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docs: sync with cluster branch

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Aliaksandr Valialkin 2020-11-23 00:42:00 +02:00
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2
docs/CHANGELOG.md
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@ -6,6 +6,8 @@
```bash
snap install victoriametrics
```
* FEATURE: vmselect: add `-replicationFactor` command-line flag for reducing query duration when replication is enabled and a part of vmstorage nodes
are temporarily slow and/or temporarily unavailable. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/711
* FEATURE: vminsert: export `vm_rpc_vmstorage_is_reachable` metric, which can be used for monitoring reachability of vmstorage nodes from vminsert nodes.
* FEATURE: vmagent: add Netflix Eureka service discovery (aka [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config)).
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/851

5
docs/Cluster-VictoriaMetrics.md
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@ -335,8 +335,9 @@ In order to enable application-level replication, `-replicationFactor=N` command
This guarantees that all the data remains available for querying if up to `N-1` `vmstorage` nodes are unavailable.
For example, when `-replicationFactor=3` is passed to `vminsert`, then it replicates all the ingested data to 3 distinct `vmstorage` nodes.
When the replication is enabled, `-dedup.minScrapeInterval=1ms` command-line flag must be passed to `vmselect`
in order to de-duplicate replicated data during queries. It is OK if `-dedup.minScrapeInterval` exceeds 1ms
When the replication is enabled, `-replicationFactor=N` and `-dedup.minScrapeInterval=1ms` command-line flag must be passed to `vmselect` nodes.
The `-replicationFactor=N` improves query performance when a part of vmstorage nodes respond slowly and/or temporarily unavailable.
The `-dedup.minScrapeInterval=1ms` de-duplicates replicated data during queries. It is OK if `-dedup.minScrapeInterval` exceeds 1ms
when [deduplication](https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/README.md#deduplication) is used additionally to replication.
Note that [replication doesn't save from disaster](https://medium.com/@valyala/speeding-up-backups-for-big-time-series-databases-533c1a927883),