Package org.apache.kafka.connect.sink

Class SinkConnector

java.lang.Object

org.apache.kafka.connect.connector.Connector

org.apache.kafka.connect.sink.SinkConnector

All Implemented Interfaces:

Versioned

Direct Known Subclasses:

MockSinkConnector, VerifiableSinkConnector

public abstract class SinkConnector
extends Connector

SinkConnectors implement the Connector interface to send Kafka data to another system.

Kafka Connect may discover implementations of this interface using the Java ServiceLoader mechanism. To support this, implementations of this interface should also contain a service provider configuration file in META-INF/services/org.apache.kafka.connect.sink.SinkConnector.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	TOPICS_CONFIG	Configuration key for the list of input topics for this connector.

Constructor Summary

Constructors

Constructor	Description
SinkConnector()

Method Summary

Modifier and Type	Method	Description
boolean	alterOffsets(Map<String,String> connectorConfig, Map<TopicPartition,Long> offsets)	Invoked when users request to manually alter/reset the offsets for this connector via the Connect worker's REST API.

Methods inherited from class org.apache.kafka.connect.connector.Connector

config, initialize, initialize, reconfigure, start, stop, taskClass, taskConfigs, validate

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.kafka.connect.components.Versioned

version

Field Details

TOPICS_CONFIG

public static final String TOPICS_CONFIG

Configuration key for the list of input topics for this connector.

Usually this setting is only relevant to the Kafka Connect framework, but is provided here for the convenience of Connector developers if they also need to know the set of topics.

See Also:

• Constant Field Values

Constructor Details

SinkConnector

public SinkConnector()

Method Details

alterOffsets

public boolean alterOffsets(Map<String,String> connectorConfig,
 Map<TopicPartition,Long> offsets)

Invoked when users request to manually alter/reset the offsets for this connector via the Connect worker's REST API. Connectors that manage offsets externally can propagate offset changes to their external system in this method. Connectors may also validate these offsets if, for example, an offset is out of range for what can be feasibly written to the external system.

Connectors that neither manage offsets externally nor require custom offset validation need not implement this method beyond simply returning true.

User requests to alter/reset offsets will be handled by the Connect runtime and will be reflected in the offsets for this connector's consumer group.

Note that altering / resetting offsets is expected to be an idempotent operation and this method should be able to handle being called more than once with the same arguments (which could occur if a user retries the request due to a failure in altering the consumer group offsets, for example).

Similar to validate, this method may be called by the runtime before the start method is invoked.

Parameters:

connectorConfig - the configuration of the connector

offsets - a map from topic partition to offset, containing the offsets that the user has requested to alter/reset. For any topic partitions whose offsets are being reset instead of altered, their corresponding value in the map will be null. This map may be empty, but never null. An empty offsets map could indicate that the offsets were reset previously or that no offsets have been committed yet.

Returns:

whether this method has been overridden by the connector; the default implementation returns false, and all other implementations (that do not unconditionally throw exceptions) should return true

Throws:

UnsupportedOperationException - if it is impossible to alter/reset the offsets for this connector

ConnectException - if the offsets for this connector cannot be reset for any other reason (for example, they have failed custom validation logic specific to this connector)

Since:

3.6