21:08
To: user@cassandra.apache.org
Subject: Re: Upgrade from C* 3 to C* 4 per datacenter
Just a heads-up, but there have been issues (at least one) reported when
upgrading a multi-DC cluster from 3.x to 4.x when the cluster uses node-to-node
SSL/TLS encryption. This is largely attributed to the
Just a heads-up, but there have been issues (at least one) reported when
upgrading a multi-DC cluster from 3.x to 4.x when the cluster uses
node-to-node SSL/TLS encryption. This is largely attributed to the fact
that the secure port in 4.x changes to 9142, whereas in 3.x it continues to
run on 9042
Hi,
as we are currently facing the same challenge (upgrading an existing cluster
from C* 3 to C* 4), I wanted to share our strategy with you. It largely is what
Scott already suggested, but I have some extra details, so I thought it might
still be useful.
We duplicated our cluster using the st
Hello Jeff et al,
Thanks a lot for your valuable info. Your comment covers all my queries.
BR
MK
From: Jeff Jirsa
Sent: October 26, 2023 15:48
To: user@cassandra.apache.org
Cc: Michalis Kotsiouros (EXT)
Subject: Re: Upgrade from C* 3 to C* 4 per datacenter
On Oct 26, 2023, at 12:32 AM
> On Oct 26, 2023, at 12:32 AM, Michalis Kotsiouros (EXT) via user
> wrote:
>
>
> Hello Cassandra community,
> We are trying to upgrade our systems from Cassandra 3 to Cassandra 4. We plan
> to do this per data center.
> During the upgrade, a cluster with mixed SW levels is expected. At thi
@cassandra.apache.org
Cc: user@cassandra.apache.org; Michalis Kotsiouros (EXT)
Subject: Re: Upgrade from C* 3 to C* 4 per datacenter
The recommended approach to upgrading is to perform a replica-safe rolling
restart of instances in each datacenter, one datacenter at a time.
> In case of an upgr
The recommended approach to upgrading is to perform a replica-safe rolling restart of instances in
each datacenter, one datacenter at a time. > In case of an upgrade failure, would it be possible
to remove the data center from the cluster, restore the datacenter to C*3 SW and add it back to
clu
