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Discussion on: Our experience: Monorepo with Java, Maven and GitHub Actions, including basic example

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Kenneth Gunnerud Author • Edited

Good question, nothing :O. We usually made 1 change in every app we wanted to update. This was due to sometimes, we wanted a more controlled rollout. For example: app1 is critical, app2 was not, then we made a change (usually in a file called buildtrigger) in app2 that was rolled out in test and production, if all went well, we changed a line in buildtrigger for app1 as well.

For all practical purposes, we usually deployed 10 of the non critical apps on a dependency upgrade, if that went fine, we deployed the rest that was customer facing. But guess this depends on your requirements.
Another thing we also did sometimes, was create a new branch to deploy everything to dev, e.g.: dev/dependency-upgrades which triggered build and deploys only to dev environments. This worked due to a condition on prod deploy (only deploy master to prod). Then we deployed all the apps (including critical ones). If that went fine, we merged to master which re-triggered a deploy to dev + prod (so dev got 2x deploys in our case, one from branch dev/* and one from master). When we merged to master, we usually squashed since sometimes, we ended with some commits to fix some errors that occurred when updating.

One option, would be to create a workflow for root maven pom file that again uses github action workflow or repository dispatch to trigger the individual workflows.

Since we used a lot of spring boot, the dependency updates was not that frequent that it was a big problem for us, but as the project expands to more than our size I can see that alternatives to our solution is wanted.