Below I assume the application entry-point is a servlet, even though the
concept applies for any entry-point above the AppServer.
Am I correct to assume that vendor-specific clustering cannot handle session
fail-over when HTTP services are provided by anything but the clustering
AppServer? This seems obvious but I just want to clarify my understanding.
It would follow that to provide complete fail-over, it would be necessary to
have a cluster controller at a level higher than the web server. If this is
true, then I'm having trouble determining what vendor-specific AppServer
clustering provides that I can't add myself very easily.
I've read several vendors' AppServer clustering documents and as far as I
can see, we are doing all this in a more portable way. The code took only
two days to conceive and write and I feel there must be something I'm
missing in all the much touted vendor-specific clustering. It's true that we
insert a fail-over "cluster controller" at the "top" of our system, but that
appears to be necessary even with a vendor specific solution when it is
behind a webserver.
So will someone please enlighten me on this topic?
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