lakshmi-manasa-g commented on a change in pull request #71: SAMZA-2437: Sample for producing to Azure Blob Storage URL: https://github.com/apache/samza-hello-samza/pull/71#discussion_r371926907
########## File path: src/main/java/samza/examples/azure/AzureBlobApplication.java ########## @@ -0,0 +1,136 @@ +/* + * 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 samza.examples.azure; + +import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableMap; +import java.util.List; +import java.util.Map; +import org.apache.samza.application.StreamApplication; +import org.apache.samza.application.descriptors.StreamApplicationDescriptor; +import org.apache.samza.operators.MessageStream; +import org.apache.samza.operators.OutputStream; +import org.apache.samza.serializers.JsonSerdeV2; +import org.apache.samza.serializers.NoOpSerde; +import org.apache.samza.system.descriptors.GenericOutputDescriptor; +import org.apache.samza.system.descriptors.GenericSystemDescriptor; +import org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor; +import org.apache.samza.system.kafka.descriptors.KafkaSystemDescriptor; +import samza.examples.azure.data.PageViewAvroRecord; +import samza.examples.cookbook.data.PageView; + +/** + * In this example, we demonstrate sending blobs to Azure Blob Storage. + * This Samza job reads from Kafka topic "page-view-azure-blob-input" and produces blobs to Azure-Container "oss-testcontainer" in your Azure Storage account. + * + * Currently, Samza supports sending Avro files are blobs. + * Hence the incoming messages into the Samza job have to be converted to an Avro record. + * For this job, we use input message as {@link samza.examples.cookbook.data.PageView} and + * covert it to an Avro record defined as {@link samza.examples.azure.data.PageViewAvroRecord}. + * + * To run the below example: + * + * <ol> + * <li> + * Replace your-azure-storage-account-name and your-azure-storage-account-key with details of your Azure Storage Account. + * </li> + * <li> + * Ensure that the topic "page-view-azure-blob-input" is created <br/> + * ./deploy/kafka/bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic page-view-azure-blob-input --partitions 1 --replication-factor 1 + * </li> + * <li> + * Run the application using the run-app.sh script <br/> + * ./deploy/samza/bin/run-app.sh --config-factory=org.apache.samza.config.factories.PropertiesConfigFactory --config-path=file://$PWD/deploy/samza/config/azure-blob-application.properties + * </li> + * <li> + * Produce some messages to the "page-view-azure-blob-input" topic <br/> + * ./deploy/kafka/bin/kafka-console-producer.sh --topic page-view-azure-blob-input --broker-list localhost:9092 <br/> + * {"userId": "user1", "country": "india", "pageId":"google.com"} <br/> + * {"userId": "user2", "country": "france", "pageId":"facebook.com"} <br/> + * {"userId": "user3", "country": "china", "pageId":"yahoo.com"} <br/> + * {"userId": "user4", "country": "italy", "pageId":"linkedin.com"} <br/> + * {"userId": "user5", "country": "germany", "pageId":"amazon.com"} <br/> + * {"userId": "user6", "country": "denmark", "pageId":"apple.com"} <br/> + * </li> + * <li> + * Seeing Output: + * <ol> + * <li> + * See blobs in your Azure portal at https://<azure-storage-account-name>.blob.core.windows.net/oss-testcontainer/PageViewEventStream/<time-stamp>.avro + * </li> + * <li> + * system-name "oss-testcontainer" in configs and code below maps to Azure-Container in Azure Storage account. + * </li> + * <li> + * <time-stamp> is of the format yyyy/MM/dd/HH/mm-ss-randomString.avro. Hence navigate through the virtual folders on the portal to see your blobs. + * </li> + * <li> + * Due to network calls, allow a few minutes for blobs to appear on the portal. + * </li> + * <li> + * Config "maxMessagesPerBlob=2" ensures that a blob is created per 2 input messages. Adjust input or config accordingly. + * </li> + * </ol> + * </li> + * </ol> + */ +public class AzureBlobApplication implements StreamApplication { + private static final List<String> KAFKA_CONSUMER_ZK_CONNECT = ImmutableList.of("localhost:2181"); + private static final List<String> KAFKA_PRODUCER_BOOTSTRAP_SERVERS = ImmutableList.of("localhost:9092"); + private static final Map<String, String> KAFKA_DEFAULT_STREAM_CONFIGS = ImmutableMap.of("replication.factor", "1"); + private static final String INPUT_PAGEVIEW_STREAM_ID = "page-view-azure-blob-input"; + private static final String OUTPUT_SYSTEM = "oss-testcontainer"; + private static final String OUTPUT_STREAM = "PageViewEventStream"; + + @Override + public void describe(StreamApplicationDescriptor appDescriptor) { + // Define a system descriptor for Kafka + KafkaSystemDescriptor kafkaSystemDescriptor = + new KafkaSystemDescriptor("kafka").withConsumerZkConnect(KAFKA_CONSUMER_ZK_CONNECT) + .withProducerBootstrapServers(KAFKA_PRODUCER_BOOTSTRAP_SERVERS) + .withDefaultStreamConfigs(KAFKA_DEFAULT_STREAM_CONFIGS); + + KafkaInputDescriptor<PageView> pageViewInputDescriptor = + kafkaSystemDescriptor.getInputDescriptor(INPUT_PAGEVIEW_STREAM_ID, new JsonSerdeV2<>(PageView.class)); + + // Define a system descriptor for Azure Blob Storage + GenericSystemDescriptor azureBlobSystemDescriptor = + new GenericSystemDescriptor(OUTPUT_SYSTEM, "org.apache.samza.system.azureblob.AzureBlobSystemFactory"); Review comment: I did write a system descriptor for Azure Blob but then it was not a lot more than the generic system descriptor and hence decided to use the existing generic system descriptor itself. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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