Written on 21 Dec 2020
Configuring Datasette timeout options on Heroku
It isn't hard to configure, but I spent more than 15 minutes searching and fiddling so here is the blog post I wish I had come across.
Datasette is great software and is easy to use. It lets me can focus on building up a database and gives me a searchable web UI and an API for my data. But the defaults aren't always sufficient for deploying to Heroku. For example, I ran into an SQL timeout error pretty quickly.
I'm using datasette for the California municipal campaign finance project and was saw the timeout errors when I was just sorting some columns. So I wanted to up the timeout limit from the default of 1 second to 4 seconds.
Why 4 seconds? 🤷♂️ It's more than 1 and less than a lot?
The documentation is very clear about how to do this when running
datasette mydatabase.db --setting sql_time_limit_ms 4000
The documentation is less clear about how you might combine that setting with the
datasette publish command so that the timeout takes effect on Heroku. Turns out the winning combination is the
--extra-options flag with a quoted
I successfully increased the timeout on Heroku with:
datasette publish heroku \ --name $HEROKU_APP_NAME \ --extra-options \"--setting sql_time_limit_ms 4000\" \ mydatabase.db