potiuk opened a new pull request, #37360:
URL: https://github.com/apache/airflow/pull/37360
When regular dependencies change we enable UPGRADE_TO_NEWER_DEPENDENCIES
flag. After some recent improvements in installing dependencies from the branch
tip where we can install airflow using `[devel-ci]` extra from the branch tip,
this opens up another option for speeding up the installations, when some
dependencies change.
So far - UPGRADE_TO_NEWER_DEPENDENCIES necessitated to reinstall all
dependencies with airflow attempting to upgrade them eagerly. This takes ~ 28
minutes on CI now from the scratch. However, this is not needed. We can still
start from the set of dependencies pre-installed by installation from branch
tip, and only trigger
"UPGRADE_TO_NEWER_DEPENDENCIES" after that - so that the "URL" installation
cache does not get invalidated.
This should limit the time needed to build such an image to ~ 8 minutes in
CI when cache is built.
In the future we might further optimize it - as we now have all the
mechanisms necessary to do that in selective checks. For example we could
trigger UPGRADE_TO_NEWER_DEPENDENCIES only when some dependencies are changes,
and not when new dependencies are added, further limiting the time needed to
build such image to some ~ 3/4 minutes. But this should be a separate PR and
should be carefuly thought about, as it might also be that this will lead to
conflicts with the latest constraints..
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