| /** |
| * 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.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.mapreduce.TaskType; |
| |
| /** |
| * TaskID represents the immutable and unique identifier for |
| * a Map or Reduce Task. Each TaskID encompasses multiple attempts made to |
| * execute the Map or Reduce Task, each of which are uniquely indentified by |
| * their TaskAttemptID. |
| * |
| * TaskID consists of 3 parts. First part is the {@link JobID}, that this |
| * TaskInProgress belongs to. Second part of the TaskID is either 'm' or 'r' |
| * representing whether the task is a map task or a reduce task. |
| * And the third part is the task number. <br> |
| * An example TaskID is : |
| * <code>task_200707121733_0003_m_000005</code> , which represents the |
| * fifth map task in the third job running at the jobtracker |
| * started at <code>200707121733</code>. |
| * <p> |
| * Applications should never construct or parse TaskID strings |
| * , but rather use appropriate constructors or {@link #forName(String)} |
| * method. |
| * |
| * @see JobID |
| * @see TaskAttemptID |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class TaskID extends org.apache.hadoop.mapreduce.TaskID { |
| |
| /** |
| * Constructs a TaskID object from given {@link JobID}. |
| * @param jobId JobID that this tip belongs to |
| * @param isMap whether the tip is a map |
| * @param id the tip number |
| * @deprecated Use {@link #TaskID(String, int, TaskType, int)} |
| */ |
| @Deprecated |
| public TaskID(org.apache.hadoop.mapreduce.JobID jobId, boolean isMap,int id) { |
| this(jobId, isMap ? TaskType.MAP : TaskType.REDUCE, id); |
| } |
| |
| /** |
| * Constructs a TaskInProgressId object from given parts. |
| * @param jtIdentifier jobTracker identifier |
| * @param jobId job number |
| * @param isMap whether the tip is a map |
| * @param id the tip number |
| * @deprecated Use {@link #TaskID(org.apache.hadoop.mapreduce.JobID, TaskType, |
| * int)} |
| */ |
| @Deprecated |
| public TaskID(String jtIdentifier, int jobId, boolean isMap, int id) { |
| this(jtIdentifier, jobId, isMap ? TaskType.MAP : TaskType.REDUCE, id); |
| } |
| |
| /** |
| * Constructs a TaskID object from given {@link JobID}. |
| * @param jobId JobID that this tip belongs to |
| * @param type the {@link TaskType} |
| * @param id the tip number |
| */ |
| public TaskID(org.apache.hadoop.mapreduce.JobID jobId, TaskType type,int id) { |
| super(jobId, type, id); |
| } |
| |
| /** |
| * Constructs a TaskInProgressId object from given parts. |
| * @param jtIdentifier jobTracker identifier |
| * @param jobId job number |
| * @param type the {@link TaskType} |
| * @param id the tip number |
| */ |
| public TaskID(String jtIdentifier, int jobId, TaskType type, int id) { |
| this(new JobID(jtIdentifier, jobId), type, id); |
| } |
| |
| public TaskID() { |
| super(new JobID(), TaskType.REDUCE, 0); |
| } |
| |
| /** |
| * Downgrade a new TaskID to an old one |
| * @param old a new or old TaskID |
| * @return either old or a new TaskID build to match old |
| */ |
| public static TaskID downgrade(org.apache.hadoop.mapreduce.TaskID old) { |
| if (old instanceof TaskID) { |
| return (TaskID) old; |
| } else { |
| return new TaskID(JobID.downgrade(old.getJobID()), old.getTaskType(), |
| old.getId()); |
| } |
| } |
| |
| @Deprecated |
| public static TaskID read(DataInput in) throws IOException { |
| TaskID tipId = new TaskID(); |
| tipId.readFields(in); |
| return tipId; |
| } |
| |
| public JobID getJobID() { |
| return (JobID) super.getJobID(); |
| } |
| |
| /** |
| * Returns a regex pattern which matches task IDs. Arguments can |
| * be given null, in which case that part of the regex will be generic. |
| * For example to obtain a regex matching <i>the first map task</i> |
| * of <i>any jobtracker</i>, of <i>any job</i>, we would use : |
| * <pre> |
| * TaskID.getTaskIDsPattern(null, null, true, 1); |
| * </pre> |
| * which will return : |
| * <pre> "task_[^_]*_[0-9]*_m_000001*" </pre> |
| * @param jtIdentifier jobTracker identifier, or null |
| * @param jobId job number, or null |
| * @param isMap whether the tip is a map, or null |
| * @param taskId taskId number, or null |
| * @return a regex pattern matching TaskIDs |
| * @deprecated Use {@link TaskID#getTaskIDsPattern(String, Integer, TaskType, |
| * Integer)} |
| */ |
| @Deprecated |
| public static String getTaskIDsPattern(String jtIdentifier, Integer jobId |
| , Boolean isMap, Integer taskId) { |
| return getTaskIDsPattern(jtIdentifier, jobId, |
| isMap ? TaskType.MAP : TaskType.REDUCE, taskId); |
| } |
| |
| /** |
| * Returns a regex pattern which matches task IDs. Arguments can |
| * be given null, in which case that part of the regex will be generic. |
| * For example to obtain a regex matching <i>the first map task</i> |
| * of <i>any jobtracker</i>, of <i>any job</i>, we would use : |
| * <pre> |
| * TaskID.getTaskIDsPattern(null, null, true, 1); |
| * </pre> |
| * which will return : |
| * <pre> "task_[^_]*_[0-9]*_m_000001*" </pre> |
| * @param jtIdentifier jobTracker identifier, or null |
| * @param jobId job number, or null |
| * @param type the {@link TaskType}, or null |
| * @param taskId taskId number, or null |
| * @return a regex pattern matching TaskIDs |
| */ |
| @Deprecated |
| public static String getTaskIDsPattern(String jtIdentifier, Integer jobId |
| , TaskType type, Integer taskId) { |
| StringBuilder builder = new StringBuilder(TASK).append(SEPARATOR) |
| .append(getTaskIDsPatternWOPrefix(jtIdentifier, jobId, type, taskId)); |
| return builder.toString(); |
| } |
| |
| @Deprecated |
| static StringBuilder getTaskIDsPatternWOPrefix(String jtIdentifier |
| , Integer jobId, TaskType type, Integer taskId) { |
| StringBuilder builder = new StringBuilder(); |
| builder.append(JobID.getJobIDsPatternWOPrefix(jtIdentifier, jobId)) |
| .append(SEPARATOR) |
| .append(type != null ? |
| (org.apache.hadoop.mapreduce.TaskID.getRepresentingCharacter(type)) : |
| org.apache.hadoop.mapreduce.TaskID.getAllTaskTypes()). |
| append(SEPARATOR) |
| .append(taskId != null ? idFormat.format(taskId) : "[0-9]*"); |
| return builder; |
| } |
| |
| public static TaskID forName(String str |
| ) throws IllegalArgumentException { |
| return (TaskID) org.apache.hadoop.mapreduce.TaskID.forName(str); |
| } |
| |
| } |