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From Daniel Josefsson <>
Subject Re: Upgrading from 0.6 to 0.7.0
Date Fri, 21 Jan 2011 09:20:56 GMT
No, what I'm thinking of is having two clusters (0.6 and 0.7) running on
different ports so they can't find each other. Or isn't that configurable?

Then, when I have the two clusters, I could upgrade all of the clients to
run against the new cluster, and finally upgrade the rest of the Cassandra

I don't know how the new cluster would cope with having new data in the old
cluster when they are upgraded though.


2011/1/20 Aaron Morton <>

> I'm not sure if your suggesting running a mixed mode cluster there, but
> AFAIK the changes to the internode protocol prohibit this. The nodes will
> probable see each either via gossip, but the way the messages define their
> purpose (their verb handler) has been changed.
> Out of interest which is more painful, stopping the cluster and upgrading
> it or upgrading your client code?
> Aaron
> On 21/01/2011, at 12:35 AM, Daniel Josefsson <> wrote:
> In our case our replication factor is more than half the number of nodes in
> the cluster.
> Would it be possible to do the following:
>    - Upgrade half of them
>    - Change Thrift Port and inter-server port (is this the storage_port?)
>    - Start them up
>    - Upgrade clients one by one
>    - Upgrade the the rest of the servers
> Or might we get some kind of data collision when still writing to the old
> cluster as the new storage is being used?
> /Daniel

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