org.apache.flink.streaming.api.checkpoint

接口 ExternallyInducedSource<T,CD>

类型参数:

T - Type of the elements produced by the source function

CD - The type of the data stored in the checkpoint by the master that triggers

所有超级接口:

org.apache.flink.api.common.functions.Function, Serializable, SourceFunction<T>, WithMasterCheckpointHook<CD>

@PublicEvolving
public interface ExternallyInducedSource<T,CD>
extends SourceFunction<T>, WithMasterCheckpointHook<CD>

Sources that implement this interface do not trigger checkpoints when receiving a trigger message from the checkpoint coordinator, but when their input data/events indicate that a checkpoint should be triggered.

Since sources cannot simply create a new checkpoint on their own, this mechanism always goes together with a hook on the master side. In a typical setup, the hook on the master tells the source system (for example the message queue) to prepare a checkpoint. The exact point when the checkpoint is taken is then controlled by the event stream received from the source, and triggered by the source function (implementing this interface) in Flink when seeing the relevant events.

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	ExternallyInducedSource.CheckpointTrigger Through the CheckpointTrigger, the source function notifies the Flink source operator when to trigger the checkpoint.

从接口继承的嵌套类/接口 org.apache.flink.streaming.api.functions.source.SourceFunction

SourceFunction.SourceContext<T>

方法概要

限定符和类型	方法和说明
void	setCheckpointTrigger(ExternallyInducedSource.CheckpointTrigger checkpointTrigger) Sets the checkpoint trigger through which the source can trigger the checkpoint.

从接口继承的方法 org.apache.flink.streaming.api.functions.source.SourceFunction

cancel, run

从接口继承的方法 org.apache.flink.streaming.api.checkpoint.WithMasterCheckpointHook

createMasterTriggerRestoreHook

方法详细资料

setCheckpointTrigger

void setCheckpointTrigger(ExternallyInducedSource.CheckpointTrigger checkpointTrigger)

Sets the checkpoint trigger through which the source can trigger the checkpoint.

参数:

checkpointTrigger - The checkpoint trigger to set