The race condition a stress test found in my double-entry ledger — and how I fixed it
A developer encountered a race condition in their double-entry ledger system during stress testing. The issue arose when multiple transactions attempted to read and write the same account balance simultaneously, leading to incorrect balance updates. The developer implemented optimistic locking to resolve the issue and ensure accurate accounting.
- ▪The developer built a double-entry e-wallet ledger using Java, Spring Boot, and PostgreSQL.
- ▪A stress test revealed a race condition where concurrent transactions could lead to lost updates in account balances.
- ▪The solution involved using optimistic locking to prevent incorrect balance calculations during simultaneous transactions.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 1027650) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Do Pham Dinh Posted on May 24 • Originally published at github.com The race condition a stress test found in my double-entry ledger — and how I fixed it #java #springboot #postgres #concurrency I'm building ledger-service, a double-entry e-wallet ledger in Java 21 / Spring Boot 3.5 / PostgreSQL. It's live on Render. Early on I wrote a stress test that fires 50 transfers at the same account at once and asserts the books are never corrupted.
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