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From Jonathan Ellis <>
Subject Re: Primary and Backup clusters
Date Mon, 03 May 2010 15:43:50 GMT
I suppose you could use rsync (sstable files are immutable, so you
don't need to worry about not getting a "consistent" version of the
data files), but compared to letting Cassandra handle the replication
the way it's designed to,

# you'll generate a lot of disk i/o doing that vs
# your backup cluster will miss a relatively large amount of the most
recent updates
# your failover process will be more error-prone

On Mon, May 3, 2010 at 8:05 AM, Viktor Jevdokimov
<> wrote:
> Hello,
> Our system (not Cassandra) have backup cluster in different datacenter in case of primary
cluster unavailability or for software upgrades.
> 100% of traffic goes to primary cluster. We switch 100% traffic to backup cluster in
case above for a short time, then when issues are resolved, traffic is switched back to primary.
> We'd like to have primary and backup Cassandra clusters in different datacenters for
the same reasons.
> We do not want to have a high traffic between primary and backup datacenters.
> Now the questions:
> 1. How to sync Cassandra clusters (backup<->primary) with minimal traffic?
> 2. How to configure Cassandra in such case?
> Thanks,
> Viktor

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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