MyCATApache/Mycat-Server

偶发缓冲队列过大如何优化

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#2861 opened on Oct 9, 2021

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 (1 comment) (0 reactions) (0 assignees)Java (9,451 stars) (3,886 forks)batch import
help wanted

Description

应用层显示调用mycat耗时20s,但是mysql监控无慢sql，sql本身走索引了，直接在数据库查询都是毫秒级别返回。 通过mycat-eye监控显示，mycat请求耗时过长的时间点与“Mycat缓冲队列分析”出现峰值的时间点比较吻合。达到100k, 平时都是0 怀疑是队列导致查询总耗时时间过长。这种情况应该如何优化呢。版本是1.67

Contributor guide

Tech stack
javamysql
Domain
backenddatabaseperformance
Issue type
performance
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.
unclear
Prerequisites
JavaMycat internalsbuffer queue monitoring
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate the buffer queue implementation in Mycat Server source code, focusing on classes related to queuing SQL responses. Examine the Mycat eye monitoring data to correlate queue size peaks with request durations. Look for potential bottlenecks in queue processing, such as blocking operations or insufficient capacity. Check if there are known issues or configuration options that affect queue behavior.