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<  Trapexit Forums  ~  Creating a mirror for a cluster of nodes
vsp
Posted: Tue Jul 27, 2010 3:45 pm Reply with quote
User Joined: 03 Mar 2010 Posts: 14
Hi,

I have a cluster of Erlang nodes running on a server. Each node hosts a few mnesia tables(some of them are fragmented) which are disc copies. There are various other applications running on each node such as http, logger, inets, etc.
So far so good...

What i am worried about is the situation when one or more nodes go down. To avoid this i am thinking of a design such that each node is replicated/mirrored (with all the application and mnesia tables) at a different host such that everything is in sync ( I don't mind the delay for the mnesia write over network). So for nodes A, B and C on say Machine1, i want to have A1, B1, C1 on Machine2 such that A-A1, B-B1 and C-C1 are in sync all the time.

Any suggestions as in how to achieve this efficiently?

Thanks
Ram
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dudefrommangalore
Posted: Sun Oct 10, 2010 5:02 am Reply with quote
Joined: 25 Dec 2008 Posts: 2
Replicating Mnesia is a very easy task. You can configure Mnesia database/table to replicate it on multiple machines via mnesia:add_table_copy/3 function.

http://www.erlang.org/doc/man/mnesia.html#add_table_copy-3

Solution to you another problem of running a backup node is also solved by Erlang
Smile. Include all your applications you need and create your own application [ http://www.erlang.org/doc/design_principles/included_applications.html ]. Configure the newly created application as a distributed application [http://www.erlang.org/doc/design_principles/distributed_applications.html]. Voila! You have solved the problem with virtually no coding.
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