Liferay 6.2 CE GA2 Tomcat bundle100% CPU utilization

[William Gosse，修改在9 年前。]

I have a Liferay 6.2 CE GA2 Tomcat deployed on a Win 2008 R2 server in AWS (large). There's pretty much no load right now and it runs all day at 0% CPU. And then all of a sudden it degrade to 100% CPU. There no custom portlets at this time only a custom theme with some static content. Theme was develop by a third party. I have an Apache httpd acting as a front door and I can see that the site is getting accessed and there is some web crawling going. When the CPU goes to a 100% its all on the tomcat server. I just put VisualVM to dig into this. I'm curious if anyone else has seen anything similar with Liferay 6.2 CE GA2?

[David H Nebinger，修改在9 年前。]

All of a sudden?

Is there any user activity at the time? Or could this be the result of a scheduled activity? Doing any LDAP import or populating the DB on the backend or something?

It's certainly not SOP.

[William Gosse，修改在9 年前。]

We are not doing anything like what you've listed. But I did notice, with visualvm, that the quartz scheduler was consuming a lot of the cpu time. I disabled it for now to see if that resolves the issue. I also uninstalled the calendar portlet as well. I'll be honest this is an area of liferay I know very little about.

[Juan Gonzalez，修改在9 年前。]

Hi William,

maybe you are running into this bug: https://issues.liferay.com/browse/LPS-47533.

Can you try to upgrade to 6.2.2 to see if it still reproduces?

[Olaf Kock，修改在9 年前。]

A good recommendation to check what's going on when this kind of activity happens is to generate a few thread dumps and analyze them for common aspects. While stacktraces are not too much fun to read, they're typically quite informative - especially when you don't have to pay attention to line numbers but for repeated patterns between the similar thread dumps.

[William Gosse，修改在9 年前。]

Please see my following post:
https://www.liferay.com/community/forums/-/message_boards/message/49746751

[Olaf Kock，修改在9 年前。]

On quick glance it sounds like LPS-47533 was not a bad suggestion by Juan above. Did you upgrade to GA3 and try to reproduce?

[William Gosse，修改在9 年前。]

I haven't upgraded to GA3. I'm waiting for GA4 to come out, hopefully soon. I did add to following mysql tuning suggestions: https://www.liferay.com/community/wiki/-/wiki/Main/Tuning+the+Database

[William Gosse，修改在9 年前。]

So I've upgraded to a GA4 and I also replaced MySQL with Postgres. But I'm still of struggling with this high cpu issue on my production Liferay Tomcat server. I had this on GA2 and I was hoping GA4 would help solve the problem but its still with me.

I need to dig into this one a little. This is the first time I've used GA4 in a production environment I didn't see anything like this issue on 6.1. I'm running on a Win 2008 R2 server with 4 cores and 16gb of ram. Memory doesn't seem to be an issue. Something causing my request threads to get stuck occasionally. I'm front ending Tomcat with a Apache httpd with AJP protocol. I've used this setup in the past with no issue. The only other thing that new for me is that I'm using a third party theme.

I just enabled yourkit on my server to see if I can figure this one out. It will run all day fine then all of a sudden it goes to 25% then eventually 100%.

See my other post for more details:https://www.liferay.com/community/forums/-/message_boards/message/53171438