https://hanh.me/tags/distributed-systems/Recent content in Distributed-Systems on Hanh Pham's BlogHugoen-usFri, 23 Oct 2026 09:53:53 +0700https://hanh.me/posts/what-died-when-deno-joined-cloudflare/Tue, 20 Oct 2026 09:00:00 +0700https://hanh.me/posts/what-died-when-deno-joined-cloudflare/Deno’s runtime got a twelve month clock and Deno Deploy got six months, but Deploy had already been shut down once in July, and the part of Deno that survived is the part nobody was arguing about.https://hanh.me/posts/the-renaissance-developer/Fri, 02 Oct 2026 10:00:00 +0700https://hanh.me/posts/the-renaissance-developer/When generative AI commoditizes syntax into zero-cost token emissions, the developer’s moat shifts from typing code to systems synthesis: understanding how a single concurrent change ripples across database row locks, cache lines, and cloud bills.https://hanh.me/posts/microservices-designing-an-order-workflow/Thu, 03 Sep 2026 09:30:00 +0700https://hanh.me/posts/microservices-designing-an-order-workflow/Boundaries, communication styles, technology, and sagas all sound reasonable in isolation. Here’s what it looks like to actually apply all four decisions to one real workflow, in order.https://hanh.me/posts/microservices-sagas-vs-two-phase-commit/Tue, 01 Sep 2026 10:00:00 +0700https://hanh.me/posts/microservices-sagas-vs-two-phase-commit/Splitting a monolith means splitting its database transactions too. The instinct is to reach for a distributed transaction. Here’s why that instinct is usually wrong, and what to do instead.https://hanh.me/posts/microservices-picking-communication-tech/Thu, 20 Aug 2026 09:30:00 +0700https://hanh.me/posts/microservices-picking-communication-tech/The communication style (sync/async, request-response/event-driven) narrows the field. Here’s how the actual technologies stack up once you’re choosing among them.https://hanh.me/posts/debugging-microservices-where-did-that-request-go/Sat, 15 Aug 2026 10:30:00 +0700https://hanh.me/posts/debugging-microservices-where-did-that-request-go/In a monolith, a stack trace tells you what went wrong. In microservices, you’re grepping across three services’ logs at 2 AM trying to figure out which one lost the request. Here’s how to make that possible instead of painful.https://hanh.me/posts/microservices-versioning-without-breaking-everyone/Thu, 13 Aug 2026 15:00:00 +0700https://hanh.me/posts/microservices-versioning-without-breaking-everyone/In a monolith, renaming a field means updating all callers in one commit. In microservices, consumers upgrade on their own schedule, so your API has to evolve without breaking the ones that haven’t upgraded yet. Here’s how.https://hanh.me/posts/microservices-local-dev-without-docker-compose-hell/Tue, 11 Aug 2026 10:00:00 +0700https://hanh.me/posts/microservices-local-dev-without-docker-compose-hell/You split the monolith into twelve services. Now a new developer’s first week is spent getting Docker Compose to run all twelve on their laptop, and half of them crash because of a port conflict. Here’s how to make local development work without the pain.https://hanh.me/posts/microservices-deploying-without-the-fear/Sat, 08 Aug 2026 14:00:00 +0700https://hanh.me/posts/microservices-deploying-without-the-fear/In a monolith, deploy means pushing one thing. In microservices, every service deploys independently, which is the whole point, until you realize that ‘independently’ also means ‘without knowing what the other services are doing right now.’https://hanh.me/posts/microservices-database-per-service/Thu, 06 Aug 2026 09:30:00 +0700https://hanh.me/posts/microservices-database-per-service/Each service owns its database. That’s the rule. But when a report needs data from four services, or a customer wants to see their complete order history, you’ve got a query problem that a single SELECT can’t solve. Here’s how to handle it.https://hanh.me/posts/microservices-service-mesh-when-you-actually-need-one/Tue, 04 Aug 2026 11:00:00 +0700https://hanh.me/posts/microservices-service-mesh-when-you-actually-need-one/A service mesh gives you mTLS, traffic management, and observability without changing application code. It also gives you another piece of infrastructure to operate, debug, and explain to new hires. Here’s how to tell whether the trade-off is worth it.https://hanh.me/posts/microservices-five-ways-to-talk/Thu, 30 Jul 2026 10:00:00 +0700https://hanh.me/posts/microservices-five-ways-to-talk/Before picking REST, gRPC, or Kafka, you need to answer a more basic question: does this interaction block, and does the caller expect an answer? Get that wrong and no technology choice saves you.https://hanh.me/posts/microservices-boundaries-coupling-cohesion/Tue, 28 Jul 2026 10:00:00 +0700https://hanh.me/posts/microservices-boundaries-coupling-cohesion/Before you draw a single service boundary, you need a vocabulary for why some splits age well and others turn into a distributed monolith. Coupling and cohesion are that vocabulary.https://hanh.me/posts/should-you-even-use-microservices/Sat, 25 Jul 2026 10:00:00 +0700https://hanh.me/posts/should-you-even-use-microservices/Microservices are a solution to organizational scaling problems, not a technology choice. Here’s how to tell whether you actually have the problem they solve, before you pay the cost.