MediaWiki\Extension\WikiLambda\WikifunctionsClientStore::fetchFromFunctionCallCache cache miss while fetching {key}
Open, In Progress, MediumPublicPRODUCTION ERROR
Actions

Assigned To

Authored By

	Jdforrester-WMF
	Jul 9 2025, 3:28 PM

Project Tags

Referenced Files

None

Subscribers

DSantamaria

Jdforrester-WMF

Description

Error

mwversion: 1.45.0-wmf.9
timestamp: 2025-07-09T15:25:21.694Z
phpversion: 8.1.32
reqId: a3254ad2-d4dd-4cc8-bb99-391e358f7ac7
Find reqId in Logstash

normalized_message

MediaWiki\Extension\WikiLambda\WikifunctionsClientStore::fetchFromFunctionCallCache cache miss while fetching {key}

exception.trace

Impact

Notes

Details

Request URL: https://www.wikifunctions.org/w/index.php?direction=*&oldid=*&title=*&useparsoid=*

Related Changes in Gerrit:

	Subject	Author	Repo	Branch	Lines +/-
	WikifunctionsClientStore: Downgrade 'cache miss while fetching' logs	Jforrester	mediawiki/extensions/WikiLambda	master	+1 -1

Customize query in gerrit

Related Objects

Mentioned In: T396449: WikifunctionsPFragmentHandler::fetchFunctionFromCache cache miss while fetching Z20744 for empty argument Z20744K1
Mentioned Here: T431428: [Hypothesis] DE2.1.3 - Durable fragments
T432217: wikifunctions Memcached: High incidence of failures on MemcachedWrapper::set operations

Event Timeline

Jdforrester-WMF created this task.Jul 9 2025, 3:28 PM

Jdforrester-WMF mentioned this in T396449: WikifunctionsPFragmentHandler::fetchFunctionFromCache cache miss while fetching Z20744 for empty argument Z20744K1.

Jdforrester-WMF triaged this task as Medium priority.Jul 9 2025, 3:38 PM

Jdforrester-WMF moved this task from To Triage to Bugs to investigate on the Abstract Wikipedia team board.

• thcipriani moved this task from Untriaged to Jul–Sep 2025 on the Wikimedia-production-error board.Jul 29 2025, 6:44 PM

@Jdforrester-WMF, is this still happening in production?

In T399098#12220953, @DSantamaria wrote:

@Jdforrester-WMF, is this still happening in production?

Yes, approximately 60 times/hour.

Latest example: https://logstash.wikimedia.org/app/discover#/doc/logstash-*/logstash-mediawiki-1-7.0.0-1-2026.08.20?id=838EIKABTgJfwcuOe1l-

On reflection, we should downgrade these; some level of these is expected (reads before the job finishes and writes the value to the cache), and due to T432217: wikifunctions Memcached: High incidence of failures on MemcachedWrapper::set operations this might be slightly higher (~6%) than it should be; with T431428: [Hypothesis] DE2.1.3 - Durable fragments in general this code will be redone anyway.

Change #1327595 had a related patch set uploaded (by Jforrester; author: Jforrester):

[mediawiki/extensions/WikiLambda@master] WikifunctionsClientStore: Downgrade 'cache miss while fetching' logs

https://gerrit.wikimedia.org/r/1327595

gerritbot added a project: Patch-For-Review.Thu, Aug 20, 5:19 PM

Jdforrester-WMF changed the task status from Open to In Progress.Thu, Aug 20, 5:20 PM

Jdforrester-WMF claimed this task.

Jdforrester-WMF edited projects, added: Abstract Wikipedia team (27Q1 (Jul–Sep)); removed: Abstract Wikipedia team.

Jdforrester-WMF moved this task from Incoming to In Code review on the Abstract Wikipedia team (27Q1 (Jul–Sep)) board.

MediaWiki\Extension\WikiLambda\WikifunctionsClientStore::fetchFromFunctionCallCache cache miss while fetching {key}Open, In Progress, MediumPublicPRODUCTION ERRORActions