Implementing Automatic Order Cancellation for Timeout Orders in a Monolithic Backend System

This article explains three backend solutions—database polling with scheduled tasks, JDK DelayQueue, and Netty's HashedWheelTimer—for automatically cancelling unpaid orders after a timeout in a monolithic architecture, detailing their implementation steps, pros, cons, and optimization tips with Java code examples.

DelayQueueHashedWheelTimerautomatic cancellation

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Implementing Automatic Order Cancellation for Timeout Orders in a Monolithic Backend System

Su San Talks Tech

Jan 14, 2025 · Backend Development

Mastering Dubbo’s Time Wheel: From Theory to Source Code

This article explains the concept and implementation of the time wheel in Dubbo, covering its use for scheduled retries, heartbeat handling, underlying HashedWheelTimer mechanics, configuration details, performance considerations, and related issues, providing a thorough guide for backend developers.

DubboFailbackHashedWheelTimer

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Mastering Dubbo’s Time Wheel: From Theory to Source Code

Top Architect

Mar 29, 2022 · Backend Development

Various Implementations of Delayed Tasks in Java: Quartz, DelayQueue, HashedWheelTimer, Redis, and RabbitMQ

This article compares several approaches to implementing delayed tasks in Java, including Quartz polling, JDK DelayQueue, Netty's HashedWheelTimer, Redis sorted sets and keyspace notifications, and RabbitMQ delayed queues, analyzing their principles, code examples, advantages, and drawbacks for order timeout handling.

BackendDelayQueueHashedWheelTimer

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Various Implementations of Delayed Tasks in Java: Quartz, DelayQueue, HashedWheelTimer, Redis, and RabbitMQ

Su San Talks Tech

Jan 13, 2022 · Backend Development

How Dubbo Leverages Hashed Wheel Timer for Efficient Retries and Heartbeats

This article explains the principles of time wheels, how Dubbo implements them for retry mechanisms and heartbeat scheduling, walks through the relevant source code, discusses performance considerations, and references related issues and improvements in both Dubbo and Netty.

DubboHashedWheelTimerHeartbeat

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How Dubbo Leverages Hashed Wheel Timer for Efficient Retries and Heartbeats

Xiao Lou's Tech Notes

Sep 27, 2021 · Backend Development

How a Dubbo 2.7.12 Bug Caused Memory Leaks and Service Outages – Diagnosis and Fix

After a late‑night incident where a Dubbo 2.7.12 service crashed, the author traced high memory and CPU usage to a full GC spike, identified a HashedWheelTimer thread‑pool bug causing request timeouts to be missed, reproduced the leak, and confirmed the issue was fixed in Dubbo 2.7.13.

DubboHashedWheelTimerThreadPool

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How a Dubbo 2.7.12 Bug Caused Memory Leaks and Service Outages – Diagnosis and Fix

JavaEdge

Oct 14, 2020 · Backend Development

How Dubbo Implements Efficient Timers with a Hashed Timing Wheel

This article explains the need for high‑performance scheduling in Java, introduces the hashed timing wheel algorithm, and details Dubbo's implementation—including core interfaces, data structures, worker logic, and practical use cases such as retries and heartbeat handling.

BackendDubboHashedWheelTimer

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How Dubbo Implements Efficient Timers with a Hashed Timing Wheel