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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9641) Pulsar Source Connector
Date Mon, 08 Oct 2018 12:29:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16641755#comment-16641755
] 

ASF GitHub Bot commented on FLINK-9641:
---------------------------------------

zjuwangg commented on a change in pull request #6200: [FLINK-9641] [streaming-connectors]
Flink pulsar source connector
URL: https://github.com/apache/flink/pull/6200#discussion_r223342019
 
 

 ##########
 File path: flink-connectors/flink-connector-pulsar/src/main/java/org/apache/flink/streaming/connectors/pulsar/PulsarConsumerSource.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.streaming.connectors.pulsar;
+
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.source.MessageAcknowledgingSourceBase;
+import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
+import org.apache.flink.util.IOUtils;
+
+import org.apache.pulsar.client.api.Consumer;
+import org.apache.pulsar.client.api.Message;
+import org.apache.pulsar.client.api.MessageId;
+import org.apache.pulsar.client.api.PulsarClient;
+import org.apache.pulsar.client.api.PulsarClientException;
+import org.apache.pulsar.client.api.SubscriptionType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Pulsar source (consumer) which receives messages from a topic and acknowledges messages.
+ * When checkpointing is enabled, it guarantees at least once processing semantics.
+ *
+ * <p>When checkpointing is disabled, it auto acknowledges messages based on the number
of messages it has
+ * received. In this mode messages may be dropped.
+ */
+class PulsarConsumerSource<T> extends MessageAcknowledgingSourceBase<T, MessageId>
implements PulsarSourceBase<T> {
+
+	private static final Logger LOG = LoggerFactory.getLogger(PulsarConsumerSource.class);
+
+	private final int messageReceiveTimeoutMs = 100;
+	private final String serviceUrl;
+	private final String topic;
+	private final String subscriptionName;
+	private final DeserializationSchema<T> deserializer;
+
+	private PulsarClient client;
+	private Consumer<byte[]> consumer;
+
+	private boolean isCheckpointingEnabled;
+
+	private final long acknowledgementBatchSize;
+	private long batchCount;
+	private long totalMessageCount;
+
+	private transient volatile boolean isRunning;
+
+	PulsarConsumerSource(PulsarSourceBuilder<T> builder) {
+		super(MessageId.class);
+		this.serviceUrl = builder.serviceUrl;
+		this.topic = builder.topic;
+		this.deserializer = builder.deserializationSchema;
+		this.subscriptionName = builder.subscriptionName;
+		this.acknowledgementBatchSize = builder.acknowledgementBatchSize;
+	}
+
+	@Override
+	public void open(Configuration parameters) throws Exception {
+		super.open(parameters);
+
+		final RuntimeContext context = getRuntimeContext();
+		if (context instanceof StreamingRuntimeContext) {
+			isCheckpointingEnabled = ((StreamingRuntimeContext) context).isCheckpointingEnabled();
+		}
+
+		client = createClient();
+		consumer = createConsumer(client);
+
+		isRunning = true;
+	}
+
+	@Override
+	protected void acknowledgeIDs(long checkpointId, Set<MessageId> messageIds) {
+		if (consumer == null) {
+			LOG.error("null consumer unable to acknowledge messages");
+			throw new RuntimeException("null pulsar consumer unable to acknowledge messages");
+		}
+
+		if (messageIds.isEmpty()) {
+			LOG.info("no message ids to acknowledge");
+			return;
+		}
+
+		Map<String, CompletableFuture<Void>> futures = new HashMap<>(messageIds.size());
+		for (MessageId id : messageIds) {
+			futures.put(id.toString(), consumer.acknowledgeAsync(id));
+		}
+
+		futures.forEach((k, f) -> {
+			try {
+				f.get();
+			} catch (Exception e) {
+				LOG.error("failed to acknowledge messageId " + k, e);
+				throw new RuntimeException("Messages could not be acknowledged during checkpoint creation.",
e);
+			}
+		});
+	}
+
+	@Override
+	public void run(SourceContext<T> context) throws Exception {
+		Message message;
+		while (isRunning) {
+			message = consumer.receive(messageReceiveTimeoutMs, TimeUnit.MILLISECONDS);
+			if (message == null) {
+				LOG.info("unexpected null message");
+				continue;
+			}
+
+			if (isCheckpointingEnabled) {
+				emitCheckpointing(context, message);
+			} else {
+				emitAutoAcking(context, message);
+			}
+		}
+	}
+
+	private void emitCheckpointing(SourceContext<T> context, Message message) throws IOException
{
+		synchronized (context.getCheckpointLock()) {
+			if (!addId(message.getMessageId())) {
 
 Review comment:
   sry, but i don't find the detail or interface of addId method

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> Pulsar Source Connector
> -----------------------
>
>                 Key: FLINK-9641
>                 URL: https://issues.apache.org/jira/browse/FLINK-9641
>             Project: Flink
>          Issue Type: New Feature
>          Components: Streaming Connectors
>            Reporter: Chris Kellogg
>            Priority: Minor
>              Labels: pull-request-available
>
> Pulsar (https://github.com/apache/incubator-pulsar) is a distributed pub-sub messaging
system currently in apache incubation. It is a very active project and there are committers
from various companies and good adoption. This pr will add a source function to allow Flink
jobs to process messages from Pulsar topics.
>  



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