DC's versions compatibility

[Carlos Alonso <in...@mrcalonso.com>]

Hi guys.

I have a very old cassandra cluster 1.2.19 and I'm looking to add a new
datacenter to it for analytics purposes in a newer version, let's say
2.1.8. Will those DC's communicate properly?

Regards

Carlos Alonso | Software Engineer | @calonso <https://twitter.com/calonso>

Re: DC's versions compatibility

[Carlos Alonso <in...@mrcalonso.com>]

Hi guys.

Thanks for your reply.

Is this because the versions are very far from each other (e.g. Different
major versions) Or as a rule of thumb, all nodes in a cluster, even in
different DC's MUST have the same version?

Regards

Carlos Alonso | Software Engineer | @calonso <https://twitter.com/calonso>

On 28 September 2015 at 19:13, Robert Coli <rc...@eventbrite.com> wrote:

> On Mon, Sep 28, 2015 at 5:29 AM, Carlos Alonso <in...@mrcalonso.com> wrote:
>
>> I have a very old cassandra cluster 1.2.19 and I'm looking to add a new
>> datacenter to it for analytics purposes in a newer version, let's say
>> 2.1.8. Will those DC's communicate properly?
>>
>
> As Jonathan suggests :
>
> 1) Upgrade your existing cluster to 2.1.X
> 2) Then add an additional DC for analytics
>
> =Rob
>
>

Re: DC's versions compatibility

[Robert Coli <rc...@eventbrite.com>]

On Mon, Sep 28, 2015 at 5:29 AM, Carlos Alonso <in...@mrcalonso.com> wrote:

> I have a very old cassandra cluster 1.2.19 and I'm looking to add a new
> datacenter to it for analytics purposes in a newer version, let's say
> 2.1.8. Will those DC's communicate properly?
>

As Jonathan suggests :

1) Upgrade your existing cluster to 2.1.X
2) Then add an additional DC for analytics

=Rob

RE: DC's versions compatibility

[SE...@homedepot.com]

You CAN run mixed versions in your cluster for a short time when you are upgrading. However, you will most likely not be able to run repairs or any other streaming operations (adding nodes, adding a DC, etc.) while in this state.

The advice below is correct. Upgrade your current ring to the version you need; then add the DC at the same version. This is the only way to be sure that the streaming required will work.


Sean Durity – Lead Cassandra Admin

From: Jonathan Haddad [mailto:jon@jonhaddad.com]
Sent: Monday, September 28, 2015 9:34 AM
To: user@cassandra.apache.org
Subject: Re: DC's versions compatibility

No, they won't.  Always run the same version across your cluster.

On Mon, Sep 28, 2015 at 5:29 AM Carlos Alonso <in...@mrcalonso.com>> wrote:
Hi guys.

I have a very old cassandra cluster 1.2.19 and I'm looking to add a new datacenter to it for analytics purposes in a newer version, let's say 2.1.8. Will those DC's communicate properly?

Regards

Carlos Alonso | Software Engineer | @calonso<https://twitter.com/calonso>

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Re: DC's versions compatibility

[Jonathan Haddad <jo...@jonhaddad.com>]

No, they won't.  Always run the same version across your cluster.

On Mon, Sep 28, 2015 at 5:29 AM Carlos Alonso <in...@mrcalonso.com> wrote:

> Hi guys.
>
> I have a very old cassandra cluster 1.2.19 and I'm looking to add a new
> datacenter to it for analytics purposes in a newer version, let's say
> 2.1.8. Will those DC's communicate properly?
>
> Regards
>
> Carlos Alonso | Software Engineer | @calonso <https://twitter.com/calonso>
>