{"id":1774,"date":"2021-09-29T06:00:00","date_gmt":"2021-09-29T11:00:00","guid":{"rendered":"https:\/\/www.bigdatainrealworld.com\/?p=1774"},"modified":"2023-02-19T07:31:05","modified_gmt":"2023-02-19T13:31:05","slug":"what-are-applications-jobs-stages-and-tasks-in-spark","status":"publish","type":"post","link":"https:\/\/www.bigdatainrealworld.com\/what-are-applications-jobs-stages-and-tasks-in-spark\/","title":{"rendered":"What are applications, jobs, stages and tasks in Spark?"},"content":{"rendered":"<p>We get a lot of questions on the differences in Spark applications, jobs, stages and tasks. Also we see there is a lot of misunderstanding about these topics with new learners and experienced Spark developers alike. So our goal with this post is to give you a crisp pointer on each of these concepts in Spark.<br \/>\n<script src=\"https:\/\/embed.lpcontent.net\/leadboxes\/current\/embed.js\" async=\"\" defer=\"\"><\/script><\/p>\n<p style=\"border:1px; border-style:solid; border-color:#005cb9; background-color:#f1f5f9; padding: 1em;\">\nDo you like us to send you a 47 page Definitive guide on Spark join algorithms? ===&gt; <button data-leadbox-popup=\"iRwJt3SrgaavPhqQ3dnrtg\" data-leadbox-domain=\"ccubecompany.lpages.co\" style=\"background: rgb(175, 191, 0);border-color: rgb(175, 191, 0);border-radius: 20px;color: #FFFFFF;display: inline-block;vertical-align: middle;padding: 16px 32px;min-width: 192px;border: 1px solid rgb(175, 191, 0);font-size: 1rem;font-family: Helvetica, Arial, sans-serif;text-align: center;outline: 0;line-height: 1;cursor: pointer;-webkit-transition: background 0.3s, color 0.3s, border 0.3s;transition: background 0.3s, color 0.3s, border 0.3s;  box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.6);\">Send me the guide<\/button><\/p>\n<h2><span style=\"font-weight: 400;\">Task<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Task is the smallest execution unit in Spark. A task in spark executes a series of instructions. For eg. reading data, filtering and applying map() on data can be combined into a task. Tasks are executed inside an executor.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Stage<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A stage comprises several tasks and every task in the stage executes the same set of instructions.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Job<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A job comprises several stages. When Spark encounters a function that requires a shuffle it creates a new stage. Transformation functions like reduceByKey(), Join() etc will trigger a shuffle and will result in a new stage. Spark will also create a stage when you are reading a dataset.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Application<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">An application comprises several jobs. A job is created, whenever you execute an action function like write().<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Summary<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A Spark application can have many jobs. A job can have many stages. A stage can have many tasks. A task executes a series of instructions.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We get a lot of questions on the differences in Spark applications, jobs, stages and tasks. Also we see there is a lot of misunderstanding about<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-1774","post","type-post","status-publish","format-standard","hentry","category-spark"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are applications, jobs, stages and tasks in Spark? - Big Data In Real World<\/title>\n<meta name=\"description\" content=\"A short 2 minute read to understand the difference between applications, jobs, stages and tasks in Spark.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bigdatainrealworld.com\/what-are-applications-jobs-stages-and-tasks-in-spark\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are applications, jobs, stages and tasks in Spark? 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