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doc: add upgrade/downgrade without downtime to FAQ (#2973)

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* doc: add upgrade/downgrade without downtime to FAQ

Added info on how to upgrade or downgrade VictoriaMetrics without downtime to FAQ
Based on reply https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2944#issuecomment-1207502038

* Udate pr

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Yurii Kravets 2022-08-15 11:28:39 +03:00 committed by GitHub
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@ -325,3 +325,15 @@ The query engine may behave differently for some functions. Please see [this art
## If downsampling and deduplication are enabled how will this work? ## If downsampling and deduplication are enabled how will this work?
[Deduplication](https://docs.victoriametrics.com/#deduplication) is a special case of zero-offset [downsampling](https://docs.victoriametrics.com/#downsampling). So, if both downsampling and deduplication are enabled, then deduplication is replaced by zero-offset downsampling [Deduplication](https://docs.victoriametrics.com/#deduplication) is a special case of zero-offset [downsampling](https://docs.victoriametrics.com/#downsampling). So, if both downsampling and deduplication are enabled, then deduplication is replaced by zero-offset downsampling
## How to upgrade or downgrade VictoriaMetrics without downtime?
Single-node VictoriaMetrics cannot be restarted / upgraded or downgraded without downtime, since it needs to be gracefully shut down and then started again. See [how to upgrade VictoriaMetrics](https://docs.victoriametrics.com/#how-to-upgrade-victoriametrics).
[Cluster version of VictoriaMetrics](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) can be restarted / upgraded / downgraded without downtime if the following conditions are met:
* If every component of the cluster - `vminsert`, `vmselect` and `vmstorage` - has at least 2 instances.
* If the cluster has enough compute resources (CPU, RAM, disk IO, network bandwidth) to perform rolling restart of all its components.
* If the version used for upgrade / downgrade is compatible with the currently running version. The [CHANGELOG](https://docs.victoriametrics.com/CHANGELOG.html) contains compatibility notes for the published releases.
See [updating / reconfiguring cluster nodes](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#updating--reconfiguring-cluster-nodes) for details on cluster upgrade.