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java.lang.Objectorg.apache.hadoop.mapreduce.ID
org.apache.hadoop.mapred.ID
org.apache.hadoop.mapreduce.TaskID
org.apache.hadoop.mapred.TaskID
public class TaskID
TaskID represents the immutable and unique identifier for
a Map or Reduce Task. Each TaskID encompasses multiple attempts made to
execute the Map or Reduce Task, each of which are uniquely indentified by
their TaskAttemptID.
TaskID consists of 3 parts. First part is the JobID, that this
TaskInProgress belongs to. Second part of the TaskID is either 'm' or 'r'
representing whether the task is a map task or a reduce task.
And the third part is the task number.
An example TaskID is :
task_200707121733_0003_m_000005 , which represents the
fifth map task in the third job running at the jobtracker
started at 200707121733.
Applications should never construct or parse TaskID strings
, but rather use appropriate constructors or forName(String)
method.
JobID,
TaskAttemptID| Field Summary |
|---|
| Fields inherited from class org.apache.hadoop.mapreduce.TaskID |
|---|
idFormat, TASK |
| Fields inherited from class org.apache.hadoop.mapreduce.ID |
|---|
id, SEPARATOR |
| Constructor Summary | |
|---|---|
TaskID()
|
|
TaskID(JobID jobId,
boolean isMap,
int id)
Constructs a TaskID object from given JobID. |
|
TaskID(String jtIdentifier,
int jobId,
boolean isMap,
int id)
Constructs a TaskInProgressId object from given parts. |
|
| Method Summary | |
|---|---|
static TaskID |
downgrade(TaskID old)
Downgrade a new TaskID to an old one |
static TaskID |
forName(String str)
|
JobID |
getJobID()
Returns the JobID object that this tip belongs to |
static String |
getTaskIDsPattern(String jtIdentifier,
Integer jobId,
Boolean isMap,
Integer taskId)
Deprecated. |
static TaskID |
read(DataInput in)
Deprecated. |
| Methods inherited from class org.apache.hadoop.mapreduce.TaskID |
|---|
appendTo, compareTo, equals, hashCode, isMap, readFields, toString, write |
| Methods inherited from class org.apache.hadoop.mapreduce.ID |
|---|
getId |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public TaskID(JobID jobId,
boolean isMap,
int id)
JobID.
jobId - JobID that this tip belongs toisMap - whether the tip is a mapid - the tip number
public TaskID(String jtIdentifier,
int jobId,
boolean isMap,
int id)
jtIdentifier - jobTracker identifierjobId - job numberisMap - whether the tip is a mapid - the tip numberpublic TaskID()
| Method Detail |
|---|
public static TaskID downgrade(TaskID old)
old - a new or old TaskID
@Deprecated
public static TaskID read(DataInput in)
throws IOException
IOExceptionpublic JobID getJobID()
TaskIDJobID object that this tip belongs to
getJobID in class TaskID
@Deprecated
public static String getTaskIDsPattern(String jtIdentifier,
Integer jobId,
Boolean isMap,
Integer taskId)
TaskID.getTaskIDsPattern(null, null, true, 1);which will return :
"task_[^_]*_[0-9]*_m_000001*"
jtIdentifier - jobTracker identifier, or nulljobId - job number, or nullisMap - whether the tip is a map, or nulltaskId - taskId number, or null
public static TaskID forName(String str)
throws IllegalArgumentException
IllegalArgumentException
|
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