feat(perf-issues): Allow experimental N+1 DB Span detector to pick up MongoDB queries #90756
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leeandher
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Scope: Backend
leeandher
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May 1, 2025
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| def _contains_valid_repeating_query(self, span: Span) -> bool: | ||
| # Make sure we at least have a space, to exclude e.g. MongoDB and | ||
| # Prisma's `rawQuery`. | ||
| query = span.get("description", None) | ||
| return bool(query) and " " in query | ||
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So I took apart this function and moved it's check to the visit_span method via are_spans_equivalent.
| b_relay_description = b.get("sentry_tags", {}).get("description") | ||
| return a_relay_description == b_relay_description and base_checks | ||
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| return base_checks |
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Now, instead of just checking a.hash against b.hash we're also validating that the descriptions match, and aren't empty. These two checks used to only happen after the detector ran through, in _contains_valid_repeating_query and only for the first of the n_spans. Now we're checking every span against the previous explicitly.
For mongodb system spans we also check the relay descriptions which include collection names, for even more confidence.
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Allows the N+1 detector to operate on MongoDB queries. The example JSON comes from my prod trace that i generated from playing around with empowerplant. Tests work but maybe there's more coverage I should add but I'm not too sure.