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app/vmselect: return 503 status code when partial responses are denied and some of vmstorage nodes are temporarily unavailable

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This should help detecting this case and automatic retrying the query at healthy cluster replica
in another availability zone.

This commit is needed as a preparation for automatic query retry at another backend at vmauth on 5xx errors
as described at https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4792#issuecomment-1674338561
This commit is contained in:
Aliaksandr Valialkin 2023-09-07 16:07:03 +02:00
parent 841465d98a
commit 8ff9235717
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2 changed files with 13 additions and 1 deletions
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13
app/vmselect/netstorage/netstorage.go
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@ -1745,6 +1745,12 @@ func (snr *storageNodesRequest) collectResults(partialResultsCounter *metrics.Co
// and the number of partial responses reach -replicationFactor,
// since this means that the response is partial.
snr.finishQueryTracers("cancel request because partial responses are denied and some vmstorage nodes failed to return response")
// Returns 503 status code for partial response, so the caller could retry it if needed.
err = &httpserver.ErrorWithStatusCode{
Err: err,
StatusCode: http.StatusServiceUnavailable,
}
return false, err
}
continue
@ -1771,7 +1777,12 @@ func (snr *storageNodesRequest) collectResults(partialResultsCounter *metrics.Co
if len(errsPartial) == len(sns) {
// All the vmstorage nodes returned error.
// Return only the first error, since it has no sense in returning all errors.
return false, errsPartial[0]
// Returns 503 status code for partial response, so the caller could retry it if needed.
err := &httpserver.ErrorWithStatusCode{
Err: errsPartial[0],
StatusCode: http.StatusServiceUnavailable,
}
return false, err
}
// Return partial results.
// This allows gracefully degrade vmselect in the case

1
docs/CHANGELOG.md
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@ -19,6 +19,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
* BUGFIX: [vminsert enterprise](https://docs.victoriametrics.com/enterprise.html): properly parse `/insert/multitenant/*` urls, which have been broken since [v1.93.2](#v1932). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4947).
* BUGFIX: properly build production armv5 binaries for `GOARCH=arm`. This has been broken after the upgrading of Go builder to Go1.21.0. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4965).
* BUGFIX: [vmselect](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html): return `503 Service Unavailable` status code when [partial responses](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#cluster-availability) are denied and some of `vmstorage` nodes are temporarily unavailable. Previously `422 Unprocessable Entiry` status code was mistakenly returned in this case, which could prevent from automatic recovery by re-sending the request to healthy cluster replica in another availability zone.
## [v1.87.8](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.87.8)