{"id":71774,"date":"2017-12-29T07:00:34","date_gmt":"2017-12-29T05:00:34","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=71774"},"modified":"2017-12-28T10:49:40","modified_gmt":"2017-12-28T08:49:40","slug":"apache-pulsar-distributed-pub-sub-messaging-system","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2017\/12\/apache-pulsar-distributed-pub-sub-messaging-system.html","title":{"rendered":"Apache Pulsar: Distributed Pub-Sub Messaging System"},"content":{"rendered":"<p><a href=\"https:\/\/pulsar.apache.org\/\">Apache Pulsar<\/a> is an open-source distributed pub-sub messaging system originally\u00a0created at <a href=\"https:\/\/developer.yahoo.com\/open-source\/\">Yahoo<\/a> and part of the <a href=\"https:\/\/apache.org\/\">Apache Software Foundation<\/a>.<\/p>\n<p>Pulsar is a multi-tenant, high-performance solution for server-to-server messaging .<\/p>\n<p>Pulsar\u2019s key features include [4] :<\/p>\n<ul>\n<li>Native support for multiple clusters in a Pulsar instance, with seamless <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/admin\/GeoReplication\">geo-replication<\/a>of messages across clusters<\/li>\n<li>Very low publish and end-to-end latency<\/li>\n<li>Seamless scalability out to over a million topics<\/li>\n<li>A simple <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/#client-api\">client API<\/a> with bindings for <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/clients\/Java\">Java<\/a>, <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/clients\/Python\">Python<\/a>, and <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/clients\/Cpp\">C++<\/a><\/li>\n<li>Multiple <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/#subscription-modes\">subscription modes<\/a> for topics (<a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/#exclusive\">exclusive<\/a>, <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/#shared\">shared<\/a>, and <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/#failover\">failover<\/a>)<\/li>\n<li>Guaranteed message delivery with <a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/#persistent-storage\">persistent message storage<\/a> provided by <a href=\"http:\/\/bookkeeper.apache.org\/\">Apache BookKeeper<\/a><\/li>\n<\/ul>\n<h2>Architecture overview<\/h2>\n<p>At the highest level, a Pulsar instance is composed of one or more Pulsar clusters. Clusters within an instance can replicate\u00a0data amongst themselves [4].<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<p>The diagram below provides an illustration of a Pulsar cluster:<\/p>\n<p><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/pulsar_system_architecture.png\"><img decoding=\"async\" class=\"aligncenter wp-image-71789\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/pulsar_system_architecture.png\" alt=\"\" width=\"860\" height=\"569\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/pulsar_system_architecture.png 1181w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/pulsar_system_architecture-300x198.png 300w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/pulsar_system_architecture-768x508.png 768w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/pulsar_system_architecture-1024x677.png 1024w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><\/a><\/p>\n<h2>Pulsar Comparison with Apache Kafka<\/h2>\n<p>The table below lists the similarities and differences between Apache Pulsar and Apache Kafka [5]:<\/p>\n<table border=\"1\">\n<thead>\n<tr>\n<th><\/th>\n<th>Kafka<\/th>\n<th>Pulsar<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Concepts<\/td>\n<td>Producer-topic-consumer group-consumer<\/td>\n<td>Producer-topic-subscription-consumer<\/td>\n<\/tr>\n<tr>\n<td>Consumption<\/td>\n<td>More focused on streaming, exclusive messaging on partitions. No shared consumption.<\/td>\n<td>Unified messaging model and API.<\/p>\n<ul>\n<li>Streaming via exclusive, failover subscription<\/li>\n<li>Queuing via shared subscription<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td>Acking<\/td>\n<td>Simple offset management<\/p>\n<ul>\n<li>Prior to Kafka 0.8, offsets are stored in ZooKeeper<\/li>\n<li>After Kafka 0.8, offsets are stored on offset topics<\/li>\n<\/ul>\n<\/td>\n<td>Unified messaging model and API.<\/p>\n<ul>\n<li>Streaming via exclusive, failover subscription<\/li>\n<li>Queuing via shared subscription<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td>Retention<\/td>\n<td>Messages are deleted based on retention. If a consumer doesn\u2019t read messages before retention period, it will lose data.<\/td>\n<td>Messages are only deleted after all subscriptions consumed them. No data loss even the consumers of a subscription are down for a long time.<\/p>\n<p>Messages are allowed to keep for a configured retention period time even after all subscriptions consume them.<\/td>\n<\/tr>\n<tr>\n<td>TTL<\/td>\n<td>No TTL support<\/td>\n<td>Supports message TTL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Conclusion<\/h2>\n<p>Apache Pulsar is an effort undergoing incubation at <a href=\"http:\/\/www.apache.org\/\">The Apache Software Foundation (ASF)<\/a>\u00a0[3] sponsored by the Apache Incubator PMC. It seems\u00a0that it will be a competitive alternative to Apache Kafka due to its unique features.<\/p>\n<p><em>Resources:<\/em><\/p>\n<p>[1]\u00a0<a href=\"https:\/\/pulsar.apache.org\/\">https:\/\/pulsar.apache.org\/<\/a><\/p>\n<p>[2]\u00a0<a href=\"https:\/\/developer.yahoo.com\/open-source\/\">https:\/\/developer.yahoo.com\/open-source\/<\/a><\/p>\n<p>[3] <a href=\"https:\/\/apache.org\">https:\/\/apache.org<\/a>\/<\/p>\n<p>[4]\u00a0<a href=\"https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/\">https:\/\/pulsar.apache.org\/docs\/latest\/getting-started\/ConceptsAndArchitecture\/<\/a><\/p>\n<p>[5]\u00a0<a href=\"https:\/\/streaml.io\/blog\/pulsar-streaming-queuing\/\">https:\/\/streaml.io\/blog\/pulsar-streaming-queuing\/<\/a><\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>Published on Java Code Geeks with permission by Furkan Kamaci, partner at our <a href=\"http:\/\/www.javacodegeeks.com\/join-us\/jcg\/\" target=\"_blank\" rel=\"noopener\">JCG program<\/a>. See the original article here: <a href=\"http:\/\/furkankamaci.com\/apache-pulsar-distributed-pub-sub-messaging-system\/\" target=\"_blank\" rel=\"noopener\">Apache Pulsar: Distributed Pub-Sub Messaging System<\/a><\/p>\n<p>Opinions expressed by Java Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Apache Pulsar is an open-source distributed pub-sub messaging system originally\u00a0created at Yahoo and part of the Apache Software Foundation. Pulsar is a multi-tenant, high-performance solution for server-to-server messaging . Pulsar\u2019s key features include [4] : Native support for multiple clusters in a Pulsar instance, with seamless geo-replicationof messages across clusters Very low publish and end-to-end &hellip;<\/p>\n","protected":false},"author":908,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1643],"class_list":["post-71774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-apache-pulsar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Apache Pulsar: Distributed Pub-Sub Messaging System - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Apache Pulsar is an open-source distributed pub-sub messaging system originally\u00a0created at Yahoo and part of the Apache Software Foundation. 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