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The "CompatibilityGuarantees" page has been changed by SylvainLebresne: https://wiki.apache.org/cassandra/CompatibilityGuarantees?action=diff&rev1=1&rev2=2 == Downgrading == - Downgrading is only guaranteed within minor releases and only to the previous bug-fix release (odd-numbered ones). So for instance, if you upgrade from 3.3 to 3.4 and have a problem, you can downgrade to 3.3, but not necessarily to 3.1. If you upgrade from 3.4 to 3.5, then you’ll be able to downgrade to both 3.4 or 3.3, but not necessarily any previous release. + Downgrading is only guaranteed within minor releases and only to the previous bug-fix release (odd-numbered ones). So for instance, if you upgrade from 3.3 to 3.4 and have a problem, you can downgrade to 3.3, but not necessarily to 3.1. If you upgrade from 3.4 to 3.5, then you’ll be able to downgrade to both 3.4 or 3.3, but not necessarily any previous release. Furthermore, we don't guarantee commit log replay when downgrading at this point so if you decide to downgrade a node, you _must_ drain that node first. We don’t provide downgrading guarantees between major releases: this is why is it crucial to test those updates carefully, and to keep a pre-upgrade snapshot of every node until your upgrade is complete and you haven’t noticed any major problem.
