feat: [performance improvement] Parallelize data fetching in talks generateStaticParams#252
feat: [performance improvement] Parallelize data fetching in talks generateStaticParams#252anyulled wants to merge 2 commits into
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…nerateStaticParams Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Review Summary by QodoParallelize data fetching in talks generateStaticParams
WalkthroughsDescription• Parallelize concurrent data fetching in generateStaticParams • Replace sequential for...of loop with Promise.all • Reduce build time from O(N) sequential to concurrent execution • Document performance learning and best practices Diagramflowchart LR
A["Sequential for...of loop"] -->|"getTalks awaits block"| B["O(N) build time"]
C["Promise.all with map"] -->|"concurrent fetches"| D["Optimized build time"]
B -->|"refactored to"| D
File Changes1. .jules/bolt.md
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Code Review by Qodo🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)
Great, no issues found!Qodo reviewed your code and found no material issues that require review |
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Code Review
This pull request parallelizes the data fetching inside generateStaticParams using Promise.all to improve build performance, and documents this practice in .jules/bolt.md. Feedback highlights that swallowing errors with a try/catch block during build-time data fetching violates the rule of using strict mode to fail the build on failures. Both the implementation and the documentation should be updated to enforce strict mode and prevent silent build successes with incomplete data.
| years.map(async (year) => { | ||
| try { | ||
| const sessionGroups = await getTalks(year); | ||
| const allTalks = sessionGroups.flatMap((group) => group.sessions); | ||
| return allTalks.map((talk) => ({ year, talkId: talk.id })); | ||
| } catch (error) { | ||
| console.warn(`Failed to fetch talks for year ${year}:`, error); | ||
| return []; | ||
| } | ||
| } catch (error) { | ||
| console.warn(`Failed to fetch talks for year ${year}:`, error); | ||
| } | ||
| } | ||
| }) |
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According to the repository's general rules, data fetching functions used during the build process (such as generateStaticParams) should run in strict mode. This ensures that any data fetching failure correctly halts the build, preventing the deployment of incomplete pages with missing talks. Swallowing the error and returning an empty array allows the build to succeed silently with incomplete data.
years.map(async (year) => {
const sessionGroups = await getTalks(year, { strict: true });
const allTalks = sessionGroups.flatMap((group) => group.sessions);
return allTalks.map((talk) => ({ year, talkId: talk.id }));
})
References
- Data fetching functions used during the build process (e.g., for sitemap generation) should include a 'strict' mode that throws an error on failure. This ensures that data fetching problems cause the build to fail, preventing the deployment of incomplete pages.
| ## 2024-05-19 - Parallelize next build generateStaticParams | ||
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| **Learning:** When `generateStaticParams` uses a sequential `for...of` loop to iterate over multiple parameters (like event years) and fetches external data, it forces Next.js to wait sequentially for each fetch to finish before starting the next. This creates a significant, O(N) performance bottleneck during the build step. | ||
| **Action:** Replace sequential `for...of` loops with `await Promise.all(items.map(async (item) => { ... }))`. By mapping each item into an async data-fetching promise, Next.js executes the requests concurrently, resulting in significantly faster build times. Always make sure to preserve per-item `try/catch` fallbacks to avoid failing the entire batch if a single item errors. |
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The recommendation to 'always preserve per-item try/catch fallbacks to avoid failing the entire batch' contradicts the repository's general rule. For build-time data fetching, we want failures to halt the build so we do not deploy incomplete pages. Please update this documentation to recommend using strict mode for build-time data fetching.
References
- Data fetching functions used during the build process (e.g., for sitemap generation) should include a 'strict' mode that throws an error on failure. This ensures that data fetching problems cause the build to fail, preventing the deployment of incomplete pages.
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Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
.jules/bolt.md (1)
1-9:⚠️ Potential issue | 🟡 Minor | ⚡ Quick winAddress the Prettier formatting issue.
The CI pipeline flagged formatting issues in this file. Run
prettier --write .jules/bolt.mdto resolve.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In @.jules/bolt.md around lines 1 - 9, Run Prettier to fix the formatting of the markdown file flagged by CI: format ".jules/bolt.md" using your project's formatter (e.g., run prettier --write .jules/bolt.md or the repo's format script), verify the file format changes, and commit the updated file so the pipeline passes.
🧹 Nitpick comments (1)
app/[year]/talks/[talkId]/page.tsx (1)
33-44: Consider monitoring concurrent fetch behavior.The refactor correctly parallelizes fetching across all archived years, but if
getArchivedEditions()returns a large number of years, the concurrentPromise.allmay send many simultaneous requests to the external service. Depending on the service's rate limits or capacity, you may want to:
- Monitor build logs for rate-limit errors
- Consider batching with a concurrency limit (e.g., using
Promise.allon chunks) if issues arise- Verify that the external service can handle the concurrent load during builds
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@app/`[year]/talks/[talkId]/page.tsx around lines 33 - 44, The current nestedParams assembly uses Promise.all over years which may issue many simultaneous requests; limit concurrency by replacing the direct Promise.all(years.map(...)) pattern used around getTalks with a batched or throttled approach (e.g., process years in chunks or use a concurrency-limited runner) so nestedParams computation still maps year -> ({ year, talkId }) but only runs a bounded number of getTalks calls in parallel; update the block that defines nestedParams and the inner async mapping (references: nestedParams, years, getTalks, sessionGroups, allTalks) to implement batching or a concurrency limiter and keep the existing error handling for each year.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Outside diff comments:
In @.jules/bolt.md:
- Around line 1-9: Run Prettier to fix the formatting of the markdown file
flagged by CI: format ".jules/bolt.md" using your project's formatter (e.g., run
prettier --write .jules/bolt.md or the repo's format script), verify the file
format changes, and commit the updated file so the pipeline passes.
---
Nitpick comments:
In `@app/`[year]/talks/[talkId]/page.tsx:
- Around line 33-44: The current nestedParams assembly uses Promise.all over
years which may issue many simultaneous requests; limit concurrency by replacing
the direct Promise.all(years.map(...)) pattern used around getTalks with a
batched or throttled approach (e.g., process years in chunks or use a
concurrency-limited runner) so nestedParams computation still maps year -> ({
year, talkId }) but only runs a bounded number of getTalks calls in parallel;
update the block that defines nestedParams and the inner async mapping
(references: nestedParams, years, getTalks, sessionGroups, allTalks) to
implement batching or a concurrency limiter and keep the existing error handling
for each year.
ℹ️ Review info
⚙️ Run configuration
Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
Run ID: edccba87-92ba-4b2b-867d-588d8526f00d
📒 Files selected for processing (2)
.jules/bolt.mdapp/[year]/talks/[talkId]/page.tsx
…nerateStaticParams Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
1 participant
💡 What: Replaced sequential loop with
Promise.all+Array.mapto fetchgetTalksconcurrently.🎯 Why: Sequential awaits block data fetching across years, unnecessarily increasing build time.
📊 Impact: O(N) reduction in build time blockages for this route (relative to number of editions).
🔬 Measurement: Observe improved
next buildstatic page generation times for/[year]/talks/[talkId].PR created automatically by Jules for task 13649902803938676347 started by @anyulled
Summary by CodeRabbit
Documentation
Performance