hadoop JobID 源码

  • 2022-10-20
  • 浏览 (137)

haddop JobID 代码

文件路径:/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/JobID.java

/**
 * 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.mapreduce;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.text.NumberFormat;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.Text;

/**
 * JobID represents the immutable and unique identifier for 
 * the job. JobID consists of two parts. First part 
 * represents the jobtracker identifier, so that jobID to jobtracker map 
 * is defined. For cluster setup this string is the jobtracker 
 * start time, for local setting, it is "local" and a random number.
 * Second part of the JobID is the job number. <br> 
 * An example JobID is : 
 * <code>job_200707121733_0003</code> , which represents the third job 
 * running at the jobtracker started at <code>200707121733</code>. 
 * <p>
 * Applications should never construct or parse JobID strings, but rather 
 * use appropriate constructors or {@link #forName(String)} method. 
 * 
 * @see TaskID
 * @see TaskAttemptID
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class JobID extends org.apache.hadoop.mapred.ID 
                   implements Comparable<ID> {
  public static final String JOB = "job";
  
  // Jobid regex for various tools and framework components
  public static final String JOBID_REGEX = 
    JOB + SEPARATOR + "[0-9]+" + SEPARATOR + "[0-9]+";
  
  private final Text jtIdentifier;
  
  protected static final NumberFormat idFormat = NumberFormat.getInstance();
  static {
    idFormat.setGroupingUsed(false);
    idFormat.setMinimumIntegerDigits(4);
  }
  
  /**
   * Constructs a JobID object 
   * @param jtIdentifier jobTracker identifier
   * @param id job number
   */
  public JobID(String jtIdentifier, int id) {
    super(id);
    this.jtIdentifier = new Text(jtIdentifier);
  }
  
  public JobID() { 
    jtIdentifier = new Text();
  }
  
  public String getJtIdentifier() {
    return jtIdentifier.toString();
  }
  
  @Override
  public boolean equals(Object o) {
    if (!super.equals(o))
      return false;

    JobID that = (JobID)o;
    return this.jtIdentifier.equals(that.jtIdentifier);
  }
  
  /**Compare JobIds by first jtIdentifiers, then by job numbers*/
  @Override
  public int compareTo(ID o) {
    JobID that = (JobID)o;
    int jtComp = this.jtIdentifier.compareTo(that.jtIdentifier);
    if(jtComp == 0) {
      return this.id - that.id;
    }
    else return jtComp;
  }
  
  /**
   * Add the stuff after the "job" prefix to the given builder. This is useful,
   * because the sub-ids use this substring at the start of their string.
   * @param builder the builder to append to
   * @return the builder that was passed in
   */
  public StringBuilder appendTo(StringBuilder builder) {
    builder.append(SEPARATOR);
    builder.append(jtIdentifier);
    builder.append(SEPARATOR);
    builder.append(idFormat.format(id));
    return builder;
  }

  @Override
  public int hashCode() {
    return jtIdentifier.hashCode() + id;
  }

  @Override
  public String toString() {
    return appendTo(new StringBuilder(JOB)).toString();
  }

  @Override
  public void readFields(DataInput in) throws IOException {
    super.readFields(in);
    this.jtIdentifier.readFields(in);
  }

  @Override
  public void write(DataOutput out) throws IOException {
    super.write(out);
    jtIdentifier.write(out);
  }
  
  /** Construct a JobId object from given string 
   * @return constructed JobId object or null if the given String is null
   * @throws IllegalArgumentException if the given string is malformed
   */
  public static JobID forName(String str) throws IllegalArgumentException {
    if(str == null)
      return null;
    try {
      String[] parts = str.split("_");
      if(parts.length == 3) {
        if(parts[0].equals(JOB)) {
          return new org.apache.hadoop.mapred.JobID(parts[1], 
                                                    Integer.parseInt(parts[2]));
        }
      }
    }catch (Exception ex) {//fall below
    }
    throw new IllegalArgumentException("JobId string : " + str 
        + " is not properly formed");
  }
  
}

相关信息

hadoop 源码目录

相关文章

hadoop Cluster 源码

hadoop ClusterMetrics 源码

hadoop ContextFactory 源码

hadoop Counter 源码

hadoop CounterGroup 源码

hadoop Counters 源码

hadoop CryptoUtils 源码

hadoop CustomJobEndNotifier 源码

hadoop FileSystemCounter 源码

hadoop ID 源码

0  赞