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app/vmagent/remotewrite: skip sending empty block to downstream server (#6241)

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Occasionally, vmagent sends empty blocks to downstream servers. If a
downstream server returns an unexpected response, vmagent gets stuck in
a retry loop. While vmagent handles 400 and 409 errors, there are
various prometheus remote write implementations that return different
error codes. For example, vector returns a 422 error. To mitigate the
risk of vmagent getting stuck in a retry loop, it is advisable to skip
sending empty blocks to downstream servers.

Co-authored-by: hao.peng <hao.peng@smartx.com>
Co-authored-by: Zhu Jiekun <jiekun.dev@gmail.com>
Co-authored-by: hagen1778 <roman@victoriametrics.com>
This commit is contained in:
viperstars 2024-05-17 20:55:17 +08:00 committed by GitHub
parent ce3cfd720e
commit 3661373cc2
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GPG key ID: B5690EEEBB952194
2 changed files with 8 additions and 1 deletions
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8
app/vmagent/remotewrite/client.go
View file

@ -11,6 +11,8 @@ import (
"sync"
"time"
"github.com/VictoriaMetrics/metrics"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/awsapi"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
@ -20,7 +22,6 @@ import (
"github.com/VictoriaMetrics/VictoriaMetrics/lib/ratelimiter"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/timerpool"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/timeutil"
"github.com/VictoriaMetrics/metrics"
)
var (
@ -298,6 +299,11 @@ func (c *client) runWorker() {
if !ok {
return
}
if len(block) == 0 {
// skip empty data blocks from sending
// see https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6241
continue
}
go func() {
startTime := time.Now()
ch <- c.sendBlock(block)

1
docs/CHANGELOG.md
View file

@ -51,6 +51,7 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).
* BUGFIX: [vmui](https://docs.victoriametrics.com/#vmui): fix calendar display when `UTC+00:00` timezone is set. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6239).
* BUGFIX: [vmui](https://docs.victoriametrics.com/#vmui): remove redundant requests on the `Explore Cardinality` page. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6240).
* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent/): prevent potential panic during [stream aggregation](https://docs.victoriametrics.com/stream-aggregation.html) if more than one `--remoteWrite.streamAggr.dedupInterval` is configured. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6205).
* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent/): skip empty data blocks before sending to the remote write destination. Thanks to @viperstars for [the pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6241).
* BUGFIX: [stream aggregation](https://docs.victoriametrics.com/stream-aggregation/): set correct suffix `<output>_prometheus` for aggregation outputs [increase_prometheus](https://docs.victoriametrics.com/stream-aggregation/#increase_prometheus) and [total_prometheus](https://docs.victoriametrics.com/stream-aggregation/#total_prometheus). Before, outputs `total` and `total_prometheus` or `increase` and `increase_prometheus` had the same suffix.
* BUGFIX: properly estimate the needed memory for query execution if it has the format [`aggr_func`](https://docs.victoriametrics.com/metricsql/#aggregate-functions)([`rollup_func[d]`](https://docs.victoriametrics.com/metricsql/#rollup-functions) (for example, `sum(rate(request_duration_seconds_bucket[5m]))`). This should allow performing aggregations over bigger number of time series when VictoriaMetrics runs in environments with small amounts of available memory. The issue has been introduced in [this commit](https://github.com/VictoriaMetrics/VictoriaMetrics/commit/5138eaeea0791caa34bcfab410e0ca9cd253cd8f) in [v1.83.0](https://docs.victoriametrics.com/changelog_2022/#v1830).
* BUGFIX: [Single-node VictoriaMetrics](https://docs.victoriametrics.com/) and `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): correctly apply `-inmemoryDataFlushInterval` when it's set to minimum supported value 1s.