Github user tzulitai commented on a diff in the pull request:
https://github.com/apache/flink/pull/2369#discussion_r76268687
--- Diff:
flink-streaming-connectors/flink-connector-kafka-0.10/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer010.java
---
@@ -0,0 +1,399 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.connectors.kafka;
+
+import org.apache.flink.api.common.functions.IterationRuntimeContext;
+import org.apache.flink.api.common.functions.RichFunction;
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.java.typeutils.GenericTypeInfo;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.datastream.DataStreamSink;
+import
org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
+import org.apache.flink.streaming.api.functions.sink.SinkFunction;
+import org.apache.flink.streaming.api.operators.StreamSink;
+import
org.apache.flink.streaming.connectors.kafka.partitioner.FixedPartitioner;
+import
org.apache.flink.streaming.connectors.kafka.partitioner.KafkaPartitioner;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import
org.apache.flink.streaming.util.serialization.KeyedSerializationSchema;
+import
org.apache.flink.streaming.util.serialization.KeyedSerializationSchemaWrapper;
+import org.apache.flink.streaming.util.serialization.SerializationSchema;
+import org.apache.kafka.clients.producer.ProducerRecord;
+
+import java.util.Properties;
+
+import static
org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducerBase.getPropertiesFromBrokerList;
+
+
+/**
+ * Flink Sink to produce data into a Kafka topic. This producer is
compatible with Kafka 0.10.x
+ *
+ * Implementation note: This producer is a hybrid between a regular
regular sink function (a)
+ * and a custom operator (b).
+ *
+ * For (a), the class implements the SinkFunction and RichFunction
interfaces.
+ * For (b), it extends the StreamTask class.
+ *
+ * Details about approach (a):
+ *
+ * Pre Kafka 0.10 producers only follow approach (a), allowing users to
use the producer using the
+ * DataStream.addSink() method.
+ * Since the APIs exposed in that variant do not allow accessing the the
timestamp attached to the record
+ * the Kafka 0.10 producer has a section invocation option, approach (b).
+ *
+ * Details about approach (b):
+ * Kafka 0.10 supports writing the timestamp attached to a record to
Kafka. When adding the
+ * FlinkKafkaProducer010 using the FlinkKafkaProducer010.writeToKafka()
method, the Kafka producer
+ * can access the internal record timestamp of the record and write it to
Kafka.
+ *
+ * All methods and constructors in this class are marked with the approach
they are needed for.
+ */
+public class FlinkKafkaProducer010<T> extends StreamSink<T> implements
SinkFunction<T>, RichFunction {
+
+ /**
+ * Flag controlling whether we are writing the Flink record's timestamp
into Kafka.
+ */
+ private boolean writeTimestampToKafka = false;
+
+ // ---------------------- "Constructors" for timestamp writing
------------------
+
+ /**
+ * Creates a FlinkKafkaProducer for a given topic. The sink produces a
DataStream to
+ * the topic.
+ *
+ * This constructor allows writing timestamps to Kafka, it follow
approach (b) (see above)
+ *
+ * @param inStream The stream to write to Kafka
+ * @param topicId ID of the Kafka topic.
+ * @param serializationSchema User defined serialization schema
supporting key/value messages
+ * @param producerConfig Properties with the producer configuration.
+ */
+ public static <T> FlinkKafkaProducer010Configuration
writeToKafka(DataStream<T> inStream,
+
String topicId,
+
KeyedSerializationSchema<T> serializationSchema,
+
Properties producerConfig) {
+ return writeToKafka(inStream, topicId, serializationSchema,
producerConfig, new FixedPartitioner<T>());
+ }
+
+
+ /**
+ * Creates a FlinkKafkaProducer for a given topic. the sink produces a
DataStream to
+ * the topic.
+ *
+ * This constructor allows writing timestamps to Kafka, it follow
approach (b) (see above)
+ *
+ * @param inStream The stream to write to Kafka
+ * @param topicId ID of the Kafka topic.
+ * @param serializationSchema User defined (keyless) serialization
schema.
+ * @param producerConfig Properties with the producer configuration.
+ */
+ public static <T> FlinkKafkaProducer010Configuration
writeToKafka(DataStream<T> inStream,
+
String topicId,
+
SerializationSchema<T> serializationSchema,
+
Properties producerConfig) {
+ return writeToKafka(inStream, topicId, new
KeyedSerializationSchemaWrapper<>(serializationSchema), producerConfig, new
FixedPartitioner<T>());
+ }
+
+ /**
+ * Creates a FlinkKafkaProducer for a given topic. The sink produces a
DataStream to
+ * the topic.
+ *
+ * This constructor allows writing timestamps to Kafka, it follow
approach (b) (see above)
+ *
+ * @param inStream The stream to write to Kafka
+ * @param topicId The name of the target topic
+ * @param serializationSchema A serializable serialization schema for
turning user objects into a kafka-consumable byte[] supporting key/value
messages
+ * @param producerConfig Configuration properties for the
KafkaProducer. 'bootstrap.servers.' is the only required argument.
+ * @param customPartitioner A serializable partitioner for assigning
messages to Kafka partitions.
+ */
+ public static <T> FlinkKafkaProducer010Configuration<T>
writeToKafka(DataStream<T> inStream,
+
String topicId,
+
KeyedSerializationSchema<T>
serializationSchema,
+
Properties producerConfig,
+
KafkaPartitioner<T>
customPartitioner) {
+
+ GenericTypeInfo<Object> objectTypeInfo = new
GenericTypeInfo<>(Object.class);
+ FlinkKafkaProducer010<T> kafkaProducer = new
FlinkKafkaProducer010<>(topicId, serializationSchema, producerConfig,
customPartitioner);
+ SingleOutputStreamOperator<Object> transformation =
inStream.transform("FlinKafkaProducer 0.10.x", objectTypeInfo, kafkaProducer);
+ return new FlinkKafkaProducer010Configuration<>(transformation,
kafkaProducer);
+ }
+
+ // ---------------------- Regular constructors w/o timestamp support
------------------
+
+ /**
+ * Creates a FlinkKafkaProducer for a given topic. The sink produces a
DataStream to
+ * the topic.
+ *
+ * @param brokerList
+ * Comma separated addresses of the brokers
+ * @param topicId
+ * ID of the Kafka topic.
+ * @param serializationSchema
+ * User defined (keyless) serialization schema.
+ */
+ public FlinkKafkaProducer010(String brokerList, String topicId,
SerializationSchema<T> serializationSchema) {
+ this(topicId, new
KeyedSerializationSchemaWrapper<>(serializationSchema),
getPropertiesFromBrokerList(brokerList), new FixedPartitioner<T>());
+ }
+
+ /**
+ * Creates a FlinkKafkaProducer for a given topic. the sink produces a
DataStream to
+ * the topic.
+ *
+ * @param topicId
+ * ID of the Kafka topic.
+ * @param serializationSchema
+ * User defined (keyless) serialization schema.
+ * @param producerConfig
+ * Properties with the producer configuration.
+ */
+ public FlinkKafkaProducer010(String topicId, SerializationSchema<T>
serializationSchema, Properties producerConfig) {
+ this(topicId, new
KeyedSerializationSchemaWrapper<>(serializationSchema), producerConfig, new
FixedPartitioner<T>());
+ }
+
+ /**
+ * Creates a FlinkKafkaProducer for a given topic. the sink produces a
DataStream to
+ * the topic.
+ *
+ * @param topicId The topic to write data to
+ * @param serializationSchema A (keyless) serializable serialization
schema for turning user objects into a kafka-consumable byte[]
+ * @param producerConfig Configuration properties for the
KafkaProducer. 'bootstrap.servers.' is the only required argument.
+ * @param customPartitioner A serializable partitioner for assigning
messages to Kafka partitions (when passing null, we'll use Kafka's partitioner)
+ */
+ public FlinkKafkaProducer010(String topicId, SerializationSchema<T>
serializationSchema, Properties producerConfig, KafkaPartitioner<T>
customPartitioner) {
+ this(topicId, new
KeyedSerializationSchemaWrapper<>(serializationSchema), producerConfig,
customPartitioner);
+
--- End diff --
nit: unnecessary empty line
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