potiuk commented on issue #4543: [AIRFLOW-3718] [WIP] Multi-layered version of the docker image URL: https://github.com/apache/airflow/pull/4543#issuecomment-469329592 @ashb @Fokko -> Yeah, I came back to work on it and I wanted to keep the PR open, but it is very much work in progress yet (I've changed WIP in the name to reflect that). I acccidentally pushed some of my WIP work from my own fork, but what I will do I will run a number of tests with this in my own fork/Travis/Cloud Build/DockerHub set so that I am sure it works as I expect it to. I will answer in moment especially with some of your questions where relevant and continue working on it. As one of you rightfully noticed before , cache invalidation is the second hardest thing in computer science, so I still have to fight a bit with how Docker behaves when builds are run on different machines (I am plannning to give a flash-talk about this :). I will explain a bit more when I test everything. DockerHub being super-slow does not help with that.
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