syhily commented on a change in pull request #17452: URL: https://github.com/apache/flink/pull/17452#discussion_r799718395
########## File path: flink-connectors/flink-connector-pulsar/src/main/java/org/apache/flink/connector/pulsar/sink/writer/PulsarWriter.java ########## @@ -0,0 +1,203 @@ +/* + * 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.connector.pulsar.sink.writer; + +import org.apache.flink.api.common.operators.MailboxExecutor; +import org.apache.flink.api.common.operators.ProcessingTimeService; +import org.apache.flink.api.common.serialization.SerializationSchema.InitializationContext; +import org.apache.flink.api.connector.sink2.Sink.InitContext; +import org.apache.flink.api.connector.sink2.TwoPhaseCommittingSink.PrecommittingSinkWriter; +import org.apache.flink.connector.base.DeliveryGuarantee; +import org.apache.flink.connector.pulsar.sink.committer.PulsarCommittable; +import org.apache.flink.connector.pulsar.sink.config.SinkConfiguration; +import org.apache.flink.connector.pulsar.sink.writer.context.PulsarSinkContext; +import org.apache.flink.connector.pulsar.sink.writer.context.PulsarSinkContextAdapter; +import org.apache.flink.connector.pulsar.sink.writer.message.RawMessage; +import org.apache.flink.connector.pulsar.sink.writer.router.TopicRouter; +import org.apache.flink.connector.pulsar.sink.writer.serializer.PulsarSerializationSchema; +import org.apache.flink.connector.pulsar.sink.writer.topic.TopicMetadataListener; +import org.apache.flink.connector.pulsar.sink.writer.topic.TopicProducerRegister; +import org.apache.flink.util.FlinkRuntimeException; +import org.apache.flink.util.function.SerializableFunction; + +import org.apache.pulsar.client.api.MessageId; +import org.apache.pulsar.client.api.Producer; +import org.apache.pulsar.client.api.TypedMessageBuilder; +import org.apache.pulsar.client.api.transaction.Transaction; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.Collection; +import java.util.List; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.Semaphore; + +import static java.util.Collections.emptyList; +import static org.apache.flink.util.IOUtils.closeAll; + +/** + * This class is responsible to write records in a Pulsar topic and to handle the different delivery + * {@link DeliveryGuarantee}s. + * + * @param <IN> The type of the input elements. + */ +public class PulsarWriter<IN> implements PrecommittingSinkWriter<IN, PulsarCommittable> { + private static final Logger LOG = LoggerFactory.getLogger(PulsarWriter.class); + + private final SinkConfiguration sinkConfiguration; + private final DeliveryGuarantee deliveryGuarantee; + private final PulsarSerializationSchema<IN> serializationSchema; + private final TopicRouter<IN> topicRouter; + private final PulsarSinkContextAdapter sinkContextAdapter; + private final TopicMetadataListener metadataListener; + private final MailboxExecutor mailboxExecutor; + private final TopicProducerRegister producerRegister; + private final Semaphore pendingMessages; + + /** + * Constructor creating a Pulsar writer. + * + * <p>It will throw a {@link RuntimeException} if {@link + * PulsarSerializationSchema#open(InitializationContext, PulsarSinkContext, SinkConfiguration)} + * fails. + * + * @param sinkConfiguration the configuration to configure the Pulsar producer. + * @param serializationSchema serialize to transform the incoming records to {@link RawMessage}. + * @param metadataListener the listener for querying topic metadata. + * @param topicRouterProvider create related topic router to choose topic by incoming records. + * @param initContext context to provide information about the runtime environment. + */ + public PulsarWriter( + SinkConfiguration sinkConfiguration, + PulsarSerializationSchema<IN> serializationSchema, + TopicMetadataListener metadataListener, + SerializableFunction<SinkConfiguration, TopicRouter<IN>> topicRouterProvider, + InitContext initContext) { + this.sinkConfiguration = sinkConfiguration; + this.deliveryGuarantee = sinkConfiguration.getDeliveryGuarantee(); + this.serializationSchema = serializationSchema; + this.topicRouter = topicRouterProvider.apply(sinkConfiguration); + this.sinkContextAdapter = new PulsarSinkContextAdapter(initContext, sinkConfiguration); + this.metadataListener = metadataListener; + this.mailboxExecutor = initContext.getMailboxExecutor(); + + // Initialize topic metadata listener. + LOG.debug("Initialize topic metadata after creating Pulsar writer."); + ProcessingTimeService timeService = initContext.getProcessingTimeService(); + metadataListener.open(sinkConfiguration, timeService); + + // Initialize topic router. + topicRouter.open(sinkConfiguration); + + // Initialize the serialization schema. + try { + InitializationContext initializationContext = + initContext.asSerializationSchemaInitializationContext(); + serializationSchema.open(initializationContext, sinkContextAdapter, sinkConfiguration); + } catch (Exception e) { + throw new FlinkRuntimeException("Cannot initialize schema.", e); + } + + // Create this producer register after opening serialization schema! + this.producerRegister = new TopicProducerRegister(sinkConfiguration, serializationSchema); + this.pendingMessages = new Semaphore(sinkConfiguration.getMaxPendingMessages()); + } + + @Override + @SuppressWarnings("unchecked") + public void write(IN element, Context context) throws IOException, InterruptedException { + // Serialize the incoming element. + sinkContextAdapter.updateTimestamp(context); + RawMessage<byte[]> message = serializationSchema.serialize(element, sinkContextAdapter); + + // Choose the right topic to send. + List<String> availableTopics = metadataListener.availableTopics(); + String topic = topicRouter.route(element, message, availableTopics, sinkContextAdapter); + + // Create message builder for sending message. + TypedMessageBuilder<?> builder = createMessageBuilder(topic, deliveryGuarantee); Review comment: Can you clarify this? How could the situation you mentioned happen? Pulsar Transaction is a bit different compared to Kafka. Pulsar doesn't bind the Transaction to any Producer or Topic. You can create the transaction for your own needs. Publish or Consume messages from this transaction. The transaction is just a flag to mark the operation log. We have to refinement the transaction usage in the Pulsar sink. Every topic would only have one live transaction between the Flink checkpoint. And since the transaction is just a mark we can reuse it by the `TxnID`. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
