> On Tuesday, August 08, 2006 02:49:41 PM -0400 Derek Atkins
> <[EMAIL PROTECTED]> wrote:
> > Ken Hornstein <[EMAIL PROTECTED]> writes:
...
> > I wonder if we could add a cache manager query so that apps could
> > ask the cache manager for server stats? Obviously this would be
> > an optional query, and the app should continue to use the current
> > random choice if there is no cache manager. But I think it would
> > help this case if there were some way to store this kind of state
> > on a client.
> You mean like VIOCCKSERV, which tells you which servers the cache manager
> currently thinks are down? Or more like VIOCGETSPREFS, which tells you
> what preference order the cache manager has assigned to servers?
Don't those deal with fileservers?
And isn't the case at hand dealing with DB servers?
Seems to me that a far simplier method would be for stand-alone
clients to start with a short timeout and circle through the
DB servers quicker.
To wit, something like this, in pseudo-code:
for (i = 4; i <= 4096; i <<= 1) {
for (j = 0; j < n_DBservers; ++j) {
rc = connect_to_server_with_timeout_in_msecs(server[j], i);
if (rc == SUCCESS) break;
}
}
if (rc != SUCCESS) die_a_horrible_death();
John
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