[Zope] is zope a solution?

[Jim Penny]

On Fri, Aug 31, 2001 at 06:58:57PM +0100, tonyl wrote:
> On Friday 31 Aug 2001 16:32 pm, Jim Penny wrote:
> 
> >
> > Reliabilty is good.  To make it better, I run Jerome Alet's isdazope
> > script.  It checks to make sure zope is responsive at 1 minute intervals.
> > If not, it restarts zope.  I seem to get about 2 restarts per week.
> > These usually involve write conflicts.
> 
> 
> Are you saying zope crashes or fails twice a week? Surely that makes it 
> unusable in a real environment, or is "write conflict" a bug in the site's 
> implentation of zope? I'm confused!

(There is a known rare bug in the 2.3 series whereby the transaction machinery
to an external database forgets to close transactions.  I may be seeing
by this.  I may be taking an occasional cosmic ray, who knows.)

Yes, I am saying that the version I have crashes once or twice a week.
No, it does not make it at all unusable.  There are 86400 minutes in
a week. this makes it available  99.9976% of the time.  It is automatically
restarted after a minute without response goes by, so I do not have to
be here, etc.

Apache in my experience is better in terms of uptime.  But I have had it
crash, too.  I have had PostgreSQL crash.  I have has AS/400 services
crash.  Once you get beyond 3 9's of uptime, it starts to cost money.
I am running on clone hardware with no ECC, etc.  Prepare not to have
99.999% uptime, and you can handle 99.99% uptime quite well.

BTW:  I am not using zope in a "typical" profile.  I am doing far more
relational database work than appears to be normative.  I am doing more
concurrent writing than appears to be normative.  (My PostgreSQL log
file is about 15 Meg per day.  so far today I have done 24,000 inserts,
1,000 inserts and 600 updates, and as the last day before holiday, this
is very light).  

Given my experience, I can whole-heartedly recommend zope, and I 
suspect that most users would find less trouble with it than I do.  

isdazope is very useful.  It can take care of restarting things so
that a typical crash lasts no more than 60 seconds, unattended.

> 
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