org.apache.flume
Interface Sink

All Superinterfaces:

LifecycleAware, NamedComponent

All Known Implementing Classes:

AbstractSink, AsyncHBaseSink, AvroSink, ElasticSearchSink, HBaseSink, HDFSEventSink, IRCSink, LoggerSink, NullSink, RollingFileSink

@InterfaceAudience.Public
@InterfaceStability.Stable
public interface Sink
extends LifecycleAware, NamedComponent

A sink is connected to a Channel and consumes its contents, sending them to a configured destination that may vary according to the sink type.

Sinks can be grouped together for various behaviors using SinkGroup and SinkProcessor. They are polled periodically by a SinkRunner via the processor

Sinks are associated with unique names that can be used for separating configuration and working namespaces.

While the process() call is guaranteed to only be accessed by a single thread, other calls may be concurrently accessed and should thus be protected.

See Also:

Channel, SinkProcessor, SinkRunner

Nested Class Summary

static class

Sink.Status

Method Summary

Channel	getChannel()
Sink.Status	process() Requests the sink to attempt to consume data from attached channel
void	setChannel(Channel channel) Sets the channel the sink will consume from

Methods inherited from interface org.apache.flume.lifecycle.LifecycleAware

getLifecycleState, start, stop

Methods inherited from interface org.apache.flume.NamedComponent

getName, setName

Method Detail

setChannel

void setChannel(Channel channel)

Sets the channel the sink will consume from

Parameters:

channel - The channel to be polled

getChannel

Channel getChannel()

Returns:

the channel associated with this sink

process

Sink.Status process()
                    throws EventDeliveryException

Requests the sink to attempt to consume data from attached channel

Note: This method should be consuming from the channel within the bounds of a Transaction. On successful delivery, the transaction should be committed, and on failure it should be rolled back.

Returns:

READY if 1 or more Events were successfully delivered, BACKOFF if no data could be retrieved from the channel feeding this sink

Throws:

EventDeliveryException - In case of any kind of failure to deliver data to the next hop destination.