override public void setProgress(float progress) { this.progress = progress; } @Override public State getRunState() { return state; } @Override public void setRunState(State state) { this.state = state; } @Override public String getDiagnosticInfo() { return diagnostics; } @Override public void setDiagnosticInfo(String info) { this.diagnostics = info; } @Override public String getStateString() { return userStatusInfo; } @Override public void setStateString(String userStatusInfo) { this.userStatusInfo = userStatusInfo; } @Override public long getFinishTime() { return finishTime; } @Override public long getShuffleFinishTime() { return shuffleFinishTime; } @Override public long getMapFinishTime() { return mapFinishTime; } @Override public long getSortFinishTime() { return sortFinishTime; } @Override public long getStartTime() { return startTime; } @Override public Phase getPhase() { return phase; } @Override public void setPhase(Phase phase) { Phase oldPhase = getPhase(); if (oldPhase != phase) { // sort phase started if (phase == Phase.SORT) { if (oldPhase == Phase.MAP) { setMapFinishTime(System.currentTimeMillis()); } else { setShuffleFinishTime(System.currentTimeMillis()); } } else if (phase == Phase.REDUCE) { setSortFinishTime(System.currentTimeMillis()); } this.phase = phase; } } @Override public TezCounters getCounters() { return counters; } @Override public void setCounters(TezCounters counters) { this.counters = counters; } @Override public long getLocalOutputSize() { return localOutputSize; } @Override public List<TezTaskAttemptID> getFailedDependencies() { return failedTaskDependencies; } @Override public void addFailedDependency(TezTaskAttemptID taskAttemptId) { failedTaskDependencies.add(taskAttemptId); } @Override synchronized public void clearStatus() { userStatusInfo = ""; failedTaskDependencies.clear(); } @Override synchronized public void statusUpdate(float progress, String userDiagnosticInfo, TezCounters counters) { setProgress(progress); setDiagnosticInfo(userDiagnosticInfo); setCounters(counters); } @Override public void setOutputSize(long localOutputSize) { this.localOutputSize = localOutputSize; } @Override public void setFinishTime(long finishTime) { if (this.getStartTime() > 0 && finishTime > 0) { if (getShuffleFinishTime() == 0) { setShuffleFinishTime(finishTime); } if (getSortFinishTime() == 0) { setSortFinishTime(finishTime); } if (getMapFinishTime() == 0) { setMapFinishTime(finishTime); } this.finishTime = finishTime; } } @Override public void setShuffleFinishTime(long shuffleFinishTime) { this.shuffleFinishTime = shuffleFinishTime; } @Override public void setMapFinishTime(long mapFinishTime) { this.mapFinishTime = mapFinishTime; } @Override public void setSortFinishTime(long sortFinishTime) { this.sortFinishTime = sortFinishTime; if (getShuffleFinishTime() == this.shuffleFinishTime) { setShuffleFinishTime(sortFinishTime); } } @Override public void setStartTime(long startTime) { this.startTime = startTime; } @Override public void write(DataOutput out) throws IOException { taskAttemptId.write(out); WritableUtils.writeEnum(out, state); out.writeFloat(progress); WritableUtils.writeString(out, diagnostics); WritableUtils.writeString(out, userStatusInfo); WritableUtils.writeEnum(out, phase); counters.write(out); out.writeLong(localOutputSize); out.writeLong(startTime); out.writeLong(finishTime); out.writeLong(sortFinishTime); out.writeLong(mapFinishTime); out.writeLong(shuffleFinishTime); out.writeInt(failedTaskDependencies.size()); for (TezTaskAttemptID taskAttemptId : failedTaskDependencies) { taskAttemptId.write(out); } } @Override public void readFields(DataInput in) throws IOException { taskAttemptId = TezTaskAttemptID.read(in); state = WritableUtils.readEnum(in, State.class); progress = in.readFloat(); diagnostics = WritableUtils.readString(in); userStatusInfo = WritableUtils.readString(in); phase = WritableUtils.readEnum(in, Phase.class); counters = new TezCounters(); counters.readFields(in); localOutputSize = in.readLong(); startTime = in.readLong(); finishTime = in.readLong(); sortFinishTime = in.readLong(); mapFinishTime = in.readLong(); shuffleFinishTime = in.readLong(); int numFailedDependencies = in.readInt(); for (int i = 0; i < numFailedDependencies; i++) { TezTaskAttemptID taskAttemptId = TezTaskAttemptID.read(in); failedTaskDependencies.add(taskAttemptId); } } }