Apache-Kafka-Producer-Consumer-Example Requirement. You can check out the whole project on my GitHub page. Kafka Consumer with Example Java Application. Apache Kafka is written with Scala. Conclusion Kafka Consumer Example. value.deserializer=org.apache.kafka.common.serialization.StringDeserializer. If your value is some other object then you create your custom serializer class. Continue in the same project. Let's get to it! Kafka Key Concepts with Producer Consumer. two consumers cannot consume messages from the same partition at the same time. In this post you will see how you can write standalone program that can produce messages and publish them to Kafka broker. A Kafka client that publishes records to the Kafka cluster. This helps in replicated commit log service and provides resilience. Now, we will be creating a topic having multiple partitions in it and then observe the behaviour of consumer and producer.As we have only one broker, we have a replication factor of 1 but we have have a partition of 3. For example, the sales process is producing messages into a sales topic whereas the account process is producing messages on the account topic. How to install Apache Kafka. In our example, our value is String, so we can use the StringSerializer class to serialize the key. But if there are 4 consumers but only 3 partitions are available then any one of the 4 consumer won't be able to receive any message. In next article, I will be discussing how to set up monitoring tools for Kafka using Burrow. If you haven’t already, check out my previous tutorial on how to setup Kafka in docker. This configuration comes handy if no offset is committed for that group, i.e. A consumer is also instantiated by providing properties object as configuration.Similar to the StringSerialization in producer, we have StringDeserializer in consumer to convert bytes back to Object.group.id is a must have property and here it is an arbitrary value.This value becomes important for kafka broker when we have a consumer group of a broker.With this group id, kafka broker ensures that the same message is not consumed more then once by a consumer group meaning a message can be only consumed by any one member a consumer group. Note that this consumer is designed as an infinite loop. Above command will create a topic named devglan-test with single partition and hence with a replication-factor of 1. The logger is implemented to write log messages during the program execution. The write operation starts with the partition 0 and the same data is replicated in other remaining partitions of a topic. Import the project to your IDE. 1. Apache Kafka - Example of Producer/Consumer in Java If you are searching for how you can write simple Kafka producer and consumer in Java, I think you reached to the right blog. The above snippet creates a Kafka consumer with some properties. Spring Jms Activemq Integration Example. Install Maven. In the last section, we learned the basic steps to create a Kafka Project. Record: Producer sends messages to Kafka in the form of records. Review these code example to better understand how you can develop your own clients using the Java … In this post will see how to produce and consumer User pojo object. A record is a key-value pair. Share this article on social media or with your teammates. Apache Kafka is publish-subscribe messaging rethought as a distributed commit log. This is the producer log which is started after consumer. Join our subscribers list to get the latest updates and articles delivered directly in your inbox. All examples include a producer and consumer that can connect to any Kafka cluster running on-premises or in Confluent Cloud. Navigate to the root of Kafka directory and … We create a Message Consumer which is able to listen to messages send to a Kafka topic. The above snippet creates a Kafka producer with some properties. Join the DZone community and get the full member experience. KEY_DESERIALIZER_CLASS_CONFIG: The class name to deserialize the key object. You can create your custom partitioner by implementing the CustomPartitioner interface. Each Broker contains one or more different Kafka topics. ProducerConfig.RETRIES_CONFIG=0. Create a new Java Project called KafkaExamples, in your favorite IDE. The example includes Java properties for setting up the client identified in the comments; the functional parts … We require kafka_2.12 artifact as a maven dependency in a java project. Control Panel\All Control Panel Items\System, "org.apache.kafka.common.serialization.StringSerializer", "org.apache.kafka.common.serialization.StringDeserializer". Configure Producer and Consumer properties. Records sequence is maintained at the partition level. In this tutorial, we are going to create simple Java example that creates a Kafka producer. spring.kafka.consumer.group-id: A group id value for the Kafka consumer. The application consists primarily of four files: 1. pom.xml: This file defines the proje… Now that we know the common terms used in Kafka and the basic commands to see information about a topic ,let's start with a working example. key.deserializer=org.apache.kafka… Kafka topics provide segregation between the messages produced by different producers. For example: localhost:9091,localhost:9092. Since, we have not made any changes in the default configuration, Kafka should be up and running on http://localhost:9092, Let us create a topic with a name devglan-test. Following is a sample output of running Consumer.java. programming tutorials and courses. How to configure spring and apache Kafka. AUTO_OFFSET_RESET_CONFIG: For each consumer group, the last committed offset value is stored. For example: PARTITIONER_CLASS_CONFIG: The class that will be used to determine the partition in which the record will go. In these cases, native Kafka client development is the generally accepted option. Execute this command to see the list of all topics. GROUP_ID_CONFIG: The consumer group id used to identify to which group this consumer belongs. You can create your custom deserializer. Extract it and in my case I have extracted kafka and zookeeper in following directory: 2. In my case it is - C:\D\softwares\kafka_2.12-1.0.1, 2. The example application is located at https://github.com/Azure-Samples/hdinsight-kafka-java-get-started, in the Producer-Consumer subdirectory. In this post we will see Spring Boot Kafka Producer and Consumer Example from scratch. We are going to cover below points. It has kafka-clients,zookeeper, zookepper client,scala included in it. We used the replicated Kafka topic from producer lab. The above snippet explains how to produce and consume messages from a Kafka broker. spring.kafka.consumer.enable-auto-commit: Setting this value to false we can commit the offset messages manually, which avoids crashing of the consumer if new messages are consumed when the currently consumed message is being processed by the consumer. VALUE_SERIALIZER_CLASS_CONFIG: The class that will be used to serialize the value object. If you want to run a consumeer, then call the runConsumer function from the main function. Rename file C:\D\softwares\kafka-new\zookeeper-3.4.10\zookeeper-3.4.10\conf\zoo_sample.cfg to zoo.cfg, 5. In this article, we will see how to produce and consume records/messages with Kafka brokers. Producer: Creates a record and publishes it to the broker. Kafka cluster has multiple brokers in it and each broker could be a separate machine in itself to provide multiple data backup and distribute the load. For Hello World examples of Kafka clients in various programming languages including Java, see Code Examples. Kafka cluster is a collection of no. In this article, we discussed about setting up kafka in windows local machine and creating Kafka consumer and producer on Java using a maven project.You can share your feedback in the comment section below. Producer can produce messages and consumer can consume messages in the following way from the terminal. ... Kafka Producer in Java API an example bigdata simplified. After this, we will be creating another topic with multiple partitions and equivalent number of consumers in a consumer-group to balance the consuming between the partitions. By default, there is a single partition of a topic if unspecified. In my last article, we discussed how to setup Kafka using Zookeeper. They also include examples of how to produce and consume Avro data … Kafka Producer. New Consumer connects before Producer publishes. demo, here, is the topic name. Lombok is used to generate setter/getter methods. But the process should remain same for most of the other IDEs. BOOTSTRAP_SERVERS_CONFIG: The Kafka broker's address. The Spring Boot app starts and the consumers are registered in Kafka… Setting this value to earliest will cause the consumer to fetch records from the beginning of offset i.e from zero. Now open a new terminal at C:\D\softwares\kafka_2.12-1.0.1. If there are 3 consumers in a consumer group, then in an ideal case there would be 3 partitions in a topic. To stream pojo objects one need to create custom serializer and deserializer. If in your use case you are using some other object as the key then you can create your custom serializer class by implementing the Serializer interface of Kafka and overriding the serialize method. The partitions argument defines how many partitions are in a topic. Below snapshot shows the Logger implementation: Apache Kafka Consumer Example. By new records mean those created after the consumer group became active. Each topic partition is an ordered log of immutable messages. Just copy one line at a time from person.json file and paste it on the console where Kafka … The producer is thread safe and sharing a single producer instance across threads will generally be faster than having multiple instances.. Execute this command to see the information about a topic. Now, the consumer can start consuming data from any one of the partitions from any desired offset. I have downloaded zookeeper version 3.4.10 as in the kafka lib directory, the existing version of zookeeper is 3.4.10.Once downloaded, follow following steps: 1. We will be configuring apache kafka and zookeeper in our local machine and create a test topic with multiple partitions in a kafka broker.We will have a separate consumer and producer defined in java that will produce message to the topic and also consume message from it.We will also take a look into how to produce messages to multiple partitions of a single topic and how those messages are consumed by consumer group. If Kafka is running in a cluster then you can provide comma (,) seperated addresses. If you are facing any issues with Kafka, please ask in the comments. So producer java … All examples include a producer and consumer that can connect to any Kafka cluster running on-premises or in Confluent Cloud. Go to the Kafka home directory. Simple Consumer Example. VALUE_DESERIALIZER_CLASS_CONFIG: The class name to deserialize the value object. We will see this implementation below: If there are 2 consumers for a topic having 3 partitions, then rebalancing is done by Kafka out of the box. Instead, clients connect to c-brokers which actually distributes the connection to the clients. The Kafka consumer uses the poll … For example, Broker 1 might contain 2 different topics as Topic 1 and Topic 2. Monitoring Spring Boot App with Spring Boot Admin We will be creating a kafka producer and consumer in Nodejs. It contains the topic name and partition number to be sent. Thus, the most natural way is to use Scala (or Java) to call Kafka APIs, for example, Consumer APIs and Producer APIs. We have used String as the value so we will be using StringDeserializer as the deserializer class. Hence, as we will allow kafka broker to decide this, we don't require to make any changes in our java producer code. KafkaConsumer API is used to consume messages from the Kafka cluster. For Hello World examples of Kafka clients in Java, see Java. Here is a simple example of using the producer to send records with strings containing sequential numbers as the key/value pairs. ./bin/kafka-topics.sh --describe --topic demo --zookeeper localhost:2181 . comments You can see in the console that each consumer is assigned a particular partition and each consumer is reading messages of that particular partition only. Think of it like this: partition is like an array; offsets are like indexs. I already created a topic called cat that I will be using. Also, we will be having multiple java implementations of the different consumers. As of now we have created a producer to send messages to Kafka cluster. Now, start all the 3 consumers one by one and then the producer. replication-factor: if Kafka is running in a cluster, this determines on how many brokers a partition will be replicated. Using the synchronous way, the thread will be blocked until an offset has not been written to the broker. KafkaConsumer class constructor is defined below. But since we have, 3 partitions let us create a consumer group having 3 consumers each having the same group id and consume the message from the above topic. As we saw above, each topic has multiple partitions. Kafka Producer and Consumer Examples Using Java In this article, a software engineer will show us how to produce and consume records/messages with Kafka brokers. Unzip the downloaded binary. The offset of records can be committed to the broker in both asynchronous and synchronous ways. Kafka producer consumer command line message send/receive sample July 16, 2020 Articles Kafka is a distributed streaming platform, used effectively by big enterprises for mainly streaming the large amount of data between different microservices / different systems. For most cases however, running Kafka producers and consumers using shell scripts and Kafka’s command line scripts cannot be used in practice. This version has scala and zookepper already included in it.Follow below steps to set up kafka. A topic can have many partitions but must have at least one. Over a million developers have joined DZone. You created a Kafka Consumer that uses the topic to receive messages. A consumer group is a group of consumers and each consumer is mapped to a partition or partitions and the consumer can only consume messages from the assigned partition. Go to folder C:\D\softwares\kafka_2.12-1.0.1\config and edit server.properties. All examples include a producer and consumer that can connect to any Kafka cluster running on-premises or in Confluent Cloud. ./bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic demo . … Let’s utilize the pre-configured Spring Initializr which is available here to create kafka-producer-consumer-basics starter project. In the demo topic, there is only one partition, so I have commented this property. Topic: Producer writes a record on a topic and the consumer listens to it. Next start the Spring Boot Application by running it as a Java Application. In our project, there will be two dependencies required: Kafka Dependencies; Logging Dependencies, i.e., SLF4J … We have seen how Kafka producers and consumers work. Kafka broker keeps records inside topic partitions. Also Start the consumer listening to the java_in_use_topic- C:\kafka_2.12-0.10.2.1>.\bin\windows\kafka-console-consumer.bat --bootstrap-server localhost:9092 --topic java_in_use_topic --from-beginning Also, edit the PATH variable and add new entry as %ZOOKEEPER_HOME%\bin\ for zookeeper. Commands: In Kafka, a setup directory inside the bin folder is a script (kafka-topics.sh), using which, we can create and delete topics and check the list of topics. If Kafka is running in a cluster then you can provide comma (,) seperated addresses. If you're using Enterprise Security Package (ESP) enabled Kafka cluster, you should use the application version located in the DomainJoined-Producer-Consumersubdirectory. We create a Message Producer which is able to send messages to a Kafka topic. A simple working example of a producer program. In our example, our key is Long, so we can use the LongSerializer class to serialize the key. package com.opencodez.kafka; import java.util.Arrays; import … Step-1: Create a properties file: kconsumer.properties with below contents. How to start zookeeper/kafka and create a topic. Start Zookeeper and Kafka Cluster. Click on Generate Project. If you want to run a producer then call the runProducer function from the main function. Execute .\bin\windows\kafka-server-start.bat .\config\server.properties to start Kafka. Ideally we will make duplicate Consumer.java with name Consumer1.java and Conumer2.java and run each of them individually. Technical Skills: Java/J2EE, Spring, Hibernate, Reactive Programming, Microservices, Hystrix, Rest APIs, Java 8, Kafka, Kibana, Elasticsearch, etc. The Consumer. Here is a simple example of using the producer to send records with strings containing sequential numbers as the key/value pairs. It will send messages to the topic devglan-test. Kafka Producer and Consumer Examples Using Java, Developer Producer … Now let us create a producer and consumer for this topic. Devglan is one stop platform for all In the first half of this JavaWorld introduction to Apache Kafka, you developed a couple of small-scale producer/consumer applications using Kafka. Now, in the command prompt, enter the command zkserver and the zookeeper is up and running on http://localhost:2181. You create a new replicated Kafka topic called my-example-topic, then you create a Kafka producer that uses this topic to send records.You will send records with the Kafka producer. We can do it in 2 ways. Now, it's time to produce message in the topic devglan-partitions-topic. Assuming Java and Maven are both in the path, and everything is configured fine for JAVA_HOME, use the following commands to build the consumer and producer example: cd Producer-Consumer mvn clean package. Video includes: How to develop java code to connect Kafka server. Read Now! Consumer: Consumes records from the broker. First of all, let us get started with installing and configuring Apache Kafka on local system and create a simple topic with 1 partition and write java program for producer and consumer.The project will be a maven based project. You created a simple example that creates a Kafka consumer to consume messages from the Kafka Producer you created in the last tutorial. After a topic is created you can increase the partition count but it cannot be decreased. Let us assume we have 3 partitions of a topic and each partition starts with an index 0. Before starting with an example, let's get familiar first with the common terms and some commands used in Kafka. Either producer can specify the partition in which it wants to send the message or let kafka broker to decide in which partition to put the messages. In this tutorial, we will be developing a sample apache kafka java application using maven. A Kafka client that publishes records to the Kafka cluster. Now, let us see how these messages of each partition are consumed by the consumer group. Kafka allows us to create our own serializer and deserializer so that we can produce and consume different data types like Json, POJO e.t.c. Basic set-up of of Kafka cluster and producer consumer examples in Java. In normal operation of Kafka, all the producers could be idle while consumers are likely to be still running. We will be configuring apache kafka and zookeeper in our local machine and create a test topic with multiple partitions in a kafka broker.We will have a separate consumer and producer defined in java that will produce … Once this is extracted, let us add zookeeper in the environment variables.For this go to Control Panel\All Control Panel Items\System and click on the Advanced System Settings and then Environment Variables and then edit the system variables as below: 3. For example: MAX_POLL_RECORDS_CONFIG: The max count of records that the consumer will fetch in one iteration. BOOTSTRAP_SERVERS_CONFIG: The Kafka broker's address. Now each topic of a single broker will have partitions. Head over to http://kafka.apache.org/downloads.html and download Scala 2.12. The above snippet contains some constants that we will be using further. Marketing Blog. The producer is thread safe and sharing a single producer instance across threads will generally be faster than having multiple instances.. Kafka Consumer Example Using Java. 3. powered by Disqus. ... Now, before creating a Kafka producer in java, we need to define the essential Project dependencies. of brokers and clients do not connect directly to brokers. The user needs to create a Logger object which will require to import 'org.slf4j class'. You can define the logic on which basis partition will be determined. In our project, there will be three dependencies required: Open URL start.spring.io and Create Maven Project with these three dependencies. Creating Kafka Producer in Java. Opinions expressed by DZone contributors are their own. For example:localhost:9091,localhost:9092. ENABLE_AUTO_COMMIT_CONFIG: When the consumer from a group receives a message it must commit the offset of that record. localhost:2181 is the Zookeeper address that we defined in the server.properties file in the previous article. Producers are the data source that produces or streams data to the Kafka cluster whereas the consumers consume those data from the Kafka cluster. Offset defines the location from where any consumer is reading a message from a partition. A technology savvy professional with an exceptional capacity to analyze, solve problems and multi-task. We have used Long as the key so we will be using LongDeserializer as the deserializer class. This command will have no effect if in the Kafka server.properties file, if delete.topic.enable is not set to be true. Read JSON from Kafka using consumer shell; 1. CLIENT_ID_CONFIG: Id of the producer so that the broker can determine the source of the request. Partition starts with the common terms and some commands used in Kafka -- topic demo exceptional to! Any desired offset a partition has an offset has not been written to the broker one stop platform for programming. Should remain same for most of the partitions argument defines how many partitions in! To brokers spring.kafka.consumer.group-id: a group receives a message consumer which is able to listen messages. Steps to set up Kafka Kafka clients in various programming languages including java we... ; the functional parts … Install maven navigate to the clients can not kafka java producer consumer example decreased listens to it of! Connect to any Kafka cluster is one stop platform for all programming tutorials and courses numbers as the deserializer provided!: When the consumer first which will keep polling Kafka topic ; then the... How these messages of each partition are consumed by the consumer to send/receive String messages – Hello word example messages! The offset of records that the consumer can start consuming data from any desired offset java! Offset defines the proje… new consumer connects before producer publishes now we have used as. Record: producer sends messages to a Kafka Project and sharing a single broker Kafka cluster will. Object then you can create your custom serializer class a single partition a! Offset associated with it step by step process to write a simple example of using the producer directory 2!, zookeeper, zookepper client, scala included in it used String as the value object to..., producer will send 10 records & then close producer the User needs create! Became active starting with an example, the last committed offset value is some other then. Zookeeper on Windows.Download zookeeper from https: //zookeeper.apache.org/releases.html key/value pairs located at https //zookeeper.apache.org/releases.html! Ideal case there would be 3 partitions of a topic partition is an ordered log immutable! Spring Boot Admin read now safe and sharing a single partition and hence with a replication-factor of.! The max count of records can be committed to the clients, kafka java producer consumer example systems, systems! Our value is String, so I have commented this property has and. Post you will see how these messages of each partition starts with an exceptional capacity to analyze, problems! Run the producer to send messages to Kafka cluster the consumer listens to it String, so we use! Record on a topic named devglan-test with single partition and hence with a replication-factor of.! Technology savvy professional with an exceptional capacity to analyze, solve problems and multi-task one... 'Re using Enterprise Security Package ( ESP ) enabled Kafka cluster consumers in a consumer can consume multiple. Java API an example, broker 1 might contain 2 different topics topic. Write log messages during the program execution also, edit the PATH variable and add new as... Producer instance across threads will generally be faster than having multiple instances Producer-Consumer subdirectory producer and examples! Must commit the offset of records this version has scala and zookepper kafka java producer consumer example included in it it like:... This: partition is an ordered log of immutable messages needs to create simple java example that creates a on! Systems, self-healing systems, self-healing systems, self-healing systems, and service-oriented architecture used! Client, scala included in it Enterprise Security Package ( ESP ) enabled Kafka.... Clients in various programming languages including java, we are going to create simple java example that creates record..., i.e, self-healing systems, and service-oriented architecture the application version located the. The PATH variable and add new entry as % ZOOKEEPER_HOME % \bin\ for zookeeper deserializer class is the accepted...: PARTITIONER_CLASS_CONFIG: the class that will be developing a sample apache is. Of them individually is able to listen to messages send to a producer! ) enabled Kafka cluster is publish-subscribe messaging rethought as a maven dependency in a java application using.... This value to earliest will cause the consumer group became active 10 records then. Ideally we will be a single broker Kafka cluster how to configure a Spring Kafka consumer and example... Windows.Download zookeeper from https: //github.com/Azure-Samples/hdinsight-kafka-java-get-started, in the last committed offset value is some other object then can... Spring Initializr which is available here to create kafka-producer-consumer-basics starter Project do not connect directly to brokers records mean created... All examples include a producer to send records with strings containing sequential numbers as the deserializer interface provided by.! Actually distributes the connection to the Kafka server.properties file in the following from..., zookepper client, scala included in it.Follow below steps to create kafka-producer-consumer-basics starter Project function from the main.! Scalable distributed systems, and service-oriented architecture be decreased serializer class media or with your.... That this consumer belongs included in it can create your custom deserializer by implementing the deserializer interface by! Us see how you can create your custom serializer class that the consumer can start data. Index 0 comes handy if no offset is committed for that group then... That record of using the synchronous way, the last tutorial and then the producer in apache Kafka running. The request group became active using maven use the LongSerializer class to serialize the key.... Having multiple instances -- zookeeper localhost:2181 -- delete -- topic demo -- localhost:2181... Brokers a partition partition: a topic and the consumer group to decide which partition will used! Join our subscribers list to get the latest updates and articles delivered in. Spring Boot App with Spring Boot application by running it as a distributed commit log service and provides resilience run! Hello World examples of Kafka cluster running on-premises or in Confluent Cloud message in the previous article message it commit. Haven ’ t already, check out the whole Project on my GitHub..: 1. pom.xml: this file defines the location from where any consumer is a... Producers are the data source that produces or streams data to the root of Kafka in! Using Enterprise Security Package ( ESP ) enabled Kafka cluster whereas the account is... Be faster than having multiple instances my previous tutorial on how to set up tools... Can be committed to the clients producer instance across threads will generally be faster than multiple... Connect Kafka server used Long as the value so we will be used to determine the partition and. Is producing messages on the account topic to Kafka cluster, this determines how. Location from where any consumer is designed as an infinite loop single partition of a topic if unspecified will... To any Kafka cluster consumer which is started after consumer many brokers a partition has an offset has been. '', `` org.apache.kafka.common.serialization.StringSerializer '', `` org.apache.kafka.common.serialization.StringDeserializer '' replicated in other partitions... Determine the source of the producer so that the broker in both and. The partition 0 and the same time App with Spring Boot application running! Name to deserialize the value object above command will have partitions this determines on how to setup Kafka zookeeper... The source of the other IDEs with a replication-factor of 1 platform all! With Spring Boot kafka java producer consumer example read now single producer instance across threads will be... Records/Messages with Kafka brokers this helps in replicated commit log technical expertise in highly scalable distributed systems and... Partition and hence with a replication-factor of 1 producer instance across threads will generally be faster than multiple!, solve problems and multi-task defined in the comments ; the functional parts … Install maven create kafka-producer-consumer-basics starter.... Check out my previous tutorial on how many partitions are in a then... The server.properties file in the following way from the main function URL start.spring.io and create maven Project with three. And download scala 2.12 a new java Project as of now we seen! And zookepper already included in it is - C: \D\softwares\kafka_2.12-1.0.1, 2 partitioner by implementing the CustomPartitioner.. Single broker Kafka cluster consumer to fetch records from the beginning of offset i.e from zero Package ESP! Topic to receive messages 1. pom.xml: this file defines the location from any... This value to earliest will cause the consumer group, then call the runConsumer from. Cluster and producer example producers and consumers work like indexs be blocked until an offset not! Consumer example in apache Kafka java application using maven to the broker can determine the partition count but it not... And articles delivered directly in your favorite IDE topic can have many partitions but must have at least one standalone! Effect if in the DomainJoined-Producer-Consumersubdirectory deserializer by implementing the CustomPartitioner interface Kafka clients various... Produces or streams data to the broker been written to the clients examples. Is created you can define the essential Project dependencies message producer which is after... When the consumer to consume messages from the main function programming languages including java, we will having. Directly to brokers Logger object which will require to import 'org.slf4j class ' creates a Kafka producer and consumer using! Offset associated with it one and then the producer is thread safe and sharing a single partition and with... By implementing the CustomPartitioner interface produced by different producers be creating a Kafka Project address. The producer to send records with strings containing sequential numbers as the deserializer class Spring consumer... No offset is committed for that group, then call the runProducer function from the partition. Be having multiple instances different producers are likely to be true topic name partition! A producer and consumer for this topic artifact as a maven dependency in a cluster, should... Partition are consumed by the consumer will fetch in one iteration an index 0 to earliest will the... The consumers consume those data from any one of the request the latest updates and articles delivered in.
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