Hi Sergio,

We have a production cluster with vnodes=4 that is a bit larger than that, so 
yes it is possible to do so.  That said, we aren’t wedded to vnodes=4 and are 
paying attention to discussions happening around the 4.0 work and mulling the 
possibility of shifting to 16.

Note though, we didn’t just pick 4 based on blind faith.  There was work done 
to evaluate the state of our token distribution before and after.  It’s pretty 
much true of all the settings we have for C* (or anything else for that 
matter).  We started from a lot of helpful articles and docs and mail threads 
and JIRA issues, but then we evaluated to see what we thought of the results.  
It was the only way for us to start building up some understanding of the 
details.

From: Sergio <lapostadiser...@gmail.com>
Reply-To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Date: Wednesday, February 12, 2020 at 2:50 PM
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Subject: Re: [EXTERNAL] Cassandra 3.11.X upgrades

Message from External Sender
Thanks, everyone! @Jon 
https://lists.apache.org/thread.html/rd18814bfba487824ca95a58191f4dcdb86f15c9bb66cf2bcc29ddf0b%40%3Cuser.cassandra.apache.org%3E<https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.apache.org_thread.html_rd18814bfba487824ca95a58191f4dcdb86f15c9bb66cf2bcc29ddf0b-2540-253Cuser.cassandra.apache.org-253E&d=DwMFaQ&c=9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=OIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=GkUeet_u9KFI2OlzYvn34AhugRwTmQiTA-Rc9YYBFx8&s=Mwa2C1h8fwl0Qxfi75pISpAUVX18lhGVyHAjO8hwk3o&e=>
I have a side response to something that looks to be controversial with the 
response from Anthony.
So is it safe to go to production in a 1TB cluster with vnodes = 4?
Do we need to follow these steps 
https://thelastpickle.com/blog/2019/02/21/set-up-a-cluster-with-even-token-distribution.html<https://urldefense.proofpoint.com/v2/url?u=https-3A__thelastpickle.com_blog_2019_02_21_set-2Dup-2Da-2Dcluster-2Dwith-2Deven-2Dtoken-2Ddistribution.html&d=DwMFaQ&c=9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=OIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=GkUeet_u9KFI2OlzYvn34AhugRwTmQiTA-Rc9YYBFx8&s=jVKn-7nVIP3_zUh6LjYMG-X1KyUZPcIvV-m0Cy82Ttk&e=>?
 because from Anthony response what I got that this is just an example and 
vnodes = 4 it is not ready for production.
https://lists.apache.org/thread.html/r21cd99fa269076d186a82a8b466eb925681373302dd7aa6bb26e5bde%40%3Cuser.cassandra.apache.org%3E<https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.apache.org_thread.html_r21cd99fa269076d186a82a8b466eb925681373302dd7aa6bb26e5bde-2540-253Cuser.cassandra.apache.org-253E&d=DwMFaQ&c=9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=OIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=GkUeet_u9KFI2OlzYvn34AhugRwTmQiTA-Rc9YYBFx8&s=r5CPYag3chuqUfol7RR8NKj31MC27P-gONPzaKhkeJ4&e=>

Best,

Sergio


Il giorno mer 12 feb 2020 alle ore 11:42 Durity, Sean R 
<sean_r_dur...@homedepot.com<mailto:sean_r_dur...@homedepot.com>> ha scritto:
>>A while ago, on my first cluster

Understatement used so effectively. Jon is a master.



On Wed, Feb 12, 2020 at 11:02 AM Sergio 
<lapostadiser...@gmail.com<mailto:lapostadiser...@gmail.com>> wrote:
Thanks for your reply!

So unless the sstable format has not been changed I can avoid to do that.

Correct?

Best,

Sergio

On Wed, Feb 12, 2020, 10:58 AM Durity, Sean R 
<sean_r_dur...@homedepot.com<mailto:sean_r_dur...@homedepot.com>> wrote:
Check the readme.txt for any upgrade notes, but the basic procedure is to:

  *   Verify that nodetool upgradesstables has completed successfully on all 
nodes from any previous upgrade
  *   Turn off repairs and any other streaming operations (add/remove nodes)
  *   Stop an un-upgraded node (seeds first, preferably)
  *   Install new binaries and configs on the down node
  *   Restart that node and make sure it comes up clean (it will function 
normally in the cluster – even with mixed versions)
  *   Repeat for all nodes
  *   Run upgradesstables on each node (as many at a time as your load will 
allow). Minor upgrades usually don’t require this step (only if the sstable 
format has changed), but it is good to check.
  *   NOTE: in most cases applications can keep running and will not notice 
much impact – unless the cluster is overloaded and a single node down causes 
impact.



Sean Durity – Staff Systems Engineer, Cassandra

From: Sergio <lapostadiser...@gmail.com<mailto:lapostadiser...@gmail.com>>
Sent: Wednesday, February 12, 2020 11:36 AM
To: user@cassandra.apache.org<mailto:user@cassandra.apache.org>
Subject: [EXTERNAL] Cassandra 3.11.X upgrades

Hi guys!

How do you usually upgrade your cluster for minor version upgrades?

I tried to add a node with 3.11.5 version to a test cluster with 3.11.4 nodes.

Is there any restriction?

Best,

Sergio

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