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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9311) PubSub connector
Date Fri, 02 Nov 2018 08:15:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16672729#comment-16672729

ASF GitHub Bot commented on FLINK-9311:

zentol commented on a change in pull request #6594: [FLINK-9311] [pubsub] Added PubSub source
connector with support for checkpointing (ATLEAST_ONCE)
URL: https://github.com/apache/flink/pull/6594#discussion_r230294657

 File path: flink-connectors/flink-connector-pubsub/src/main/java/org/apache/flink/streaming/connectors/pubsub/PubSubSource.java
 @@ -0,0 +1,315 @@
+ * 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.pubsub;
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.common.functions.StoppableFunction;
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.api.java.typeutils.ResultTypeQueryable;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.source.MultipleIdsMessageAcknowledgingSourceBase;
+import org.apache.flink.streaming.api.functions.source.ParallelSourceFunction;
+import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
+import org.apache.flink.streaming.connectors.pubsub.common.PubSubSubscriberFactory;
+import org.apache.flink.streaming.connectors.pubsub.common.SerializableCredentialsProvider;
+import com.google.api.gax.core.CredentialsProvider;
+import com.google.auth.Credentials;
+import com.google.cloud.pubsub.v1.AckReplyConsumer;
+import com.google.cloud.pubsub.v1.Subscriber;
+import com.google.pubsub.v1.ProjectSubscriptionName;
+import com.google.pubsub.v1.PubsubMessage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import java.io.IOException;
+import java.util.List;
+import java.util.Optional;
+ * PubSub Source, this Source will consume PubSub messages from a subscription and Acknowledge
them as soon as they have been received.
 Review comment:
   I'll need a bit of background here. Let's say that the sources consumes a PubSub message,
acknowledges it, and the job subsequently fails and restarts.
   In this case, will the message be consumed again? If not, to my understanding, then the
source does not provide at-least-once guarantees.

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> PubSub connector
> ----------------
>                 Key: FLINK-9311
>                 URL: https://issues.apache.org/jira/browse/FLINK-9311
>             Project: Flink
>          Issue Type: New Feature
>          Components: Streaming Connectors
>            Reporter: Richard Deurwaarder
>            Assignee: Niels Basjes
>            Priority: Minor
>              Labels: pull-request-available
> I would like start adding some google cloud connectors starting with a PubSub Source.
I have a basic implementation ready but I want it to be able to:
>  * easily scale up (should I have it extend RichParallelSourceFunction for this?)
>  * Make it easier to provide the google cloud credentials. This would require being able
to send some json string / ServiceAccount to the nodes when starting up this source.
> CouldĀ this be something that would be useful for others and added to the flink connectors

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