Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.2.4, 3.3.1, 3.4
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Component/s: Caching
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Labels:
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Testing Instructions:
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Affected Branches:MOODLE_31_STABLE, MOODLE_32_STABLE, MOODLE_33_STABLE, MOODLE_34_STABLE
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Fixed Branches:MOODLE_33_STABLE, MOODLE_34_STABLE
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Pull from Repository:
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Pull Master Branch:
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Pull Master Diff URL:
Description
We recently had an issue with a client where students were getting booted out of the LMS and getting a "Exception - Redis went away" error especially when doing quizzes affecting about less than 0.0001% of requests. We narrowed it down to a potential edge case bug in the phpredis module detailed here.
A potential workaround is just to have the session retry the connection and that seems to work within the first retry (confirmed with unit tests).
Attachments
Issue Links
- caused a regression
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MDL-65249 Redis: exception being silenced after connection retries
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- Closed
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