org.apache.hadoop.mapred.JobID.java Source code

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Here is the source code for org.apache.hadoop.mapred.JobID.java

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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;

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

/**
 * 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".
 * 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.mapreduce.JobID {
    /**
     * Constructs a JobID object 
     * @param jtIdentifier jobTracker identifier
     * @param id job number
     */
    public JobID(String jtIdentifier, int id) {
        super(jtIdentifier, id);
    }

    public JobID() {
    }

    /**
     * Downgrade a new JobID to an old one
     * @param old a new or old JobID
     * @return either old or a new JobID build to match old
     */
    public static JobID downgrade(org.apache.hadoop.mapreduce.JobID old) {
        if (old instanceof JobID) {
            return (JobID) old;
        } else {
            return new JobID(old.getJtIdentifier(), old.getId());
        }
    }

    @Deprecated
    public static JobID read(DataInput in) throws IOException {
        JobID jobId = new JobID();
        jobId.readFields(in);
        return jobId;
    }

    /** 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 {
        return (JobID) org.apache.hadoop.mapreduce.JobID.forName(str);
    }

    /** 
     * 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>any job</i> 
     * run on the jobtracker started at <i>200707121733</i>, we would use :
     * <pre> 
     * JobID.getTaskIDsPattern("200707121733", null);
     * </pre>
     * which will return :
     * <pre> "job_200707121733_[0-9]*" </pre> 
     * @param jtIdentifier jobTracker identifier, or null
     * @param jobId job number, or null
     * @return a regex pattern matching JobIDs
     */
    @Deprecated
    public static String getJobIDsPattern(String jtIdentifier, Integer jobId) {
        StringBuilder builder = new StringBuilder(JOB).append(SEPARATOR);
        builder.append(getJobIDsPatternWOPrefix(jtIdentifier, jobId));
        return builder.toString();
    }

    @Deprecated
    static StringBuilder getJobIDsPatternWOPrefix(String jtIdentifier, Integer jobId) {
        StringBuilder builder = new StringBuilder();
        if (jtIdentifier != null) {
            builder.append(jtIdentifier);
        } else {
            builder.append("[^").append(SEPARATOR).append("]*");
        }
        builder.append(SEPARATOR).append(jobId != null ? idFormat.format(jobId) : "[0-9]*");
        return builder;
    }

}