TaskAttemptID.java
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上传日期:2018-01-08
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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.IOException;
- /**
- * TaskAttemptID represents the immutable and unique identifier for
- * a task attempt. Each task attempt is one particular instance of a Map or
- * Reduce Task identified by its TaskID.
- *
- * TaskAttemptID consists of 2 parts. First part is the
- * {@link TaskID}, that this TaskAttemptID belongs to.
- * Second part is the task attempt number. <br>
- * An example TaskAttemptID is :
- * <code>attempt_200707121733_0003_m_000005_0</code> , which represents the
- * zeroth task attempt for the fifth map task in the third job
- * running at the jobtracker started at <code>200707121733</code>.
- * <p>
- * Applications should never construct or parse TaskAttemptID strings
- * , but rather use appropriate constructors or {@link #forName(String)}
- * method.
- *
- * @see JobID
- * @see TaskID
- */
- @Deprecated
- public class TaskAttemptID extends org.apache.hadoop.mapreduce.TaskAttemptID {
-
- /**
- * Constructs a TaskAttemptID object from given {@link TaskID}.
- * @param taskId TaskID that this task belongs to
- * @param id the task attempt number
- */
- public TaskAttemptID(TaskID taskId, int id) {
- super(taskId, id);
- }
-
- /**
- * Constructs a TaskId object from given parts.
- * @param jtIdentifier jobTracker identifier
- * @param jobId job number
- * @param isMap whether the tip is a map
- * @param taskId taskId number
- * @param id the task attempt number
- */
- public TaskAttemptID(String jtIdentifier, int jobId, boolean isMap,
- int taskId, int id) {
- this(new TaskID(jtIdentifier, jobId, isMap, taskId), id);
- }
-
- public TaskAttemptID() {
- super(new TaskID(), 0);
- }
- /**
- * Downgrade a new TaskAttemptID to an old one
- * @param old the new id
- * @return either old or a new TaskAttemptID constructed to match old
- */
- public static
- TaskAttemptID downgrade(org.apache.hadoop.mapreduce.TaskAttemptID old) {
- if (old instanceof TaskAttemptID) {
- return (TaskAttemptID) old;
- } else {
- return new TaskAttemptID(TaskID.downgrade(old.getTaskID()), old.getId());
- }
- }
- public TaskID getTaskID() {
- return (TaskID) super.getTaskID();
- }
- public JobID getJobID() {
- return (JobID) super.getJobID();
- }
- @Deprecated
- public static TaskAttemptID read(DataInput in) throws IOException {
- TaskAttemptID taskId = new TaskAttemptID();
- taskId.readFields(in);
- return taskId;
- }
-
- /** Construct a TaskAttemptID object from given string
- * @return constructed TaskAttemptID object or null if the given String is null
- * @throws IllegalArgumentException if the given string is malformed
- */
- public static TaskAttemptID forName(String str
- ) throws IllegalArgumentException {
- return (TaskAttemptID)
- org.apache.hadoop.mapreduce.TaskAttemptID.forName(str);
- }
-
- /**
- * Returns a regex pattern which matches task attempt 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>all task attempt IDs</i>
- * of <i>any jobtracker</i>, in <i>any job</i>, of the <i>first
- * map task</i>, we would use :
- * <pre>
- * TaskAttemptID.getTaskAttemptIDsPattern(null, null, true, 1, null);
- * </pre>
- * which will return :
- * <pre> "attempt_[^_]*_[0-9]*_m_000001_[0-9]*" </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
- * @param attemptId the task attempt number, or null
- * @return a regex pattern matching TaskAttemptIDs
- */
- @Deprecated
- public static String getTaskAttemptIDsPattern(String jtIdentifier,
- Integer jobId, Boolean isMap, Integer taskId, Integer attemptId) {
- StringBuilder builder = new StringBuilder(ATTEMPT).append(SEPARATOR);
- builder.append(getTaskAttemptIDsPatternWOPrefix(jtIdentifier, jobId,
- isMap, taskId, attemptId));
- return builder.toString();
- }
-
- @Deprecated
- static StringBuilder getTaskAttemptIDsPatternWOPrefix(String jtIdentifier
- , Integer jobId, Boolean isMap, Integer taskId, Integer attemptId) {
- StringBuilder builder = new StringBuilder();
- builder.append(TaskID.getTaskIDsPatternWOPrefix(jtIdentifier
- , jobId, isMap, taskId))
- .append(SEPARATOR)
- .append(attemptId != null ? attemptId : "[0-9]*");
- return builder;
- }
- }