#24366: Improve migration dependency graph speed
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Reporter: MarkusH | Owner: knbk
Type: Cleanup/optimization | Status: assigned
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by knbk):
* owner: nobody => knbk
* status: new => assigned
Comment:
Preliminary results: from 25 minutes to 2 seconds with an implementation
based on a `Node` class and a recursive, cached `get_ancestors()` method.
The order isn't the exact same, but the following holds true:
{{{
for i, node in enumerate(ancestors):
assert all(ancestors.index(p) < i for p in node.parents)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/24366#comment:3>
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