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When a production Java service repeatedly restarts and triggers full GC and OutOfMemoryError alerts, this guide shows how to capture heap dumps using JVM flags, install and configure Eclipse Memory Analyzer (MAT), and systematically analyze the dump to pinpoint memory leaks, high usage, and problematic code.
This article examines the challenges of virtual asset operations, compares workflow engines and finite state machines, outlines their core concepts, implementation methods, and open‑source options, and presents a practical internal‑DSL‑based solution for high‑performance, asynchronous backend processing.
This article explains Java's AbstractQueuedSynchronizer (AQS) core architecture, including its state variable, CLH queue, condition queue, template methods, and the detailed implementations of acquire, release, and node management that enable building custom locks and synchronizers.
HTTP/2 introduces a binary framing layer, multiplexed streams, header compression, and server push, replacing the limitations of HTTP/1.x by enabling a single TCP connection to carry multiple concurrent requests, reducing latency, improving bandwidth usage, and simplifying web development, while also presenting new debugging challenges.
This article explains the principles, benefits, and challenges of master‑slave, multi‑master, and leaderless database replication, discusses replication lag, quorum consistency, conflict resolution, and presents various data partitioning techniques with practical examples and diagrams.
This article explains the Raft consensus algorithm, detailing how it breaks consistency into leader election, log replication, and safety, and describes the roles, term handling, election rules, log matching, snapshotting, and the RPC mechanisms that ensure a reliable distributed state machine.
This article explains Elasticsearch’s fundamental building blocks, cluster roles, shard and replica strategies, master election, split‑brain prevention, inverted index structure, and the complete search and indexing lifecycle for handling large‑scale data efficiently.
This article explains the purpose and advantages of MySQL indexes, compares MyISAM and InnoDB storage engines, details B+‑tree, full‑text, and hash indexes, and provides practical optimization techniques to improve query performance while noting their trade‑offs.
This article explains a layered microservice architecture, detailing the responsibilities of Facade, Application, Domain, and Infrastructure services, the interaction patterns within and between services, strict versus loose layering, and the roles of various data objects such as PO, DO, DTO, and VO.
This article explains the distinction between user and kernel space, outlines the steps involved in a process switch, and compares several Linux I/O models—including blocking, non‑blocking, multiplexing, and asynchronous approaches—highlighting their advantages and drawbacks.
