org.apache.hadoop.mapred

类 JobID

java.lang.Object

org.apache.hadoop.mapreduce.ID

org.apache.hadoop.mapred.ID

org.apache.hadoop.mapreduce.JobID

org.apache.hadoop.mapred.JobID

所有已实现的接口:

Comparable<ID>, Writable, WritableComparable<ID>

public class JobID
extends JobID

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.

另请参阅:

TaskID, TaskAttemptID

字段概要

从类继承的字段 org.apache.hadoop.mapreduce.JobID

idFormat, JOB, JOBID_REGEX

从类继承的字段 org.apache.hadoop.mapreduce.ID

id, SEPARATOR

构造器概要

构造器

构造器和说明
JobID()
JobID(String jtIdentifier, int id) Constructs a JobID object

方法概要

方法

限定符和类型	方法和说明
static JobID	downgrade(JobID old) Downgrade a new JobID to an old one
static JobID	forName(String str) Construct a JobId object from given string
static String	getJobIDsPattern(String jtIdentifier, Integer jobId) 已过时。
static JobID	read(DataInput in) 已过时。

从类继承的方法 org.apache.hadoop.mapreduce.JobID

appendTo, compareTo, equals, getJtIdentifier, hashCode, readFields, toString, write

从类继承的方法 org.apache.hadoop.mapreduce.ID

getId

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

JobID

public JobID(String jtIdentifier,
     int id)

Constructs a JobID object

参数:

jtIdentifier - jobTracker identifier

id - job number

JobID

public JobID()

方法详细资料

downgrade

public static JobID downgrade(JobID old)

Downgrade a new JobID to an old one

参数:

old - a new or old JobID

返回:

either old or a new JobID build to match old

read

@Deprecated
public static JobID read(DataInput in)
                  throws IOException

已过时。

抛出:

IOException

forName

public static JobID forName(String str)
                     throws IllegalArgumentException

Construct a JobId object from given string

返回:

constructed JobId object or null if the given String is null

抛出:

IllegalArgumentException - if the given string is malformed

getJobIDsPattern

@Deprecated
public static String getJobIDsPattern(String jtIdentifier,
                                 Integer jobId)

已过时。

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 any job run on the jobtracker started at 200707121733, we would use :

 
 JobID.getTaskIDsPattern("200707121733", null);
 

which will return :

 "job_200707121733_[0-9]*" 

参数:

jtIdentifier - jobTracker identifier, or null

jobId - job number, or null

返回:

a regex pattern matching JobIDs