I started Docker on Windows 10 and then Kitematic desktop application. ![]() ![]() The pg_sleep(10) function will make the query sleep for 10 seconds before returning, essentially mimicking a slow-running query.ĭb, err = sql. Kitematic version 1.8.8 downloaded directly through Dicker > Kitematic > Download from Docker Desktop for Windows and extracted to C:\Program Files\Docker\Kitematic. To demonstrate this, I'll make a very basic web application with a handler that executes a SELECT pg_sleep(10) SQL query against a PostgreSQL database using the pq driver. In this scenario, nothing has really gone 'wrong', but there is no client left to return a response to so you may as well cancel the query and free-up the resources. This could happen for a number of reasons, such as a user closing a browser tab or terminating a process. What is your rclone version (output from rclone version) 1.54.0 Which OS you. Error: 'Reopening on read failure after 2425418571 bytes: retry 1/10: context canceled' number of bytes read varies. When a client goes away unexpectedly before the query completes. Ulduar song lyrics, Pink background download, Fatal error: curl/curl.h: no such file or directory, Rap song with violin in background, Poker site to play. What is the problem you are having with rclone Sync from AWS S3 to OCI object storage fails with read failures when using rclone API but sync completes successfully when using rclone at command line. In this scenario, you would probably want to cancel the query after a set period of time (so that resources are freed-up and the database connection is returned to the sql.DB connection pool for reuse), log an error for further investigation, and return a 500 Internal Server Error response to the client. If this happens, it suggests a problem - either with that particular query or your database or application more generally. When a query is taking a lot longer to complete than expected. Kitematic automates the Docker installation and setup process and provides an intuitive graphical user interface (GUI) for running Docker containers. So in this post I want to explain how to cancel database queries in a web application, what behavioral quirks and edge cases it is important to be aware of, and try to provide answers to the questions that you might have when working through all this.īut first off, why would you want to cancel a database query? Two scenarios spring to mind: especially if you are using this functionality in the context of a web application or API. ![]() Please remove the existing one and re-assign a new identity. But once you start digging into the details there's a lot a nuance and quite a few gotchas. The assigned managed identity cannot be used. On the face of it, using this functionality is quite straightforward (here's a basic example). One of the great features of Go is that it's possible to cancel database queries while they are still running via a context.Context instance (so long as cancellation is supported by your database driver).
0 Comments
Leave a Reply. |