Substack iconSubstackSep 27, 2026 ~1 min source read

The Job Was Enqueued by Older Code

The code change looks straightforward: rename the file, update the callers, and fix the tests. A job enqueued before the deploy might wait hours or days before a worker picks it up.

The Job Was Enqueued by Older Code

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Useful takeaways from this story.

The code change looks straightforward: rename the file, update the callers, and fix the tests.

A job enqueued before the deploy might wait hours or days before a worker picks it up.

I wanted to follow that job through the rename and work out what the new release still needs to support.

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The useful part

The code change looks straightforward: rename the file, update the callers, and fix the tests. A job enqueued before the deploy might wait hours or days before a worker picks it up. I wanted to follow that job through the rename and work out what the new release still needs to support.

How it works

  • Suppose we rename FulfillOrderJob to DispatchOrderJob, update every call site, and deploy.

Details worth keeping

A job scheduled by the previous release still…

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