Sharma, from the 1.2.19 code the request should also work by completely omitting the id parameter and only using the worker name :)
Regards, Rainer Sharma, Siddharth schrieb: > Hi Rainer > Thx for the response. > > What does "missing answers" mean? > If there is no http body, will it be marked down? > > Yea, I figured that status is probably the best way to do it. > I already have status configured and I figured out the request parameters. > Only complication is the "id" parameter. > Even if I provide the "w" parameter as the worker name, it does not update > its status unless the 'correct' "id" value is provided. > "id" value seems to be a positional index of the worker in the configuration > or something. > This sort of sucks for me because my coding will not be straightforward and > I will have to maintain the mapping of worker name and id. > > > > -----Original Message----- > From: Rainer Jung [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 07, 2006 3:58 PM > To: Tomcat Users List > Subject: Re: Load balancing mark down question > > Hi, > > Sharma, Siddharth schrieb: >> Hi >> >> We have a cluster of Linux (RedHat) machines each housing an apache, 4 >> tomcat instances and 4 other jvms that run our custom servers. >> Each tomcat has a corresponding custom server that it delegates requests > to. >> In other words, there is one to one correspondence between a tomcat > instance >> and a custom server instance. >> Problem is that when a custom server crashes and its tomcat is still >> accepting, mod_jk does not mark it down. Consequently users continue to be >> directed to that tomcat even though they are experiencing errors. >> In mod_jk, we have defined a load balancing worker that fronts the 4 > tomcat >> workers. >> So questions are: >> >> 1. On what basis does mod_jk mark a tomcat worker down? Is it http return >> codes? > > Never http return code. jk detects communication failures betwenn apache > and tomcat: > > - timeouts > - connection problems > - missing answers > - client (browser) aborts > >> 2. Some load balancers allow scraping of the http body to see if there is > an >> error in addition to relying on http codes. Is that possible in mod_jk? Is >> it configurable? > > No. You need to do that externally. > >> 3. Is it possible to stop|start a mod_jk worker via an http call? Or some >> other programmable way? > > Yes. Configure a status worker: > > worker.list=admin > worker.admin.type=status > > The name of the worker (here: admin) is arbitrary. > Map the worker to a url in your web server, e.g. using JkMount in > Apache. Add access control to the URL (using web server methods). > > Then open the URL in your browser and get used to its features. You can > click on the individual worker members of a balancer and a form will pop > up, allowing to disable (no more new sessions) or stop (no more > requests) this worker. The request when sending the form is a GET > request, so you can learn the URL syntax easily. > > Be careful: these changes are not persistant. Apache restart, even > graceful, throws you back to your config file settings. > > Regards, > > Rainer > >> Any ideas on how to solve this problem? >> >> Thanks >> Sidd >> >> --------------------------------------------------------------------- >> To start a new topic, e-mail: users@tomcat.apache.org >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
