org.apache.tez.dag.records
Class TezTaskAttemptID

java.lang.Object
  org.apache.tez.dag.records.TezID
      org.apache.tez.dag.records.TezTaskAttemptID

All Implemented Interfaces:

Comparable<TezID>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable<TezID>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class TezTaskAttemptID
extends TezID

TezTaskAttemptID represents the immutable and unique identifier for a task attempt. Each task attempt is one particular instance of a Tez Task identified by its TezTaskID. TezTaskAttemptID consists of 2 parts. First part is the TezTaskID, that this TaskAttemptID belongs to. Second part is the task attempt number.

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

See Also:

TezTaskID

Field Summary

static String	ATTEMPT
protected static ThreadLocal<NumberFormat>	tezTaskAttemptIdFormat

Fields inherited from class org.apache.tez.dag.records.TezID

id, SEPARATOR

Constructor Summary

TezTaskAttemptID()

Method Summary

protected StringBuilder	appendTo(StringBuilder builder) Add the unique string to the StringBuilder
int	compareTo(TezID o) Compare TaskIds by first tipIds, then by task numbers.
boolean	equals(Object o)
static TezTaskAttemptID	fromString(String taIdStr)
static TezTaskAttemptID	getInstance(TezTaskID taskID, int id) Constructs a TaskAttemptID object from given TezTaskID.
TezTaskID	getTaskID() Returns the TezTaskID object that this task attempt belongs to
int	hashCode()
void	readFields(DataInput in)
static TezTaskAttemptID	readTezTaskAttemptID(DataInput in)
String	toString()
void	write(DataOutput out)

Methods inherited from class org.apache.tez.dag.records.TezID

getId, readID

Methods inherited from class java.lang.Object

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

Field Detail

ATTEMPT

public static final String ATTEMPT

See Also:

Constant Field Values

tezTaskAttemptIdFormat

protected static final ThreadLocal<NumberFormat> tezTaskAttemptIdFormat

Constructor Detail

TezTaskAttemptID

public TezTaskAttemptID()

Method Detail

getInstance

public static TezTaskAttemptID getInstance(TezTaskID taskID,
                                           int id)

Constructs a TaskAttemptID object from given TezTaskID.

Parameters:

taskID - TaskID that this task belongs to

id - the task attempt number

getTaskID

public TezTaskID getTaskID()

Returns the TezTaskID object that this task attempt belongs to

equals

public boolean equals(Object o)

Overrides:

equals in class TezID

appendTo

protected StringBuilder appendTo(StringBuilder builder)

Add the unique string to the StringBuilder

Parameters:

builder - the builder to append ot

Returns:

the builder that was passed in.

hashCode

public int hashCode()

Overrides:

hashCode in class TezID

compareTo

public int compareTo(TezID o)

Compare TaskIds by first tipIds, then by task numbers.

Specified by:

compareTo in interface Comparable<TezID>

Overrides:

compareTo in class TezID

toString

public String toString()

Overrides:

toString in class TezID

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Overrides:

readFields in class TezID

Throws:

IOException

readTezTaskAttemptID

public static TezTaskAttemptID readTezTaskAttemptID(DataInput in)
                                             throws IOException

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Overrides:

write in class TezID

Throws:

IOException

fromString

public static TezTaskAttemptID fromString(String taIdStr)