org.apache.flink.runtime.operators

类 DataSourceTask<OT>

java.lang.Object

org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

org.apache.flink.runtime.operators.DataSourceTask<OT>

public class DataSourceTask<OT>
extends AbstractInvokable

DataSourceTask which is executed by a task manager. The task reads data and uses an InputFormat to create records from the input.

另请参阅:

InputFormat

构造器概要

构造器

构造器和说明
DataSourceTask(Environment environment) Create an Invokable task and set its environment.

方法概要

限定符和类型	方法和说明
void	cancel() This method is called when a task is canceled either as a result of a user abort or an execution failure.
DistributedRuntimeUDFContext	createRuntimeContext()
void	invoke() Starts the execution.

从类继承的方法 org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

abortCheckpointOnBarrier, getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, notifyCheckpointCompleteAsync, setShouldInterruptOnCancel, shouldInterruptOnCancel, triggerCheckpointAsync, triggerCheckpointOnBarrier

从类继承的方法 java.lang.Object

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

构造器详细资料

DataSourceTask

public DataSourceTask(Environment environment)

Create an Invokable task and set its environment.

参数:

environment - The environment assigned to this invokable.

方法详细资料

invoke

public void invoke()
            throws Exception

从类复制的说明: AbstractInvokable

Starts the execution.

Must be overwritten by the concrete task implementation. This method is called by the task manager when the actual execution of the task starts.

All resources should be cleaned up when the method returns. Make sure to guard the code with try-finally blocks where necessary.

指定者:

invoke 在类中 AbstractInvokable

抛出:

Exception - Tasks may forward their exceptions for the TaskManager to handle through failure/recovery.

cancel

public void cancel()
            throws Exception

从类复制的说明: AbstractInvokable

This method is called when a task is canceled either as a result of a user abort or an execution failure. It can be overwritten to respond to shut down the user code properly.

覆盖:

cancel 在类中 AbstractInvokable

抛出:

Exception - thrown if any exception occurs during the execution of the user code

createRuntimeContext

public DistributedRuntimeUDFContext createRuntimeContext()