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From Ben Laurie <>
Subject Re: request for review: server/config discussion
Date Tue, 20 Jul 1999 17:21:00 GMT
"Craig R. McClanahan" wrote:
> Ben Laurie wrote:
> > "Craig R. McClanahan" wrote:
> > > My single biggest gripe about Apache (or Netscape Enterprise Server, and I'm
sure lots of others),
> > > no matter now good it is at what it does, is the fact that you have to restart
the server for the
> > > most trivial configuration file changes.  To me, that's not the way things
should work -- it should
> > > be possible to make incremental changes to existing configurations, at least
to some level, without
> > > global restart being required.  This doesn't seem to be a high priority for
most server
> > > developers (and I'm talking to myself here as well -- Apache JServ 1.1-DEV
still requires restarts
> > > on config changes), but it sure does matter in environments where a server
restart can be very
> > > disruptive to lots of users.
> >
> > a) Apache supports "graceful" restarts for this reason.
> The Apache source code is pretty dense, but it looks like a graceful restart still kills
all the child
> httpd processes and recreates them.  Among other things, that seems to mean all the modules
go through
> their initialization lifecycle again.

Yes, but not if they are currently processing a request. This means it
doesn't disrupt users.

> > b) Supporting incremental changes could get pretty complicated, because
> > of cached derived information. I suppose simply blowing away all the
> > caches is feasible, though.
> >
> Speaking as an author of server-side stuff as well (Apache JServ 1.1-DEV) I am familiar
with the "pretty
> complicated" parts of it.  Basically, you can no longer count on certain things being
static for the
> life of your server, and this has lots of ramifications.  But exit/restart is still the
lazy way out of
> dealing with the issue.

And is there something wrong with laziness? :-)




"My grandfather once told me that there are two kinds of people: those
who work and those who take the credit. He told me to try to be in the
first group; there was less competition there."
     - Indira Gandhi

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