helo (Short introduction for those who does not know what is this about: gp-export is a tool to export/import databases in human-readable (SEXP) format, with serialization based on s-serialization of cl-prevalence, meant to work with different databases. In previous discussions it was considered as a path of migration between version 0.9 and 1.0 of elephant/postmodern.)
Just a few monthes passed, and I've made gp-export that is suitable for migration from 0.9 to 1.0. :) The problem was that there was no support for btrees whatsoever, so I had to refactor it badly. Anyway, now it seems to work and it even has some tests. However, for now gp-export does not back up whole store -- it only iterates through all objects it finds in index and dumps them together with all their slots etc. It is such because it was meant to be working with various stores. (But it supports only elephant/postmodern so far.) But probably if we also backup store root as some fake object instance, it would make full elephant store backup. Also, there are some backend-specific pieces in exporter, such as what slots to filter out. I've only made support for postmodern, if one wants it to work with BDB, he needs to add support. Also, migration is backend-specific (as it needs to map between btree classes), maybe it needs some refactoring to be unified. So, the questions are: Is there a need for such thing? Are backups described above full/good enough? Should it be somehow bundled with elephant or maintained separately? Are there people who'd like to hack it to add support for different stuff? (Well, I can do this, but I'm not very fast :) ) By the way, besides gp-export, I've considered using elephant's migration for 0.9 to 1.0 upgrade: postmodern-0.9 --migration--> bdb-0.9 --upgrade--> bdb-1.0 --migration--> postmodern-1.0 However, migration does not work right in version 0.9... And I'm not very enthusiastic about digging old code. I've asked about this some time ago, as nobody replied I'm assuming nobody cares, so I'm officially giving up. with best regards, Alex 'killerstorm' Mizrahi. _______________________________________________ elephant-devel site list elephant-devel@common-lisp.net http://common-lisp.net/mailman/listinfo/elephant-devel
