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Move the tolerance logic in the loop function.

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Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
This commit is contained in:
Julien Pivotto 2020-10-05 18:17:50 +02:00
parent 6544f95403
commit 98e14611a5
1 changed files with 23 additions and 16 deletions
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39
scrape/scrape.go
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@ -991,6 +991,7 @@ func (sl *scrapeLoop) run(interval, timeout time.Duration, errc chan<- error) {
var last time.Time
ticker := time.NewTicker(interval)
alignedScrapeTime := time.Now()
defer ticker.Stop()
mainLoop:
@ -1004,7 +1005,23 @@ mainLoop:
default:
}
last = sl.scrapeAndReport(interval, timeout, last, errc)
// Temporary workaround for a jitter in go timers that causes disk space
// increase in TSDB.
// See https://github.com/prometheus/prometheus/issues/7846
scrapeTime := time.Now()
if interval > 100*scrapeTimestampTolerance {
// For some reason, a ticker might have been skipped, in which case we
// would call alignedScrapeTime.Add(interval) multiple times.
for scrapeTime.Sub(alignedScrapeTime) >= interval {
alignedScrapeTime = alignedScrapeTime.Add(interval)
}
// Align the scrape time if we are in the tolerance boundaries.
if t := scrapeTime.Sub(alignedScrapeTime); t >= -scrapeTimestampTolerance && t <= scrapeTimestampTolerance {
scrapeTime = alignedScrapeTime
}
}
last = sl.scrapeAndReport(interval, timeout, last, scrapeTime, errc)
select {
case <-sl.parentCtx.Done():
@ -1028,7 +1045,7 @@ mainLoop:
// In the happy scenario, a single appender is used.
// This function uses sl.parentCtx instead of sl.ctx on purpose. A scrape should
// only be cancelled on shutdown, not on reloads.
func (sl *scrapeLoop) scrapeAndReport(interval, timeout time.Duration, last time.Time, errc chan<- error) time.Time {
func (sl *scrapeLoop) scrapeAndReport(interval, timeout time.Duration, last, appendTime time.Time, errc chan<- error) time.Time {
start := time.Now()
// Only record after the first scrape.
@ -1038,16 +1055,6 @@ 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)
@ -1068,7 +1075,7 @@ func (sl *scrapeLoop) scrapeAndReport(interval, timeout time.Duration, last time
}()
defer func() {
if err = sl.report(app, start, time.Since(start), total, added, seriesAdded, scrapeErr); err != nil {
if err = sl.report(app, appendTime, time.Since(start), total, added, seriesAdded, scrapeErr); err != nil {
level.Warn(sl.l).Log("msg", "Appending scrape report failed", "err", err)
}
}()
@ -1076,7 +1083,7 @@ func (sl *scrapeLoop) scrapeAndReport(interval, timeout time.Duration, last time
if forcedErr := sl.getForcedError(); forcedErr != nil {
scrapeErr = forcedErr
// Add stale markers.
if _, _, _, err := sl.append(app, []byte{}, "", start); err != nil {
if _, _, _, err := sl.append(app, []byte{}, "", appendTime); err != nil {
app.Rollback()
app = sl.appender(sl.parentCtx)
level.Warn(sl.l).Log("msg", "Append failed", "err", err)
@ -1110,14 +1117,14 @@ func (sl *scrapeLoop) scrapeAndReport(interval, timeout time.Duration, last time
// A failed scrape is the same as an empty scrape,
// we still call sl.append to trigger stale markers.
total, added, seriesAdded, appErr = sl.append(app, b, contentType, start)
total, added, seriesAdded, appErr = sl.append(app, b, contentType, appendTime)
if appErr != nil {
app.Rollback()
app = sl.appender(sl.parentCtx)
level.Debug(sl.l).Log("msg", "Append failed", "err", appErr)
// The append failed, probably due to a parse error or sample limit.
// Call sl.append again with an empty scrape to trigger stale markers.
if _, _, _, err := sl.append(app, []byte{}, "", start); err != nil {
if _, _, _, err := sl.append(app, []byte{}, "", appendTime); err != nil {
app.Rollback()
app = sl.appender(sl.parentCtx)
level.Warn(sl.l).Log("msg", "Append failed", "err", err)