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From "David Timothy Strauss" <>
Subject Re: Replicating data over the wan?
Date Wed, 31 Mar 2010 01:15:09 GMT
Your ConsistencyLevel will change the effect. If CL is low, inconsistency will temporarily
occur between the DCs. If CL is high, writes will have noticeably high latency.

-----Original Message-----
From: Erik Holstad <>
Date: Tue, 30 Mar 2010 17:49:17 
To: <>
Subject: Replicating data over the wan?

Is anyone using datacenter aware replication where the replication takes
place over the wan
and not over super fast optical cable between the centers?

Tried to look at all posts related to the topic but haven't really found too
much, only some things
about not doing that if using ZooKeeper and some other small comments.

What are the limitations for this kind of replication, what happens when the
writes are coming
in too fast for the replication to be done, assuming some kind of write
buffer for the replication?

Not really worried too much about the inconsistent state of the cluster,
just how well it would
work is this kind of environment.

Regards Erik

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