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docs/Cluster-VictoriaMetrics.md: clarify the issue with multi-level cluster, which may result in data gaps at some AZs

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Aliaksandr Valialkin 2022-04-16 13:03:39 +03:00
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@ -343,7 +343,7 @@ Then [promxy](https://github.com/jacksontj/promxy) could be used for querying th
The multi-level cluster setup for `vminsert` nodes has the following shortcomings because of synchronous replication and data sharding:
* Data ingestion speed is limited by the slowest link to AZ.
* The cluster stops receiving new samples as soon as at least a single AZ becomes unavailable.
* `vminsert` nodes at top level re-route incoming data to the remaining AZs when some AZs are temporariliy unavailable. This results in data gaps at AZs which were temporarily unavailable.
These issues are addressed by [vmagent](https://docs.victoriametrics.com/vmagent.html) when it runs in [multitenancy mode](https://docs.victoriametrics.com/vmagent.html#multitenancy). `vmagent` buffers data, which must be sent to a particular AZ, when this AZ is temporarily unavailable. The buffer is stored on disk. The buffered data is sent to AZ as soon as it becomes available.