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docs(ssr): explain why a finite gcTime keeps requests in memory on the server - #12589
The section "High memory consumption on the server" recommends a smaller gcTime as a solution. But any finite value schedules a timer on the server as well. In Node, a timer keeps the request's AsyncLocalStorage context alive until it finishes. Therefore, a smaller value may not necessarily fix the issue, just shorten it.
This PR:
explains why a finite gcTime retains requests on the server.
explains why the server needs a different treatment, that is, using environmentManager.isServer() to keep the server gcTimeInfinity.
removes the suggestion for adding a smaller gcTime
notes that queryClient.clear cancels pending GC timers.
Applied to the React, Preact, Vue and Solid SSR guides. The Solid one also had the server default backwards.
I have tested code changes locally with pnpm run test:pr, or these tests do not apply to this pull request.
I have followed the AI contribution policy and fully understand the code in this pull request, including any code generated with AI assistance.
🚀 Release Impact
This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).
Summary by CodeRabbit
Documentation
Updated server-side rendering guidance for Preact, React, Solid, and Vue to explain that finite cache times schedule timers that can retain Node.js request context in memory.
Clarified that server cache times default to infinity and that default cache-time settings apply on the server as well as in the browser.
Added examples for using different cache times on the server and in the browser, and cautions that short or zero server values can remove prefetched data before rendering or dehydration completes.
Advised clearing the query cache after queries settle when using finite server-side cache times.
…the server
Apply the same explanation to the React, Preact, Vue and Solid SSR guides,
and fix the Solid guide, which described the server default backwards.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
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Walkthrough
The Preact, React, Solid, and Vue SSR guides now describe server-side gcTime behavior, including finite-value timers and potential Node.js AsyncLocalStorage context retention. They show server and browser configuration examples and explain when to clear a QueryClient.
Changes: SSR gcTime guidance
Layer / File(s)
Summary
Document server gcTime behavior docs/framework/preact/guides/ssr.md, docs/framework/react/guides/ssr.md, docs/framework/solid/guides/ssr.md, docs/framework/vue/guides/ssr.md
The guides explain that server-side gcTime defaults to Infinity and that finite values schedule per-query timers. They describe possible AsyncLocalStorage context retention, show server and browser configuration examples, and advise clearing the QueryClient after queries settle when finite server-side gcTime is used.
The SSR guides now explain that a finite server gcTime can keep request context alive. They recommend Infinity on the server and say to clear the client only after queries settle. The concerns raised earlier have been addressed, and no merge-blocking risk remains for this documentation change.
Pre-merge checks: 4
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Explanation
Title check
The title "docs(ssr): explain why a finite gcTime keeps requests in memory on the server" names the main change. The four SSR guides (React, Preact, Vue, Solid) now explain that a finite server gcTime…
Description check
The description follows the template. It has a Changes section that explains the motivation, the fix, and the removal of the smaller-gcTime suggestion. It links related issue #11320 and includes the c…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Title check
Explanation
The title "docs(ssr): explain why a finite gcTime keeps requests in memory on the server" names the main change. The four SSR guides (React, Preact, Vue, Solid) now explain that a finite server gcTime schedules a timer that can retain AsyncLocalStorage request context. The title is specific and matches the changeset, though it does not mention the removed smaller-gcTime advice or the framework scope.
Full details: Description check
Explanation
The description follows the template. It has a Changes section that explains the motivation, the fix, and the removal of the smaller-gcTime suggestion. It links related issue #11320 and includes the checklist with boxes ticked. The Release Impact section marks the change as docs-only, which fits the changes. The description does not state the test run in detail, but the checklist covers it.
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Reviewing files that changed from the base of the PR and between 476c3c4 and 90d79e5.
Files selected for processing: 4
docs/framework/preact/guides/ssr.md
docs/framework/react/guides/ssr.md
docs/framework/solid/guides/ssr.md
docs/framework/vue/guides/ssr.md
Files skipped from review as they are similar to previous changes: 1
docs/framework/react/guides/ssr.md
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Actionable comments posted: 4
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @docs/framework/react/guides/ssr.md:
- Line 599: Update the finite `gcTime` guidance in the SSR section to remove the
claim that `2 * 1000` gives enough time; state that a query can be
garbage-collected before dehydration if it finishes while slower prefetches are
still running. Preserve the recommendation to use `Infinity` on the server.
- Line 601: Update the finite-gcTime guidance in the SSR guide to clarify that
queryClient.clear() cancels in-flight fetches, and that a pending fetch
schedules a new GC timer after settling. Instruct readers to wait for pending
fetches to settle before calling clear().
- Line 601: Clarify the `gcTime` cleanup guidance by naming whether it applies
to the loader-owned `queryClient` returned through `dehydrate(queryClient)` or
to the rendering client created in `_app.tsx` or `app/root.tsx`. For a
loader-owned client, identify a valid cleanup point within the loader before it
returns, or state that the guidance does not apply; do not imply cleanup can run
after the loader returns.
Review comments at @docs/framework/solid/guides/ssr.md:
- Line 228: Update the Solid SSR cleanup sentence around queryClient.clear() to
retain the finite server gcTime condition and describe clearing the cache and
its pending timer without tying cleanup to a dehydration milestone.
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Reviewing files that changed from the base of the PR and between 9b528b5 and 476c3c4.
Files selected for processing: 4
docs/framework/preact/guides/ssr.md
docs/framework/react/guides/ssr.md
docs/framework/solid/guides/ssr.md
docs/framework/vue/guides/ssr.md
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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🎯 Changes
Related to #11320 (see @slorber's comment: #11320 (comment))
The section "High memory consumption on the server" recommends a smaller
gcTimeas a solution. But any finite value schedules a timer on the server as well. In Node, a timer keeps the request'sAsyncLocalStoragecontext alive until it finishes. Therefore, a smaller value may not necessarily fix the issue, just shorten it.This PR:
gcTimeretains requests on the server.environmentManager.isServer()to keep the servergcTimeInfinity.gcTimequeryClient.clearcancels pending GC timers.Applied to the React, Preact, Vue and Solid SSR guides. The Solid one also had the server default backwards.
✅ Checklist
pnpm run test:pr, or these tests do not apply to this pull request.🚀 Release Impact
Summary by CodeRabbit