@InterfaceAudience.Public @InterfaceStability.Stable public class TaskID extends ID
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. 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| Modifier and Type | Field and Description |
|---|---|
protected static NumberFormat |
idFormat |
protected static String |
TASK |
static String |
TASK_ID_REGEX |
static Pattern |
taskIdPattern |
| Constructor and Description |
|---|
TaskID()
Default constructor for Writable.
|
TaskID(JobID jobId,
boolean isMap,
int id)
Deprecated.
|
TaskID(JobID jobId,
TaskType type,
int id)
Constructs a TaskID object from given
JobID. |
TaskID(String jtIdentifier,
int jobId,
boolean isMap,
int id)
Deprecated.
|
TaskID(String jtIdentifier,
int jobId,
TaskType type,
int id)
Constructs a TaskInProgressId object from given parts.
|
| Modifier and Type | Method and Description |
|---|---|
protected StringBuilder |
appendTo(StringBuilder builder)
Add the unique string to the given builder.
|
int |
compareTo(ID o)
Compare TaskInProgressIds by first jobIds, then by tip numbers.
|
boolean |
equals(Object o) |
static TaskID |
forName(String str)
Construct a TaskID object from given string.
|
static String |
getAllTaskTypes()
Returns a string of characters describing all possible
TaskType
values |
JobID |
getJobID()
Returns the
JobID object that this tip belongs to. |
static char |
getRepresentingCharacter(TaskType type)
Gets the character representing the
TaskType. |
TaskType |
getTaskType()
Get the type of the task.
|
static TaskType |
getTaskType(char c)
Gets the
TaskType corresponding to the character. |
int |
hashCode() |
boolean |
isMap()
Deprecated.
|
void |
readFields(DataInput in)
Deserialize the fields of this object from
in. |
String |
toString() |
void |
write(DataOutput out)
Serialize the fields of this object to
out. |
protected static final String TASK
protected static final NumberFormat idFormat
public static final String TASK_ID_REGEX
public static final Pattern taskIdPattern
public TaskID(JobID jobId, TaskType type, int id)
JobID.jobId - JobID that this tip belongs totype - the TaskType of the taskid - the tip numberpublic TaskID(String jtIdentifier, int jobId, TaskType type, int id)
jtIdentifier - jobTracker identifierjobId - job numbertype - the TaskTypeid - the tip number@Deprecated 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@Deprecated 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()
TaskType.REDUCE, the ID to 0, and the job ID to an empty job ID.public JobID getJobID()
JobID object that this tip belongs to.@Deprecated public boolean isMap()
public TaskType getTaskType()
public int compareTo(ID o)
compareTo in interface Comparable<ID>compareTo in class IDo - the TaskID against which to compareprotected StringBuilder appendTo(StringBuilder builder)
builder - the builder to append topublic void readFields(DataInput in) throws IOException
Writablein.
For efficiency, implementations should attempt to re-use storage in the existing object where possible.
readFields in interface WritablereadFields in class IDin - DataInput to deseriablize this object from.IOException - any other problem for readFields.public void write(DataOutput out) throws IOException
Writableout.write in interface Writablewrite in class IDout - DataOuput to serialize this object into.IOException - any other problem for write.public static TaskID forName(String str) throws IllegalArgumentException
str - the target stringIllegalArgumentException - if the given string is malformedpublic static char getRepresentingCharacter(TaskType type)
TaskType.type - the TaskTypepublic static TaskType getTaskType(char c)
TaskType corresponding to the character.c - the characterCopyright © 2023 Apache Software Foundation. All rights reserved.