[Zope-dev] Read only ZEO

[Chris McDonough]

You may want to ask these questions on the zodb-dev list instead of on
here... more likely to get the answers in a timely way..


----- Original Message -----
From: "Tim Hoffman" <timhoffman@cams.wa.gov.au>
To: "Dieter Maurer" <dieter@handshake.de>
Cc: <zope-dev@zope.org>
Sent: Monday, October 01, 2001 11:41 PM
Subject: Re: [Zope-dev] Read only ZEO


> HI Dieter
>
> I had a look at z2.py (it's actually -r) so any way I tried (not too
> successfully).
>
> I have zeo running with 2.4.1 I have a zss and 2 zeo clients.
> One running without -r switch and one running with -r
>
> In z2.py the -r switch is documented as follows
>
>   -r
>
>     Run ZServer is read-only mode. ZServer won't write anything to disk.
>     No log files, no pid files, nothing. This means that you can't do a
>     lot of stuff like use PCGI, and zdaemon. ZServer will log hits to
>     STDOUT and zLOG will log to STDERR.
>
> Well when running a zeo client with -r switch results in no log files
> being written
> and the log is written to STDOUT, but the ZEO client is definately not
> in readonly mode
> ie I can create and modify documents.  (It probably means it can;t cache
> to disk ;-)
>
> I need to track down where READ_ONLY flag is used.  There isn't an
> occurrance
> with the ZEO code, so unless the READ_ONLY capability is implemented
> higher up
> in the transaction service, thenI think it isn't going to work.
>
> This document http://www.amk.ca/zodb/zodb-zeo.html which is linked to on
> the Zeo Product page
> actually mentions using Zeo client in readonly mode. I wonder if anyone
> has actually done it?
>
> Tim
>
>
> Dieter Maurer wrote:
>
> >Tim Hoffman writes:
> > > In some of the overview documents discussing ZEO, there is reference
> > > to a ZEO client potentially mounted a ZSS in read only mode. (I want
> > > to have some ZEO's in read/write as well)
> >When you start Zope with the "-R" option (I think, look at
> >"z2.py"!), it is in read-only mode.
> >
> > > I have been trying to work out how this might be achieved
> > > but have pretty much drawn a blank, has anyone done this I
> > > have any idea how I might go about doing such a thing.
> >There is a patch at
> >
> >  <http://www.dieter.handshake.de/pyprojects/zope>
> >
> >which allows Zope to be started with a read only storage.
> >
> >Maybe, you can adapt it for ZEO.
> >
> >
> >Dieter
> >
>
>
>
>
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