Social Media Ideas for Concurrency

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javacodegeeks.com /1 week ago

Structured Concurrency: Why JEP 505 Changes How We Think About Cancellation, Not Just Syntax

A request comes in. Your service forks two calls, one for the user and one for their orders. The user lookup fails after a few milliseconds. Your handler catches the exception, ret...

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javacodegeeks.com /2 weeks ago

Structured Concurrency in Practice: ExecutorService vs StructuredTaskScope

Most Java concurrency bugs show up when something goes wrong, not when everything works. So let’s break one subtask on purpose and watch what each approach does about it. A Quick S...

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dzone.com /4 days ago

Java Virtual Threads Under Load: Three Production Limits

Virtual threads let us keep ordinary blocking code while many more requests wait concurrently. Under load, however, that brings three critical questions into focus: How much work...

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habr.com /1 week ago

Как не списать дважды за одну кнопку

Между нажатием кнопки и результатом у нас проходит от трёх до шестидесяти секунд: очередь, воркер, внешний API, иногда таймаут. А снаружи — пользователь, у которого на счету ровно...

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railsrevelry.substack.com /1 month ago

The Race Your Rails Validation Cannot Prevent

Originally appeared on Rails Revelry.Two Puma workers try to assign the same user to the same customer account.One request comes from an administrator. The other comes from an invi...

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dzone.com /2 weeks ago

Beyond @Transactional: Solving the Dual-Write Problem in Distributed Microservices

The Illusion of a Single Database In a traditional monolithic application, maintaining data consistency is straightforward. If you need to create a new order and update warehouse i...

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dzone.com /2 days ago

Idempotency Under Concurrency: Why Your Application Check Isn't the Last Line of Defense

Every Kafka tutorial covers idempotency the same way: "Store the event ID. Before processing, check if it exists. If it does, skip. Done."

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hook-dev-alter.com /4 weeks ago

HOOK_DEV_ALTER(): PHP Structured Concurrency and Beyond (3): structured state, and why its absence breaks concurrency

Every framework service that holds state is a bug under fibers. The current fix is to switch concurrency off. There is a third option.

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hook-dev-alter.com /4 weeks ago

HOOK_DEV_ALTER(): PHP Structured Concurrency and Beyond (2): ownership, and why its absence breaks persistent servers

A coroutine nobody owns is a leak. Under one process per request you never see it. Persistent servers take that away.

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javacodegeeks.com /1 month ago

Delta-State CRDTs: Solving the Bandwidth Problem Coordination-Free Replication Creates

CRDTs let replicas merge concurrent edits without coordination. The catch is what it costs to keep them talking to each other, and how delta-state CRDTs quietly fix it. Coordinatio...

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javacodegeeks.com /3 weeks ago

Durable Execution You Can Watch, Without a Workflow Engine

A background job charges a customer’s card on step three of four, then throws an exception on step four. The scheduler does what schedulers do and retries the whole job. Step three...

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habr.com /2 weeks ago

Таймаут в секунду, запрос на 43 секунды: пять ловушек PgBouncer в режиме транзакций

В настройках клиента базы стоял statement_timeout в одну секунду, а запрос выполнялся больше сорока. Таймаут выглядел включённым и не действовал. У этой поломки нашлись четыре родс...

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dzone.com /1 week ago

Going All In On the JVM 25 Virtual Threads

The project AngularAndSpring has been refactored from Spring Reactor to Spring blocking APIs using JDK 25 and virtual threads. The Old Architecture The reason AngularAndSpring was...

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dev.to /2 weeks ago

Propagating Deadlines from VIN Form Submit to NHTSA Proxy Without Orphaned Work

A free VIN form that abandons a slow decode still often leaves a DecodeVinValues call running behind the proxy. The user navigated away, a client timeout fired, or a newer submit s...

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aws.amazon.com /1 month ago

Building async Python applications with Tortoise ORM and Amazon Aurora DSQL

Build a high-concurrency async Python rideshare application with Tortoise ORM and Amazon Aurora DSQL. This post walks through the key adaptations: UUID primary keys, IAM-authentica...

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dzone.com /1 month ago

Architecting for &lt;1s Latency: Managing Eventual Consistency in Distributed Search Platforms

At a logistics visibility company, the shipment state can change thousands of times per second due to the massive scale of operations. Such changes take place when, for instance, a...

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infoq.com /5 days ago

JEP 543 Finalizes Structured Concurrency in JDK 28, Ending Seven Preview Rounds

JDK 28 finalizes structured concurrency through JEP 543, with no API changes from JDK 27. Teams on JDK 27 only need to drop --enable-preview and recompile. Code written for JDK 25...

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dzone.com /1 month ago

When an iOS Retry Executes an Agent Twice: Building Effectively-Once Tool Workflows With LangGraph, MCP Tasks, Kafka, an...

A mobile request can fail without the server-side work failing. An iOS app may time out, lose the response after a POST has reached the service, or retry after connectivity changes...

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aws.amazon.com /1 month ago

Resolve Amazon Aurora PostgreSQL lock contention with Database Insights: Part 2

Part 1 showed how row lock contention degrades Amazon Aurora PostgreSQL throughput. In Part 2, use Amazon CloudWatch Database Insights and its Lock Tree to pinpoint blocking sessio...

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javacodegeeks.com /1 month ago

Clojure’s Software Transactional Memory vs. Locks and CAS in Java

A third way to coordinate shared state: optimistic, language-level, and modeled directly on database transactions. Most Java developers reach for one of two tools when state needs...

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javacodegeeks.com /2 weeks ago

The Cost of Freedom: Why Rust’s Async Ecosystem Is Permanently Fragmented

If you have ever built a high-throughput concurrent service in Java, you likely take for granted the simplicity of Project Loom’s virtual threads. You write synchronous-looking cod...

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rubyflow.com /1 week ago

SolidJobs + SolidTrace + Warm IPC perform worker 2000 alloc/s vs 200 alloc/s sidekiq

We are told that to scale Ruby background workloads across multiple CPU cores, we have two choices: process forking (e.g., Pitchfork) which incurs massive Copy-on-Write memory over...

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dev.to /6 days ago

Silent N+1 Database Query Bottlenecks in TypeScript & Node.js REST APIs

Most slow PostgreSQL queries in Node.js REST APIs don’t happen because of missing database indexes. They happen because of silent N+1 query patterns executing inside map loops. W...

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habr.com /1 month ago

Уборщик резервов кадров жил по таймеру в 15 минут. Генерация укладывалась в 16

Баг всплыл не из мониторинга, а из жалобы: клиент написал, что AI-карточка сгенерировалась и легла в пикер, а счётчик кадров в пакете при этом не уменьшился — как будто генерация н...

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