[GitHub] [apisix] hepyu opened a new issue #5692: request help: etcd high load, etcd high cpu usage, and "put /data_plane/server_info" have lots of "apply request took too long" error

[GitBox]

hepyu opened a new issue #5692:
URL: https://github.com/apache/apisix/issues/5692


   ### Issue description
   
   (1).question
   
   1.question-1：
   
   the etcd cluster have 3 nodes, 2 of them has high load and cpu usage,  but 
load and cpu usage of the third node is low, I am so confused：
   
   node1 and node2：high load and high cpu usage
   
![image](https://user-images.githubusercontent.com/3917749/144711239-53a881cf-58c3-4b59-a28e-52430fffe7d7.png)
   
   node3：load and cpu usage is low
   
![image](https://user-images.githubusercontent.com/3917749/144711469-d720cf41-19c1-471f-b5ad-3f9ecdd90f8d.png)
   
   2.question-2： "put /data_plane/server_info" have lots of "apply request took 
too long" error
   
   is this the reason why etcd nodes have high cpu usage and load? 
   
   
![image](https://user-images.githubusercontent.com/3917749/144711405-e5194682-9fd8-46f9-a300-be3451ae9a0a.png)
   
   I don't know why this so simple request had so many error requests.
   
![image](https://user-images.githubusercontent.com/3917749/144711427-978a956f-f276-468e-b56f-428ca58e3917.png)
   
   (2). other information
   
   the etcd cluster have 3 nodes like this：etcd cluster is ok. And this etcd 
cluster support two apisix cluster(version: 2.8.0).
   
   
![image](https://user-images.githubusercontent.com/3917749/144711189-a9d353bd-9375-4875-b15c-0df6636b396a.png)
   
   
![image](https://user-images.githubusercontent.com/3917749/144711008-09825d2e-de06-49ee-91b3-09929959f6cd.png)
   
   
   ### Environment
   
   - apisix version：2.8
   - etcd version：3.5.0
   - OS： aws linux ami 2
   - OpenResty / Nginx version：openresty/1.19.9.1
   - apisix-dashboard version, if have: have two , one is 2.8, another is 2.9.0
   


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