CheckpointBarrier (Flink : Runtime 2.0-preview1 API)

java.lang.Object
- org.apache.flink.runtime.event.AbstractEvent
- - org.apache.flink.runtime.event.RuntimeEvent
  - - org.apache.flink.runtime.io.network.api.CheckpointBarrier

All Implemented Interfaces:

org.apache.flink.core.io.IOReadableWritable
```
public class CheckpointBarrier
extends RuntimeEvent
```
Checkpoint barriers are used to align checkpoints throughout the streaming topology. The barriers are emitted by the sources when instructed to do so by the JobManager. When operators receive a CheckpointBarrier on one of its inputs, it knows that this is the point between the pre-checkpoint and post-checkpoint data.
Once an operator has received a checkpoint barrier from all its input channels, it knows that a certain checkpoint is complete. It can trigger the operator specific checkpoint behavior and broadcast the barrier to downstream operators.
Depending on the semantic guarantees, may hold off post-checkpoint data until the checkpoint is complete (exactly once).
The checkpoint barrier IDs are strictly monotonous increasing.

Constructor Summary

Constructors
Constructor Description

CheckpointBarrier(long id, long timestamp, CheckpointOptions checkpointOptions)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`CheckpointBarrier`	`asUnaligned()`
`boolean`	`equals(Object other)`
`CheckpointOptions`	`getCheckpointOptions()`
`long`	`getId()`
`long`	`getTimestamp()`
`int`	`hashCode()`
`boolean`	`isCheckpoint()`
`void`	`read(org.apache.flink.core.memory.DataInputView in)`
`String`	`toString()`
`CheckpointBarrier`	`withOptions(CheckpointOptions checkpointOptions)`
`void`	`write(org.apache.flink.core.memory.DataOutputView out)`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CheckpointBarrier

public CheckpointBarrier(long id,
                         long timestamp,
                         CheckpointOptions checkpointOptions)

Method Detail

getId
```
public long getId()
```

getTimestamp
```
public long getTimestamp()
```

getCheckpointOptions

public CheckpointOptions getCheckpointOptions()

withOptions

public CheckpointBarrier withOptions(CheckpointOptions checkpointOptions)

write

public void write(org.apache.flink.core.memory.DataOutputView out)
           throws IOException

Throws:: IOException

read

public void read(org.apache.flink.core.memory.DataInputView in)
          throws IOException

Throws:: IOException

hashCode
```
public int hashCode()
```
Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Overrides:: equals in class Object

toString
```
public String toString()
```
Overrides:

toString in class Object

isCheckpoint
```
public boolean isCheckpoint()
```

asUnaligned

public CheckpointBarrier asUnaligned()