https://vubon.me/tags/high-availability/Recent content in High Availability on Vubon NotesHugoen-usFri, 08 May 2026 00:00:00 +0000https://vubon.me/posts/system-design-interview-partial-failure/Fri, 08 May 2026 00:00:00 +0000https://vubon.me/posts/system-design-interview-partial-failure/<p>After talking about idempotency, I thought I&rsquo;d share another good follow-up question:</p> <p><strong>&ldquo;What happens if your service crashes in the middle of a request?&rdquo;</strong></p> <p>Let&rsquo;s say:</p> <ul> <li>transfer record inserted ✅</li> <li>ledger update started ❌</li> <li>database connection drops</li> <li>service dies</li> </ul> <p>Now you have partial data.</p> <p>And in payment systems, partial success is usually worse than failure.</p> <p> <figure class=""> <div class="img-container"> <img loading="lazy" alt="What if your service crashes in the middle of a request?" src="https://vubon.me/images/partial-failure-durability.png"> </div> </figure> </p> <hr> <h2 class="heading" id="the-first-answer-most-people-give"> The first answer most people give <a class="anchor" href="#the-first-answer-most-people-give">#</a> </h2> <p>👉 <em>Use database transactions (ACID).</em></p>