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app/vmagent: mention corner case with dangling queues and identical URLs

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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6140

We don't cover this corner case as it has low chance for reproduction.
Precisely, the requirements are following:
1. vmagent need to be configured with multiple identical `remoteWrite.url` flags;
2. At least one of the persistent queues need to be non-empty, which already
signalizes about issues with setup;
3. vmagent need to be restarted with removing of one of `remoteWrite.url` flags.

We do not document this case in vmagent.md as it seems to be a rare corner case
and its explanation will require too much of explanation and confuse users.

Signed-off-by: hagen1778 <roman@victoriametrics.com>
(cherry picked from commit 4251292708)
This commit is contained in:
hagen1778 2024-04-23 14:49:45 +02:00
parent f2897fb859
commit 57c841669c
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3
app/vmagent/remotewrite/remotewrite.go
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@ -259,6 +259,9 @@ func dropDanglingQueues() {
// This is required for the case when the number of queues has been changed or URL have been changed.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4014
//
// In case if there were many persistent queues with identical *remoteWriteURLs
// the queue with the last index will be dropped.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6140
existingQueues := make(map[string]struct{}, len(rwctxsDefault))
for _, rwctx := range rwctxsDefault {
existingQueues[rwctx.fq.Dirname()] = struct{}{}