"""Executes transformation query to a new destination table.īq_client: Object representing a reference to a BigQuery Clientĭataset_ref = bq_client.get_dataset(bigquery.DatasetReference( String representation of a file's contents """Converts a SQL file holding a SQL query to a string. """Function called by PubSub trigger to execute cron job tasks.""" We will use data from the public dataset bigquery-public-data:sample, which holds data about repositories created between 20. We will specifically be looking for which owners created repositories with the most amount of forks and in which year they were created. The script is basic: it executes a SQL query in BigQuery to find popular Github repositories. SQLFor this example, I’ll show you a simple Python script that I want to run daily at 8 AM ET and 8 PM ET. When it is alerted, it then executes the Python script. This means that it is alerted whenever a new message is published. The Cloud Function subscribes to this topic. This is because the Cloud Scheduler job publishes a message to the topic. Essentially, the PubSub topic acts like a telephone line, providing the connection that allows the Cloud Scheduler job to talk, and the Cloud Function to listen. Our PubSub topic exists purely to connect the two ends of our pipeline: It is an intermediary mechanism for connecting the Cloud Scheduler job and the Cloud Function, which holds the actual Python script that we will run. In this example, we will publish a message to a PubSub topic. This can be a PubSub topic, HTTP endpoint, or an App Engine application. When setting up the job, you determine what exactly you will “trigger” at runtime. The nice part is that Cloud Scheduler handles all the heavy lifting for you: It retries in the event of failure and even lets you run something at 4 AM, so that you don’t need to wake up in the middle of the night to run a workload at otherwise off-peak timing. This task can be an ad hoc batch job, big data processing job, infrastructure automation tooling-you name it. In a nutshell, it is a lightweight managed task scheduler. Behold the magic of Cloud Scheduler, Cloud Functions, and PubSub!Ĭloud Scheduler is a managed Google Cloud Platform (GCP) product that lets you specify a frequency in order to schedule a recurring job. Regardless, no one likes doing the same thing every day if technology can do it for them. Or perhaps you need to update the data in a Pivot Table in Google Sheets to create a really pretty histogram to display your billing data. Maybe you’re executing a query in BigQuery and dumping the results in BigTable each morning to run an analysis. So, you find yourself executing the same Python script each day.
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