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lib/promscrape: make a copy of ScrapeWork from discovered []ScrapeWork slice instead of referring to an item in this slice

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This should prevent from holding previously discovered []ScrapeWork slices when a part of discovered targets changes over time.
This should reduce memory usage for the case when big number of discovered scrape targets changes over time.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/825
This commit is contained in:
Aliaksandr Valialkin 2020-11-10 16:11:16 +02:00
parent 2ec02b7bdb
commit 697fd44158
2 changed files with 5 additions and 3 deletions
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2
docs/CHANGELOG.md
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@ -2,6 +2,8 @@
# tip # tip
* FEATURE: vmagent: reduce memory usage when service discovery detects big number of scrape targets and the set of discovered targets changes over time.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/825
* FEATURE: vmagent: add `-promscrape.dropOriginalLabels` command-line option, which can be used for reducing memory usage when scraping big number of targets. * FEATURE: vmagent: add `-promscrape.dropOriginalLabels` command-line option, which can be used for reducing memory usage when scraping big number of targets.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/825#issuecomment-724308361 for details. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/825#issuecomment-724308361 for details.
* FEATURE: vmalert: explicitly set extra labels to alert entities. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/870 * FEATURE: vmalert: explicitly set extra labels to alert entities. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/870

6
lib/promscrape/targetstatus.go
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@ -64,7 +64,7 @@ func (tsm *targetStatusMap) Reset() {
func (tsm *targetStatusMap) Register(sw *ScrapeWork) { func (tsm *targetStatusMap) Register(sw *ScrapeWork) {
tsm.mu.Lock() tsm.mu.Lock()
tsm.m[sw.ID] = targetStatus{ tsm.m[sw.ID] = targetStatus{
sw: sw, sw: *sw,
} }
tsm.mu.Unlock() tsm.mu.Unlock()
} }
@ -78,7 +78,7 @@ func (tsm *targetStatusMap) Unregister(sw *ScrapeWork) {
func (tsm *targetStatusMap) Update(sw *ScrapeWork, group string, up bool, scrapeTime, scrapeDuration int64, err error) { func (tsm *targetStatusMap) Update(sw *ScrapeWork, group string, up bool, scrapeTime, scrapeDuration int64, err error) {
tsm.mu.Lock() tsm.mu.Lock()
tsm.m[sw.ID] = targetStatus{ tsm.m[sw.ID] = targetStatus{
sw: sw, sw: *sw,
up: up, up: up,
scrapeGroup: group, scrapeGroup: group,
scrapeTime: scrapeTime, scrapeTime: scrapeTime,
@ -221,7 +221,7 @@ type jobStatus struct {
} }
type targetStatus struct { type targetStatus struct {
sw *ScrapeWork sw ScrapeWork
up bool up bool
scrapeGroup string scrapeGroup string
scrapeTime int64 scrapeTime int64