{"id":515612,"date":"2022-12-05T09:34:00","date_gmt":"2022-12-05T09:34:00","guid":{"rendered":"https:\/\/www.devoteam.com\/expert-view\/apache-airflow-dag-scheduling-errors\/"},"modified":"2022-12-05T09:34:00","modified_gmt":"2022-12-05T09:34:00","slug":"apache-airflow-dag-scheduling-errors","status":"publish","type":"expert-view","link":"https:\/\/devoteam.info\/en-nl\/expert-view\/apache-airflow-dag-scheduling-errors\/","title":{"rendered":"Why my scheduled DAG does not run? Apache Airflow dynamic start date for equally\/unequally spaced interval"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">It\u2019s still always confusing the first time you start with Airflow. Why is a DAG not triggered when my scheduled time arrives? Why a DAG is not triggered at all saying \u201cthe task start time is later than execution time\u201d? My CRON job ranges from hours to months, how I should dynamically set up the start time? I asked myself all these questions when I was working with Airflow, and here I just want to make it a record of my understanding. The code snippets included in the article are tested on Airflow 2.2.5 + Composer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Airflow scheduler<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Apache Airflow is a powerful tool helping you to orchestrate and schedule your data pipelines. The key component here is Airow scheduler: Airflow scheduler monitors all tasks and DAGs, then triggers the task instances once their dependencies are complete.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><em>Airflow scheduler monitors all tasks and DAGs, then triggers the task instances once their dependencies are complete.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For a scheduled DAG to be triggered, one of the following needs to be provided:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Schedule interval: to set your DAG to run on a simple schedule, you can use: a preset, a cron expression or a<code> <\/code><kbd><sub><sup>datetime.timedelta<\/sup><\/sub><\/kbd><sup><sub> <\/sub><\/sup>. Schedule interval by default is set to None and this is also the case when you use manual or external trigger to the DAG. A preset provides easier, human readable schedule like <kbd><sup><sub>@hourly<\/sub><\/sup><\/kbd> , <sub><sup>@daily<\/sup><\/sub> . But what most commonly for more customized schedule is CRON job. Check this page to create your cron job: https:\/\/crontab.guru\/.<\/li>\n\n\n\n<li>Timetables. \u201cTimetables\u201d is a new concept introduced in Airflow 2.2. This provides more advanced scheduling possibilities, for example, if you want to \u201cskip\u201d some certain runs. However, this is not going to be part of this article \ud83d\ude42<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">   3. Data-aware scheduling with Dataset. This is also a new feature introduced since Airflow <br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Once we have our schedule ready, we have an expectation on when our Airflow DAG will run. But sometimes we found it not align with our expectation. Why? In this article, we will mainly discuss the case when you set your schedule with a CRON job (and some cases also applies to a preset)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-data-interval-logical-date-run-time\">Data interval, logical date, run time<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are several concepts are important if you wish to understand when your DAG will be scheduled.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>start_date<\/strong>: start date defines when your DAG will run for the rst time. a DAG run will only be scheduled one interval after<br><sub><sup><kbd>start_date<\/kbd><\/sup><\/sub><\/li>\n\n\n\n<li><strong>data interval<\/strong>: Data interval describes the time range between two DAG runs. For example, if you define the schedule with <sub><sup><kbd>30 22***<\/kbd> <\/sup><\/sub>(22:30daily),thenyourdataintervalwillbefrom22:30 to the same time next date. There are two values associates to the concept:<br>&#8211; <strong>logical_date \/ data_interval_start<\/strong>: this was used to be called execution date until Airflow 2.2, but as the value indicates thestart of the data interval, not the actual execution time, the variable name is updated.<br>&#8211; <strong>data_interval_end<\/strong>: the end of the data interval<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DAG run time<\/strong>: this is the actual DAG execution time. And according to Airflow\u2019s official document:<br>A DAG run is usually scheduled <strong>after<\/strong> its associated data interval has ended, to ensure the run is able to collect all the data within the time period.<br>For example, a DAG with schedule <sub><sup><kbd>30 22 * * *<\/kbd> <\/sup><\/sub>, you can clearly see in the screenshot:<br>&#8211; <strong>data_interval_start<\/strong>: 2022\u201310\u201305, 22:30<br>&#8211; <strong>data_interval_end<\/strong>: 2022\u201310\u201306, 22:30<br>&#8211; DAG run started: 2022\u201310\u201306, 22:30<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-12-05-at-12.34.00.png\" alt=\"\" class=\"wp-image-7653\" style=\"width:570px;height:344px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">What about <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub> ? According to documentation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Similarly, since the <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub>  argument for the DAG and its tasks points to the same logical date, it marks the start of the DAG\u2019s rst data interval, not when tasks in the DAG will start running. In other words, a DAG run will only be scheduled one interval after <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Basically, if the start date is earlier than the <strong>data_interval_start<\/strong>, the DAG will be scheduled.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-start-date-for-equally-spaced-interval\">Start date for equally spaced interval<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">So, how to set a start date?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The simplest is to set a fixed date, e.g. \u201c2020\u201310\u201301\u201d. However, if you set the <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub> too early, and have your <sub><sup><kbd>backfill<\/kbd><\/sup><\/sub> flag enabled, then the DAG run will catch up and initiate multiple runs from that datetime. This will also happen if you recreate your Airflow cluster, or happened to delete all your run history, thus, can be annoying.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And, if you set it too late, you might see the error \u201cthe task start time is later than execution time\u201d so that the DAG is not started.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>If I want to set a start date, which makes the DAG run exact once as soon as the DAG is submitted, regardless of the schedule, what time should it be? <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is easy to understand once we understand the data interval logic. Basically, you need to set the <sub><sup>start_date<\/sup><\/sub> before the current, and after the last . The timeline is shown as the figure below:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-12-05-at-12.36.43.png\" alt=\"\" class=\"wp-image-7654\" style=\"width:617px;height:232px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thus, for a <strong>daily<\/strong> scheduled DAG, the start_date is safe to set <strong>2 days<\/strong> ( = 2 intervals) ahead of current time. Similarly, for an <strong>hourly<\/strong> scheduled DAG, the <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub> should be <strong>2 hours<\/strong> ( = 2 intervals) ahead of the current time. Example for the daily schedule:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-12-05-at-12.37.51.png\" alt=\"\" class=\"wp-image-7655\" style=\"width:529px;height:94px\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-timezone\">Timezone<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">By default, Airflow applies UTC timezone. This applies either you schedule with a preset like<sub><sup><kbd> @daily<\/kbd><\/sup><\/sub> , or a cron job like <sub><sup><kbd>30 0 * * *<\/kbd><\/sup><\/sub> (at 0:30 daily). That is to say, so far the DAG is not timezone aware.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How to set it? The time zone is set in <sub><sup><kbd>airflow.cfg<\/kbd><\/sup><\/sub> . But a quick hack if you want to apply the timezone to individual DAGs, is just to apply the timezone on <sub><sup>start_date<\/sup><\/sub> . For example:<br><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-11-23-at-15.22.48.png\" alt=\"\" class=\"wp-image-7598\" style=\"width:418px;height:62px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><br><br>Works like a charm. Pendulum is pre-installed with Airflow so you can simply import the library. The DAG looks like:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-12-05-at-12.07.51.png\" alt=\"\" class=\"wp-image-7650\" style=\"width:458px;height:270px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Start date for unequally spaced interval<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now we want to move on to set up a start date dynamically for an unequally spaced interval, for example, let\u2019s say: <sub><sup><kbd>08 * * 2-3<\/kbd><\/sup><\/sub> . This schedules a DAG to run&nbsp;<em>8am every Tuesday and Wednesday.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exactly the same as before: <strong>If I want to set a start date, which makes the DAG run exact once as soon as the DAG is submitted, regardless of the schedule, what time should it be?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The trick is the same just as setting with equally spaced interval: <strong>find the data interval start.<\/strong> The figure below shows what are the valid <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub> ranges for two different target executions:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-12-05-at-12.12.58.png\" alt=\"\" class=\"wp-image-7651\" style=\"width:555px;height:289px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>An (almost) universal solution to set up start date with CRON job<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of the benefits of setting <strong>a dynamic<\/strong> <sub><sup><kbd><strong>start_date<\/strong><\/kbd><\/sup><\/sub> that<strong> makes the DAG run exact once as soon as the DAG is submitted<\/strong> is that: when you need to upgrade\/recreate your Airflow cluster, you don\u2019t need to worry about if a scheduled DAG has <sub><sup><kbd>backfill<\/kbd><\/sup><\/sub> configured, the problem we discussed earlier with a fixed <sub><sup><kbd>start_date<\/kbd><\/sup><\/sub> .<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And the trick is straightforward: find the The code snippet shows below:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/09\/Screenshot-2022-12-05-at-12.18.48.png\" alt=\"\" class=\"wp-image-7652\" style=\"width:571px;height:265px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So, why almost? This is not catching up&nbsp;Daylight Saving Time (DST)&nbsp;when one hour just pop out\/disappear from nothing during the day. There is workaround to avoid this problem. But my suggestion here will be: to keep it simple, avoid it, don\u2019t set your schedule around the certain clocks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>It\u2019s still always confusing the first time you start with Airflow. Why is a DAG not triggered when my scheduled time arrives? Why a DAG is not triggered at all saying \u201cthe task start time is later than execution time\u201d? My CRON job ranges from hours to months, how I should dynamically set up the [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","categories":[986],"tags":[],"industry":[1110],"class_list":["post-515612","expert-view","type-expert-view","status-publish","hentry","category-data-en-nl","industry-technology"],"acf":[],"cards":"\n\t<div class=\"single-post-card\">\n\n\t\t\n\n\t\t\n\t\t<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-43282307 wp-block-group-is-layout-flex\">\n\t<p style=\"font-style:normal;font-weight:700\" class=\"has-link-color wp-elements-1 wp-block-lp-post-type has-text-color has-primary-color has-small-font-size\">Expert View<\/p>\n\n\t\t\n\t\t<h3 style=\"font-style:normal;font-weight:400\" class=\"wp-block-post-title has-base-font-size\"><a href=\"https:\/\/devoteam.info\/en-nl\/expert-view\/apache-airflow-dag-scheduling-errors\/\" target=\"_self\" >Why my scheduled DAG does not run? 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Apache Airflow dynamic start date for equally\/unequally spaced interval"}]},{"@type":"WebSite","@id":"https:\/\/devoteam.info\/en-nl\/#website","url":"https:\/\/devoteam.info\/en-nl\/","name":"Devoteam","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/devoteam.info\/en-nl\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-NL"}]}},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"Julien Pawlowski","author_link":"https:\/\/devoteam.info\/en-nl\/author\/"},"uagb_comment_info":0,"uagb_excerpt":"It\u2019s still always confusing the first time you start with Airflow. Why is a DAG not triggered when my scheduled time arrives? Why a DAG is not triggered at all saying \u201cthe task start time is later than execution time\u201d? My CRON job ranges from hours to months, how I should dynamically set up the&hellip;","_links":{"self":[{"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/expert-view\/515612","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/expert-view"}],"about":[{"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/types\/expert-view"}],"version-history":[{"count":0,"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/expert-view\/515612\/revisions"}],"wp:attachment":[{"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/media?parent=515612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/categories?post=515612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/tags?post=515612"},{"taxonomy":"industry","embeddable":true,"href":"https:\/\/devoteam.info\/en-nl\/wp-json\/wp\/v2\/industry?post=515612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}