[ 
https://issues.apache.org/jira/browse/BAHIR-116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15994560#comment-15994560
 ] 

ASF GitHub Bot commented on BAHIR-116:
--------------------------------------

Github user amarouni commented on a diff in the pull request:

    https://github.com/apache/bahir/pull/42#discussion_r114503784
  
    --- Diff: 
streaming-pubsub/examples/src/main/scala/org.apache.spark.examples.streaming.pubsub/PubsubWordCount.scala
 ---
    @@ -0,0 +1,150 @@
    +/*
    + * 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.
    + */
    +
    +// scalastyle:off println
    +package org.apache.spark.examples.streaming.pubsub
    +
    +import scala.collection.JavaConverters._
    +import scala.util.Random
    +
    +import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport
    +import com.google.api.client.json.jackson2.JacksonFactory
    +import com.google.api.services.pubsub.Pubsub.Builder
    +import com.google.api.services.pubsub.model.PublishRequest
    +import com.google.api.services.pubsub.model.PubsubMessage
    +import com.google.cloud.hadoop.util.RetryHttpInitializer
    +
    +import org.apache.spark.storage.StorageLevel
    +import org.apache.spark.streaming.pubsub.ConnectionUtils
    +import org.apache.spark.streaming.pubsub.PubsubTestUtils
    +import org.apache.spark.streaming.pubsub.PubsubUtils
    +import org.apache.spark.streaming.pubsub.SparkGCPCredentials
    +import org.apache.spark.streaming.Milliseconds
    +import org.apache.spark.streaming.StreamingContext
    +import org.apache.spark.SparkConf
    +
    +/**
    + * Consumes messages from a Google Cloud Pub/Sub subscription and does 
wordcount.
    + * In this example it use application default credentials, so need to use 
gcloud
    + * client to generate token file before running example
    + *
    + * Usage: PubsubWordCount <projectId> <subscription>
    + *   <projectId> is the name of Google cloud
    + *   <subscription> is the subscription to a topic
    + *
    + * Example:
    + *  # use gcloud client generate token file
    + *  $ gcloud init
    + *  $ gcloud auth application-default login
    + *
    + *  # run the example
    + *  $ bin/run-example \
    + *      org.apache.spark.examples.streaming.pubsub.PubsubWordCount 
project_1 subscription_1
    + *
    + */
    +object PubsubWordCount {
    +  def main(args: Array[String]): Unit = {
    +    if (args.length != 2) {
    +      System.err.println(
    +        """
    +          |Usage: PubsubWordCount <projectId> <subscription>
    +          |
    +          |     <projectId> is the name of Google cloud
    +          |     <subscription> is the subscription to a topic
    +          |
    +        """.stripMargin)
    +      System.exit(1)
    +    }
    +
    +    val Seq(projectId, subscription) = args.toSeq
    +
    +    val sparkConf = new SparkConf().setAppName("PubsubWordCount")
    +    val ssc = new StreamingContext(sparkConf, Milliseconds(2000))
    +
    +    val pubsubStream = PubsubUtils.createStream(ssc, projectId, 
subscription,
    --- End diff --
    
    It might be more helpful to type this variable, this gives the users any 
idea of the DStream type. As most users will use this example as the starting 
point for using the connector.


> Add Spark streaming connector for Google cloud Pub/Sub
> ------------------------------------------------------
>
>                 Key: BAHIR-116
>                 URL: https://issues.apache.org/jira/browse/BAHIR-116
>             Project: Bahir
>          Issue Type: New Feature
>          Components: Spark Streaming Connectors
>            Reporter: Bin Chen
>
> A spark streaming connector for [Google 
> Pub/Sub|https://cloud.google.com/pubsub/] 



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