On 14.10.2010 17:49, Oscar Celada wrote:
I have installed apache httpd 2.2.10 with mod_jk 1.2.28 and tomcat 6.0.29 (a cluster with six nodes). Some times apache has all his threads busy (512), in theses moments I want to change same parameter in the jk module (I know which is the tomcat of my cluster that cause this problem and I want check out this node from my cluster). The problem is that the apache is collapsed and It doesn't response that the request that I do against the jk module (I suppose that is because apache doesn't has got one free thread). Is there any way to book one thread for request against mod_jk in the apache server?
No, either you have to detect the situation in advance, so that not all threads are aleady blocked - which under high load might be difficult - or you have to switch to other solutions:
- configure better timeouts for mod_jk, so that those threads don't stay stuck. See for example the sample configuration contained in the mod_jk 1.2.30 source tarball download. The sample configuration in older mod_jk downloads is pretty outdated.
- set activation for the broken Tomcat to "stopped" in the workers.properties and do a hard "restart" of Apache (which will also stop all other running requests, but in such a situation it is unlikely that the web server is still able to serve requests).
In case there's more questions: the right list to discuss mod_jk is the Tomcat users mailing list.
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