org.apache.flink.streaming.api.functions.sink

Class PrintSink<IN>

java.lang.Object

org.apache.flink.streaming.api.functions.sink.PrintSink<IN>

Type Parameters:

IN - Input record type

All Implemented Interfaces:

Serializable, SupportsConcurrentExecutionAttempts, Sink<IN>

@PublicEvolving
public class PrintSink<IN>
extends Object
implements Sink<IN>, SupportsConcurrentExecutionAttempts

Sink implementation writing every element to the standard output or standard error stream.

Four possible format options:

• sinkIdentifier:subtaskIndex> output <- sinkIdentifier provided and parallelism > 1,
• sinkIdentifier> output <- sinkIdentifier provided and parallelism == 1
• subtaskIndex> output <- no sinkIdentifier provided and parallelism > 1
• output <- no sinkIdentifier provided and parallelism == 1

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.api.connector.sink2.Sink

Sink.InitContext

Constructor Summary

Constructors

Constructor and Description
PrintSink() Instantiates a print sink function that prints to STDOUT.
PrintSink(boolean stdErr) Instantiates a print sink that prints to STDOUT or STDERR.
PrintSink(String sinkIdentifier) Instantiates a print sink that prints to STDOUT and gives a sink identifier.
PrintSink(String sinkIdentifier, boolean stdErr) Instantiates a print sink that prints to STDOUT or STDERR and gives a sink identifier.

Method Summary

Modifier and Type	Method and Description
SinkWriter<IN>	createWriter(Sink.InitContext context) Creates a SinkWriter.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

PrintSink

public PrintSink()

Instantiates a print sink function that prints to STDOUT.

PrintSink

public PrintSink(boolean stdErr)

Instantiates a print sink that prints to STDOUT or STDERR.

Parameters:

stdErr - True, if the format should print to standard error instead of standard out.

PrintSink

public PrintSink(String sinkIdentifier)

Instantiates a print sink that prints to STDOUT and gives a sink identifier.

Parameters:

sinkIdentifier - Message that identifies the sink and is prefixed to the output of the value

PrintSink

public PrintSink(String sinkIdentifier,
                 boolean stdErr)

Instantiates a print sink that prints to STDOUT or STDERR and gives a sink identifier.

Parameters:

sinkIdentifier - Message that identifies the sink and is prefixed to the output of the value

stdErr - True if the sink should print to STDERR instead of STDOUT.

Method Detail

createWriter

public SinkWriter<IN> createWriter(Sink.InitContext context)
                            throws IOException

Description copied from interface: Sink

Creates a SinkWriter.

Specified by:

createWriter in interface Sink<IN>

Parameters:

context - the runtime context.

Returns:

A sink writer.

Throws:

IOException - for any failure during creation.

toString

public String toString()

Overrides:

toString in class Object