IRC log of #zope3-dev for Monday, 2008-12-15

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regebroI'm trying to do some tests on what happens to a ZEO client when the connection to the server is dropped. No closed, but brutally dies.15:19
regebroDoes anybody have any idea of how to test that in a way that is unit testable? J1m?15:19
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jayarajregebro, there are some bugs in that area for sure. most of the 'logicaly correct' setups dont work in practice. like the second diagram in this blog http://blog.musmo.com/2008/04/25/multiple-zeo-servers-sharing-the-same-database/15:46
jayarajregebro, we have tesing it manually and the result was negetive... and it was few months ago.15:47
jayarajwe have been* tesing it...15:47
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regebroI don't think that setup makes much sense to be honest.15:48
regebroTwo servers talking to the same Data.fs? Nah.15:48
regebroBut that doesn't matter, this is a completely different issue.15:48
jayarajregebro, that setup was actually to add to reliability. the zope.conf has support for that too. and only one server will be used at a time and other one will be used only if first one is down15:51
J1mjayaraj, multiple zeo servers serving a single Data.fs is not a valid config.  It shouldn't even be allowed by FileStorage, which uses a file lock.15:51
J1mregebro, I'm not sure what you were asking for above.15:52
jayarajJ1m yea there will be locking issues. i know.15:52
regebroJ1m: Well, there are some bugs if a tcp connection gets dropped, by for example a firewall timing out.15:52
J1mI'll note though that, starting in ZODB 3.8, ZEO clients send keep-alive messages to servers periodically to help detect if connections are dropped in a way that would not normally be connected.15:53
regebroJ1m: OK, that's good, that would at least help to avoid the problem.15:53
regebroJ1m: Are there any tests for that? I couldn't find any.15:54
regebroAlso there seems to be a bug reported that the client goes to 100% when trying to reconnect, maybe that actually gets fixed by that too?15:55
J1mI havent' seen this problem for ZEO, but I had observed it recently in ZRS replication using a VPN and adding keep alives there solved the problem.15:56
J1mI have no idea how to write automated tests for this, since I have no idea how to reproduce the problem.15:56
J1mI haven't seen that bug report.15:56
J1mI havent' observed that, but I don't think I'd care if I had.15:57
jayarajJ1m, but <zeoclient> element supports multiple zeo servers, right?. and in my setup the data.fs is on glusterfs and that saves us from locking issue. and is there any other issue than locking?15:57
J1mjayaraj, yes, that has nothing to do with multiple servers using the same storage.15:58
J1mThis ability to use muiltiple servers is there to support replicated databases.15:58
regebroJ1m: OK, thanks.15:59
regebroUsing 3.8 with older versions of Zope shouldn't be a problem, right?15:59
jayarajJ1m, replicated in what way? drdb?15:59
jayarajor zeo-raid, or zrs16:00
J1mzrs or zeo-raid.16:00
jayarajok16:00
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J1mregebro, right16:01
regebrocool.16:01
J1mZODB 3.8 servers support ZODB 3.2 to ZODB 3.8 clients.16:01
jayarajthats nice16:01
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Vq^can pagelets be used to create a static number of nested views?16:39
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Vq^in the demos i've seen only one pagelet is imported in a template16:40
Vq^i would like to have a view that uses two other pagelets16:42
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nyoVq^: Not with standard implementation. But you can override its "publishTraverse" method to do further traversing17:07
nyo(because default BrowserPagelet inherits from BrowserPage that raises NotFound in its publishTraverse17:07
Vq^i've just found the addressbook example in z3c.formdemo and it seems to do what i want, with the exception that it creates the sub-pagelets in python-code17:10
Vq^but maybe thats something i got to live with?17:10
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mintsauceI'm trying to call a class, from within a class that's called by a page template, but i keep getting this error:19:24
mintsauceTypeError: unbound method method() must be called with Class instance as first argument (got SimpleViewClass from /Users/mintsauce/sandbox/browser/template.pt instance instead)19:24
mintsaucetfrom template.py the call is: otherfilename.Class.method(self)19:24
mintsaucewhat am i doing wrong?19:24
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Theuniyou have to call it on an instance19:27
Theuniah19:28
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Theuniyou're trying to pass self19:28
Theunibut self isn't an instance of Class or a subclass of it.19:28
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