MyCATApache/Mycat-Server

Mycat server 1.6.6.1 频繁 full gc问题

Open

#2939 opened on Oct 12, 2023

View on GitHub
 (0 comments) (0 reactions) (0 assignees)Java (9,451 stars) (3,886 forks)batch import
help wanted

Description

BuildTime 2018-10-31 11:55:33 GitVersion null MavenVersion 1.6.6.1-release

Mycat 1.6.6.1 目前部署了两个，承载的上端业务代码是同一套 目前一个mycat运行很平稳，也很正常

另外一个就会出现频繁full gc的情况 jvm参数如下 35f4a55fc4b9fb705762daa472e5950a

现象如下： 408853549c27ebd468a269d7425e3eb8

堆栈信息如下： 829e53f5fa66d3a0b969328deceb86e3

760c41711b2dff07ca7b63b9c4d42eb2

c171f6eba9e7f1078f654cc99e1b6e20

31f559038d812db1a9d82a7900a6a5d2

Contributor guide

Tech stack
java
Domain
backenddatabaseperformance
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
JavaJVM profilingheap dump analysisMycat internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Analyze the heap dump images attached in the issue to identify objects causing full GC. Compare JVM flags between the two Mycat instances to find configuration differences. Review Mycat source code for potential memory leaks in connection pool or SQL parsing. Contact maintainers for reproduction steps and additional logs.