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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