TaskID.java
上传用户:quxuerui
上传日期:2018-01-08
资源大小:41811k
文件大小:5k
- /**
- * 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;
- /**
- * 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
- 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
- */
- public TaskID(org.apache.hadoop.mapreduce.JobID jobId, boolean isMap,int id) {
- super(jobId, isMap, 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
- */
- public TaskID(String jtIdentifier, int jobId, boolean isMap, int id) {
- this(new JobID(jtIdentifier, jobId), isMap, id);
- }
-
- public TaskID() {
- super(new JobID(), false, 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.isMap(),
- 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
- public static String getTaskIDsPattern(String jtIdentifier, Integer jobId
- , Boolean isMap, Integer taskId) {
- StringBuilder builder = new StringBuilder(TASK).append(SEPARATOR)
- .append(getTaskIDsPatternWOPrefix(jtIdentifier, jobId, isMap, taskId));
- return builder.toString();
- }
-
- @Deprecated
- static StringBuilder getTaskIDsPatternWOPrefix(String jtIdentifier
- , Integer jobId, Boolean isMap, Integer taskId) {
- StringBuilder builder = new StringBuilder();
- builder.append(JobID.getJobIDsPatternWOPrefix(jtIdentifier, jobId))
- .append(SEPARATOR)
- .append(isMap != null ? (isMap ? "m" : "r") : "(m|r)").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);
- }
- }