Merge pull request #14609 from charleskorn/rate-over-mixed-custom-exponential-histograms

promql: fix "cannot reduce resolution to custom buckets schema" panic in `rate` over native histograms with mix of custom and exponential buckets
This commit is contained in:
Björn Rabenstein 2024-08-08 14:03:41 +02:00 committed by GitHub
commit 41f8a0223c
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GPG key ID: B5690EEEBB952194
3 changed files with 45 additions and 14 deletions

View file

@ -179,15 +179,21 @@ func extrapolatedRate(vals []parser.Value, args parser.Expressions, enh *EvalNod
// Otherwise, it returns the calculated histogram and an empty annotation.
func histogramRate(points []HPoint, isCounter bool, metricName string, pos posrange.PositionRange) (*histogram.FloatHistogram, annotations.Annotations) {
prev := points[0].H
usingCustomBuckets := prev.UsesCustomBuckets()
last := points[len(points)-1].H
if last == nil {
return nil, annotations.New().Add(annotations.NewMixedFloatsHistogramsWarning(metricName, pos))
}
minSchema := prev.Schema
if last.Schema < minSchema {
minSchema = last.Schema
}
if last.UsesCustomBuckets() != usingCustomBuckets {
return nil, annotations.New().Add(annotations.NewMixedExponentialCustomHistogramsWarning(metricName, pos))
}
var annos annotations.Annotations
// We check for gauge type histograms in the loop below, but the loop below does not run on the first and last point,
@ -215,6 +221,9 @@ func histogramRate(points []HPoint, isCounter bool, metricName string, pos posra
if curr.Schema < minSchema {
minSchema = curr.Schema
}
if curr.UsesCustomBuckets() != usingCustomBuckets {
return nil, annotations.New().Add(annotations.NewMixedExponentialCustomHistogramsWarning(metricName, pos))
}
}
h := last.CopyToSchema(minSchema)

View file

@ -1003,13 +1003,6 @@ func (t *test) execRangeEval(cmd *evalCmd, engine promql.QueryEngine) error {
return fmt.Errorf("error creating range query for %q (line %d): %w", cmd.expr, cmd.line, err)
}
res := q.Exec(t.context)
countWarnings, _ := res.Warnings.CountWarningsAndInfo()
if !cmd.warn && countWarnings > 0 {
return fmt.Errorf("unexpected warnings evaluating query %q (line %d): %v", cmd.expr, cmd.line, res.Warnings)
}
if cmd.warn && countWarnings == 0 {
return fmt.Errorf("expected warnings evaluating query %q (line %d) but got none", cmd.expr, cmd.line)
}
if res.Err != nil {
if cmd.fail {
return cmd.checkExpectedFailure(res.Err)
@ -1020,6 +1013,13 @@ func (t *test) execRangeEval(cmd *evalCmd, engine promql.QueryEngine) error {
if res.Err == nil && cmd.fail {
return fmt.Errorf("expected error evaluating query %q (line %d) but got none", cmd.expr, cmd.line)
}
countWarnings, _ := res.Warnings.CountWarningsAndInfo()
if !cmd.warn && countWarnings > 0 {
return fmt.Errorf("unexpected warnings evaluating query %q (line %d): %v", cmd.expr, cmd.line, res.Warnings)
}
if cmd.warn && countWarnings == 0 {
return fmt.Errorf("expected warnings evaluating query %q (line %d) but got none", cmd.expr, cmd.line)
}
defer q.Close()
if err := cmd.compareResult(res.Value); err != nil {
@ -1050,13 +1050,6 @@ func (t *test) runInstantQuery(iq atModifierTestCase, cmd *evalCmd, engine promq
}
defer q.Close()
res := q.Exec(t.context)
countWarnings, _ := res.Warnings.CountWarningsAndInfo()
if !cmd.warn && countWarnings > 0 {
return fmt.Errorf("unexpected warnings evaluating query %q (line %d): %v", iq.expr, cmd.line, res.Warnings)
}
if cmd.warn && countWarnings == 0 {
return fmt.Errorf("expected warnings evaluating query %q (line %d) but got none", iq.expr, cmd.line)
}
if res.Err != nil {
if cmd.fail {
if err := cmd.checkExpectedFailure(res.Err); err != nil {
@ -1070,6 +1063,13 @@ func (t *test) runInstantQuery(iq atModifierTestCase, cmd *evalCmd, engine promq
if res.Err == nil && cmd.fail {
return fmt.Errorf("expected error evaluating query %q (line %d) but got none", iq.expr, cmd.line)
}
countWarnings, _ := res.Warnings.CountWarningsAndInfo()
if !cmd.warn && countWarnings > 0 {
return fmt.Errorf("unexpected warnings evaluating query %q (line %d): %v", iq.expr, cmd.line, res.Warnings)
}
if cmd.warn && countWarnings == 0 {
return fmt.Errorf("expected warnings evaluating query %q (line %d) but got none", iq.expr, cmd.line)
}
err = cmd.compareResult(res.Value)
if err != nil {
return fmt.Errorf("error in %s %s (line %d): %w", cmd, iq.expr, cmd.line, err)

View file

@ -762,3 +762,25 @@ eval_warn instant at 30s rate(some_metric[30s])
# Test the case where we have more than two points for rate
eval_warn instant at 1m rate(some_metric[1m])
{} {{count:0.03333333333333333 sum:0.03333333333333333 buckets:[0.03333333333333333]}}
clear
# Test rate() over mixed exponential and custom buckets.
load 30s
some_metric {{schema:0 sum:1 count:1 buckets:[1]}} {{schema:-53 sum:1 count:1 custom_values:[5 10] buckets:[1]}} {{schema:0 sum:5 count:4 buckets:[1 2 1]}} {{schema:-53 sum:1 count:1 custom_values:[5 10] buckets:[1]}}
# Start and end with exponential, with custom in the middle.
eval_warn instant at 1m rate(some_metric[1m])
# Should produce no results.
# Start and end with custom, with exponential in the middle.
eval_warn instant at 1m30s rate(some_metric[1m])
# Should produce no results.
# Start with custom, end with exponential.
eval_warn instant at 1m rate(some_metric[30s])
# Should produce no results.
# Start with exponential, end with custom.
eval_warn instant at 30s rate(some_metric[30s])
# Should produce no results.