[erlang-questions] auto-syncing mnesia after a network split

Andrew Stone <>
Mon Dec 8 20:00:14 CET 2008


Another question to ask is whether you actually need a relational DB at all for your internet site. CouchDB seems to have solved the replication issue quite elegantly.

-Andrew



----- Original Message ----
From: Joel Reymont <>
To: Jim McCoy <>
Cc: Erlang Questions <>
Sent: Monday, December 8, 2008 12:37:44 PM
Subject: Re: [erlang-questions] auto-syncing mnesia after a network split


On Dec 8, 2008, at 5:19 PM, Jim McCoy wrote:

> To maintain the current properties of mnesia I believe the only option
> would be to add some complexity on the mechanics of the join mechanism
> (e.g. a quorum system like paxos to decide membership and agreement
> among the nodes as to the minimum quorum below which a partitioned
> subset is read-only) and a bit of work to change a minority subset
> into read-only mode when a partition is discovered.


I'm willing to take a shot at the work, with proper instruction and  
guidance.

I really really want a fix for this issue. I don't see how Mnesia can  
be used as the backend for an internet site otherwise. It's currently  
impossible to run an ecommerce or other internet site on top of Mnesia  
because of the split/rejoin issue. Please show me where I am mistaken.

My understanding is that this issue can be dealt with in the telecom  
industry due to the transient nature of the data. I'm guessing that  
really important data always goes into Oracle, PostgreSQL, etc.

Yes, I can use PostgreSQL or MySQL instead of Mnesia but then I have  
to deal with replication issues on that end. Does anyone know how  
other databases deal with network splits in a multi-master scenario?

    Thanks, Joel

--
http://wagerlabs.com

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