> Server request per msg per user. Is not necessary.

Sure  it  is. This is the only way to allow the back end to be updated
asynchronously,  whether through the GUI, web administration, ODBC, or
whatever.

> But a separate service is idea

Sure,  but  your  app  is  not a cache. It's a middle tier that uses a
two-phase  commit,  and you've implemented it in a situation where all
transactions  go  through  this  tier. Imail will still, as it should,
check  the  Registry (which runs from RAM) on every message. I am very
happy  that  it  does,  rather  than  having  to, say, restart all the
services  whenever  you add a user asynchronously to refill the cache.
And  I'm  happy that we don't have to run anything on the Imail server
to  reread the whole back end into a separate memory cache (true, this
would  be  useful  for some people, but would be ridiculous under load
and  a big user base). If you want to have a distributed system, these
are the costs.

Sandy




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