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Warn that the in-process queue fails on Workers - #1437
InProcessMessageQueue is documented as a development queue, and neither manual says that it cannot run on Cloudflare Workers. A delayed enqueue() schedules setTimeout() and resolves immediately, so a Worker isolate can terminate before the message enters the queue. listen() only polls in-memory state, and each isolate has its own queue.
The warning is now in the InProcessMessageQueue section of docs/manual/mq.md and in the Cloudflare Workers section of docs/manual/deploy.md. Both point to WorkersMessageQueue with a queue() handler, or another durable queue. The Cloudflare Workers example already uses WorkersMessageQueue.
Copying InProcessMessageQueue into a Cloudflare Worker accepts activities that are never processed. The delayed enqueue uses a timer the isolate can terminate, and listen() only polls memory that does not survive between requests.
Document that limitation next to the queue and in the Workers deployment guide, and point readers to WorkersMessageQueue.
Changelog: none
No actionable comments were generated in the recent review.
Walkthrough
The message queue and deployment manuals now warn that InProcessMessageQueue is not reliable on Cloudflare Workers. They describe risks from delayed enqueues, polling, and isolate-local state, and recommend WorkersMessageQueue with a queue() handler or another durable queue.
Changes: Cloudflare Workers queue guidance
Layer / File(s)
Summary
Document queue limits and alternatives docs/manual/mq.md, docs/manual/deploy.md
Both sections explain that delayed work and in-memory polling may not persist across Cloudflare Workers requests or isolates. They recommend WorkersMessageQueue with a queue() handler or another durable queue.
This change only adds documentation warnings about using InProcessMessageQueue on Cloudflare Workers. It does not change runtime behavior, so merge risk is minimal.
Pre-merge checks: 3 · 1
Failed checks: 1 inconclusive
Check name
Status
Explanation
Resolution
Linked Issues check
Issue #1385 is the only active direct link. Its coding requirement is documentation: add a warning to two pages. (1) [#1385] docs/manual/mq.md, InProcessMessageQueue section: confirmed at the reviewed…
Provide readable evidence of the deploy.md Cloudflare Workers section at the reviewed head (for example, a narrower read of that section or a working diff for docs/manual/deploy.md). That evidence must show a warning that points Workers use…
Passed checks: 3 passed
Check name
Status
Explanation
Title check
The title states the main change: a warning that the in-process queue fails on Workers. The raw summary confirms the PR adds warnings to docs/manual/mq.md and docs/manual/deploy.md about InProcessMess…
Description check
The description explains the problem and the reason. It names the files changed (docs/manual/mq.md and docs/manual/deploy.md), the delayed enqueue() and setTimeout() behavior, the per-isolate queue is…
Out of Scope Changes check
The whole-PR summary (base dd42882 to head 886798a) lists two changed files: docs/manual/mq.md (+11/-0) and docs/manual/deploy.md (+8/-0). Both are documentation changes that the linked issue #1385 na…
Full details: Title check
Explanation
The title states the main change: a warning that the in-process queue fails on Workers. The raw summary confirms the PR adds warnings to docs/manual/mq.md and docs/manual/deploy.md about InProcessMessageQueue on Cloudflare Workers. The title is specific and concise.
Full details: Description check
Explanation
The description explains the problem and the reason. It names the files changed (docs/manual/mq.md and docs/manual/deploy.md), the delayed enqueue() and setTimeout() behavior, the per-isolate queue issue, and the recommended WorkersMessageQueue alternative. It also links the issue it fixes (#1385). This matches the changeset.
Full details: Out of Scope Changes check
Explanation
The whole-PR summary (base dd42882 to head 886798a) lists two changed files: docs/manual/mq.md (+11/-0) and docs/manual/deploy.md (+8/-0). Both are documentation changes that the linked issue #1385 names. The mq.md change is confirmed at the head and contains only the Workers warning in the InProcessMessageQueue section. The deploy.md change is described in the summary as a Workers warning that points to WorkersMessageQueue. Its content could not be read directly, so the description rests on the summary. The summary reports no changes to exported or public declarations and no code, configuration, or example changes. No unrelated change was found in the available evidence.
Full details: Linked Issues check
Explanation
Issue #1385 is the only active direct link. Its coding requirement is documentation: add a warning to two pages. (1) [#1385] docs/manual/mq.md, InProcessMessageQueue section: confirmed at the reviewed head (886798a). A WARNING callout states that InProcessMessageQueue cannot run on Cloudflare Workers. It explains that delayed enqueue() schedules setTimeout() and resolves immediately, that the isolate can terminate before the timer runs, and that listen() polls in-memory state that is not shared across requests. It directs readers to WorkersMessageQueue with a queue() handler or another durable queue, and says not to treat delayed enqueue as reliable on Workers. This meets the mq.md requirement. (2) [#1385] docs/manual/deploy.md, Cloudflare Workers section: not verified at the head. The file read succeeded but was truncated at 16000 bytes before the Cloudflare Workers section, and the diff tool could not read changed blobs. The PR description and the AI-generated summary state that the warning was added. The summary's line count for this file changed from +9 to +8 since the previous review, so the earlier pass for this file no longer rests on current evidence. The optional TypeError change in listen() is not in this PR and is not required by the issue. The check that no example pairs InProcessMessageQueue with Workers was not read directly; the PR description says the Workers example uses WorkersMessageQueue. Because the deploy.md requirement cannot be confirmed from source, the overall result is unknown.
Resolution
Provide readable evidence of the deploy.md Cloudflare Workers section at the reviewed head (for example, a narrower read of that section or a working diff for docs/manual/deploy.md). That evidence must show a warning that points Workers users to WorkersMessageQueue with a queue() handler or another durable queue, and must not present InProcessMessageQueue as usable on Workers.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @docs/manual/deploy.md:
- Around line 933-935: Update the deployment guidance around
`WorkersMessageQueue` to state that isolate memory is not guaranteed to survive
or be shared across requests, rather than claiming each request has a separate
queue. Correct the similar claim in the message-queue documentation, and retain
the recommendation to use `WorkersMessageQueue` with a `queue()` handler.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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Reviewing files that changed from the base of the PR and between dd42882 and 814290d.
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docs/manual/deploy.md
docs/manual/mq.md
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A Worker can reuse one isolate for a later request, so in-process queue memory is not guaranteed to disappear or to be shared. Say that instead of claiming the next request cannot see the message.
Changelog: none
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InProcessMessageQueueis documented as a development queue, and neither manual says that it cannot run on Cloudflare Workers. A delayedenqueue()schedulessetTimeout()and resolves immediately, so a Worker isolate can terminate before the message enters the queue.listen()only polls in-memory state, and each isolate has its own queue.The warning is now in the
InProcessMessageQueuesection of docs/manual/mq.md and in the Cloudflare Workers section of docs/manual/deploy.md. Both point toWorkersMessageQueuewith aqueue()handler, or another durable queue. The Cloudflare Workers example already usesWorkersMessageQueue.Fixes #1385