I'm wondering if we're going about this slightly the wrong way. Let's take a look at CouchDB. CouchDB prefers to keep all data on the disk at all times. As docs (or items) are added to a database they extend that database, but never overwrite it. In addition all changes are written instantly to disk, with no in memory cache.
Here's what I'm thinking. We develop a new set of sequence compatible maps and vectors, that are immutable, yet stored on disk. Each vector/map would be stored in a separate file, and changes to this file would need to be serialized, but reading from the file could be performed co-currently. Instead of syncing in-memory structures to disk, the structures themselves are stored on disk. If the user wants to cache that data they must perform the caching themselves. I think I may give this a try tonight with vectors as a starting point. Timothy On Wed, Jun 23, 2010 at 3:26 PM, Daniel Werner <daniel.d.wer...@googlemail.com> wrote: > On Jun 22, 7:57 pm, Timothy Baldridge <tbaldri...@gmail.com> wrote: >> system it uses. Has anyone tried marrying the two system systems to >> create a truly persistent data primitive where any "updates" to a map >> is written to the disk? > > There has been an attempt at integrating STM transactions with DB > transactions, even including a patch, but sadly discontinued and very > outdated by now: > > http://groups.google.com/group/clojure/browse_thread/thread/aa22a709501a64ac > http://clojure.googlegroups.com/web/external_transactions.patch?hl=en&gda=-S5y8U0AAADrLV-d6p24hYFcam_S99IgyJE26GXST0R-7SyR1V01WgTsgF1Et-2mKd4f9I_2PzGxx-qQneGAYu2No43QZpeq5Tb_vjspK02CR95VRrtmeQ&gsc=RG-y6gsAAAB4ToW0PqQMv0ZY_YCRY_xk > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
