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    <p>You can do that but essentially you are developing your own replication engine. Those things can be a bit tricky to get right (what happens if m1 and m3 are executed on replica r1, but m2 isn't?) I wouldn't want to develop something like that unless you are sure you have the resources to make it work.</p> <p>I would look into existing off-the shelf replication solution. If you are already using a SQL DB it probably has some support for it. Look <a href="http://dev.mysql.com/doc/refman/5.0/en/replication.html" rel="nofollow">here</a> for more details if you are using MySQL</p> <p>Alternatively, if you are willing to explore other backends, I heard that CouchDB has great support for replication. I also heard of people using git libraries to do that sort of thing.</p> <p><strong>Update</strong>: After your comment, I realize you already use MySql replication and are looking for solution for re-syncing the databases after being offline. </p> <p>Even in that case RabbitMQ doesn't help you at all since it requires constant connection to work, so you are back to square one. Easiest solution would be to just write all the changes (SQL commands) into a text file at a remote location, then when you get connection back copy that file (scp, ftp, emaill or whatever) to master server, run all the commands there and then just resync all the replicas.</p> <p>Depending on your specific project you may also need to make sure there are no conflicts when running commands from different remote location but there is no general technical solution to this. Again, depending on the project, you may want to cancel one of the transactions, notify the users that it happened and so on.</p>
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    1. POoffline web application design recommendation
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    1. USGregory Mostizky
    1. USGregory Mostizky
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    1. COBTW RabbitMQ requires constant connection to work. You can work around this by creating a local buffer of messages and then pushing them all to server once you have connection.
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      1. USGregory Mostizky
    2. COAgreed. Also, there has to be a conflict resolution code. What happens if client 1 and client 2 have modified record 1 offline and then synced? Whose change "wins"? If manual resolution is required, how's that handled?
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      1. USSrdjan Pejic
    3. COthx for you help, I'm using mysql replication, but when I go into offline mode, i'm obliged to stop replication, since the slave (witch is the mysql local copy). Now this replication is very slow specially with a big database. don't know rabbitmq is the good solution or no ?
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      1. USSlim Tekaya
 

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