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 ________________________________ The information in this Internet Email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this Email by anyone else is unauthorized. 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