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https://github.com/prometheus/prometheus.git
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e64d7d8928
This is the same change made in #13040, plus subsequent improvements, applied to agent-mode code. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
137 lines
3.4 KiB
Go
137 lines
3.4 KiB
Go
// Copyright 2022 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package agent
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import (
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"fmt"
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"math"
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"sync"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/tsdb/chunks"
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)
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func TestNoDeadlock(t *testing.T) {
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const numWorkers = 1000
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var (
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wg sync.WaitGroup
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started = make(chan struct{})
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stripeSeries = newStripeSeries(3)
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)
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wg.Add(numWorkers)
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for i := 0; i < numWorkers; i++ {
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go func() {
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defer wg.Done()
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<-started
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_ = stripeSeries.GC(math.MaxInt64)
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}()
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}
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wg.Add(numWorkers)
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for i := 0; i < numWorkers; i++ {
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go func(i int) {
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defer wg.Done()
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<-started
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series := &memSeries{
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ref: chunks.HeadSeriesRef(i),
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lset: labels.FromMap(map[string]string{
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"id": fmt.Sprintf("%d", i),
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}),
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}
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stripeSeries.Set(series.lset.Hash(), series)
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}(i)
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}
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finished := make(chan struct{})
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go func() {
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wg.Wait()
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close(finished)
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}()
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close(started)
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select {
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case <-finished:
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return
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case <-time.After(15 * time.Second):
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require.FailNow(t, "deadlock detected")
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}
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}
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func labelsWithHashCollision() (labels.Labels, labels.Labels) {
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// These two series have the same XXHash; thanks to https://github.com/pstibrany/labels_hash_collisions
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ls1 := labels.FromStrings("__name__", "metric", "lbl1", "value", "lbl2", "l6CQ5y")
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ls2 := labels.FromStrings("__name__", "metric", "lbl1", "value", "lbl2", "v7uDlF")
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if ls1.Hash() != ls2.Hash() {
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// These ones are the same when using -tags stringlabels
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ls1 = labels.FromStrings("__name__", "metric", "lbl", "HFnEaGl")
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ls2 = labels.FromStrings("__name__", "metric", "lbl", "RqcXatm")
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}
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if ls1.Hash() != ls2.Hash() {
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panic("This code needs to be updated: find new labels with colliding hash values.")
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}
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return ls1, ls2
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}
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// stripeSeriesWithCollidingSeries returns a stripeSeries with two memSeries having the same, colliding, hash.
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func stripeSeriesWithCollidingSeries(_ *testing.T) (*stripeSeries, *memSeries, *memSeries) {
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lbls1, lbls2 := labelsWithHashCollision()
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ms1 := memSeries{
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lset: lbls1,
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}
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ms2 := memSeries{
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lset: lbls2,
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}
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hash := lbls1.Hash()
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s := newStripeSeries(1)
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s.Set(hash, &ms1)
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s.Set(hash, &ms2)
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return s, &ms1, &ms2
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}
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func TestStripeSeries_Get(t *testing.T) {
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s, ms1, ms2 := stripeSeriesWithCollidingSeries(t)
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hash := ms1.lset.Hash()
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// Verify that we can get both of the series despite the hash collision
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got := s.GetByHash(hash, ms1.lset)
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require.Same(t, ms1, got)
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got = s.GetByHash(hash, ms2.lset)
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require.Same(t, ms2, got)
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}
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func TestStripeSeries_gc(t *testing.T) {
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s, ms1, ms2 := stripeSeriesWithCollidingSeries(t)
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hash := ms1.lset.Hash()
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s.GC(1)
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// Verify that we can get neither ms1 nor ms2 after gc-ing corresponding series
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got := s.GetByHash(hash, ms1.lset)
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require.Nil(t, got)
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got = s.GetByHash(hash, ms2.lset)
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require.Nil(t, got)
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}
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