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Introduce timestamp tolerance in scrapes 

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
This commit is contained in:
Julien Pivotto 2020-09-25 15:44:47 +02:00
parent 8dbfa14607
commit 6544f95403
1 changed files with 15 additions and 0 deletions
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15
scrape/scrape.go
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@ -47,6 +47,11 @@ import (
"github.com/prometheus/prometheus/storage"
)
// Temporary tolerance for scrape appends timestamps alignment, to enable better
// compression at the TSDB level.
// See https://github.com/prometheus/prometheus/issues/7846
const scrapeTimestampTolerance = 2 * time.Millisecond
var errNameLabelMandatory = fmt.Errorf("missing metric name (%s label)", labels.MetricName)
var (
@ -1033,6 +1038,16 @@ func (sl *scrapeLoop) scrapeAndReport(interval, timeout time.Duration, last time
)
}
// Temporary workaround for a jitter in go timers that causes disk space
// increase in TSDB.
// See https://github.com/prometheus/prometheus/issues/7846
if last.IsZero() && interval > 100*scrapeTimestampTolerance {
exactStart := last.Add(interval)
if t := start.Sub(exactStart); t >= -scrapeTimestampTolerance && t <= scrapeTimestampTolerance {
start = exactStart
}
}
b := sl.buffers.Get(sl.lastScrapeSize).([]byte)
defer sl.buffers.Put(b)
buf := bytes.NewBuffer(b)