Re: [jboss-cluster-dev] Consistent Hashing in mod_cluster

On 9 Apr 2010, at 16:00, Brian Stansberry wrote:

> > Hmm, an issue is if the caches involved in the overall picture (e.g. > httpsession cache and "chat state" cache) end up using different > CacheManagers/JGroups Channels. This would quite likely happen (see > http://community.jboss.org/thread/149868 for discussion why). If that's > the case, the views between the channels could end up slightly different > -- e.g. servers A and B are booting at the same time, so due to slight > differences in the boot, Channel for HTTPSession cache ends up with view > {A, B} and Channel for "chat state" cache ends up with {B, A}. In that > case I wouldn't expect there to be a reliable, performant way to ensure > affinity, since the view is a major factor in the hashing algorithm. Yes, it would not be useful at all if the 2 components end up with different views. It would only make sense if the web session cache and the SFSB session cache share the same CacheManager/Channel.