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https://issues.apache.org/jira/browse/FLINK-9641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16641753#comment-16641753
]
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_r223340555
##########
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 {
Review comment:
Would it be better adding retry when ack failed?
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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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