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A real CompletableFuture chain, rewritten into StructuredTaskScope, plus the JDBC cancellation gap nobody’s fixed yet. Java developers who learned concurrency on CompletableFuture ...
Need to perform asynchronous operations and support multitasking in your app? Async/await is at your service — simple and elegant. The cooperative thread pool efficiently switches...
22. The Best Distributed Lock Is Often No Lock at All By now, we've explored distributed locks, leases, fencing tokens, leader election, and consensus. Each of these mechanisms e...
A game wallet often starts as a single balance field. That is fine for a prototype, but payment retries and unreliable networks quickly make the number hard to trust. A player can...
Modern backend applications handle thousands or even millions of requests every second. Users perform actions simultaneously: buying products, transferring money, updating profiles...
Однажды я решил проверить на практике байку, которую слышал на десятке собеседований: “у нас на проде было такое-то место продано дважды, потому что…”. Оказалось, воспроизвести это...
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...
Я делаю сервис онлайн-записи для салонов красоты: клиент записывается в чат-боте или на странице, а запись падает в расписание мастера. Однажды мастер написал мне: на 15:00 к ней п...
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...
JDK 24 removed the monitor-related carrier-thread pinning that stalled Netflix and similar teams on Java 21. What has replaced it on JDK 25 LTS is downstream-resource saturation: T...
Originally appeared on Rails Revelry.A support team suspends 37 accounts after a credential leak. The operation reports that all 27 rows changed, and a fresh query confirms that ea...
Distributed systems often need to handle concurrent writes from multiple replicas. In a traditional design, coordination, locking, or consensus decides which write wins. CRDTs—Conf...
The Hidden Cost of API Versioning Hell Continuous API evolution is non-negotiable in contemporary software development, yet maintaining backward compatibility remains an incredibly...
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...
A scheduled job that needs ninety to one hundred eighty seconds to produce a single output file looks harmless until the day you ship a new build while it is still running. The dep...
Здравствуйте, Хабровчане! Меня зовут Дмитрий, я бэкенд разработчик Java. Недавно я наткнулся на задачу, которая сначала показалась мне копеечной, а потом сожрала неделю вечеров и з...
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