-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Konstanti,
On 12/6/12 3:39 PM, Konstantin Kolinko wrote: > 2012/12/6 Smith, Mitchell <mitchell.sm...@cwc.com>: >> >> I have a jvmRoute appended to my JSESSIONID to enable sticky >> sessions at an application level. >> >> I see often that users do not close browsers, resulting (even if >> the tomcat session has expired) the user to be forwarded back to >> the instance. >> >> Is it possible to set an expiry for the jvmRoute / JSESSIONID to >> be expired at the browser so after x amount of time since last >> request the jvmRoute is not transmitted back to the application >> apache load balancer. This would prevent users constantly being >> directed to the same application node. >> > > 1. Even if one can set expiration time for the session cookie > (configurable in a Servlet 3.0 compliant application), you cannot > do anything if somebody publishes a link containing a jsessionid in > it somewhere, e.g. on a forum. > > What I can think of is to make the jvmroute itself temporary e.g. > by changing it periodically. > > 2. How one additional user can be a problem in such a system? If > he accesses a heavy-loaded system the things will be slow for him, > but faster for all others, who close their browsers regularly. Let's take a pathological example: Assumptions: 1. Cluster has 3 nodes (A, B, C) 2. Users never close their browsers Let's say that server A is rock-solid and never goes down. Servers B and C are running Gentoo Linux or Debian Sid or Microsoft Windows or have flaky hardware and so they crash or need to be rebooted all the time; perhaps daily. Users on nodes B and C will constantly fail-over to node A. Those users will stick on node A pretty much forever. Therefore node A always gets most of the traffic, and nodes B and C only get "new" users for a while before failing-over. Even if nodes B and C can handle 1/3 of the load, they will get much less than that, and node A will, over time, accumulate users without bound. It would be nice to avoid this kind of situation. > So one could recommend that if things go slow to close one's > browser, clean caches, or even reboot. ;) If I called tech support for a website and they told me I needed to close my browser or reboot my computer to just to use their website, I would assume that they were complete idiots. If I want to be lied to about what the problem is, I'll call my home broadband provider. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with undefined - http://www.enigmail.net/ iEYEAREIAAYFAlDBJTsACgkQ9CaO5/Lv0PDciACeIiAmy+jUn0Y8Y114gKuDMk+T p5gAoJyh8wyhM8BP5GRknZh+McIqGfE+ =DwDL -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
