re: Why you should deploy on Friday afternoon VIEW POST


I work at a company that has a CI/CD pipeline, we routinely deploy 10-20 times a day, including on Fridays...but we still say this occasionally. It's a matter of context. There are lots of deploys that we don't do on Fridays precisely because if it's that easy to deploy, what are the odds that you've got a critical yet risky change that a) didn't make it through your pipeline and b) must go out now, at Friday at 4pm?

If you went to an ER on a Friday afternoon and was turned away because the doctors don't trust their own tools and know-how, how would you feel?

I don't think this is the right analogy. How about:

If you went to an ER on a Friday afternoon, would you want to be seen by the surgeon who's finishing her shift of the one who's starting hers? Also, how would you feel about seeing the one who's finishing first, and having her hand you off to the one who's starting?

Before you answer, here are some scary numbers:

It's always a matter of context :)


I'd say that if the context of your deployment makes it risky, then it's a bit of a smell. I'd start trying to work out why it's risky to deploy this software, and how I can reduce that risk, rather than avoiding it.


Clearly changing a typo in a greeting message, or adding a single line of CSS to adjust a margin on something is always going to be less risky than an functional update that adds a new feature to a product/service. With all the best efforts to reduce the risk, there is always going to be a difference in risk level for any single piece of work, just like there are differences in the effort of work for any given user story. Taking this into account, deployments are always contextual, and like smells (code or otherwise), that's not necessarily a bad thing. It's just a single measure of risk, and something that shouldn't be taken in isolation.

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