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lib/promscrape: do not populate response body to memory in stream parsing mode if -promscrape.noStaleMarkers is set

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The response body isn't used if -promscrape.noStaleMarkers is set after the commit 2876137c92 ,
so there is no sense in pupulating it in memory. This should reduce memory usage when scraping big responses.

See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1728#issuecomment-949630694
This commit is contained in:
Aliaksandr Valialkin 2021-10-22 16:44:41 +03:00
parent fcdb0c415e
commit b08f51f5d3
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GPG key ID: A72BEC6CD3D0DED1
1 changed files with 13 additions and 6 deletions
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13
lib/promscrape/scrapework.go
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@ -455,11 +455,16 @@ func (sw *scrapeWork) pushData(wr *prompbmarshal.WriteRequest) {
type streamBodyReader struct {
sr *streamReader
body []byte
bodyLen int
captureBody bool
}
func (sbr *streamBodyReader) Read(b []byte) (int, error) {
n, err := sbr.sr.Read(b)
sbr.bodyLen += n
if sbr.captureBody {
sbr.body = append(sbr.body, b[:n]...)
}
return n, err
}
@ -468,7 +473,9 @@ func (sw *scrapeWork) scrapeStream(scrapeTimestamp, realTimestamp int64) error {
samplesPostRelabeling := 0
wc := writeRequestCtxPool.Get(sw.prevLabelsLen)
// Do not pool sbr and do not pre-allocate sbr.body in order to reduce memory usage when scraping big responses.
sbr := &streamBodyReader{}
sbr := &streamBodyReader{
captureBody: !*noStaleMarkers,
}
sr, err := sw.GetStreamReader()
if err != nil {
@ -507,7 +514,7 @@ func (sw *scrapeWork) scrapeStream(scrapeTimestamp, realTimestamp int64) error {
endTimestamp := time.Now().UnixNano() / 1e6
duration := float64(endTimestamp-realTimestamp) / 1e3
scrapeDuration.Update(duration)
scrapeResponseSize.Update(float64(len(bodyString)))
scrapeResponseSize.Update(float64(sbr.bodyLen))
up := 1
if err != nil {
if samplesScraped == 0 {
@ -530,7 +537,7 @@ func (sw *scrapeWork) scrapeStream(scrapeTimestamp, realTimestamp int64) error {
sw.addAutoTimeseries(wc, "scrape_timeout_seconds", sw.Config.ScrapeTimeout.Seconds(), scrapeTimestamp)
sw.pushData(&wc.writeRequest)
sw.prevLabelsLen = len(wc.labels)
sw.prevBodyLen = len(bodyString)
sw.prevBodyLen = sbr.bodyLen
wc.reset()
writeRequestCtxPool.Put(wc)
if !areIdenticalSeries {