d9ac4c18b1
Zuul mergers create a vast number of git references under /refs/zuul which are never garbage collected. With hundred of thousands of references, that makes git fetch operations very slow since git uploads all references to Gerrit to synchronize the Zuul maintained repository. On one of Wikimedia busy repository (mediawiki/core) we had 55000 such references and it can take up to 18 seconds for a fetch to complete. I have seen occurences of a merge taking 2 minutes to complete. As such, this tiny script clears out references for which the commit date of the pointed commit object is older than 360 days (the default). It is not perfect since a recent reference can well point to an old object. That would be the case on repositories that are barely active. In such case the ref will be gone despite it being recently created. A better way would be to vary Zuul references by using month/day which will let one easily garbage collect them. But I am being lazy and that would not let us clear out references using the current scheme. Example usage: zuul-clear-refs.py --verbose --dry-run --until 90 /srv/zuul/git/project Would show a list of references pointing to commit dates older than 90 days and output a message whenever the script would delete them. Hint about the utility in our merger documentation. Reference: https://phabricator.wikimedia.org/T70481 Change-Id: Id4e55f5d571ebd5e8271e516f53f8e05c1f78c1a
Zuul
Zuul is a trunk gating system developed for the OpenStack Project.
Contributing
To browse the latest code, see: https://git.openstack.org/cgit/openstack-infra/zuul/tree/ To clone the latest code, use git clone git://git.openstack.org/openstack-infra/zuul
Bugs are handled at: https://storyboard.openstack.org/#!/project/679
Code reviews are, as you might expect, handled by gerrit. The gerrit they use is http://review.openstack.org
Use git review to submit patches (after creating a gerrit account that links to your launchpad account). Example:
# Do your commits
$ git review
# Enter your username if prompted