延迟医生
语法
LATENCY DOCTOR
- 从以下位置开始可用：
- 2.8.13
- 时间复杂度：
- O（1）
- ACL 类别：
-
@admin,@slow,@dangerous,
这LATENCY DOCTORCommand 报告与延迟相关的不同问题，并就可能的补救措施提供建议。
此命令是延迟监控中最强大的分析工具
框架，并能够提供额外的统计数据，如平均
延迟峰值、中位数偏差和人类可读之间的时间段
事件分析。对于某些事件，例如fork、其他信息
，例如系统 fork 进程的速率。
如果您是 寻求有关 Latency 相关问题的帮助。
例子
127.0.0.1:6379> latency doctor
Dave, I have observed latency spikes in this Redis instance.
You don't mind talking about it, do you Dave?
1. command: 5 latency spikes (average 300ms, mean deviation 120ms,
period 73.40 sec). Worst all time event 500ms.
I have a few advices for you:
- Your current Slow Log configuration only logs events that are
slower than your configured latency monitor threshold. Please
use 'CONFIG SET slowlog-log-slower-than 1000'.
- Check your Slow Log to understand what are the commands you are
running which are too slow to execute. Please check
http://redis.io/commands/slowlog for more information.
- Deleting, expiring or evicting (because of maxmemory policy)
large objects is a blocking operation. If you have very large
objects that are often deleted, expired, or evicted, try to
fragment those objects into multiple smaller objects.
注意：医生的心理行为不稳定，因此我们建议仔细与之互动。
有关更多信息，请参阅 Latency Monitoring Framework 页面。