Manish is correct. Upgrade the Cassandra version of a single node only. If that node is behaving as expected (i.e. is in an Up/Normal state and no errors in the logs), then upgrade the Cassandra version for each node one at a time. Be sure to check that each node is running as expected. Once the Cassandra version is upgraded on all nodes in the cluster and all nodes are in a healthy state, then you upgrade the SSTables.
As Manish has pointed out, you want to be able to rollback the Cassandra version easily if something goes wrong with the software upgrade. If you have the disk space, I recommend taking a snapshot of the SSTables on all nodes first before upgrading the Cassandra software version. The snapshots are a safe guard incase there is a major problem after upgrading SSTables. Regards, On Wed, 4 Mar 2020 at 15:08, manish khandelwal <manishkhandelwa...@gmail.com> wrote: > Should upgradesstables not be run after every node is upgraded? If we need > to rollback then we will not be able to downgrade sstables to older > version. > > Regards > Manish > > On Tue, Mar 3, 2020 at 11:26 PM Hossein Ghiyasi Mehr < > ghiyasim...@gmail.com> wrote: > >> It's more safe to upgrade one node before upgrading another node to avoid >> down time. >> After upgrading binary and package, run upgradesstables on candidate node >> then do it on all cluster nodes one by one. >> *-------------------------------------------------------* >> *VafaTech <http://www.vafatech.com> : A Total Solution for Data Gathering >> & Analysis* >> *-------------------------------------------------------* >> >> >> On Thu, Feb 13, 2020 at 9:27 PM Sergio <lapostadiser...@gmail.com> wrote: >> >>> >>> - 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) >>> - Nodetool drain on the node that needs to be stopped (seeds first, >>> preferably) >>> - 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) >>> - nodetool statusbinary to verify if it is up and running >>> - Repeat for all nodes >>> - Once the binary upgrade has been performed in all the 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. >>> >>> >>> >>> I added 2 points to the list to clarify. >>> >>> Should we add this in a FAQ in the cassandra doc or in the awesome >>> cassandra https://cassandra.link/awesome/ >>> >>> Thanks, >>> >>> Sergio >>> >>> >>> Il giorno mer 12 feb 2020 alle ore 10:58 Durity, Sean R < >>> sean_r_dur...@homedepot.com> ha scritto: >>> >>>> 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> >>>> *Sent:* Wednesday, February 12, 2020 11:36 AM >>>> *To:* 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. 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