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JD Cloud Developers
JD Cloud Developers
Sep 12, 2023 · Backend Development

Why Netty’s Direct Memory Stalls on JDK 17: A Deep Dive into Low‑Latency Bottlenecks

An in‑depth analysis of the Tianwang risk‑control Lingji system reveals how JDK 17’s ZGC, Netty’s direct‑memory allocation, and cross‑data‑center channel limits caused severe latency spikes, memory growth, and CPU usage, and outlines the debugging steps and configuration changes that finally resolved the issue.

Nettydirect memorylow-latency
0 likes · 16 min read
Why Netty’s Direct Memory Stalls on JDK 17: A Deep Dive into Low‑Latency Bottlenecks
Practical DevOps Architecture
Practical DevOps Architecture
Nov 23, 2021 · Fundamentals

Understanding Memory Leaks, Memory Overflow, Young GC STW, Major vs Full GC, and Direct Memory in Java

This article explains the difference between memory leaks and overflow, whether young GC triggers stop‑the‑world pauses, distinguishes major GC from full GC, and describes Java's direct memory usage, providing clear insights into Java memory management and performance considerations.

Garbage Collectiondirect memorymemory-management
0 likes · 4 min read
Understanding Memory Leaks, Memory Overflow, Young GC STW, Major vs Full GC, and Direct Memory in Java
ITPUB
ITPUB
Jun 27, 2021 · Fundamentals

How Multi‑Level Caching Boosts Performance and Avoids Common Pitfalls

This article explores the role of multi‑level caching—from distributed and local caches to direct memory and CPU cache—detailing performance gains, cache‑miss handling, consistency challenges, false sharing issues, and practical mitigation techniques such as approximate LRU, random TTL, delayed double‑delete, padding, and lock‑free designs.

CPU cacheCache Consistencycaching
0 likes · 13 min read
How Multi‑Level Caching Boosts Performance and Avoids Common Pitfalls