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From Santal Li <>
Subject Re: I am looking for cross data center HA solution
Date Wed, 14 Oct 2009 13:38:24 GMT
Thanks for your quickly response, and also excellent job on this project.

For such kind of HA, we need do 2 way data sync. After failover to DC2, the
data change will be replicate to DC1 again, we had done same work with our
cross DC file system HA solution, so I prefer to this solution at beginning.

Thanks for your suggestion, I think you are right, you guys do very good job
on the replication & failover with Cassandra, it was one of the best part of
this project. So let me try it. Thanks again.


2009/10/14 Jonathan Ellis <>

> On Wed, Oct 14, 2009 at 1:53 AM, Santal Li <> wrote:
> > There was another way for cross data center HA,  how about add some kind
> of
> > action hook, which can catch all the Cassandra.Iface function call(insert
> ,
> > batch_insert , remove ...) , then send the call to another Cassandra
> cluster
> > in remote data center? If so, there will be 1 Cassandra clusters in each
> 2
> > data centers, and have a extra application replicate data between the two
> > cluster. I prefer with this solution, because it looks more simple and
> > uncoupled 2 data center, BTW, from the source code, it looks was not very
> > hard to add a hook for this purpose , how do you think about it? is there
> > anyone meet the same requirements,  can you please give me some
> suggestion.
> That works fine, until you actually have a failure.  Then how do you
> re-sync your clusters after you've done some writes in the second DC?
> The advantage to letting Cassandra handle replication + failover is
> all the hard parts are done already. :)
> -Jonathan

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