js with new unified consumer API support. Kafka Testing at its Most Simple. Hence, prior to starting Kafka, Zookeeper has to be started. Check the Apache Kafka compatibility matrix for the support of the target system with respect to the dependency. There are two projects included in this repository: Producer-Consumer: This contains a producer and consumer that use a Kafka topic named test. In this tutorial, you will install and use Apache Kafka 1. Spark Streaming + Kafka Integration Guide (Kafka broker version 0. But this time, I am not going to access the service with personal account, I do not want user experience the authentication window, and the personal profile doesn't matter. Before starting Kafka containers we have to start ZooKeeper server, which is used by Kafka. Start Apache Zookeper (Open a new command)D:\j2ee-workspace-neon\kafka_2. Connector can be found in 'optional/ignite-kafka. xml and add the following dependencies to your project: As a first step, we have to add the Flink Kafka connector as a dependency so that we can use the Kafka sink. The Kafka Consumers in Flink commit the offsets back to Zookeeper (Kafka 0. Conclusion. If you want to have multiple ZooKeeper instances for your cluster, the value of the zookeeper. Please note that the KAFKA_TOPIC and KAFKA_ZOOKEEPER_HOSTS are to be supplied as the VM arguments. sh --create--zookeeper localhost:2181 --replication-factor 1 --partitions 3 --topic test_topic List topics bin/kafka-topics. I've already written about integration testing, consumer testing, and producer testing. Currently, Kafka uses ZooKeeper to store its metadata about partitions and brokers, and to elect a broker to be the Kafka Controller. There are a few motivating factors why I’ve chosen to evolve an existing system instead of building one the way I want from scratch. connect property on each node should be an identical, comma-separated string listing the IP addresses and port numbers of all the ZooKeeper instances. Kafka has dependency on Java Runtime and Zookeeper. The Alpakka project is an open source initiative to implement stream-aware and reactive integration pipelines for Java and Scala. The Samza Runner executes Beam pipeline in a Samza application and can run locally. Kafka uses ZooKeeper, which is packaged with the Kafka package you can download. Just to remind you that to install Apache Kafka, we need the Zookeeper. From the offset in Zookeeper, users can still use tools such as Kafka’s Offset Checker. Apache Kafka depends on Zookeeper for cluster management. Apache Curator is a Java/JVM client library for Apache ZooKeeper, a distributed coordination service. this may be correct behaviour since the sbt documentation states that you may specify a direct URL to the *jar file* via the from directive. In this blog post, we will learn how to build a real-time analytics dashboard using Apache Spark streaming, Kafka, Node. I have started following the apache kafka documentation, but later thought to find the homebrew installer of Kafka. In this tutorial, we will be developing a sample apache kafka java application using maven. properties Start Apache Kafka-. Confluent Schema Registry stores Avro Schemas for Kafka producers and consumers. Then install Confluent platform, by unzipping the downloaded file at a known location. Solr is highly reliable, scalable and fault tolerant, providing distributed indexing, replication and load-balanced querying, automated failover and recovery, centralized configuration and more. 8 support is deprecated as of Spark 2. Hence, before I install Kafka, I will have to install JRE8 and Zookeeper. Update the temporary table with data required, upto a specific date using epoch. Zookeeper and Kafka are separate installations, but for this course, we will be installing them in two ways. Start Zookeeper. Kafka is a popular high performant and horizontally scalable messaging platform originally developed by LinkedIn. It provides access to one or more Kafka topics. Flink's Kafka consumer is called FlinkKafkaConsumer08 (or 09 for Kafka 0. 0 is production-ready software. The problem is when do we have to remove or replace a cache entry? The. Learn more about Solr. sh --zookeeper localhost:2181 --delete --topic remove-me Topic remove-me is marked for deletion. Kafka’s replication design uses leaders, elected via Zookeeper. 1 The below code is useful for creating the Kafka topic via Java code. Zookeeper serves as the coordination interface between the Kafka brokers and consumers. Currently Kafka has two different types of consumers. In a short time, Apache Storm became a standard for distributed real-time processing system that allows you to process a huge volume of data. docker stop dockerfiles_dmaap_1 docker stop dockerfiles_kafka_1 docker stop dockerfiles_zookeeper_1 docker start dockerfiles_zookeeper_1 sleep 10 docker start. 7zip Installation. 在你安装的 Kafka 目录文件下： 启动 ZK. Final’ is (only) a direct dependency of ‘zookeeper:3. So, you have to change the retention time to 1 second, after which the messages from the topic will be deleted. 使用安装包中的脚本启动单节点 Zookeeper 实例：. Navigate to the unzipped directory, and run the command. The Hazelcast® Zookeeper Discovery plugin provides a service based discovery strategy by using Apache Curator for communicating your Zookeeper server for Hazelcast 3. Supports sync and async Gzip and Snappy compression, producer batching and controllable retries, offers few predefined group assignment strategies and producer partitioner option. 9 are only supported by the new consumer. Zookeeper: ZooKeeper is a centralized service for maintaining and providing distributed synchronization, and providing group services. appending to the relevant file. 1, I still see that the message is not sent to Kafka. Mmm that sounds like a fair bit. After updating my bom materials dependencies to 1. Apache Kafka is a Publish & Subscribe data streaming system. properties is the one you created in the previous procedure. Please note that the KAFKA_TOPIC and KAFKA_ZOOKEEPER_HOSTS are to be supplied as the VM arguments. Originally developed by LinkedIn in 2011 the project has been donated to Apache, many companies have successfully adopted the technology. the from directive did not work for me. In this article I will tackle an operational need: adding and removing nodes in a Kafka 0. Hola Juan, pudiste solucionar el incidente? tengo el servicio en rojo, con el siguiente mensaje: "Apache Kafka is not Available". If the process instance and task instance priority are not set. Here you can download the dependencies for the java class kafka. In this tutorial series, we will be discussing how to stream log4j application logs to Apache Kafka using maven artifact kafka-log4j-appender. You created a Kafka Consumer that uses the topic to receive messages. ZooKeeper is a high-performance coordination service for distributed applications and Kafka uses ZooKeeper to store the metadata information of the cluster. We can use the Zookeeper bundled with Kafka or use a separated Zookeeper which can be installed on another node. 9 or later) to start the Debezium services, run a MySQL database server with a simple example database, use Debezium to monitor the database, and see the resulting event streams respond as the data in the database changes. GitHub is home to over 36 million developers working together to host and review code, manage projects, and build software together. We are done with all the necessary configuration, Let's start the zookeeper and kafka server as mentioned below. Move old table to a different table name. We also need to add the spring-kafka dependency to our pom. They are very essential when we work with Apache Kafka. xml, open pom. Future Kafka releases are planning to remove the zookeeper dependency but as of now it is an integral part of it. Zookeeper serves as the coordination interface between the Kafka brokers and consumers. this may be correct behaviour since the sbt documentation states that you may specify a direct URL to the *jar file* via the from directive. This forced a dependency on ZooKeeper for clients but also posed a major bottleneck since ZooKeeper is relatively low throughput. Spark Streaming + Kafka Integration Guide (Kafka broker version 0. In this blog post, we will learn how to build a real-time analytics dashboard using Apache Spark streaming, Kafka, Node. Also Grafana and InfluxDB could be deployed separately. In this tutorial, we will be developing a sample apache kafka java application using maven. Zookeeper will mark the broker as dead due to lack of heartbeats and a new Kafka node will be elected Controller. I am new to Zookeeper and I am trying to understand it using book - Zookeeper by By Flavio Junqueira, Benjamin Reed As per this book the command to start. It consumes a batch of IMDG operations, converts them to custom Kafka messages and sends these to the Kafka server using the Kafka Producer API. In the above blogpost I’ve set the configuration file destination as a file, so all Kafka messages that are consumed will be saved in a text file. \bin\windows\zookeeper-server-start. It allows distributed processes to coordinate with each other through a shared hierarchal namespace which is organized similarly to a standard file. We will have a separate consumer and producer defined in java that will produce message to the topic and also consume message from it. Our current solution is to map etcd code back to Zookeeper’s. 0 on Ubuntu 18. Spring Kafka brings the simple and typical Spring template programming model with a KafkaTemplate and Message-driven POJOs via @KafkaListener annotation. (Step-by-step) So if you're a Spring Kafka beginner, you'll love this guide. Step 3 — Install ZooKeeper. Download the file for your platform. Download files. Couple of notes: We are assuming that each producer (for example Varnishkafka) will have a specific certificate deployed to all the hosts that needs to use it (using unix perms to allow only selected daemons to read/use it). As a result 7zip also needs to be installed to extract these files. Installing from the Binary Distribution¶. Introduction This blog will show you how to deploy Apache Kafka cluster on Kubernetes. apache-kafka,kafka So to summarize, the solution to this was to add a route via NAT so that the machine can access its own external IP address. At Chaos Conf, a few weeks ago, we helped dozens of folks plan GameDays around the critical dependencies of their apps. And of course we got a dependency on the Kafka broker in our code - definitely not great. Set Up Kafka , Set Up AppFormix with Kafka, Messages from AppFormix to Kafka, AppFormix Alarms With Kafka. Apache Kafka is an open-source stream-processing software platform developed by LinkedIn and donated to the Apache Software Foundation, written in Scala and Java. We will have a separate consumer and producer defined in java that will produce message to the topic and also consume message from it. The Schema Registry and provides RESTful interface for managing Avro schemas It allows the storage of a history of schemas which are versioned. Setup UI tools such as Kafka Manager, Zoo Navigator, and Kafka Monitor to get a full view of your cluster; Understand basic operations you can perform with these tools; Monitoring for Apache Kafka. Basic Spring Boot and Kafka application The easiest way to get a skeleton for our app is to navigate to start. Conclusion. Installation and Setup. \config\zookeeper. 8，jdk-8u101-linux-x64 一 kafka以及zookeeper安装以及环境配置 二 zookeeper集群配置以及测试 三 kafka集群配置以及测试. Either way, we still need ZooKeeper to run Kafka brokers. I hope this post will bring you a list for easy copying and pasting. Try it out Create a Kubernetes cluster. Originally developed by LinkedIn in 2011 the project has been donated to Apache, many companies have successfully adopted the technology. Apache Kafka is a popular distributed message broker designed to efficiently handle large volumes of real-time data. My first blog post discussed learning about Kafka through experimentation and the scientific method. I have started following the apache kafka documentation, but later thought to find the homebrew installer of Kafka. 1 or later), consider doing so. A critical dependency of Apache Kafka is Apache Zookeeper, which is a distributed configuration and synchronization service. xml and add the following dependencies to your project: As a first step, we have to add the Flink Kafka connector as a dependency so that we can use the Kafka sink. All methods will return a promise. And of course we got a dependency on the Kafka broker in our code – definitely not great. From the root of Apache Kafka, run the following command to start Zookeeper :. We'll explore what it takes to install, configure, and actually use each tool in a meaningful way. My spark is running on Yarn. Kafka Brokers, Producers and Consumers emit metrics via Yammer/JMX but do not maintain any history, which pragmatically means using a 3rd party monitoring system. Better Security: the security extensions implemented in Kafka 0. Net --version 3. Here Coding compiler sharing a list of 30 Kafka interview questions for experienced. Graceful shutdown. xml and add the following dependencies to your project: As a first step, we have to add the Flink Kafka connector as a dependency so that we can use the Kafka sink. The XAP Kafka integration is done via the SpaceSynchronizationEndpoint interface deployed as a Mirror service PU. In turn, it notifies the DynamicKafkaConsumer to add/remove topic-partitions. g) Similarly how do I find out the version of zookeeper? First of all it doesn't have a binary called zookeeper. Finally the eating of the pudding: programmatic production and consumption of messages to and from the cluster. 0 pre-dated the Spring for Apache Kafka project and therefore were not based on it. Apache Zookeeper, Kafka and Solr location. 0 on Ubuntu 18. If you want the connector to remove this node before persisting the document to Couchbase, provide a couchbase. dotnet add package ZooKeeper. Monitor Apache ZooKeeper cluster health and performance. Getting Started with Sample Programs for Apache Kafka 0. Actually, once we install Kafka, we can use the ZooKeeper that comes with Kafka. enable=true. 10，zookeeper版本为：zookeeper-3. , and the Kafka playbook takes care of this dependency. # The example below removes the Kafka package (for Scala 2. Kafka Python client. Apache ZooKeeper is an effort to develop and maintain an open-source server which enables highly reliable distributed coordination. In fact, we send billions of messages a day through our various. The only Python “outsider” we will use in this exercise is Apache-Kafka (we will use the python API Kafka-Python but still, Kafka needs to be installed in your system). Version Scala Repository Usages Date; 2. In the above blogpost I’ve set the configuration file destination as a file, so all Kafka messages that are consumed will be saved in a text file. For example, an application can connect to ZooKeeper, save the session id and password to a file, terminate, restart, read the session id and password,. Como lo deshabilito o se instala el deploy?. Just to remind you that to install Apache Kafka, we need the Zookeeper. Both Zookeeper and Kafka containers will be started in the same network kafka. As you can imagine, this is a complex feature and hence it will take a fairly long time for us to fully leverage this in production. debug=true to the KAFKA_HEAP_OPTS. 2 Installing Kafka and Zookeeper is pretty easy. 注: 若前端需要自编译，并且 node_modules 依赖包下载失败，可参考链接中issue 配置环境变量. tgz file, and deployed to a YARN cluster or Samza standalone cluster with Zookeeper. Download Kafka from here and untar it: > tar -xzf kafka_2. Confluent Schema Registry stores Avro Schemas for Kafka producers and consumers. Conclusion. We will be configuring apache kafka and zookeeper in our local machine and create a test topic with multiple partitions in a kafka broker. (Step-by-step) So if you're a Spring Kafka beginner, you'll love this guide. All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. 8，jdk-8u101-linux-x64 一 kafka以及zookeeper安装以及环境配置 二 zookeeper集群配置以及测试 三 kafka集群配置以及测试. Zookeeper uses the address it finds in advertised. We start a Zookeeper (a Kafka dependency) and Kafka with the JMX exporter running as a Java agent:. bytes KAFKA-1981 Make log compaction point configurable. Kafka does rely upon a small cluster of Zookeeper nodes to manage responsibilities of each broker. Hence, prior to starting Kafka, Zookeeper has to be started. But what about jmxtrans? Should it live together with Kafka on the same box ending up with one jmxtrans process per Kafka node? Or should it rather be deployed with InfluxDB?. py to see a way of installing Kafka for development. Getting started with Kafka and Zookeeper Setup java environment and then add Apache Zookeeper and Apache Kafka. A framework for cluster communication. We hope that the community will become engaged and help us to refactor this part of Kafka as well. Confluent is a company founded by the team that built Apache Kafka. Flink's Kafka consumer participates in Flink's checkpointing mechanism as a stateful operator whose state is Kafka offsets. ByteArrayDeserializer. We will be creating a kafka producer and consumer in Nodejs. The team quickly fixed it and is available in 1. As kafka is distributed as clustered framework, it highly depends on Zookeepr to keep its clusters in sync. jar zookeeper-3. 10 is not using zookeeper. Open the pom. It is important to note that Apache Zookeeper is a required component of deploying an Apache Kafka cluster. 9+), but is backwards-compatible with older versions (to 0. They are installed respectively in the Zookeeper, Kafka and Solr subdirectory. To deploy Kafka, a zookeeper_tag and a kafka_tag needs to be specified to identify the nodes in the zookeeper and kafka clusters respectively. the from directive did not work for me. It includes a highlevel API framework and utilities to make using Apache ZooKeeper much easier and more reliable. Kafka does not currently support reducing the number of partitions for a topic or changing the replication factor. Can you build a Kafka that doesn't depend on ZooKeeper? This was the question that led me to developing a Kafka implemented in Golang, called Jocko. In this article we'll use. Couple of notes: We are assuming that each producer (for example Varnishkafka) will have a specific certificate deployed to all the hosts that needs to use it (using unix perms to allow only selected daemons to read/use it). Take table backup - just in case. Hello Muleys. Available as of Camel 2. Zookeeper serves as the coordination interface between the Kafka brokers and consumers. Kafka requires Apache Zookeeper, a service that coordinates distributed applications. If checkpointing is disabled, offsets are committed periodically. Scaling Kafka In my previous article about Kafka, I introduced some basic concepts, and showed how to use this message broker using the Java client API. Apache Flume 1. If you need to keep messages for more than 7 days with no limitation on message size per blob, Apache Kafka should be your choice. Please note, that Zookeeper 3. In addition, Kafka requires Apache Zookeeper to run but for the purpose of this tutorial, we'll leverage the single node Zookeeper instance packaged with Kafka. Any Java application that makes use of the Kafka Streams library is considered a. Simple Spark Streaming & Kafka Example in a Zeppelin Notebook hkropp Kafka , Spark Streaming , Uncategorized , Zeppelin December 25, 2016 3 Minutes Apache Zeppelin is a web-based, multi-purpose notebook for data discovery, prototyping, reporting, and visualization. txt) or read online. 使用安装包中的脚本启动单节点 Zookeeper 实例：. Resetting Kafka. A good rule of thumb is if you need to remove the role instances and recreate, then delete everything from the kafka data dir (unless you need to use the partitions), in which case, you'll have to update that meta. 1 The below code is useful for creating the Kafka topic via Java code. What is Kafka – Get know about its definition, Apache kafka architecture & its core APIs, difference between RabbitMQ and Apache kafka, partitioning in apache kafka, Also learn about different uses of kafka cluster, its future trends and job opportunities. Currently Kafka has two different types of consumers. We will remove the dependency to Zookeeper from Kafka Streams API. Apache Flume 1. Kafka Testing at its Most Simple. 13 The kafka: component is used for communicating with Apache Kafka message broker. After running Zookeeper, Kafka should be downloaded, then a developer will be able to create broker, cluster, and topic with the aid of some instructions. Both Zookeeper and Kafka containers will be started in the same network kafka. This topic provides instructions for installing a production-ready Confluent Platform configuration in a multi-node RHEL or CentOS environment with a replicated ZooKeeper ensemble. The Samza Runner executes Beam pipeline in a Samza application and can run locally. How to use kafka in docker-compose April 15, 2017 April 15, 2017 jayendratailor We are living in a world where tech is changing so fast that its not surprising if we have issues related to compatibility and configuration while setting something up. For using the Apache Kafka binder, you just need to add it to your Spring Cloud Stream application, using the following Maven coordinates: org. Create a temporary table. As mentioned before, we have used the Adult dataset. You might sometimes want to take advantage of that and reprocess some of the messages. One of the areas of IoT application is the connected vehicles. Still more digging required … but in order to circumvent the issue I have provided an alternative implementation (kakfa free), so you only need to:. To avoid potential jar conflict, it's better to exclude netty dependency from Kafka. # The example below removes the Kafka package (for Scala 2. Kafka Streams Applications Kafka Streams is a library for developing applications for processing records from Apache Kafka topics. To remove a Kafka Broker component, first reassign the Kafka topic partition Leaders from the Kafka Broker by using the kafka-reassign-partitions. With checkpointing, the commit happens once all operators in the streaming topology have confirmed that they've created a checkpoint of their state. 3) without using Receivers. Compatibility, Deprecation, and Migration Plan. Role of ZooKeeper. But in this chapter, we'll use ZooKeeper package that's available in Ubuntu's default repositories. We have seen some popular commands that provided by Apache Kafka command line interface. 3) and zookeeper (3. so if you are java house — kafka complements you Now use ca. Finally the eating of the pudding: programmatic production and consumption of messages to and from the cluster. Service dependencies for Spark 2 on YARN and Cloudera Data Science Workbench are listed separately. Provide a couchbase. py to see a way of installing Kafka for development. Kafka comes with the Zookeeper built-in, all we need is to start the service with the default configuration. I've a simple program which writes to zookeeper and and get the data back from zookeeper. Spark Streaming + Kafka Integration Guide (Kafka broker version 0. Create a temporary table. To purge the Kafka topic, you need to change the retention time of that topic. com/public/qlqub/q15. With most Kafka setups, there are often a large number of Kafka consumers. Start Apache Zookeeper- C:\kafka_2. 0 is production-ready software. Open the pom. If you have only one Kafka server, then you can remove MACHINE2_DOMAIN_NAME from the KAFKA_ZOOKEEPER_HOSTS value. Kafka Streams Upgrade System Tests 0110 Last Release on Jan 23, 2019 19. However, that dependency is optional (ZOOKEEPER-1681). # The example below removes the Kafka package (for Scala 2. We can add the below dependencies to get started with Spring Boot and Kafka. We will be doing spring boot configurations and stream log4j2. They are installed respectively in the Zookeeper, Kafka and Solr subdirectory. sh --zookeeper localhost:2181 --alter --topic my-topic --delete-config max. x and note that it is important that all akka-* dependencies are in the same version, so it is recommended to depend on them explicitly to avoid problems with transient dependencies causing an unlucky mix of versions. Intro to Apache Kafka - [Instructor] Okay, so now that we are ready to start programming, we've included the dependencies of Kafka in the logging, we can start writing our first producer. zookeeper » zookeeper » 3. Apache Kafka is a distributed streaming platform. Zookeeper serves as the coordination interface between the Kafka brokers and consumers. gz compression. Apache Kafka depends on Zookeeper for cluster management. 1) via Maven which automatically resolved dependency of zkclient (0. Compile Dependencies (11) Category/License Group / Artifact Version Updates;. If you use the default Kafka version, then ensure that you exclude the kafka broker jar from the spring-cloud-starter-stream-kafka dependency as following. The resulting client load on ZooKeeper can be significant, therefore this solution is discouraged. This is what Kafka does instead of just sitting behind a load balancer like a normal server. To enable it set the server config delete. Add this to the pom. Kafka in the Precog project is an unnecessary distraction. Check this project's setup. The Alpakka project is an open source initiative to implement stream-aware and reactive integration pipelines for Java and Scala. Restricting the Kafka User Now that all of the installations are done, you can remove the kafka user. As you configure services for Cloudera Manager, refer to the tables below for the appropriate version. gcc --version gives the version of gcc as 4. Complete Spark Streaming topic on CloudxLab to refresh your Spark Streaming and Kafka concepts to get most out of this guide. Apache Kafka is a distributed streaming platform which enables you to publish and subscribe to streams of records, similar to enterprise messaging system. In this example, those would be:. Before that, clients had to manage offsets themselves or store them in ZooKeeper. 0 is production-ready software. Start Zookeeper and Kafka. Dependencies To. ZooKeeper’s syncLimit. The Kafka cluster stores streams of records in categories called topics. The Schema Registry and provides RESTful interface for managing Avro schemas It allows the storage of a history of schemas which are versioned. 10，zookeeper版本为：zookeeper-3. Using these tools, operations is able manage partitions and topics, check consumer offset position, and use the HA and FT capabilities that Apache Zookeeper provides for Kafka. splunk-guide-for-kafka-monitoring Documentation, Release 1 (continued from previous page) ## Size for data log dir, which is a dedicated log device to be used, and helps. I am trying to deploy a standalone cluster but running into ClassNotFound errors. Let IT Central Station and our comparison database help you with your research. Let's look at image below. In this article we'll use. 1) via Maven which automatically resolved dependency of zkclient (0. Available as of Camel 2. Kafka Python client. This post really picks off from our series on Kafka architecture which includes Kafka topics architecture, Kafka producer architecture,Kafka consumer architecture and Kafka ecosystem architecture. 2 For projects that support PackageReference , copy this XML node into the project file to reference the package. name setting in the config/server. Remove the. Before starting Kafka containers we have to start ZooKeeper server, which is used by Kafka. In this tutorial, we need another Zookeeper Docker run on a separated container. This post was jointly written by Neha Narkhede, co-creator of Apache Kafka, and Flavio Junqueira, co-creator of Apache ZooKeeper. We chose Kafka for its consistency and availability, ability to provide ordered messages logs, and its impressive throughput. Testing with Avro and Schema Registry. We used the replicated Kafka topic from producer lab. repartition topics) upon rebalance, inside InternalTopicManager which is triggered by StreamPartitionAssignor. Apache Kafka Interview Questions And Answers 2019. Apache Kafka is an open-source, fault-tolerant distributed event streaming platform developed by LinkedIn. \bin\windows\zookeeper-server-start. In an existing application, change the regular Kafka client dependency and replace it with the Pulsar Kafka wrapper. Kafka does rely upon a small cluster of Zookeeper nodes to manage responsibilities of each broker. Also, we will see Kafka Stream architecture, use cases, and Kafka streams feature. The Syslog-ng Kafka source in Java – An Introduction Kafka source is my Google summer of code project for the year 2016 with the Syslog-ng organization under the guidance of Viktor Juhász. Let IT Central Station and our comparison database help you with your research. The following tables list service dependencies that exist between various services in a Cloudera Manager deployment. Conclusion. The application can further be built into a. Storm is very fast and a benchmark clocked it at over a million tuples processed per second. Net --version 3. \config\zookeeper.