Re: [ZODB-Dev] getExtensionMethods
On Sunday 14 May 2006 21:52, Jim Fulton wrote: Toby, this is almost certainly a question for you. :) Can someone explain to me why getExtensionMethods is needed in the storage API? It's not used by anything in ZODB. ZEO proxies the standard storage API. The original requirement is for ZEO to support storages which expose extended functionality via an extended API. DirectoryStorage uses this to allow control of its snapshot mode. I'm incluned to remove it, It would be mildly disappointing if there was no way of accessing an extended storage API over ZEO. However I have no concerns about seeing getExtensionMethods replaced with some alternative mechanism (possibly more complex for the consumer(s) of this extended API, if that makes it more sustainable within ZEO) References: First proposed here... http://mail.zope.org/pipermail/zodb-dev/2002-May/002704.html and an implementation discussed in the thread starting here... http://mail.zope.org/pipermail/zodb-dev/2002-September/003209.html -- Toby Dickenson ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
[ZODB-Dev] DirectoryStorage 1.1.17
I am pleased to announce the release of DirectoryStorage, version 1.1.17. Over the last few months DirectoryStorage has been languishing at 'release candidate' status, so this is the first release badged 'stable' to include Zope 3 support (thanks to Philipp von Weitershausen), NTFS support (thanks to Enfold Systems and Mark Hammond), and numerous small improvements to replication and backup tools. http://dirstorage.sourceforge.net/ What is DirectoryStorage? An alternative storage for ZODB that uses ordinary files and directories to store revisions of ZODB objects; one file per revision per object. Designed to be robust, manageable, fault tolerant, and scalable. ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
[ZODB-Dev] DirectoryStorage 1.1.16 (release candidate)
I am pleased to announce the release candidate for DirectoryStorage version 1.1.16. This version includes support for Zope 2.8 and Zope 3. http://dirstorage.sourceforge.net/ What is DirectoryStorage? An alternative storage for ZODB that uses ordinary files and directories to store revisions of ZODB objects; one file per revision per object. Many thanks to Philipp von Weitershausen for the Zope 3 support. This is a release candidate, aiming for final release before the end of the month. works-for-me emails to [EMAIL PROTECTED] are appreciated. ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] [Enhancement] Common cache for mounted connections
On Friday 30 September 2005 11:40, Dieter Maurer wrote: We have the need to mount dozens, if not hundreds of ZODBs in a single Zope instance. With the current implementation, each ZODB connection has its own independent cache. This makes it very difficult to use the available memory efficiently for caching. As the caches are independent, a heavily used ZODB cannot use memory assigned to a lightly used ZODB. Each ZODB version also has its own cache. There is already a mechanism for ensuring that lightly used versions do not hold on to memory indefinitely. That should be much easier, and might just be adequate. One big disadvantage is that it does not enforce a strict upper limit on cache/memory usage, so memory usage will grow if all storages are frequently accessed. -- Toby Dickenson ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] ZODB memory problems
On Tuesday 31 May 2005 18:43, Shane Hathaway wrote: Jeremy Hylton wrote: It's really too bad that ZEO only allows a single outstanding request. Restructuring the protocol to allow multiple simulatenous requests was on the task list years ago, but the protocol implementation is so complex I doubt it will get done :-(. I can't help but think building on top of an existing message/RPC layer would be profitable. (What's twisted's RPC layer? pb; perspective broker. I thought that suggestion was crazy when Jeremey first presented it in his blog, but increasing exposure to other twisted tools makes it seem more reasonable. In short, Ive not yet been disappointed by anything coming from the twisted camp. ) Or at least something less difficult to use than asyncore. Do you think the RPC layer is the source of the problem? I feel like the way ZODB uses references in pickles is the main thing that slows it down. Even if you have a protocol that can request many objects at once, the unpickling machinery only asks for one at a time. Both problems seem interestingly non-trivial; a storage layer that will prefetch related pickles, and an rpc/storage layer that can express those prefetching requests with appropriate security, concurrency, and prioritization. -- Toby Dickenson ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
Re: [ZODB-Dev] Hanging ZEO-client hangs all other ZEO-clients?
On Thursday 14 April 2005 08:38, Dario Lopez-Kästen wrote: Chris Withers wrote: You sure you're using the latest DirectoryStorage? Can you reproduce this using just plain FileStorage? No, I am not using the latest, because of my *n*l sysadmin (actually there are two of them, but only one whines :-). I'll try beating him in the head a few times, er, I mean, discuss the issue with him to make him change his mind. If it helps, Im pretty sure that no deadlocking bugs have been fixed in directorystorage since version 1.1.4. 5) POSKeyErrors. We where getting quite a few of those, and that scared me. with DirStor, I do not see them as much as before. I would be interested to see if you are getting *any* unexpected POSKeyErrors with DirectoryStorage. -- Toby Dickenson ___ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
