github-actions[bot] opened a new pull request, #58947: URL: https://github.com/apache/airflow/pull/58947
With .pyc files removal after compilation we save very little space. Uncompressed sizes of regular airflow image are: Before 7.63GB After 7.66GB So we have images bigger by < 0.5% And it seems that long running containers without those files can suffer from continuous attempts to recreate the .pyc files that fail due to lack of permissions and cause negative dentries to be continuously created: https://lwn.net/Articles/814535/ Those negative dentries are created by kernel - caching the fact that a file was not available - which speeds up lookup but also takes a bit of memory. It seems that when compiled Python has the .pyc files removed, it tries to recreate them with timestamped entries every time new interpreter is started. While this is not a problem for long running processes - because those interpreters are run exactly once per container, this is a problem if you use `exec` in containers to run Health Checks. Evey health-check creates a new interpreter and every time it is created, a new negative dentries to take kernel memory. By not removing the .pyc files we increase a bit the size of the image but improve a little the startup time (no need to compile Python internal .py files, as well as get rid of the negative dentries problem. This PR likely: (cherry picked from commit bcda5080b8f3b43c63f2b6e5abd788efe5d58582) Co-authored-by: Jarek Potiuk <[email protected]> Fixes: #58509 Fixes: #42195 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
