hadoop JVMId 源码

haddop JVMId 代码

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

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

class JVMId {
  boolean isMap;
  final JobID jobId;
  private long jvmId;
  private static final String JVM = "jvm";
  private static final char SEPARATOR = '_';
  private static NumberFormat idFormat = NumberFormat.getInstance();
  static {
    idFormat.setGroupingUsed(false);
    idFormat.setMinimumIntegerDigits(6);
  }
  
  public JVMId(JobID jobId, boolean isMap, long id) {
    this.jvmId = id;
    this.isMap = isMap;
    this.jobId = jobId;
  }
  
  public JVMId (String jtIdentifier, int jobId, boolean isMap, long id) {
    this(new JobID(jtIdentifier, jobId), isMap, id);
  }
    
  public JVMId() { 
    jobId = new JobID();
  }
  
  public boolean isMapJVM() {
    return isMap;
  }
  public JobID getJobId() {
    return jobId;
  }

  @Override
  public boolean equals(Object o) {
    // Generated by IntelliJ IDEA 13.1.
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    JVMId jvmId1 = (JVMId) o;

    if (isMap != jvmId1.isMap) {
      return false;
    }
    if (jvmId != jvmId1.jvmId) {
      return false;
    }
    if (!jobId.equals(jvmId1.jobId)) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode() {
    // Generated by IntelliJ IDEA 13.1.
    int result = (isMap ? 1 : 0);
    result = 31 * result + jobId.hashCode();
    result = 31 * result + (int) (jvmId ^ (jvmId >>> 32));
    return result;
  }

  /**
   * Compare TaskInProgressIds by first jobIds, then by tip numbers. Reduces are
   * defined as greater then maps.
   **/
  public int compareTo(JVMId that) {
    int jobComp = this.jobId.compareTo(that.jobId);
    if(jobComp == 0) {
      if(this.isMap == that.isMap) {
        return Long.compare(this.jvmId, that.jvmId);
      } else {
        return this.isMap ? -1 : 1;
      }
    } else {
      return jobComp;
    }
  }
  
  @Override
  public String toString() { 
    return appendTo(new StringBuilder(JVM)).toString();
  }

  /**
   * This method does NOT override org.apache.hadoop.mapred.ID to accept 64-bit
   * ID to support work-preserving RM restart.
   * @return 64-bit JVM id.
   */
  public long getId() {
    return jvmId;
  }

  /**
   * Add the unique id to the given StringBuilder.
   * @param builder the builder to append to
   * @return the passed in builder.
   */
  protected StringBuilder appendTo(StringBuilder builder) {
    return jobId.appendTo(builder).
                 append(SEPARATOR).
                 append(isMap ? 'm' : 'r').
                 append(SEPARATOR).
                 append(idFormat.format(jvmId));
  }

  public void readFields(DataInput in) throws IOException {
    this.jvmId = in.readLong();
    this.jobId.readFields(in);
    this.isMap = in.readBoolean();
  }

  public void write(DataOutput out) throws IOException {
    out.writeLong(jvmId);
    jobId.write(out);
    out.writeBoolean(isMap);
  }
  
  /** Construct a JVMId object from given string 
   * @return constructed JVMId object or null if the given String is null
   * @throws IllegalArgumentException if the given string is malformed
   */
  public static JVMId forName(String str) 
    throws IllegalArgumentException {
    if(str == null)
      return null;
    try {
      String[] parts = str.split("_");
      if(parts.length == 5) {
        if(parts[0].equals(JVM)) {
          boolean isMap = false;
          if(parts[3].equals("m")) isMap = true;
          else if(parts[3].equals("r")) isMap = false;
          else throw new Exception();
          return new JVMId(parts[1], Integer.parseInt(parts[2]),
              isMap, Integer.parseInt(parts[4]));
        }
      }
    }catch (Exception ex) {//fall below
    }
    throw new IllegalArgumentException("TaskId string : " + str 
        + " is not properly formed");
  }

}

相关信息

hadoop 源码目录

相关文章

hadoop AMFeedback 源码

hadoop BackupStore 源码

hadoop BasicTypeSorterBase 源码

hadoop BufferSorter 源码

hadoop CleanupQueue 源码

hadoop Clock 源码

hadoop ClusterStatus 源码

hadoop Counters 源码

hadoop CumulativePeriodicStats 源码

hadoop DeprecatedQueueConfigurationParser 源码