Hello Shane, This is some tinkering about whether/how it is possible to make a ZODB storage that uses a simple kev-value database (KVDB) (e.g. tokyo tyrant). A KVDB that is persistent on disk or even replicated should not be less fault tolerant as MySQL.
As I see you got the caching right with memcached in relstorage. That is also a step further on this direction. Problems that I see: - read/write separation: as the KVDB does not have transactions, reads should not overlap with writes. That should easily be possible with locking. (Yah, that does not make it so shiny anymore.) Either DB global or fine-grained on the oid level. That would maybe require a separate service that does the locking? - loadBefore: it's a good question how to solve that easily/speedy without lots of requests to the KVDB with the KVDB's reduced set of features. - performance: my fear is that getting this right could be slower as relstorage/ZEO. Because of the mismatches between the requirements of a ZODB storage and the features of the simple KVDB. There is also an S3 storage out there, by Laurence: http://code.google.com/p/s3storage/ Jim is working on zc.bsddbstorage, where BerkeleyDB should be (sofar I see -- but never used it) also a (not that minimal) KVDB. I'd like to personally chase these ideas, but I don't think I'll get some time soon. Also I guess you have a deeper knowledge about storages. -- Best regards, Adam GROSZER mailto:agros...@gmail.com -- Quote of the day: Baseball is a skilled game. It's America's game -- it, and high taxes. _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
