T
- Type of the elements produced by the source functionCD
- The type of the data stored in the checkpoint by the master that triggers@PublicEvolving public interface ExternallyInducedSource<T,CD> extends SourceFunction<T>, WithMasterCheckpointHook<CD>
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.
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. |
SourceFunction.SourceContext<T>
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.
|
cancel, run
createMasterTriggerRestoreHook
void setCheckpointTrigger(ExternallyInducedSource.CheckpointTrigger checkpointTrigger)
checkpointTrigger
- The checkpoint trigger to setCopyright © 2014–2022 The Apache Software Foundation. All rights reserved.