Package org.apache.flink.api.common

Class TaskInfo

java.lang.Object

org.apache.flink.api.common.TaskInfo

@Internal
public class TaskInfo
extends Object

Encapsulates task-specific information: name, index of subtask, parallelism and attempt number.

Constructor Summary

Constructors

Constructor	Description
TaskInfo(String taskName, int maxNumberOfParallelSubtasks, int indexOfSubtask, int numberOfParallelSubtasks, int attemptNumber)
TaskInfo(String taskName, int maxNumberOfParallelSubtasks, int indexOfSubtask, int numberOfParallelSubtasks, int attemptNumber, String allocationIDAsString)

Method Summary

Modifier and Type	Method	Description
String	getAllocationIDAsString()	Returns the allocation id for where this task is executed.
int	getAttemptNumber()	Gets the attempt number of this parallel subtask.
int	getIndexOfThisSubtask()	Gets the number of this parallel subtask.
int	getMaxNumberOfParallelSubtasks()	Gets the max parallelism aka the max number of subtasks.
int	getNumberOfParallelSubtasks()	Gets the parallelism with which the parallel task runs.
String	getTaskName()	Returns the name of the task
String	getTaskNameWithSubtasks()	Returns the name of the task, appended with the subtask indicator, such as "MyTask (3/6)#1", where 3 would be (getIndexOfThisSubtask() + 1), and 6 would be getNumberOfParallelSubtasks(), and 1 would be getAttemptNumber().

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TaskInfo

public TaskInfo(String taskName,
                int maxNumberOfParallelSubtasks,
                int indexOfSubtask,
                int numberOfParallelSubtasks,
                int attemptNumber)

TaskInfo

public TaskInfo(String taskName,
                int maxNumberOfParallelSubtasks,
                int indexOfSubtask,
                int numberOfParallelSubtasks,
                int attemptNumber,
                String allocationIDAsString)

Method Detail

getTaskName

public String getTaskName()

Returns the name of the task

Returns:

The name of the task

getMaxNumberOfParallelSubtasks

public int getMaxNumberOfParallelSubtasks()

Gets the max parallelism aka the max number of subtasks.

getIndexOfThisSubtask

public int getIndexOfThisSubtask()

Gets the number of this parallel subtask. The numbering starts from 0 and goes up to parallelism-1 (parallelism as returned by getNumberOfParallelSubtasks()).

Returns:

The index of the parallel subtask.

getNumberOfParallelSubtasks

public int getNumberOfParallelSubtasks()

Gets the parallelism with which the parallel task runs.

Returns:

The parallelism with which the parallel task runs.

getAttemptNumber

public int getAttemptNumber()

Gets the attempt number of this parallel subtask. First attempt is numbered 0. The attempt number corresponds to the number of times this task has been restarted(after failure/cancellation) since the job was initially started.

Returns:

Attempt number of the subtask.

getTaskNameWithSubtasks

public String getTaskNameWithSubtasks()

Returns the name of the task, appended with the subtask indicator, such as "MyTask (3/6)#1", where 3 would be (getIndexOfThisSubtask() + 1), and 6 would be getNumberOfParallelSubtasks(), and 1 would be getAttemptNumber().

Returns:

The name of the task, with subtask indicator.

getAllocationIDAsString

public String getAllocationIDAsString()

Returns the allocation id for where this task is executed.

Returns:

the allocation id for where this task is executed.