Address error handling in composition language V2
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	cmassaro
	Jan 6 2026, 12:13 AM

Description

Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)

how much needs to change?
can we create proper stack traces?

Completion checklist

Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	wikifunctions: Upgrade orchestrator from 2026-01-28-071101 to 2026-02-11-121010	operations/deployment-charts	master	+1 -1

Customize query in gerrit

Related Objects
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Status	Assigned	Task
Open	cmassaro	T412953 Create a composition interpreter to improve performance
Open	None	T413727 Validate and Productionize /v2/evaluate
Open	None	T413729 Ensure that all current unit tests pass with the new /v2/evaluate
Open	cmassaro	T413839 Address error handling in composition language V2

Event Timeline

cmassaro created this task.Jan 6 2026, 12:13 AM

cmassaro added a parent task: T413729: Ensure that all current unit tests pass with the new /v2/evaluate.

Jdforrester-WMF edited projects, added Abstract Wikipedia team (26Q3 (Jan–Mar)), OKR-Work; removed Abstract Wikipedia team.Jan 7 2026, 6:40 PM

Jdforrester-WMF moved this task from Incoming to Ready on the Abstract Wikipedia team (26Q3 (Jan–Mar)) board.Jan 7 2026, 6:48 PM

DSantamaria triaged this task as High priority.Jan 8 2026, 3:15 PM

cmassaro claimed this task.Wed, Jan 21, 1:19 PM

cmassaro moved this task from Ready to In Engineering on the Abstract Wikipedia team (26Q3 (Jan–Mar)) board.Thu, Feb 5, 9:22 PM

apine opened https://gitlab.wikimedia.org/repos/abstract-wiki/wikifunctions/function-orchestrator/-/merge_requests/542

Throw errors in order to inject Z5s into the Z22K2 metadata map.

jforrester merged https://gitlab.wikimedia.org/repos/abstract-wiki/wikifunctions/function-orchestrator/-/merge_requests/542

Throw errors in order to inject Z5s into the Z22K2 metadata map.

Maintenance_bot removed a project: Patch-For-Review.Fri, Feb 6, 3:31 PM

Because we've now split the treatment of errors from other metadata, we will have to decide what to do about the metadata-manipulating builtin functions.

Options:

have all implementation types merge metadata the way that CodeImpl does;
have the metadata-manipulating functions include special treatment for the errors key.