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update multi-region guide, specify multi-level vmselect option (#3039)
* update multi-region guide, specify multi-level vmselect option Signed-off-by: Artem Navoiev <tenmozes@gmail.com> * add more references * Apply suggestions from code review Signed-off-by: Artem Navoiev <tenmozes@gmail.com> Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
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@ -42,11 +42,14 @@ Here is a Quickstart guide for [vmagent](https://docs.victoriametrics.com/vmagen
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You can use one of the following options:
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You can use one of the following options:
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1. Regional endpoints - use one regional endpoint as default and switch to another if there is an issue.
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1. Multi-level [vmselect setup](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multi-level-cluster-setup) in cluster setup, top-level vmselect(s) reads data from cluster-level vmselects
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2. Load balancer - that sends queries to a particular region. The benefit and disadvantage of this setup is that it's simple.
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* Returns data in one of the clusters is unavailable
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3. Promxy - proxy that reads data from multiple Prometheus-like sources. It allows reading data more intelligently to cover the region's unavailability out of the box. It doesn't support MetricsQL yet (please check this issue).
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* Merges data from both sources. You need to turn on [deduplication](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#deduplication) to remove duplicates
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4. Global vmselect in cluster setup - you can set up an additional subset of vmselects that knows about all storages in all regions.
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2. Regional endpoints - use one regional endpoint as default and switch to another if there is an issue.
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* The deduplication in 1ms on the vmselect side must be turned on. This setup allows you to query data using MetricsQL.
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3. Load balancer - that sends queries to a particular region. The benefit and disadvantage of this setup is that it's simple.
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4. Promxy - proxy that reads data from multiple Prometheus-like sources. It allows reading data more intelligently to cover the region's unavailability out of the box. It doesn't support MetricsQL yet (please check this issue).
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5. Global vmselect in cluster setup - you can set up an additional subset of vmselects that knows about all storages in all regions.
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* The [deduplication](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#deduplication) in 1ms on the vmselect side must be turned on. This setup allows you to query data using MetricsQL.
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* The downside is that vmselect waits for a response from all storages in all regions.
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* The downside is that vmselect waits for a response from all storages in all regions.
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