Version choices aside, I am an advocate for forward-only (in most cases). Here is my reasoning, so that you can evaluate for your situation: - upgrades are done while the application is up and live and writing data (no app downtime) - the upgrade usually includes a change to the sstable version (which is unreadable in the older version) - any data written to upgraded nodes will be written in the new sstable format + this includes any compaction that takes place on upgraded nodes, so even an app outage doesn't protect you - so, there is no going back, unless you are willing to lose new (or compacted) data written to any upgraded nodes
As you can tell, if the assumptions don't hold true, a roll back may be possible. For example, if the sstable version is the same (e.g., for a minor upgrade), then the risk of lost data is gone. Or, if you are able to stop your application during the upgrade process and stop compaction. Etc. You could upgrade a single node to see how it behaves. If there is some problem, you could wipe out the data, go back to the old version, and bootstrap it again. Once I get to the 2nd node, though, I am only going forward. Sean Durity -----Original Message----- From: Jeff Jirsa <jji...@gmail.com> Sent: Sunday, September 30, 2018 8:38 PM To: user@cassandra.apache.org Subject: [EXTERNAL] Re: Rolling back Cassandra upgrades (tarball) Definitely don’t go to 3.10, go to 3.11.3 or newest 3.0 instead -- Jeff Jirsa On Sep 30, 2018, at 5:29 PM, Nate McCall <zznat...@gmail.com> wrote: >> I have a cluster on v3.0.11 I am planning to upgrade this to 3.10. >> Is rolling back the binaries a viable solution? > > What's the goal with moving form 3.0 to 3.x? > > Also, our latest release in 3.x is 3.11.3 and has a couple of > important bug fixes over 3.10 (which is a bit dated at this point). > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org ________________________________ 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. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this Email are subject to the terms and conditions expressed in any applicable governing The Home Depot terms of business or client engagement letter. The Home Depot disclaims all responsibility and liability for the accuracy and content of this attachment and for any damages or losses arising from any inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other items of a destructive nature, which may be contained in this attachment and shall not be liable for direct, indirect, consequential or special damages in connection with this e-mail message or its attachment. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
