p2pMapReduce.mapreduceModule
Class JobID

java.lang.Object
  extended by p2pMapReduce.mapreduceModule.ID
      extended by p2pMapReduce.mapreduceModule.JobID
All Implemented Interfaces:
java.io.Serializable, java.lang.Comparable<ID>

public class JobID
extends ID
implements java.lang.Comparable<ID>

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.
An example JobID is : job_200707121733_0003 , which represents the third job running at the jobtracker started at 200707121733.

Applications should never construct or parse JobID strings, but rather use appropriate constructors or forName(String) method.

See Also:
TaskID, TaskAttemptID, org.apache.hadoop.mapred.JobTracker#getNewJobId(), org.apache.hadoop.mapred.JobTracker#getStartTime(), Serialized Form

Field Summary
protected static java.text.NumberFormat idFormat
           
protected static java.lang.String JOB
           
 
Fields inherited from class p2pMapReduce.mapreduceModule.ID
id, SEPARATOR
 
Constructor Summary
JobID()
           
JobID(java.lang.String jtIdentifier, int id)
          Constructs a JobID object
 
Method Summary
 java.lang.StringBuilder appendTo(java.lang.StringBuilder builder)
          Add the stuff after the "job" prefix to the given builder.
 int compareTo(ID o)
          Compare JobIds by first jtIdentifiers, then by job numbers
 boolean equals(java.lang.Object o)
           
static JobID forName(java.lang.String str)
          Construct a JobId object from given string
 java.lang.String getJtIdentifier()
           
 int hashCode()
           
 java.lang.String toString()
           
 
Methods inherited from class p2pMapReduce.mapreduceModule.ID
getId
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

JOB

protected static final java.lang.String JOB
See Also:
Constant Field Values

idFormat

protected static final java.text.NumberFormat idFormat
Constructor Detail

JobID

public JobID(java.lang.String jtIdentifier,
             int id)
Constructs a JobID object

Parameters:
jtIdentifier - jobTracker identifier
id - job number

JobID

public JobID()
Method Detail

getJtIdentifier

public java.lang.String getJtIdentifier()

equals

public boolean equals(java.lang.Object o)
Overrides:
equals in class ID

compareTo

public int compareTo(ID o)
Compare JobIds by first jtIdentifiers, then by job numbers

Specified by:
compareTo in interface java.lang.Comparable<ID>
Overrides:
compareTo in class ID

appendTo

public java.lang.StringBuilder appendTo(java.lang.StringBuilder builder)
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.

Parameters:
builder - the builder to append to
Returns:
the builder that was passed in

hashCode

public int hashCode()
Overrides:
hashCode in class ID

toString

public java.lang.String toString()
Overrides:
toString in class ID

forName

public static JobID forName(java.lang.String str)
                     throws java.lang.IllegalArgumentException
Construct a JobId object from given string

Returns:
constructed JobId object or null if the given String is null
Throws:
java.lang.IllegalArgumentException - if the given string is malformed