One of the capabilities of Couchbase Server is the ability to do online upgrades without downtime. This is in part due to Couchbase’s auto-sharding and rebalancing features. In this blog post we will walk through the recommended approaches of doing a rolling upgrade. While all of these approaches are possible ways of upgrading, they are listed in order of what is considers best practice. Preference is given to ease of operation, keeping the cluster and application online and operational, as well as consistent performance while the upgrade is happening.
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