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High CPU usage on Talend job

I have a talend job process 26 million rows. just simple aggregate component. When i run the job. the CPU usage is very high, almost reach 99% Anybody can give me the possible reasons cause this? And do i need to change any configuration?
We run the talend job on REDHAT.
Thank you.

Re: High CPU usage on Talend job

What component do you used? If there is a tMap component, try to use "store on disk" option. Besides, we don't have a better way to resolve this issue our component developers always commit on that.
Best regards
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