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From Steve Neely <>
Subject Re: Migrating from a windows cluster to a linux cluster.
Date Thu, 24 May 2012 19:44:28 GMT
It also seems like a dark deployment of your new cluster is a great method
for testing the Linux-based systems *before* switching your mision critical
traffic over. Monitor them for a while with real traffic and you can have
confidence that they'll function correctly when you perform the switchover.

-- Steve

On Thu, May 24, 2012 at 1:28 PM, Brandon Williams <> wrote:

> On Thu, May 24, 2012 at 1:50 PM, Henrik Schröder <>
> wrote:
> > Ok. It's important for us to not have any downtime, so how about this
> > solution:
> >
> > We startup the Linux cluster independently.
> > We configure our application to send all Cassandra writes to both
> clusters,
> > but only read from the Windows cluster.
> > We run sstableloader on each windows server (Is it possible to do in
> > parallell?), sending whatever it has to the Linux cluster.
> > When it's done on all Windows servers, we configure our application to
> only
> > talk to the Linux cluster.
> That sounds fine, with the caveat that you can't run sstableloader
> from a machine running Cassandra before 1.1, so copying the sstables
> manually (assuming both clusters are the same size and have the same
> tokens) might be better.
> > The only issue with this is the timestamps of the data and tombstones in
> > each sstable, will they be preserved by sstableloader? What about
> deletes of
> > non-existing keys? Will they be stored in the Linux cluster so that when
> > sstableloader inserts the key later, it's resolved as being deleted?
> None of that should be a problem.
> -Brandon

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