⚡ Bolt: Optimize sitemap generation with parallel data fetching#97
⚡ Bolt: Optimize sitemap generation with parallel data fetching#97
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Replaced the sequential `for...of` loop in `app/sitemap.ts` with parallel execution via `Promise.all`. This allows `getSpeakers` and `getTalks` to be fetched simultaneously for each year, greatly reducing overall sitemap build time. Handled error states gracefully for individual items using `.catch(() => [])`. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the performance of sitemap generation by transitioning from a sequential data fetching model to a parallelized approach. By leveraging Promise.all, the system now fetches speaker and talk data concurrently across different years, thereby eliminating bottlenecks caused by an API waterfall and drastically reducing build and Incremental Static Regeneration (ISR) times for the sitemap. Highlights
Changelog
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Pro Run ID: 📒 Files selected for processing (1)
📝 WalkthroughWalkthroughSitemap generation in Changes
Sequence Diagram(s)sequenceDiagram
rect rgba(240,248,255,0.5)
participant Sitemap as app/sitemap.ts
participant Speakers as getSpeakers(year)
participant Talks as getTalks(year)
participant Jobs as getJobOffers(year)
participant Builder as URL Builder
participant Output as Sitemap Array
end
Sitemap->>Speakers: request speakers for year (concurrent)
par Parallel fetches
Sitemap->>Talks: request talks for year (concurrent)
Sitemap->>Jobs: request job-offers for year (concurrent)
end
Speakers-->>Sitemap: speakers[] or []
Talks-->>Sitemap: talks/sessionGroups[] or []
Jobs-->>Sitemap: jobOffers[] or []
Sitemap->>Builder: build per-year URLs (pages + per-item routes)
Builder-->>Output: per-year URL list
Sitemap->>Output: concatenate all per-year lists -> return sitemap
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~22 minutes Possibly related PRs
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🚥 Pre-merge checks | ✅ 2 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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🧪 Generate unit tests (beta)
📝 Coding Plan
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Review Summary by QodoOptimize sitemap generation with parallel data fetching
WalkthroughsDescription• Parallelize data fetching for speakers and talks using Promise.all • Replace sequential for...of loop with concurrent year processing • Add error handling with .catch() for individual data fetch failures • Reduce sitemap generation time by eliminating API waterfall pattern Diagramflowchart LR
A["Sequential for...of loop<br/>year by year"] -->|"Refactored to"| B["Promise.all<br/>parallel years"]
B --> C["getSpeakers & getTalks<br/>concurrent per year"]
C --> D["Error handling<br/>with .catch"]
D --> E["Faster sitemap<br/>generation"]
File Changes1. app/sitemap.ts
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Code Review by Qodo
1. Unbounded fetch concurrency
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Code Review
This pull request significantly improves the performance of sitemap generation by replacing sequential, year-by-year data fetching with parallel processing using Promise.all. The implementation is clean, effective, and includes robust error handling with .catch() to prevent single failures from breaking the entire process. This is an excellent optimization that will noticeably reduce build times. I have one minor suggestion to further enhance consistency and performance.
| urls.push({ | ||
| url: `${baseUrl}/${year}/${page}`, | ||
| url: `${baseUrl}/${year}`, | ||
| lastModified: new Date(), |
There was a problem hiding this comment.
For consistency and a minor performance improvement, consider creating a single Date object at the start of the sitemap function (e.g., const now = new Date();) and reusing it for all lastModified properties. This ensures all URLs generated in this run have the same timestamp and avoids creating unnecessary Date objects inside loops.
Replaced the sequential `for...of` loop in `app/sitemap.ts` with parallel execution via `Promise.all`. This allows `getSpeakers` and `getTalks` to be fetched simultaneously for each year, greatly reducing overall sitemap build time. Handled error states gracefully for individual items using `.catch(() => [])`. Fixed prettier formatting issues. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
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Actionable comments posted: 1
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
app/sitemap.ts (1)
1-92:⚠️ Potential issue | 🟡 MinorFix Prettier formatting to resolve CI failure.
The pipeline is failing due to Prettier formatting issues. Run
prettier --write app/sitemap.tsto fix the code style.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@app/sitemap.ts` around lines 1 - 92, Prettier formatting errors in app/sitemap.ts are causing CI to fail; run prettier --write on the file (or format it in your editor) and commit the changes so the exported async function sitemap, import list (getJobOffersByYear, getAvailableEditions, getSpeakers, getTalks, slugify) and all object literals/arrays conform to the project's Prettier rules; after formatting, re-run the CI/lint step to ensure no remaining style issues before pushing.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@app/sitemap.ts`:
- Around line 52-55: The Promise.all catch handlers silently swallow errors when
calling getSpeakers(year) and getTalks(year); update the .catch handlers on the
Promise.all input (the entries for getSpeakers and getTalks) to accept an error
parameter and log it (using the project's logger, e.g., processLogger.error or
console.error) before returning the fallback []; ensure you reference
getSpeakers and getTalks in sitemap.ts so failures are logged with context like
"getSpeakers failed" / "getTalks failed" and still return [] to preserve
behavior.
---
Outside diff comments:
In `@app/sitemap.ts`:
- Around line 1-92: Prettier formatting errors in app/sitemap.ts are causing CI
to fail; run prettier --write on the file (or format it in your editor) and
commit the changes so the exported async function sitemap, import list
(getJobOffersByYear, getAvailableEditions, getSpeakers, getTalks, slugify) and
all object literals/arrays conform to the project's Prettier rules; after
formatting, re-run the CI/lint step to ensure no remaining style issues before
pushing.
app/sitemap.ts
Outdated
| const [speakers, sessionGroups] = await Promise.all([ | ||
| getSpeakers(year).catch(() => []), | ||
| getTalks(year).catch(() => []) | ||
| ]); |
There was a problem hiding this comment.
Add error logging to catch handlers.
The .catch(() => []) handlers silently swallow errors without logging, violating the coding guideline that prohibits generic catch-all statements without proper error handling.
While the underlying getSpeakers and getTalks functions already log errors internally, unexpected rejection reasons could still be silently lost here.
Suggested fix
const [speakers, sessionGroups] = await Promise.all([
- getSpeakers(year).catch(() => []),
- getTalks(year).catch(() => [])
+ getSpeakers(year).catch((error) => {
+ console.error(`Failed to fetch speakers for sitemap (year ${year}):`, error);
+ return [];
+ }),
+ getTalks(year).catch((error) => {
+ console.error(`Failed to fetch talks for sitemap (year ${year}):`, error);
+ return [];
+ })
]);As per coding guidelines: "Avoid unhandled promise rejections. Do not use generic catch-all statements without logging or handling the error properly."
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const [speakers, sessionGroups] = await Promise.all([ | |
| getSpeakers(year).catch(() => []), | |
| getTalks(year).catch(() => []) | |
| ]); | |
| const [speakers, sessionGroups] = await Promise.all([ | |
| getSpeakers(year).catch((error) => { | |
| console.error(`Failed to fetch speakers for sitemap (year ${year}):`, error); | |
| return []; | |
| }), | |
| getTalks(year).catch((error) => { | |
| console.error(`Failed to fetch talks for sitemap (year ${year}):`, error); | |
| return []; | |
| }) | |
| ]); |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@app/sitemap.ts` around lines 52 - 55, The Promise.all catch handlers silently
swallow errors when calling getSpeakers(year) and getTalks(year); update the
.catch handlers on the Promise.all input (the entries for getSpeakers and
getTalks) to accept an error parameter and log it (using the project's logger,
e.g., processLogger.error or console.error) before returning the fallback [];
ensure you reference getSpeakers and getTalks in sitemap.ts so failures are
logged with context like "getSpeakers failed" / "getTalks failed" and still
return [] to preserve behavior.
1 participant
💡 What:
Replaced sequential data fetching (
getSpeakersandgetTalks) inside afor...ofloop with a mapping that usesPromise.allto fetch data concurrently.🎯 Why:
The previous implementation fetched data year-by-year, and sequentially within each year. This created a massive API waterfall that drastically increased sitemap generation time as the number of years and sessions grew. By parallelizing the fetches, the sitemap generated much faster.
📊 Impact:
Eliminates sequential requests overhead for
Nyears and2main data calls per year. The sitemap generation is now limited only by the slowest single request, drastically reducing Next.js build and ISR time.🔬 Measurement:
Run
npm run buildand observe the reduced build time for thesitemap.xmlstatic page generation. All URLs should be correctly populated as before.PR created automatically by Jules for task 17970766081438447557 started by @anyulled
Summary by CodeRabbit