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Hadoop is the distributed computing framework of Apache; hadoop-core contains
the filesystem, job tracker and map/reduce modules
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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.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
/**************************************************
* Describes the current status of a task. This is
* not intended to be a comprehensive piece of data.
*
**************************************************/
abstract class TaskStatus implements Writable, Cloneable {
static final Log LOG =
LogFactory.getLog(TaskStatus.class.getName());
//enumeration for reporting current phase of a task.
public static enum Phase{STARTING, MAP, SHUFFLE, SORT, REDUCE, CLEANUP}
// what state is the task in?
public static enum State {RUNNING, SUCCEEDED, FAILED, UNASSIGNED, KILLED,
COMMIT_PENDING, FAILED_UNCLEAN, KILLED_UNCLEAN}
private final TaskAttemptID taskid;
private float progress;
private volatile State runState;
private String diagnosticInfo;
private String stateString;
private String taskTracker;
private long startTime;
private long finishTime;
private long outputSize;
private volatile Phase phase = Phase.STARTING;
private Counters counters;
private boolean includeCounters;
private SortedRanges.Range nextRecordRange = new SortedRanges.Range();
public TaskStatus() {
taskid = new TaskAttemptID();
}
public TaskStatus(TaskAttemptID taskid, float progress,
State runState, String diagnosticInfo,
String stateString, String taskTracker,
Phase phase, Counters counters) {
this.taskid = taskid;
this.progress = progress;
this.runState = runState;
this.diagnosticInfo = diagnosticInfo;
this.stateString = stateString;
this.taskTracker = taskTracker;
this.phase = phase;
this.counters = counters;
this.includeCounters = true;
}
public TaskAttemptID getTaskID() { return taskid; }
public abstract boolean getIsMap();
public float getProgress() { return progress; }
public void setProgress(float progress) { this.progress = progress; }
public State getRunState() { return runState; }
public String getTaskTracker() {return taskTracker;}
public void setTaskTracker(String tracker) { this.taskTracker = tracker;}
public void setRunState(State runState) { this.runState = runState; }
public String getDiagnosticInfo() { return diagnosticInfo; }
public void setDiagnosticInfo(String info) {
diagnosticInfo =
((diagnosticInfo == null) ? info : diagnosticInfo.concat(info));
}
public String getStateString() { return stateString; }
public void setStateString(String stateString) { this.stateString = stateString; }
/**
* Get the next record range which is going to be processed by Task.
* @return nextRecordRange
*/
public SortedRanges.Range getNextRecordRange() {
return nextRecordRange;
}
/**
* Set the next record range which is going to be processed by Task.
* @param nextRecordRange
*/
public void setNextRecordRange(SortedRanges.Range nextRecordRange) {
this.nextRecordRange = nextRecordRange;
}
/**
* Get task finish time. if shuffleFinishTime and sortFinishTime
* are not set before, these are set to finishTime. It takes care of
* the case when shuffle, sort and finish are completed with in the
* heartbeat interval and are not reported separately. if task state is
* TaskStatus.FAILED then finish time represents when the task failed.
* @return finish time of the task.
*/
public long getFinishTime() {
return finishTime;
}
/**
* Sets finishTime.
* @param finishTime finish time of task.
*/
void setFinishTime(long finishTime) {
this.finishTime = finishTime;
}
/**
* Get shuffle finish time for the task. If shuffle finish time was
* not set due to shuffle/sort/finish phases ending within same
* heartbeat interval, it is set to finish time of next phase i.e. sort
* or task finish when these are set.
* @return 0 if shuffleFinishTime, sortFinishTime and finish time are not set. else
* it returns approximate shuffle finish time.
*/
public long getShuffleFinishTime() {
return 0;
}
/**
* Set shuffle finish time.
* @param shuffleFinishTime
*/
void setShuffleFinishTime(long shuffleFinishTime) {}
/**
* Get sort finish time for the task,. If sort finish time was not set
* due to sort and reduce phase finishing in same heartebat interval, it is
* set to finish time, when finish time is set.
* @return 0 if sort finish time and finish time are not set, else returns sort
* finish time if that is set, else it returns finish time.
*/
public long getSortFinishTime() {
return 0;
}
/**
* Sets sortFinishTime, if shuffleFinishTime is not set before
* then its set to sortFinishTime.
* @param sortFinishTime
*/
void setSortFinishTime(long sortFinishTime) {}
/**
* Get start time of the task.
* @return 0 is start time is not set, else returns start time.
*/
public long getStartTime() {
return startTime;
}
/**
* Set startTime of the task.
* @param startTime start time
*/
void setStartTime(long startTime) {
this.startTime = startTime;
}
/**
* Get current phase of this task. Phase.Map in case of map tasks,
* for reduce one of Phase.SHUFFLE, Phase.SORT or Phase.REDUCE.
* @return .
*/
public Phase getPhase(){
return this.phase;
}
/**
* Set current phase of this task.
* @param phase phase of this task
*/
void setPhase(Phase phase){
TaskStatus.Phase oldPhase = getPhase();
if (oldPhase != phase){
// sort phase started
if (phase == TaskStatus.Phase.SORT){
setShuffleFinishTime(System.currentTimeMillis());
}else if (phase == TaskStatus.Phase.REDUCE){
setSortFinishTime(System.currentTimeMillis());
}
}
this.phase = phase;
}
boolean inTaskCleanupPhase() {
return (this.phase == TaskStatus.Phase.CLEANUP &&
(this.runState == TaskStatus.State.FAILED_UNCLEAN ||
this.runState == TaskStatus.State.KILLED_UNCLEAN));
}
public boolean getIncludeCounters() {
return includeCounters;
}
public void setIncludeCounters(boolean send) {
includeCounters = send;
}
/**
* Get task's counters.
*/
public Counters getCounters() {
return counters;
}
/**
* Set the task's counters.
* @param counters
*/
public void setCounters(Counters counters) {
this.counters = counters;
}
/**
* Returns the number of bytes of output from this map.
*/
public long getOutputSize() {
return outputSize;
}
/**
* Set the size on disk of this task's output.
* @param l the number of map output bytes
*/
void setOutputSize(long l) {
outputSize = l;
}
/**
* Get the list of maps from which output-fetches failed.
*
* @return the list of maps from which output-fetches failed.
*/
public List getFetchFailedMaps() {
return null;
}
/**
* Add to the list of maps from which output-fetches failed.
*
* @param mapTaskId map from which fetch failed
*/
synchronized void addFetchFailedMap(TaskAttemptID mapTaskId) {}
/**
* Update the status of the task.
*
* This update is done by ping thread before sending the status.
*
* @param progress
* @param state
* @param counters
*/
synchronized void statusUpdate(float progress,
String state,
Counters counters) {
setProgress(progress);
setStateString(state);
setCounters(counters);
}
/**
* Update the status of the task.
*
* @param status updated status
*/
synchronized void statusUpdate(TaskStatus status) {
this.progress = status.getProgress();
this.runState = status.getRunState();
this.stateString = status.getStateString();
this.nextRecordRange = status.getNextRecordRange();
setDiagnosticInfo(status.getDiagnosticInfo());
if (status.getStartTime() != 0) {
this.startTime = status.getStartTime();
}
if (status.getFinishTime() != 0) {
this.finishTime = status.getFinishTime();
}
this.phase = status.getPhase();
this.counters = status.getCounters();
this.outputSize = status.outputSize;
}
/**
* Update specific fields of task status
*
* This update is done in JobTracker when a cleanup attempt of task
* reports its status. Then update only specific fields, not all.
*
* @param runState
* @param progress
* @param state
* @param phase
* @param finishTime
*/
synchronized void statusUpdate(State runState,
float progress,
String state,
Phase phase,
long finishTime) {
setRunState(runState);
setProgress(progress);
setStateString(state);
setPhase(phase);
if (finishTime != 0) {
this.finishTime = finishTime;
}
}
/**
* Clear out transient information after sending out a status-update
* from either the {@link Task} to the {@link TaskTracker} or from the
* {@link TaskTracker} to the {@link JobTracker}.
*/
synchronized void clearStatus() {
// Clear diagnosticInfo
diagnosticInfo = "";
}
@Override
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException cnse) {
// Shouldn't happen since we do implement Clonable
throw new InternalError(cnse.toString());
}
}
//////////////////////////////////////////////
// Writable
//////////////////////////////////////////////
public void write(DataOutput out) throws IOException {
taskid.write(out);
out.writeFloat(progress);
WritableUtils.writeEnum(out, runState);
Text.writeString(out, diagnosticInfo);
Text.writeString(out, stateString);
WritableUtils.writeEnum(out, phase);
out.writeLong(startTime);
out.writeLong(finishTime);
out.writeBoolean(includeCounters);
out.writeLong(outputSize);
if (includeCounters) {
counters.write(out);
}
nextRecordRange.write(out);
}
public void readFields(DataInput in) throws IOException {
this.taskid.readFields(in);
this.progress = in.readFloat();
this.runState = WritableUtils.readEnum(in, State.class);
this.diagnosticInfo = Text.readString(in);
this.stateString = Text.readString(in);
this.phase = WritableUtils.readEnum(in, Phase.class);
this.startTime = in.readLong();
this.finishTime = in.readLong();
counters = new Counters();
this.includeCounters = in.readBoolean();
this.outputSize = in.readLong();
if (includeCounters) {
counters.readFields(in);
}
nextRecordRange.readFields(in);
}
//////////////////////////////////////////////////////////////////////////////
// Factory-like methods to create/read/write appropriate TaskStatus objects
//////////////////////////////////////////////////////////////////////////////
static TaskStatus createTaskStatus(DataInput in, TaskAttemptID taskId, float progress,
State runState, String diagnosticInfo,
String stateString, String taskTracker,
Phase phase, Counters counters)
throws IOException {
boolean isMap = in.readBoolean();
return createTaskStatus(isMap, taskId, progress, runState, diagnosticInfo,
stateString, taskTracker, phase, counters);
}
static TaskStatus createTaskStatus(boolean isMap, TaskAttemptID taskId, float progress,
State runState, String diagnosticInfo,
String stateString, String taskTracker,
Phase phase, Counters counters) {
return (isMap) ? new MapTaskStatus(taskId, progress, runState,
diagnosticInfo, stateString, taskTracker,
phase, counters) :
new ReduceTaskStatus(taskId, progress, runState,
diagnosticInfo, stateString,
taskTracker, phase, counters);
}
static TaskStatus createTaskStatus(boolean isMap) {
return (isMap) ? new MapTaskStatus() : new ReduceTaskStatus();
}
static TaskStatus readTaskStatus(DataInput in) throws IOException {
boolean isMap = in.readBoolean();
TaskStatus taskStatus = createTaskStatus(isMap);
taskStatus.readFields(in);
return taskStatus;
}
static void writeTaskStatus(DataOutput out, TaskStatus taskStatus)
throws IOException {
out.writeBoolean(taskStatus.getIsMap());
taskStatus.write(out);
}
}