- Zope - Zope lists

ZEO clusters on a single box
by Jean Jordaan 16 Aug '08

16 Aug '08

Hi there We have a server running many ZEO clusters (many more than the number of CPUs, of course). Each cluster consists of a master and two clients. Would it make sense to run both clients and spread requests across them? Or would it be better to just increase the number of threads of a single client, and only use the second client for './bin/zopectl debug', and for failover if the first client needs to be restarted? Would it ever make sense to have *more* than 2 clients per master, in this scenario (many more processes than CPUs)? So far, I've had the following response to my questions: """ [...] at every zope/plone conference there are people who claim that adding more threads makes no difference and that you should rather add more zeo clients, but my CS background says more threads can share memory and perform better. But for zope it seems that each threads maintains it's own cache anyway, so there is little memory sharing going on. You may as well run 10 clients with one thread each rather than one client with 10 threads, it would make little difference other than the overhead for the extra process, which is less than 100MB. I'm a little disappointed in zope's memory usage patterns. It doesn't really matter how much memory you have or what sorts of limits you impose, it seems zope always uses more and more until it consumes about 1GB of swap and starts killing the box. So you need to monitor RAM usage with nagios or something and restart the instance every so often. On some of our managed machines we restart zope about once an hour because of this. That just doesn't make good sense, you kill your cache every time. """ RTFM with pointers most appreciated. -- jean . .. .... //\\\oo///\\

3 2

Persistent Mapping error with TinyTablePlus.
by Ignacio Valdes 16 Aug '08

16 Aug '08

Hi Chris, When I try to change a Squishdot rightbox_items title or even not change anything and try to save it out I get this error thrown: Site Error An error was encountered while publishing this resource. NameError Sorry, a site error occurred. Traceback (innermost last): * Module ZPublisher.Publish, line 194, in publish_module_standard * Module Products.PlacelessTranslationService.PatchStringIO, line 34, in new_publish * Module ZPublisher.Publish, line 146, in publish * Module Zope2.App.startup, line 222, in zpublisher_exception_hook * Module ZPublisher.Publish, line 115, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 41, in call_object * Module Products.TinyTablePlus.TinyTablePlus, line 446, in manage_editData * Module Products.TinyTablePlus.TinyTablePlus, line 509, in _GenerateIndex NameError: global name 'PersistentMapping' is not defined (Also, the following error occurred while attempting to render the standard error message, please see the event log for full details: 'standard_html_header')

2 1

Zope capacity planning
by Ricardo Bánffy 13 Aug '08

13 Aug '08

Hi folks. I was giving a class on Zope/Plone administration and one of the students asked about an "official" guide on Zope capacity planning. I searched zope.org, asked all mighty Google and wandered through both the darkest and lightest sites that say things about Zope with no success. Is there such a thing? Is there any reference these students can point to when they say they need half-a-ton of servers to serve their requests?

2 1

Re: [Zope] Script (Python) insecure ?
by Garito 12 Aug '08

12 Aug '08

The same question again and again As a Zope user I prefer to know as soon as possible if Zope has security problems like those Perhaps the correct way will be to send the problem to the zope people and 2 weeks later then make it public I think 2 weeks is a very correct period to solve a problem if not, I want to try to solve the problem for myself But I shout my mouth, sorry Andreas ;) 2008/8/12 Andreas Jung <lists(a)zopyx.com> > *sigh* > > I wished that both exploits were reported to the Zope bugtracker in order > to work on solutions before making the exploits public. > > > --On 12. August 2008 13:41:04 +0200 "M.-A. Lemburg" <mal(a)egenix.com> > wrote: > > Hello, >> > > > > >> 1. Attack: >> >> Put this into a "Script (Python)" object and run it: >> >> return 'kaboom'.encode('test.testall') >> >> This results in a denial-of-service, since Zope will hang >> running the Python test suite. >> >> The reason for this is a problem in the way the encoding search >> function works in Python 2.4. This was changed in 2.5 to no longer >> allow searching for codecs outside the encodings package. >> > > That's pretty obscure behavior of Python 2.4...anyway. > > > >> >> 2. Attack: >> >> Put this into a "Script (Python)" object and run it: >> >> raise SystemExit >> >> This shuts down Zope. >> >> The Python Script environment should obviously catch such exceptions >> and not let them propagate up the call stack. >> >> > See the followup on > > <https://bugs.launchpad.net/zope2/+bug/257269> > > There is a patch available that solves the problem. > > Andreas > > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://mail.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://mail.zope.org/mailman/listinfo/zope-announce > http://mail.zope.org/mailman/listinfo/zope-dev ) > > -- Mis Cosas http://blogs.sistes.net/Garito Zope Smart Manager http://blogs.sistes.net/Garito/670

5 4

Re: [Zope] Page Template help
by Garito 12 Aug '08

12 Aug '08

Use: /path/to/the/object/with/${some/magic/variables}/to/solve/some/paths/in/a/simplest/way You could do that converting the path above to python: path(path('string:' + '/path/to/the/object/with/${some/magic/variables}/to/solve/some/paths/in/a/simplest/way')) or in a generic way: python: path(path('string:' + expr)) No more than 5 o 6 lines changed and a lot of code saved 2008/8/11 Andreas Jung <lists(a)zopyx.com> > > > --On 11. August 2008 15:48:21 +0200 Garito <garito(a)sistes.net> wrote: > > Hi Philipp! >> Thank you so much for your response but in this lines is were the engine >> loads the possibilities but not were evaluate the current expression >> >> I would like to evaluate some condition before to load the class who >> resolves the expression (and witch is loaded in the code you point me) >> >> > Sounds strange to me. Usecase? > > -aj -- Mis Cosas http://blogs.sistes.net/Garito Zope Smart Manager http://blogs.sistes.net/Garito/670

3 9

Re: [Zope] Page Template help
by Garito 11 Aug '08

11 Aug '08

Hi Philipp! Thank you so much for your response but in this lines is were the engine loads the possibilities but not were evaluate the current expression I would like to evaluate some condition before to load the class who resolves the expression (and witch is loaded in the code you point me) More clear? Thanks! 2008/8/11 Philipp von Weitershausen <philipp(a)weitershausen.de> > Garito wrote: > >> Could someone point me where the page template code decide if an >> expression is a path expression or a string or python one, please? >> >> I'm studying the zope page template classes and I would like to understand >> where this decision is taken >> > > Products.PageTemplates.Expressions.createZopeEngine(): > > for pt in ZopePathExpr._default_type_names: > e.registerType(pt, ZopePathExpr) > > ZopePathExpr._default_type_names contains, among others, the name > 'standard', which makes this expression type the default expression type. > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://mail.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce > http://mail.zope.org/mailman/listinfo/zope-dev ) > -- Mis Cosas http://blogs.sistes.net/Garito Zope Smart Manager http://blogs.sistes.net/Garito/670

2 1

Thesaurus / ontology / taxonomy support in Zope-Plone
by Benjamin Michiels 11 Aug '08

11 Aug '08

Hi, (I'm new to Zope and Plone, so don't hesitate to indicate me a more appropriate mailing-list if necessary) I am curently looking for a library (idealy, ready-for-Plone3.x-Zope2.10) allowing the creation and management of a thesaurus. Our requirements are the following: - creation of our own thesaurus (that is, terms AND relations between terms), and indexing (and retrieving) documents with terms defined in our thesaurus, - "thesauraus management facilities", such as batch editing of content items (e.g. for all documents indexed by keyword "A" and "B", replace keywords "A" and "B" by keyword "C"). - user-friendly interface. This could a be tree-like structure (with - ideally - several levels of indexing), such as: Shape - TS: Square + TS: Triangle - TS: Scalene triangle + TS: Equilateral triangle - [...] - [...] - [...] - [...] After some - basic - searches, it appears that there are not many thesaurus management developed for Plone/Zope (and maybe even in python) yet, but as I'm new to Zope-Plone, I may be mistaking: - PloneOntology looked interesting (http://plone.org/products/ploneontology) but is it still maintened (no release for one year)? - icSemantic / pyThesaurus (http://plone.org/products/icsemantic-thesaurus http://www.platecom.com/) looks promising but there isn't much documentation and the website is only in Spanish for the moment). - Tabajara (http://plone.org/products/tabajara) looks like a dead project (only works for Plone 2.1??). - I don't think Portal Taxonomy (http://plone.org/products/portal_taxonomy) or AT Vocabulary Manager (http://plone.org/products/atvocabularymanager) are suited for thesaurus - pyWordNet (http://osteele.com/projects/pywordnet/index.html) appears to be more a back-end to WordNet thesaurus than a thesaurus mangement tool. - so far, TextIndexNG3 (http://www.zopyx.de/projects/TextIndexNG3) looks the most promising, event if it doesn't appear to offer thesaurus management tools yet... What do you think of it and/or is there already a discussion on this topic? Thank you in advance, Benjamin Michiels -- Software AG Benelux

3 2

ZClasses deprecation and upgrades
by Behrens Matt - Grand Rapids 11 Aug '08

11 Aug '08

I am wondering about is the nature of the problems with ZClasses that led to their deprecation. If I move a 2.5.1 installation to 2.11, are my several existing ZClass-based products going to break in any known way I should be aware of? Should I consider a last-known-good upgrade target instead? Not really looking for ironclad assurances so much as general experience here.

2 1

Re: [Zope] Asking advice on best way to perform an interaction with an external webservice
by Marco Bizzarri 03 Aug '08

03 Aug '08

On Sat, Aug 2, 2008 at 11:36 AM, Andreas Jung <lists(a)zopyx.com> wrote: > > > --On 2. August 2008 10:11:10 +0200 Marco Bizzarri <marco.bizzarri(a)gmail.com> > wrote: > >> Dieter, thanks for your answer. >> >> I've to implement a SOAP client, and I wonder how to interact with >> the external webservice from a transactional point of view: I don't >> want to call twice the same service because of ZPublisher redoing >> transactions, and this sort of things. > > The transaction module or the ZODB provides a post-commit hook. > > -aj Thanks Andreas; I assume the post-commit hook is not available in the Zope 2.8 world, am I right? (In the meantime, Marco writes another "+1" to the item on his checklist named "porting to Zope 2.10") -- Marco Bizzarri http://iliveinpisa.blogspot.com/

1 0

Asking advice on best way to perform an interaction with an external webservice
by Marco Bizzarri 02 Aug '08

02 Aug '08

Hi all. I need to implement an interaction with an external web service. The external webservice basically can either provide or accept messages from my zope application. The messages are either produced by my application (and need to be "sent" to the external application via web service) or produced by the external application, and must be processed by mine. I'm asking then for best practice for this sort of interaction. Following what I have read in other threads, I would assume that, for example for sending, I should do something like: - create a queue of objects which needs to be sent, in one transaction; - sent the objects which need to be sent, in another transaction; The problem, of course, is to minimize (if not avoid at all) the chance to have a Conflict with a double sending of the message. In some sense, this is very close to sending an email via an smtp server, therefore, I assume I should at the right products to look for inspirations. Thanks you all for your time. Marco -- Marco Bizzarri http://iliveinpisa.blogspot.com/

3 3