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docs: clarify steps for rollup cache purge for vmselects

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
(cherry picked from commit 5e38dde18d)
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hagen1778 2023-11-28 09:38:19 +01:00
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2 changed files with 7 additions and 1 deletions
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2
docs/Troubleshooting.md
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@ -154,6 +154,8 @@ If you see unexpected or unreliable query results from VictoriaMetrics, then try
- By passing `nocache=1` query arg to every request to `/api/v1/query` and `/api/v1/query_range`. - By passing `nocache=1` query arg to every request to `/api/v1/query` and `/api/v1/query_range`.
If you use Grafana, then this query arg can be specified in `Custom Query Parameters` field If you use Grafana, then this query arg can be specified in `Custom Query Parameters` field
at Prometheus datasource settings - see [these docs](https://grafana.com/docs/grafana/latest/datasources/prometheus/) for details. at Prometheus datasource settings - see [these docs](https://grafana.com/docs/grafana/latest/datasources/prometheus/) for details.
If the problem was in the cache, try resetting it via [resetRollupCache handler](https://docs.victoriametrics.com/url-examples.html#internalresetrollupresultcache).
1. If you use cluster version of VictoriaMetrics, then it may return partial responses by default 1. If you use cluster version of VictoriaMetrics, then it may return partial responses by default
when some of `vmstorage` nodes are temporarily unavailable - see [cluster availability docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#cluster-availability) when some of `vmstorage` nodes are temporarily unavailable - see [cluster availability docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#cluster-availability)

6
docs/url-examples.md
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@ -631,7 +631,7 @@ curl -Is http://localhost:8428/internal/resetRollupResultCache
</div> </div>
Cluster version of VictoriaMetrics:: Cluster version of VictoriaMetrics:
<div class="with-copy" markdown="1"> <div class="with-copy" markdown="1">
@ -639,6 +639,10 @@ Cluster version of VictoriaMetrics::
curl -Is http://<vmselect>:8481/select/internal/resetRollupResultCache curl -Is http://<vmselect>:8481/select/internal/resetRollupResultCache
``` ```
vmselect will propagate this call to the rest of the vmselects listed in its `-selectNode` cmd-line flag. If this
flag isn't set, then cache need to be purged from each vmselect individually.
</div> </div>
### TCP and UDP ### TCP and UDP