opensafely-core / opensafely-core/opencodelists
Bug report: Cloning large codelists fails
Nobody has claimed this yet.
- Dominant language
- Python
- Stars
- 60
- Forks
- 16
- Avg merge
- 4d 12h
- Merged PRs (30d)
- 17
Description
Summary
Cloning large and/or complex CodelistVersions fails
What did you do and what did you expect to happen?
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Opened https://www.opencodelists.org/codelist/opensafely/migration-status/4095ab22/
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Clicked "Clone this codelist"
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Expected a clone of this codelist to appear in the list of my codelists
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After a long delay an internal server error was returned
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Running locally with a recent database backup, the process does complete but takes ~180s
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This is a large codelist (~7500 codes) with many very broad and overlapping searches and thus many inclusion/exclusion decisions associated with it
Impact of the bug
User reported on Slack
Can workaround for now.
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the clone from the migration-status codelist URL, using a recent database backup locally, and inspect the linked Sentry error for the failing request. Trace the clone operation for large, complex CodelistVersions with many searches and inclusion/exclusion decisions. Done means the reported codelist clones successfully without an internal server error and without the roughly 180-second delay.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100