Skip to content

ansys_moniter.md

Latest commit

 

History

History
51 lines (32 loc) · 1.22 KB

ansys_moniter.md

File metadata and controls

51 lines (32 loc) · 1.22 KB
Raw

English | 中文版

Redis Source Code Analysis - Monitor

[TOC]

Clients can turn themselves into a monitor to receive and print, in real time, information about commands the server is currently processing.

Use the following command to make a client a monitor:

MONITOR

Command reception and information propagation:

graph LR
Client--send command request-->s{Server}
s--send command info-->m1(Monitor1)
s--send command info-->m2(Monitor2)
s--send command info-->m3(Monitor3)
Loading

Becoming a monitor

/** @brief command: monitor */
void monitorCommand(redisClient *c) {
	/* ignore MONITOR if already slave or in monitor mode */
	if (c->flags & REDIS_SLAVE) return; /* slaves are not allowed to become monitors */

	c->flags |= (REDIS_SLAVE|REDIS_MONITOR);
	listAddNodeTail(server.monitors,c); /* add to monitors list */
	addReply(c,shared.ok);
}

Sending command info to monitors

Before processing each command request the server calls replicationFeedMonitors, which sends information about the command being processed to all monitors.

References

[1] Huang Jianhong. Redis Design and Implementation

[2] Monitoring metrics overview (https://zhuanlan.zhihu.com/p/152087914)