On Wed, 9 Nov 2011 20:34:11 +0300, dokondr wrote:

I am wondering if Database.Persist can work with key/value storage such as Riak or SimpleDB where records are lists of key/value pairs and any two lists can have different keys? Is simple implementation of 'persistent' based on files with key/value records possible? For example 'persistent' based on KyotoCabinet package? (http://hackage.haskell.org/package/KyotoCabinet)http://hackage.haskell.org/package/KyotoCabinet

As far as I know, persistent doesn't depend on any particular backend, but as far as NoSQL-stuff goes, I think there's only persistent-mongodb at the moment. I don't know how much work it is to create a new backend (and if it's worth the effort in your case), but this looks like a good place to start: http://hackage.haskell.org/packages/archive/persistent/0.6.4/doc/html/Databa... Cheers, Daniel

On Wed, Nov 9, 2011 at 8:41 PM, Bas van Dijk wrote:

On 9 November 2011 11:59, dokondr wrote:

...

What Haskell package to work with NoSQL storage is both mature and easiest to use? I need persistent storage for simple key/value lists (not complex JSON docs).

If your data fits in RAM then acid-state is also an option:

http://hackage.haskell.org/package/acid-state

It's used as the storage library for the new hackage server.

I need to share data across processes running both on the same node or different nodes. Every process has its own memory space. Can acid-state memory be shared between several system processes?

TCache manages persistent data trough STM references called DBRefs that are very similar to TVars, but with added user-configurable persistence. Very intuitive to use. 2011/11/9 Bas van Dijk :

On 9 November 2011 19:50, dokondr wrote:

...

On Wed, Nov 9, 2011 at 8:41 PM, Bas van Dijk wrote:

...

On 9 November 2011 11:59, dokondr wrote:

...

What  Haskell package to work with NoSQL storage is both mature and easiest to use? I need persistent storage for simple key/value lists (not complex JSON docs).

If your data fits in RAM then acid-state is also an option:

http://hackage.haskell.org/package/acid-state

It's used as the storage library for the new hackage server.

I need to share data across processes running both on the same node or different nodes. Every process has its own memory space. Can acid-state memory be shared between several system processes?

I believe so:

http://hackage.haskell.org/packages/archive/acid-state/0.6.0/doc/html/Data-A...

but maybe David can tell you more about that.

Cheers,

Bas

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