Kafka Adminclient Github

wurstmeister/kafka gives separate images for Apache Zookeeper and Apache Kafka while spotify/kafka runs both Zookeeper and Kafka in the same container. CAS Properties. me proxmox01. AdminClient. First is to have multiple consumer groups in place, but in this case, both groups will receive the same set of messages. Typically if you want to load test an OpenFin application you would need reproduce the user journeys through your application using a tool like JMeter, Gatling, or Locust. Kafka文档Kafka介绍:Kafka是由Apache软件基金会开发的一个开源流处理平台,由Scala和Java编写。 Kafka是一种高吞吐量的分布式发布订阅消息系统,它可以处理消费者规模的网站中的. fetchTopicOffsets returns most recent offset for a topic. Future objects keyed by the entity. A related discipline is that of building 12-factor Applications, in which development practices are aligned with delivery and operations goals — for instance, by using declarative programming and management and monitoring. This may happen due to. Promise based HTTP client for the browser and node. In this blog, I will thoroughly explain how to build an end-to-end real-time data pipeline by building four micro-services on top of Apache Kafka. Hope u get what u want… A good place to start would be the sample shell scripts shipped with Kafka. Based on my /etc/hosts we can see localhost has a different IP from the hostname ( proxmox01 ): [email protected] ~> cat /etc/hosts 127. Run the testsuite with the specified options and the specified vertx instance. Generic events for both Consumer and Producer. github pull request. 0 and later. 0 and have been having Replication issues between the two version, and I was wondering if anyone was. 例如,Github将使用包含提交列表的JSON主体和“X-Github-Event”等于“push”的头文件发送到webhook。如果在spring-cloud-config-monitor库中添加依赖关系并激活配置服务器中的Spring Cloud Bus,则启用“/ monitor”端点。. Let’s take a look at some of the best open source tools that are available to us today for containerisation. We visualize these cases as a tree for easy understanding. InstanceAlreadyExistsException. yml configuration for Docker Compose that is a very good. Kafka用sasl保护,监听器是SASL_PLAINTEXT,机制是PLAIN. Typically if you want to load test an OpenFin application you would need reproduce the user journeys through your application using a tool like JMeter, Gatling, or Locust. 2013-06-10T13:14:54. GitHub Pull Request #4224. kafka » kafka-clients Apache Kafka. If you are a Java developer, you should read this and, like I did a few months ago, consider the option of learning Kotlin. AdminClient is available in version 1. Introduction. It may take several seconds after AdminClient#createTopics returns success for all the brokers to become aware that the topics have been created. By injecting a NewTopic instance, we’re instructing the Kafka’s AdminClient bean (already in the context) to create a topic with the given configuration. 250 proxmox01. Apache Kafka系列(一) 起步 Apache Kafka系列(二) 命令行工具(CLI) Apache Kafka系列(三) Java API使用 Apache Kafka系列(四) 多线程. Kafka makes so many things easier to do, from managing metrics to processing streams of data. But since the client is using PLAINTEXT on an SSL port, the client is interpreting SSL handshake protocol messages as Kafka requests. setUseEventLoop(Boolean) is not set to false. Note: If you configure Kafka brokers to require client authentication by setting ssl. auth to be requested or required on the Kafka brokers config, you must provide a truststore for the Kafka brokers as well. 1 and Kafka 0. The Server part contains the Admin user interface and runs independently from the monitored applications. enable": true`) or by calling `. AutoCloseable The administrative client for Kafka, which supports managing and inspecting topics, brokers, configurations and ACLs. Spring Boot - Apache Kafka - Apache Kafka is an open source project used to publish and subscribe the messages based on the fault-tolerant messaging system. Spring boot에서 kafka 사용시 application. However, Ubuntu "snapshots" a specific version of PostgreSQL that is then supported throughout the lifetime of that Ubuntu version. The Kafka Lag Exporter repository hosts a Helm Chart to easily deploy the Kafka Lag Exporter into existing Kubernetes and OpenShift clusters. , and to maintain source of truth. This page provides Java source code for RocksDBStore. Update, September 2016. 11版本之前,kafka的服务器端代码(即添加kafka_2. Es en el ambiente de windows y aquí está mi kafka del servidor de código en eclipse…. Fanout is a common pattern when we are talking about messaging driven apps. Broker may not be available. Kafka APIs from within a log handler or perform any prolonged operations. Writable stream integrating with the Kafka Producer. Find and contribute more Kafka tutorials with Confluent, the real-time event streaming experts. Kafka用sasl保护,监听器是SASL_PLAINTEXT,机制是PLAIN. See also docs. jar 檔案上傳至 Apache Kafka 叢集的工具,目前與 Amazon MSK 不相容,這些工具包括 Confluent Control Center 、Confluent Auto Data Balancer 、Uber uReplicator 和 LinkedIn Cruise Control 。. There is only one method in JoinStreamToTableTest annotated with @Test , and that is testJoin(). Kafka Streams. Starting with the 0. First is to have multiple consumer groups in place, but in this case, both groups will receive the same set of messages. P roducer: Do drop a comment if you require more info on the Kotlin code in my GitHub. 0, which contains a number of new features, performance improvements and bug fixes, including: More use of AdminClient in commands: kafka-preferred-replica-election. Spring Boot uses Apache Commons logging for all internal logging. js wrapper. This project supports Heroku, Azure, Cloud Foundry, and Amazon Web Services (AWS). Hint: If your application registers a signal notification (signal. A new method will be added to the AdminClient abstract class to support this new version of the RPC. 甚至 Kafka 在这基础上还优化出了层级时间轮,这些都是后话了,大家感兴趣的话可以自行搜索资料或者抽时间我再完善一次。 这篇文章从前期准备到撸码实现还是花了不少时间,如果对你有帮助的话还请点赞转发。 本文的所有源码都可在此处查阅:. 1 API) Kafka Connect API. spring-boot-plus是一套集成spring boot常用开发组件的后台快速开发框架。 它是一个易于使用,快速,高效,功能丰富,开源的spring boot 脚手架。. AdminClient is available in version 1. Broker may not be available. Kafka Tool is a GUI application for managing and using Apache Kafka clusters. This are the first versions of the new IDE for Hyperledger Fabric development. A new method AdminClient#metrics(), has been added to AdminClient. The Kafka topic we're going to use. KAFKA-5856; Add AdminClient. kafka » kafka-clients Apache Kafka. By default the buffer size is 100 messages and can be changed through the highWaterMark option. 由于大家日常生产开发中,对kafka生产者,消费者可以支持的配置可能有所困惑,这里我们写一片文章帮助大家答疑解惑。 本文基于 Kafka的1. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Apache Kafka is an open source project used to publish and subscribe the messages based on the fault-tolerant messaging system. It takes buffers of data and puts them into the appropriate Kafka topic. 509 certificates and be familiar with the Cluster security scenarios. properties. Will try to do the above operations using Kafka Admin Client API and then will write a simple producer and consumer that sends and messages to the Topic we create. > bin/kafka-topics. [HTML&CSS] column 속성으로 다단으로 편. NET client in particular. Commercial support. 很多用户都有直接使用程序API操作Kafka集群的需求。在0. Find and contribute more Kafka tutorials with Confluent, the real-time event streaming experts. This section provides a list common CAS properties and references to the underlying modules that consume them. The Linux operating. [ { "name": "mocha", "repo": "https://github. Usage of optional fields from protocol versions that are not supported by the broker will result in IncompatibleBrokerVersion exceptions. The proposed change includes using:. aidp - kafka consumer embedded Lua scripting language in data process framework Yandex ClickHouse. Defines an Apache Kafka admin client. Under Advanced kafka-env add the following lines to the end of the kafka-env template property. This Site has been developed to help programmers learn and share knowledge. Commercial support. The API for this class is still evolving and we may break compatibility in minor releases, if necessary. We visualize these cases as a tree for easy understanding. - PR & review - Execute apps from jenkins. If you need finer control over partitions or keys, this is probably not the class for you. Kafka admin client: A new version of the native Kafka Admin Client API. Reddit gives you the best of the internet in one place. It may take several seconds after AdminClient#createTopics returns success for all the brokers to become aware that the topics have been created. 很多用户都有直接使用程序API操作Kafka集群的需求。在0. Hope it helps people learn. fetchTopicOffsets returns most recent offset for a topic. This page provides Java source code for RocksDBStore. IAsyncSerializer Defines a serializer for use with Confluent. Apache Kafka系列(一) 起步 Apache Kafka系列(二) 命令行工具(CLI) Apache Kafka系列(三) Java API使用 Apache Kafka系列(四) 多线程. Confluent's Apache Kafka. In this tutorial, we shall learn Kafka Producer with the help of Example Kafka Producer in Java. The bank application simulates an actual bank where you can open an account and transfer money. Over time we came to realize many of the limitations of these APIs. The following example assumes that you are using the local Kafka configuration described in [Running Kafka in Development](/docs/running-kafka-in-development). Args: kafka_admin_client (Kafka Admin Client Obj): Kafka Admin Client Obj for the brokers Return: kafka_topics (Dict of Kafka Topics): Key is the topic name and value is a Kafka metadata object that has basic topic information """. But with Kafka there are only two ways that I know of that we can have this in our system. Front end is built with AngularJs, HTML, and Java script. Kafka: this is perhaps obvious as a topic, however I needed to learn particular facets of Kafka related to its reliability, resilience, scalability, and find ways to monitor its behaviour. Package kafka provides high-level Apache Kafka producer and consumers using bindings on-top of the librdkafka C library. 314 bugs on the web resulting in javax. It works in concert with the Go source code generated for. First is to have multiple consumer groups in place, but in this case, both groups will receive the same set of messages. When developing KafkaJS, we run a Kafka cluster in a similar way to what is described in Running Kafka in Development, using docker and docker-compose. 在上一篇文章《集群管理工具KafkaAdminClient——原理与示例》中讲述了KafkaAdminClient的功能以及相应的原理,但是同时也提出了目前的KafkaAdminClient并没有非常的完善,还有许多功能还需要去丰富,这些功能可以自定义实现,在《如何获取Kafka的消费者详情——从Scala到Java的切换》一文中介绍. Various properties can be specified in CAS either inside configuration files or as command line switches. This relationship has led to critical production-ready improvements, especially around reliability and deployment, and continued work to further security integrations. Kafka中最常用的是Producer API(发送消息)和Consumer API(消费消息),另外还有Streams API、Connector API、AdminClient API; In Kafka the communication between the clients and the servers is done with a simple, high-performance, language agnostic TCP protocol. Motivation. zip Download. It provides a simple and completely interactive SQL interface for stream processing on Kafka; no need to write code in a programming language such as Java or Python. The Event Hubs for Kafka feature provides a protocol head on top of Azure Event Hubs that is binary compatible with Kafka versions 1. I am finding that when I use kafka-consumer-groups. This is the second post of a 2-part introduction to Kotlin, a programming language for the JVM. proto files by the protocol compiler. Download python-kafka-doc_1. Scala has no local warning suppression (see e. This page provides Java source code for RocksDBStore. but I added Kafka kafka_2. jump to content. 1 localhost. This project supports Heroku, Azure, Cloud Foundry, and Amazon Web Services (AWS). my subreddits. If you are a Java developer, you should read this and, like I did a few months ago, consider the option of learning Kotlin. If you are a beginner to Kafka, or want to gain a better understanding on it, please refer to this link − www. Apache Kafka License: Apache 2. 인프라 진단 / 서버 자동화 / 클라우드 플랫폼 관련 개발/운영을 하고 있습니다. 사용자 새로비 [오라클 DB] 오라클 테이블 생성하기 사용자 새로비 [MariaDB] MariaDB 다운로드 및 설치 - w. 0, which contains a number of new features, performance improvements and bug fixes, including: More use of AdminClient in commands: kafka-preferred-replica-election. Various properties can be specified in CAS either inside configuration files or as command line switches. Github4s: A GitHub API wrapper written in Scala. This is another common reason of java. Update, September 2016. Note also that these are not mutually exclusive. Also you can get it from the GitHub mirror. Spring boot에서 kafka 사용시 application. Writable stream integrating with the Kafka Producer. node-rdkafka now supports the admin client for creating, deleting, and scaling out topics. See also docs. Changes we've to do in the REST service. Kafka에 Message에 대해 Produce를 할때 서버로부터 ack를 어떻게 받는지에 대한 설정이다. This is aim to remove dependencies to `core` module. Join GitHub today. io's Slack page. You may start using the Kafka endpoint from your applications with no code change but a minimal configuration change. Kafka managed consumer offset is now consumed by KafkaManagedOffsetCache from the "__consumer_offsets" topic. kafka下载 入门 Kafka的使用场景 快速启动kafka kafka的生态系统 接口 kafka接口API 生产者客户端(0. A traditional queue retains messages in-order on the server, and if multiple consumers consume from the queue then the server hands out messages in the order they are stored. deb for Debian Sid from Debian Main repository. If you are a Java developer, you should read this and, like I did a few months ago, consider the option of learning Kotlin. Yet it seems that so many things we have done to this point in configuring and managing it have been object studies in how to make our lives, as the plumbers who keep the data flowing, more difficult than they have to be. Kafka中最常用的是Producer API(发送消息)和Consumer API(消费消息),另外还有Streams API、Connector API、AdminClient API; In Kafka the communication between the clients and the servers is done with a simple, high-performance, language agnostic TCP protocol. kafka » kafka-clients Apache Kafka. We also support a large number of integrations with other tools, systems, and clients. GitHub Gist: instantly share code, notes, and snippets. Zookeeper just contains a copy of the ACLs instead of being the source. This is a scraper that runs on Morph. Kafka has support for using SASL to authenticate clients. We will add Java AdminClient to Kafka Streams, in order to replace the internal StreamsKafkaClient. // Using sh -xv to trace kafka-server-start. Inspired by How I hacked Slack into a community platform with Typeform and Socket. 11 implemented KIP-117, thus providing a new type of Kafka client - org. compose-fixtures or join-fixtures may be used to build fixtures combine topologies. Silencer: Scala compiler plugin for warning suppression. It has recently gained exactly-once capability when running against a. Learn to split a stream of events into substreams using Kafka Streams with full code examples. edit subscriptions. 8 and beyond. You can use Kafka Streams to easily develop lightweight, scalable, and fault-tolerant stream processing apps. The Streams API makes it possible to effectively transform input streams of records to output streams. Sign in with GitHub; Search. Future objects keyed by the entity. The Kafka topic we're going to use. For upstream release notes, see Apache Kafka version 2. GitHub Gist: instantly share code, notes, and snippets. There's a new Java AdminClient API that is coming soon in Apache Kafka which would probably be the best way to get this info, although I'm not sure when info about consumer groups will be exposed in it (it is part of KIP-4 which is a large, multi-stage effort). See also docs. Package kafka provides high-level Apache Kafka producer and consumers using bindings on-top of the librdkafka C library. GitBook is where you create, write and organize documentation and books with your team. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. When a port is configured for SSL, broker expects SSL handshake messages before any Kafka requests are sent. Confluent Platform includes client libraries for multiple languages that provide both low-level access to Apache Kafka® and higher level stream processing. 0 0mq 0xdm5 0xffffff 10io-jekyll 10to1-crack 10xengineer-node 1234567890_ 12_hour_time 16watts-fluently 189seg 193_linecache19 193_ruby-debug19 193_ruby-debug-base19 1. It is solved now. Spring Boot - Sending Email - By using Spring Boot RESTful web service, you can send an email with Gmail Transport Layer Security. Admin Client. Below is a summary of the JIRA issues addressed in the 0. 0-experimental-2 but doesn't allow creating topics etc. Update TTL for a topic so records stay in the topic for 10 days. 2 includes Apache Kafka 2. Usage of optional fields from protocol versions that are not supported by the broker will result in IncompatibleBrokerVersion exceptions. This page provides Java source code for RocksDBStore. AdminClient is available in version 1. Apache Kafka系列(一) 起步 Apache Kafka系列(二) 命令行工具(CLI) Apache Kafka系列(三) Java API使用 Apache Kafka系列(四) 多线程. The JavaCompatiblePartitioner should be compatible with the default partitioner that ships with the Java Kafka client. We provide a "template" as a high-level abstraction for sending messages. io's Slack page. 适读人群 :本书既适合Spring Cloud初学者入门使用,又适合正在做微服务实践的架构师或打算实施微服务的团队作为参考用书,同时也可作为高等院校计算机相关专业的师生用书和培训学校的教材。. 项目介绍 SpringBoot实战之旅---书籍配套源码 书籍介绍 本书内容共分为14章,开发工具使用IntelliJ IDEA,Spring Boot版本为2. Inspired by How I hacked Slack into a community platform with Typeform and Socket. CAS - Enterprise Single Sign-On for the Web. Turns out that the ' --security-protocol PLAINTEXTSASL ' is not honored by the kafka-consumer-groups. The following example assumes that you are using the local Kafka configuration described in [Running Kafka in Development](/docs/running-kafka-in-development). Apache Kafka has some built-in client tools to produce and consume messages against Apache Kafka broker. The Spring for Apache Kafka project applies core Spring concepts to the development of Kafka-based messaging solutions. me proxmox01. xml file from the spring-boot github repo. I had correctly set the machine's hostname in my Kafka server. Github4s: A GitHub API wrapper written in Scala. Silencer: Scala compiler plugin for warning suppression. Jackdaw is a Clojure library for the Apache Kafka distributed streaming platform. Heroku Kafka Manager. I have a use case where I want to assign a consumer to a partition, and have no other consumer consume that partition, I know this sounds easy with using a consumer group and using the subscribe me. This Site has been developed to help programmers learn and share knowledge. Defines an Apache Kafka admin client. bin\windows\kafka-topics. : Enterprise Edition 6. Admin Client. The MySQL Connector should use this to create the database history topic. However, Ubuntu "snapshots" a specific version of PostgreSQL that is then supported throughout the lifetime of that Ubuntu version. md#installing)-[Run](https://gitlab. To create an Admin client, you can do as follows:. Returns a fixture that builds and starts kafka streams for the supplied topology before running the test function (and then tears it down when the test is complete). Yahoo Kafka Manager Topic View. Commercial support. io's Slack page. In this blog, I will thoroughly explain how to build an end-to-end real-time data pipeline by building four micro-services on top of Apache Kafka. From the Kafka cluster, the message will be ingested to Logstash. Apps operation • Settings are managed by Github. Let’s take a look at some of the best open source tools that are available to us today for containerisation. Apache Cassandra Or RDBMS(MySql for ex) datastore stores all users, teams, topicRequests, request and execution data from all the users. IConsumer Defines a high-level Apache Kafka consumer (with key and value. It also provides support for Message-driven POJOs with @KafkaListener annotations and a "listener container". Kafka APIs from within a log handler or perform any prolonged operations. The following example assumes that you are using the local Kafka configuration described in [Running Kafka in Development](/docs/running-kafka-in-development). * Kafka的AdminClient函式庫,支持管理和檢查topics, brokers. Refer to the examples GitHub repo for code connecting to a cloud streaming data service based on Apache Kafka Link your program with -lrdkafka (C) or -lrdkafka++ (C++). There is a single thread per cluster consuming this topic so it may not be able to keep up on large # of offsets being pushed to the topic. Apache Cassandra Or RDBMS(MySql for ex) datastore stores all the meta information like users, teams, topicRequests, request and execution data from all the users. 项目介绍 SpringBoot实战之旅---书籍配套源码 书籍介绍 本书内容共分为14章,开发工具使用IntelliJ IDEA,Spring Boot版本为2. Currently, KafkaJS supports PLAIN , SCRAM-SHA-256 , SCRAM-SHA-512 , and AWS mechanisms. For each Topic, you may specify the replication factor and the number of partitions. x is a tool-kit for building reactive applications on the JVM. com/mochajs/mocha", "description": "simple, flexible, fun test framework", "dependents": 178529 }, { "name": "request. KAFKA-6960 Remove the methods from the internal Scala AdminClient that are provided by the new AdminClient. Serialization. It may take several seconds after AdminClient#createTopics returns success for all the brokers to become aware that the topics have been created. Alternatively, you can get money into the system by simply depositing money with the push of a button. Find and contribute more Kafka tutorials with Confluent, the real-time event streaming experts. This client enables users to programmatically execute admin tasks without relying on those old internal classes or even Zookeeper – all Zookeeper tasks are executed by brokers. To create an Admin client, you can do as follows:. Efforts have been taken to attach screen shot and provide hands on implementation details. In the currently available releases, Fabric offers a CFT ordering service implemented with Kafka and Zookeeper. put('bootstrap. Kafka admin client: A new version of the native Kafka Admin Client API. 具体的KafkaAdminClient包含了一下几种功能(以Kafka1. The Kafka AdminClient provides admin operations for Kafka brokers, topics, groups, and other resource types supported by the broker. After cloning this kafka-oauth2 Github repo, WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/1271:9093) terminated during authentication. In this blog we will look at how we can use Node. AdminClient. org #apache-kafka channel. I have been trying to to use AdminClient to get the lag of a consumer but. CAS - Enterprise Single Sign-On for the Web. 0 and Spring Boot 2. Front end is built with AngularJs, HTML, and Java script. He also likes writing about himself in the third person, eating good breakfasts, and drinking good beer. A tiny web application to invite a user into your Slack team. There is a new broker start time metric. DBeaver Universal Database Tool Free multi-platform database tool for developers, SQL programmers, database administrators and analysts. class codehaus config database doc eclipse example extension github google groovy gwt http ide jboss json library. Object implements java. Here Coding compiler sharing a list of 30 Kafka interview questions for experienced. CAS by default will attempt to locate settings and properties inside a given directory indicated under the setting name cas. Edit on GitHub Endorsement policies ¶ Every chaincode has an endorsement policy which specifies the set of peers on a channel that must execute chaincode and endorse the execution results in order for the transaction to be considered valid. Package kafka provides high-level Apache Kafka producer and consumers using bindings on-top of the librdkafka C library. Motivation. 很多用户都有直接使用程序API操作Kafka集群的需求。在0. Kafka中最常用的是Producer API(发送消息)和Consumer API(消费消息),另外还有Streams API、Connector API、AdminClient API; In Kafka the communication between the clients and the servers is done with a simple, high-performance, language agnostic TCP protocol. 11/13/2018; 9 minutes to read +13; In this article. Last released on Sep 9, 2016 Asynchronous HTTP client for interacting with Amazon S3. Based on my /etc/hosts we can see localhost has a different IP from the hostname ( proxmox01 ): [email protected] ~> cat /etc/hosts 127. deb for Debian Sid from Debian Main repository. Will try to do the above operations using Kafka Admin Client API and then will write a simple producer and consumer that sends and messages to the Topic we create. TLS CRL과 같은 표준 Kafka 액세스 제어 수단 또는 방화벽 기능을 활용하여 노드가 Kafka 클러스터에 연결하지 못하게합니다. Learn to split a stream of events into substreams using Kafka Streams with full code examples. Describe Topic. Technical detour. AdminClient. I'm using the AdminClient to fetch the consumer offsets of my topics. Kafka® is used for building real-time data pipelines and streaming apps. The need for a standard. You can programmatically create topics either using kafka-python or confluent_kafka client which is a lightweight wrapper around librdkafka. jump to content. It supports the following : Manage multiple clusters; Easy inspection of cluster state (topics, consumers, offsets, brokers, replica distribution, partition distribution). For instance Github will POST to the webhook with a JSON body containing a list of commits, and a header "X-Github-Event" equal to "push". bin\windows\kafka-topics. There are several advantages to this:. For any queries please reach us at [email protected] auth to be requested or required on the Kafka brokers config, you must provide a truststore for the Kafka brokers as well. How The Kafka Project Handles Clients. It will give you insights into the Kafka Producer…. sh now use the AdminClient, so no need to pass in --zookeeper!. – Hans Jespersen Nov 7 '17 at 7:28 updating my earlier comment to note that librdkafka now supports the Kafka AdminClient functions so any nodejs Kafka client that exposes those functions should allow creation of topics. Sign in with GitHub; Search. Describe Topic. All gists Back to GitHub. tak jak w temacie, odpalajac aplikacje springa przez dockera nie jest ona w stanie polaczyc sie z br. First is to have multiple consumer groups in place, but in this case, both groups will receive the same set of messages. The Azure Cosmos DB ODBC driver enables you to connect to Azure Cosmos DB using BI analytics tools such as SQL Server Integration Services, Power BI Desktop, and Tableau so that you can analyze and create visualizations of your Azure Cosmos DB data in those solutions. In this article, I will provide deeper technical analysis about the most important security enhancements that are part of the Confluent Platform 5. * * Use this to get the maximum read performance if you don't care about the * stream backpressure. Kafka中最常用的是Producer API(发送消息)和Consumer API(消费消息),另外还有Streams API、Connector API、AdminClient API; In Kafka the communication between the clients and the servers is done with a simple, high-performance, language agnostic TCP protocol. By default the buffer size is 100 messages and can be changed through the highWaterMark option. It is free and open source (). Presented by Rajini Sivaram, Pivotal. GitHub Gist: instantly share code, notes, and snippets. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: