Support Questions

Find answers, ask questions, and share your expertise
Announcements
Celebrating as our community reaches 100,000 members! Thank you!

My Cluster CPU always stays at 80% when nothing is running

avatar
Contributor

Hi everyone,

 

I have an cluster which nothing is running currently, however the CPU usage always stay at 80%, any idea what else can I check?

 

 

1 ACCEPTED SOLUTION

avatar
Contributor

@manuroman

 

I rebooted the 3 datanodes, now it is clear.

 

Thank you!

View solution in original post

4 REPLIES 4

avatar
Master Guru

@yongie,

 

If you are seeing 80% CPU in the Cluster CPU chart, expand that chart and take a closer look at what host or hosts are reporting the highest cpu.  Then you can go look at the charts for those hosts and find out if CDH processes may be responsible for the cpu.

 

Also you can use tools like "top" to look at what processes are taking the most CPU.

 

cpu_percent_across_hosts takes into account cpu % over all your hosts; it is not only explaining what CDH roles are using.

avatar
Contributor

Thanks for the reply,

 

I have checked, all 3 datanodes are having 100% cpu in the chart, when I log in to the host through terminal and run top command, yarn is responsible for the cpu usage, all 3 datanodes is having 400% cpu utilisation by yarn.

avatar
Expert Contributor

Hi @yongie,

 

You have two options:

 

1) Assign more resources to the Yarn Service if you have them availables.

2) Kill all process that are using CPU in this case YARN

 

 

Regards,

Manu.

avatar
Contributor

@manuroman

 

I rebooted the 3 datanodes, now it is clear.

 

Thank you!