[erlang-questions] Amazon S3 backend for Mnesia

Roberto Saccon <>
Mon Jun 4 16:04:49 CEST 2007

Interesting. A while ago I wrote a very, very simple S3 Erlang adapter (no
transactions, no locking).  Is your work part of an open source project ?


On 6/4/07, Joel Reymont <> wrote:
> On Jun 4, 2007, at 1:04 PM, Ulf Wiger (TN/EAB) wrote:
> > But you basically only need to do this if it's
> > important for you to amortize the updates. It might
> > be important in other cases _not to_, e.g. if you
> > have other readers of the custom backend. In that case,
> > data wouldn't be visible after a commit, but only after
> > the next log dump, which might result in inconsistencies
> > at the application level.
> I can now reveal that I'm working on a Amazon S3 backend for Mnesia.
> The goal is to add transactions and locking, as well as make the data
> just written to S3 available right away.
> S3 provides neither transactions nor locking. Data written to S3 may
> become available for reading at some point in the future. S3 is
> conceptually a bunch of ets tables, at least I think it can be viewed
> this way.
> I'm looking to have a bunch of Mnesia nodes up and a bunch of
> s3_copies tables on each.
> Whenever data is written to one of the Mnesia nodes, I'm looking to
> have _that_ node commit the data to S3 and replicate it to other
> nodes as Mnesia does normally. I would also keep a cache of most
> recently written data in a regular Mnesia table.
> I understand that Synapse added a bdb_copies type of table and found
> this hard to maintain. Would rdbms be easier to maintain in my scenario?
>         Thanks, Joel
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Roberto Saccon
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