> Can you confirm that, cause we'll add a new DC with version 1.2.13 
> (read-only) and we'll upgarde other DCs to 1.2.13 weeks later. We made some 
> tests and didn't notice anything. But we didn't test a node failure

Depending on the other version you may not be able to run repair. All nodes 
have to use the same file version, file versions are here 
https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/io/sstable/Descriptor.java#L52

Cheers

-----------------
Aaron Morton
New Zealand
@aaronmorton

Co-Founder & Principal Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com

On 14/01/2014, at 7:30 am, Robert Coli <rc...@eventbrite.com> wrote:

> On Mon, Jan 13, 2014 at 3:38 AM, Cyril Scetbon <cyril.scet...@free.fr> wrote:
> Can you confirm that, cause we'll add a new DC with version 1.2.13 
> (read-only) and we'll upgarde other DCs to 1.2.13 weeks later. We made some 
> tests and didn't notice anything. But we didn't test a node failure
> 
> In general adding nodes at a new version is not supported, whether a single 
> node or an entire DC of nodes.
> 
> =Rob
>  

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