Distribution with Mnesia

Ulf Wiger (ÄL2/EAB) <>
Tue Aug 12 09:52:25 CEST 2003


Marc,

If you want to have a very dynamic network of mnesia nodes,
I suggest you configure a few nodes to hold a disk copy of
the schema, and manage them with care. Then, you can connect
other nodes using the mnesia 'extra_db_nodes' feature.
These nodes will be "diskless" from mnesia's perspective, 
and may come and go at will... almost. If a diskless node
loses contact with one of the master nodes, it should 
unconditionally restart (mnesia, at least).

Running distributed erlang over SSL is probably a good idea.

/Uffe

-----Original Message-----
From: Marc Ernst Eddy van Woerkom
[mailto:]
Sent: Tuesday, August 12, 2003 04:32
To: 
Subject: Distribution with Mnesia


The features of Mnesia, as described in the docs, are remarkable.

But what exactly is its useful grade of distribution?

Is it just usuable for a well defined group (not changing too
much in time) of nodes that are kind of close together (e.g.
in the same corporate LAN or WAN?

The other extreme would be a kind of P2P setting,
with lots nodes that join and leave the net in an 
unpredictable fashion.

Or not so extme:

Would it allow connecting let's say 10 servers
via the internet?
Would inter node metadata flow be possible over
encrypted channels?

Regards,
Marc
 




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