Maniphest T403669

Rust evaluator messaging protocol should handle arbitrary buffer sizes
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	cmassaro
	Sep 3 2025, 8:55 PM

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Description

Description

Currently, the evaluator caps out at 1024 bytes, which is not even close to enough. The culprits are ChanneledReader and ChanneledWriter, which return after a single buffered call.

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

handle larger buffers

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

Related Objects
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		Status	Subtype	Assigned	Task
		Open		Jdforrester-WMF	T402957 [26Q2] Rust evaluator in production
		Open		None	T404014 [Q2 Rust Integration] Ensure that Rust evaluator meets resource and performance requirements
		Open		None	T403669 Rust evaluator messaging protocol should handle arbitrary buffer sizes
		In Progress		cmassaro	T388981 In our Rust POC of the function-evaluator, switch from wasi-common to wasmtime-wasi and upgrade wasmtime to 21.0.2+ (or replace)
		Resolved		cmassaro	T405130 Abandon Avro serialization; use the raw JSON request format and, optionally, compression

Event Timeline

cmassaro created this task.Sep 3 2025, 8:55 PM

cmassaro added a parent task: T399344: Rust-based evaluator is at feature parity with the current Node-based one.

Jdforrester-WMF changed the task status from Open to In Progress.Sep 10 2025, 3:33 PM

Jdforrester-WMF triaged this task as High priority.

Jdforrester-WMF edited projects, added Abstract Wikipedia team (26Q1 (Jul–Sep)), Essential-Work; removed Abstract Wikipedia team.

Jdforrester-WMF moved this task from Incoming to In Engineering on the Abstract Wikipedia team (26Q1 (Jul–Sep)) board.

cmassaro removed cmassaro as the assignee of this task.Sep 22 2025, 7:40 PM

cmassaro moved this task from In Engineering to Ready on the Abstract Wikipedia team (26Q1 (Jul–Sep)) board.

cmassaro added a subtask: T388981: In our Rust POC of the function-evaluator, switch from wasi-common to wasmtime-wasi and upgrade wasmtime to 21.0.2+ (or replace).Sep 23 2025, 3:04 AM

Jdforrester-WMF edited parent tasks, added: T404014: [Q2 Rust Integration] Ensure that Rust evaluator meets resource and performance requirements; removed: T399344: Rust-based evaluator is at feature parity with the current Node-based one.Sep 23 2025, 4:00 PM

Jdforrester-WMF edited projects, added Abstract Wikipedia team (26Q2 (Oct–Dec)); removed Abstract Wikipedia team (26Q1 (Jul–Sep)).

Jdforrester-WMF added a subtask: T405130: Abandon Avro serialization; use the raw JSON request format and, optionally, compression.Sep 24 2025, 5:38 PM

cmassaro closed subtask T405130: Abandon Avro serialization; use the raw JSON request format and, optionally, compression as Resolved.Oct 15 2025, 9:55 PM

Jdforrester-WMF moved this task from Incoming to Ready on the Abstract Wikipedia team (26Q2 (Oct–Dec)) board.Oct 16 2025, 2:07 PM

DSantamaria changed the task status from In Progress to Open.Nov 12 2025, 7:02 AM