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High Availability Architecture
High Availability Architecture
Jul 11, 2024 · Backend Development

AutoMQ Memory Cache Design and Mitigating Netty PooledByteBufAllocator Memory Fragmentation

The article explains AutoMQ's memory‑cache architecture, compares LogCache and BlockCache designs, analyzes Netty's internal and external memory fragmentation caused by the Buddy and PageRun/PoolSubpage allocators, and presents mitigation techniques such as ByteBufSeqAlloc to reduce OOM risks.

CacheDesignDirectMemoryMemoryFragmentation
0 likes · 14 min read
AutoMQ Memory Cache Design and Mitigating Netty PooledByteBufAllocator Memory Fragmentation
Qunar Tech Salon
Qunar Tech Salon
Jan 31, 2023 · Operations

Root Cause Analysis and Mitigation of JVM GC‑Induced OOM and Memory Fragmentation in a Containerized Hotel Pricing Service

This article details how long JVM garbage‑collection pauses and glibc ptmalloc memory‑fragmentation caused container OOM kills in a hotel‑pricing system, and explains the step‑by‑step diagnosis, JVM tuning, Kubernetes health‑check adjustments, and the replacement of ptmalloc with jemalloc to eliminate the issue.

GCJVMKubernetes
0 likes · 9 min read
Root Cause Analysis and Mitigation of JVM GC‑Induced OOM and Memory Fragmentation in a Containerized Hotel Pricing Service