Tomcat 7 Cluster with load balancing only needs to run a service periodically
The Tomcat cluster is configured as load balancer only. There is no session replication. So in case a Tomcat node on which the user session is running, dies in that case the session is lost. We do need to run a service on that cluster periodically. Obviously it cannot run on both servers, but at the same time one has to ensure it has to be run on at least one server after certain interval. What is an elegant solution in this case? Regards, Suhaas
Re: Tomcat 7 Cluster with load balancing only needs to run a service periodically
Thanks for your response. No. I am not allowed to use cron :-) One thing I have been asked to look at is nodes co-ordinating by sending events to each other. But again I am wondering how coordination would take place in case one node goes down. In that case, when it is started again and becomes a part of the cluster, it would try to start services that shoukd run periodically. But its intervals woukd be out of sync wit rest of the clusters. Regards, Suhaas On May 20, 2014 9:11 PM, "Christopher Schultz" wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA256 > > Suhaas, > > On 5/19/14, 11:40 AM, Suhaas Lang wrote: > > The Tomcat cluster is configured as load balancer only. There is no > > session replication. So in case a Tomcat node on which the user > > session is running, dies in that case the session is lost. > > > > We do need to run a service on that cluster periodically. Obviously > > it cannot run on both servers, but at the same time one has to > > ensure it has to be run on at least one server after certain > > interval. > > > > What is an elegant solution in this case? > > Use cron with a non-web-based tool? > > - -chris > -BEGIN PGP SIGNATURE- > Version: GnuPG v1 > Comment: GPGTools - http://gpgtools.org > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQIcBAEBCAAGBQJTe/0ZAAoJEBzwKT+lPKRY7ogQAIBomKhx/ii5MvMs2ip3n08H > RLCPHSMg1ZN9TvbWbYfiGY+fxTCf+r/KN+v3YIJ38gbLNgZ++UcZ8cqMZD3tXWk+ > bF7eo9BzisSzKLfXqrQ8+KjOpygpMXorMduEGB8dUG9ySx6ntZjD0254EdqaFC5h > 6+Z0D59KJ9JS70pbLkkVGRSoWTKGRQPMwuoO/bwtrLcUm2QmbFqAxj/sbFVN3Qas > 63c5KcEY1crnxLkr0DkujKuaImJa+qEYntZxXwnbk2I4mBVGNVmsBoRRUYA0Le/M > 1JdvEl12alHIbyTQHeEcyCq0KpNqFbeVfXAnYwMg/Sx6Y8JMkv4jzpooCbRvzkJO > mZMlOgZKZQ2c94Lqx6Q7u9ZCCOGk1jvcv7R2BzK36rpd/Xv6x6EFLyEHcp86oY4s > 2348RtUb0chF4he5UCeeQEHppdJt4zImMCw/Ar5CD0m8mQZBAUjFcjbF1w3RqUmt > KPP6VWDMebyZHRS1f18SHDzcArY7+b155rbgXB9HQx262UmA0hPweyNmxRkKxzLR > KmZDIVjfpk/+gOdB5HQIp9AgRj6zJhSmt0lUpWCqERlJlCASeOP7MBVaHERzUvJP > JCudcBNplxxexXQ+qV3UUmqDZzsbK8PqX1kzCuIVEKkyY6e1F6n6NqGgxHOP5Pbm > 3u1Aw2Vm1Vqf/+2N2oiE > =jTiU > -END PGP SIGNATURE- > > - > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
Re: Tomcat 7 Cluster with load balancing only needs to run a service periodically
Yes, Christopher, I know. Any pointers? Any open source libraries that might be worth looking at? Regards, Suhaas On May 26, 2014 2:52 PM, "Christopher Schultz" wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA256 > > Suhas, > > On 5/21/14, 9:46 AM, Suhaas Lang wrote: > > Thanks for your response. No. I am not allowed to use cron :-) > > > > One thing I have been asked to look at is nodes co-ordinating by > > sending events to each other. > > > > But again I am wondering how coordination would take place in case > > one node goes down. In that case, when it is started again and > > becomes a part of the cluster, it would try to start services that > > shoukd run periodically. But its intervals woukd be out of sync wit > > rest of the clusters. > > Sounds like you need to do some research. > > - -chris > > > Suhaas On May 20, 2014 9:11 PM, "Christopher Schultz" > > wrote: > > > > Suhaas, > > > > On 5/19/14, 11:40 AM, Suhaas Lang wrote: > >>>> The Tomcat cluster is configured as load balancer only. There > >>>> is no session replication. So in case a Tomcat node on which > >>>> the user session is running, dies in that case the session is > >>>> lost. > >>>> > >>>> We do need to run a service on that cluster periodically. > >>>> Obviously it cannot run on both servers, but at the same time > >>>> one has to ensure it has to be run on at least one server > >>>> after certain interval. > >>>> > >>>> What is an elegant solution in this case? > > > > Use cron with a non-web-based tool? > > > > -chris > >> > >> - > >> > >> > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > >> For additional commands, e-mail: users-h...@tomcat.apache.org > >> > >> > > > -BEGIN PGP SIGNATURE- > Version: GnuPG v1 > Comment: GPGTools - http://gpgtools.org > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQIcBAEBCAAGBQJTg41EAAoJEBzwKT+lPKRY7gsQAJgd8gyKsWU+mAMYKvxAaH0m > d0a9pYfQgAJAxfXQWT1Rvu4fJ1ECk/nKVzC7Onx3tWEP+3ddoMA0BIi5U/eaU/Og > gqhMCeW4Y5LRPtVeiviTg2qUAir9fSv8P9NBJd0EiYQ//MwFr0OF2acnPW9dmPpk > nZX+Q9aVJsztoz0wqlRth0+ty0kksXaET09L+oIKnlvaPUh26qf+8ySwPYFewVRi > J3A0VkknAj3u9PUjGbAQG1NpPfUMBx5DKViPfhix2tEnTuLN6I+YKUQXUJDZeqYB > Dwe5NpdscZD2WfjULetGiP4TxzT9uUfuEnWnXPDSN+FoexEkbUEMQ1TDu/Ireypp > E0rM5UHfR5NuzlmF/CfUHbIrwvlY6Onc8eyoCaC6IuKOHUWy/L3dtcuoSK90BW0Q > WnsrZE1uICHzi5akLFkMRvimrQfTnXEKW9qkMwVTBLBCvsHl8y4eJRQa7Lh6T20a > XqJgKlauC4jfIJBPowBUVfkrAL8IDSKUO0xyO9aVGhhAG+gC8foGzuKHn1aaBzAc > eXUnc/NkI7GNTKOBqPcsjB3tnZD0Em8XhJrZU34B1xJU1OfZnwJUo131IKL+xoWb > QME5+Nx16Dy6QoId+RnvHy4WyFDzZ86UQlgV2IkwYMG/GzGsZWPoMa2heUb0TeNa > wfGoGVByfoJZlwQ6rxEo > =EdQJ > -END PGP SIGNATURE- > > - > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
