July 2003 - Zope - Zope lists

Long running process
by Florian Reiser 17 Jul '03

17 Jul '03

Hi folks, I use Zope 2.6.0. I want to compute and display large pdf reports over the web. While computing the file, the browser times out. So I followed the following howto on zope.org: http://www.zope.org/Members/don/long_procces Because I want to display the pdf file directly after processing, my redirection page checks for a session variable called pdf and returns the content of the variable as pdf file, if found, else it returns a html page refreshing after 10 seconds. While debugging, I've found out, that the variable never gets set, when the browser times out, so the redirection page is looping forever checking for the resulting pdf code. Whats wrong? Can somebody plz help me, because I'm getting mad. Regards Florian Reiser

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Re: Handling of Multiple :list's
by Julian Clark 17 Jul '03

17 Jul '03

Hello again :list. Please ignore my previous email, I just realised how flawed my logic was. Better go back to the drawing board first. Sorry to be a bother. Julian ----- Original Message ----- From: "Julian Clark" <julcla(a)b-online.com.au> To: "zope" <zope(a)zope.org> Sent: Thursday, July 17, 2003 8:20 AM Subject: Handling of Multiple :list's Hello List, or should I say Hallo :List =) I'm trying to work out how to do, or even if it is possible, to handle two :lists within nested in statements... How would I make this reference the correct lists.   <dtml-call "REQUEST.set('amount',_['sequence-item'])"> // using amount list <dtml-call "REQUEST.set('dealer_no',_['sequence-item'])"> // using marketing list    Thanks Julian Clark

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RE: [Zope] Issue Tracker
by peter＠mail.grenna.net 17 Jul '03

17 Jul '03

As it is now, just download the gzipped file from Zope.org. It will be worth getting used to CVS for future releases if you need urgent bugfixes as they come to the CVS version faster than releases on Zope.org. Peter Original Message: ----------------- From: Christophe Cornil cco(a)clear2pay.com Date: Thu, 17 Jul 2003 13:42:47 +0200 To: zope(a)zope.org Subject: [Zope] Issue Tracker Hi all, I'm newbie in zope. I saw that there's an opportunity to use a issue tracker (http://www.zope.org/Members/peterbe/IssueTrackerProduct) But one thing I don't understand for the installation is the CVS stuff. What am I sensing to do? Browse the CVS Root? Install a CVS client and do something? Thanks -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .

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Memory Requirements and SQL Results
by Jim Kutter 17 Jul '03

17 Jul '03

I'm using Zope to interface with a MySQL back end storing files as BLOBs. For files in the neighborhood of 1MB+, I get MemoryError exceptions when I call my 'insert' SQL method. The file gets uploaded to Zope just fine, but inserting the body throws the exception. What is the best way to stuff potentially large amounts of data into an SQL database via Zope without fear of a MemoryError? -jim Here is my code (this is a python script which is the action of the input form - these are not in a product): (insert is a SQL method which takes mime_type, filename, data, length as parameters) request = container.REQUEST response = request.RESPONSE ... file = request.form['resource_file'] data = file.read() request.set('mime_type', file.headers['Content-type']) request.set('data', data) size = len(data) request.set('length', size) filename = file.filename[file.filename.rindex('\\')+1:] request.set('filename', filename) context.insert()

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Re: [Zope] Zope hangs with no visible reason
by Jaroslav Lukesh 17 Jul '03

17 Jul '03

> Odesílatel: Jakub Wisniowski <jakub.wisniowski(a)euro.coig.pl> > Today was the second time when my Zope has hanged up. The same thing has > happened 6 days ago. > I've never got problems with stability since I have moved from Zope > 2.6.1 back to 2.6.0. This was caused by experiencing a bug described in Collector > (Issue 852). > Here is some background: I run Zope 2.6.0 on Windows 2000 server. Hi, I was have Zope 2.5.1 at W2k server too. It hangs or deads without any message to logs manytimes. Now I run my zope under Linux without any problem (cca 120 days). Regards JL.

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KeywordIndex: Find empty list?
by Thomas Güttler 17 Jul '03

17 Jul '03

Hi! Is it possible to find the objects which have an empty list with a KeywordIndex? If I search for {myattribute:[]} I get all objects returned. thomas

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no 'operator' query option with zctextindex?
by Richard Ettema 17 Jul '03

17 Jul '03

Hi, I'm currently upgrading a site to run on 2.6.1 (previously 2.5.1). I have been testing the search facility with textindex replaced with zctextindex. ZCTextIndex Settings: 1. Okapi BM25 Rank Lexicon Settings: 1. Splitter 2. CaseNormalizer 3. StopWordAndSingleCharRemover If I do a search on the text 'bike helmet' (without quotes) I would like any item with the word 'bike' or 'helmet' to be returned. (An 'OR' search by default). The user has the ability to choose a drop-down for "any words" or "all words" to over-ride the default to an "OR" or "AND". This passes the chosen 'operator' to the catalog with {'query':'bike helmet', 'operator':'or'}. ZCTextIndex only returns items matching the whole phrase "bike helmet", the original textindex worked fine by matching the individual words. I have found in zctextindex.py the query options available is only the 'query'. Is there a reason why zctextindex doesn't allow an operator to be passed like textindex? TextIndex was working fine, I am interested in using ZCTextIndex for its improved relevance scoring. Also a question about the relevance scoring. Is the relevance score of returned items available in the results, or something to pass to make them available? Thanks for your help with this. Richard --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com) Version: 6.0.493 / Virus Database: 292 - Release Date: 25/06/03

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Highly Available Zope
by David A. Riggs 17 Jul '03

17 Jul '03

From my understanding of ZEO, a single ZODB is shared between multiple Zope application clients, giving a performance boost by offloading onto the multiple app clients. This leaves the ZODB machine as a single point of failure. We've had success in the past using DRBD to make relational databases highly available across multiple machines, I'm curious if anyone has done something similar to make the ZODB highly available in this manner, or if I'm misunderstanding a part of ZEO which handles this single point of failure. Thanks! -- - David A. Riggs <lukewarm(a)ultrasoul.com>

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Re: [Zope] Zope Freezing up with multiple threads accessing objects.
by Etienne Labuschagne 17 Jul '03

17 Jul '03

At 09:21 PM 16/7/2003 +0200, you wrote: >Etienne Labuschagne wrote at 2003-7-16 00:48 +0200: > > ... > > The above is abbreviated, but I can send you a more verbose list with > stack > > traces for each step. I printed out the > > threading.currentThread().getName()s every step to check which threads > are > > doing what. > >I am not really interested in a detailed log :-) > >"Storage._transaction" is set in "tpc_begin" and reset in >"tpc_abort" and "tpc_finish". > >When the check "transaction is self._transaction" fails, >look at "self._transaction". >When is is None, then >someone (maybe a different thread) called "tpc_abort" or "tpc_finish" >or (not likely "tpc_begin" was not executed). >When it is not None, then its value specifies the transaction >that most recently executed "tpc_begin". This must be a different >thread (since there is one transaction per thread and "transaction" >is ours). > > >Dieter Hi there, Thanks again for the pointers above - I helped me find my problem. I made one critically wrong assumption: I assumed a piece of code that I called doesn't change any ZODB objects, so I need not call get_transaction().commit() or abort(). Well, the code DID change a Zope object! This had the wonderful side effect that the object stayed in the Transaction object. This would probably have the effect of causing a memory leak, but for one thing: since Transactions are identified according to thread ids, and thread ids are re-used after previous threads using them exited (well, in Windows anyway), new threads ended up using Transaction objects which still have uncommitted objects in them. These objects are then mixed with the new thread's changed objects which has the same effect as changing ZODB objects from multiple threads - (so you WERE right saying I changed objects from multiple threads! ;) I assume it is safe to call get_transaction().abort() if I'm not sure if the code changed anything and doesn't care if changes are lost? This is probably better than having unfinished transactions lurking around to bite me. Thanks again! Etienne

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Running an instance of Zope (with INSTANCE_HOME) as a windows service
by Sune W�ller 17 Jul '03

17 Jul '03

Hi all, i have been trying to set several instances of zope up on one server (each runningon a different port number or ip), and have succeeded in creating an instance following the recipe here: http://www.zope.org/Members/4am/instancehome This means that each instance runs on the same zope-install, but with each their own data, products etc. (still dont know what to do about zope.cgi, though) But i would like each instance to run as a service under windows 2k. Any suggestions ?? I'm running zope 2.6.1 is it possible to see the code for the install script (that registers the zope install as a service) somewhere ? greetings, Sune B. Woeller

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