prometheus/tsdb/exemplar_test.go

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// Copyright 2020 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tsdb
import (
"reflect"
"strconv"
"testing"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/pkg/exemplar"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/storage"
)
func TestAddExemplar(t *testing.T) {
exs, err := NewCircularExemplarStorage(2, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
l := labels.Labels{
{Name: "service", Value: "asdf"},
}
e := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "qwerty",
},
},
Value: 0.1,
Ts: 1,
}
err = es.AddExemplar(l, e)
require.NoError(t, err)
require.Equal(t, es.index[l.String()].newest, 0, "exemplar was not stored correctly")
e2 := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "zxcvb",
},
},
Value: 0.1,
Ts: 2,
}
err = es.AddExemplar(l, e2)
require.NoError(t, err)
require.Equal(t, es.index[l.String()].newest, 1, "exemplar was not stored correctly, location of newest exemplar for series in index did not update")
require.True(t, es.exemplars[es.index[l.String()].newest].exemplar.Equals(e2), "exemplar was not stored correctly, expected %+v got: %+v", e2, es.exemplars[es.index[l.String()].newest].exemplar)
err = es.AddExemplar(l, e2)
require.NoError(t, err, "no error is expected attempting to add duplicate exemplar")
e3 := e2
e3.Ts = 3
err = es.AddExemplar(l, e3)
require.NoError(t, err, "no error is expected when attempting to add duplicate exemplar, even with different timestamp")
e3.Ts = 1
e3.Value = 0.3
err = es.AddExemplar(l, e3)
require.Equal(t, err, storage.ErrOutOfOrderExemplar)
}
func TestStorageOverflow(t *testing.T) {
// Test that circular buffer index and assignment
// works properly, adding more exemplars than can
// be stored and then querying for them.
exs, err := NewCircularExemplarStorage(5, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
l := labels.Labels{
{Name: "service", Value: "asdf"},
}
var eList []exemplar.Exemplar
for i := 0; i < len(es.exemplars)+1; i++ {
e := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "a",
},
},
Value: float64(i+1) / 10,
Ts: int64(101 + i),
}
es.AddExemplar(l, e)
eList = append(eList, e)
}
require.True(t, (es.exemplars[0].exemplar.Ts == 106), "exemplar was not stored correctly")
m, err := labels.NewMatcher(labels.MatchEqual, l[0].Name, l[0].Value)
require.NoError(t, err, "error creating label matcher for exemplar query")
ret, err := es.Select(100, 110, []*labels.Matcher{m})
require.NoError(t, err)
require.True(t, len(ret) == 1, "select should have returned samples for a single series only")
require.True(t, reflect.DeepEqual(eList[1:], ret[0].Exemplars), "select did not return expected exemplars\n\texpected: %+v\n\tactual: %+v\n", eList[1:], ret[0].Exemplars)
}
func TestSelectExemplar(t *testing.T) {
exs, err := NewCircularExemplarStorage(5, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
l := labels.Labels{{Name: "service", Value: "asdf"}}
e := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "qwerty",
},
},
Value: 0.1,
Ts: 12,
}
err = es.AddExemplar(l, e)
require.NoError(t, err, "adding exemplar failed")
require.True(t, reflect.DeepEqual(es.exemplars[0].exemplar, e), "exemplar was not stored correctly")
m, err := labels.NewMatcher(labels.MatchEqual, l[0].Name, l[0].Value)
require.NoError(t, err, "error creating label matcher for exemplar query")
ret, err := es.Select(0, 100, []*labels.Matcher{m})
require.NoError(t, err)
require.True(t, len(ret) == 1, "select should have returned samples for a single series only")
expectedResult := []exemplar.Exemplar{e}
require.True(t, reflect.DeepEqual(expectedResult, ret[0].Exemplars), "select did not return expected exemplars\n\texpected: %+v\n\tactual: %+v\n", expectedResult, ret[0].Exemplars)
}
func TestSelectExemplar_MultiSeries(t *testing.T) {
exs, err := NewCircularExemplarStorage(5, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
l1 := labels.Labels{
{Name: "__name__", Value: "test_metric"},
{Name: "service", Value: "asdf"},
}
l2 := labels.Labels{
{Name: "__name__", Value: "test_metric2"},
{Name: "service", Value: "qwer"},
}
for i := 0; i < len(es.exemplars); i++ {
e1 := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "a",
},
},
Value: float64(i+1) / 10,
Ts: int64(101 + i),
}
err = es.AddExemplar(l1, e1)
require.NoError(t, err)
e2 := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "b",
},
},
Value: float64(i+1) / 10,
Ts: int64(101 + i),
}
err = es.AddExemplar(l2, e2)
require.NoError(t, err)
}
m, err := labels.NewMatcher(labels.MatchEqual, l2[0].Name, l2[0].Value)
require.NoError(t, err, "error creating label matcher for exemplar query")
ret, err := es.Select(100, 200, []*labels.Matcher{m})
require.NoError(t, err)
require.True(t, len(ret) == 1, "select should have returned samples for a single series only")
require.True(t, len(ret[0].Exemplars) == 3, "didn't get expected 8 exemplars, got %d", len(ret[0].Exemplars))
m, err = labels.NewMatcher(labels.MatchEqual, l1[0].Name, l1[0].Value)
require.NoError(t, err, "error creating label matcher for exemplar query")
ret, err = es.Select(100, 200, []*labels.Matcher{m})
require.NoError(t, err)
require.True(t, len(ret) == 1, "select should have returned samples for a single series only")
require.True(t, len(ret[0].Exemplars) == 2, "didn't get expected 8 exemplars, got %d", len(ret[0].Exemplars))
}
func TestSelectExemplar_TimeRange(t *testing.T) {
lenEs := 5
exs, err := NewCircularExemplarStorage(lenEs, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
l := labels.Labels{
{Name: "service", Value: "asdf"},
}
for i := 0; i < lenEs; i++ {
err := es.AddExemplar(l, exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: strconv.Itoa(i),
},
},
Value: 0.1,
Ts: int64(101 + i),
})
require.NoError(t, err)
require.Equal(t, es.index[l.String()].newest, i, "exemplar was not stored correctly")
}
m, err := labels.NewMatcher(labels.MatchEqual, l[0].Name, l[0].Value)
require.NoError(t, err, "error creating label matcher for exemplar query")
ret, err := es.Select(102, 104, []*labels.Matcher{m})
require.NoError(t, err)
require.True(t, len(ret) == 1, "select should have returned samples for a single series only")
require.True(t, len(ret[0].Exemplars) == 3, "didn't get expected two exemplars %d, %+v", len(ret[0].Exemplars), ret)
}
// Test to ensure that even though a series matches more than one matcher from the
// query that it's exemplars are only included in the result a single time.
func TestSelectExemplar_DuplicateSeries(t *testing.T) {
exs, err := NewCircularExemplarStorage(4, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
e := exemplar.Exemplar{
Labels: labels.Labels{
labels.Label{
Name: "traceID",
Value: "qwerty",
},
},
Value: 0.1,
Ts: 12,
}
l := labels.Labels{
{Name: "service", Value: "asdf"},
{Name: "cluster", Value: "us-central1"},
}
// Lets just assume somehow the PromQL expression generated two separate lists of matchers,
// both of which can select this particular series.
m := [][]*labels.Matcher{
{
labels.MustNewMatcher(labels.MatchEqual, l[0].Name, l[0].Value),
},
{
labels.MustNewMatcher(labels.MatchEqual, l[1].Name, l[1].Value),
},
}
err = es.AddExemplar(l, e)
require.NoError(t, err, "adding exemplar failed")
require.True(t, reflect.DeepEqual(es.exemplars[0].exemplar, e), "exemplar was not stored correctly")
ret, err := es.Select(0, 100, m...)
require.NoError(t, err)
require.True(t, len(ret) == 1, "select should have returned samples for a single series only")
}
func TestIndexOverwrite(t *testing.T) {
exs, err := NewCircularExemplarStorage(2, nil)
require.NoError(t, err)
es := exs.(*CircularExemplarStorage)
l1 := labels.Labels{
{Name: "service", Value: "asdf"},
}
l2 := labels.Labels{
{Name: "service", Value: "qwer"},
}
err = es.AddExemplar(l1, exemplar.Exemplar{Value: 1, Ts: 1})
require.NoError(t, err)
err = es.AddExemplar(l2, exemplar.Exemplar{Value: 2, Ts: 2})
require.NoError(t, err)
err = es.AddExemplar(l2, exemplar.Exemplar{Value: 3, Ts: 3})
require.NoError(t, err)
// Ensure index GC'ing is taking place, there should no longer be any
// index entry for series l1 since we just wrote two exemplars for series l2.
_, ok := es.index[l1.String()]
require.False(t, ok)
require.Equal(t, &indexEntry{1, 0, l2}, es.index[l2.String()])
err = es.AddExemplar(l1, exemplar.Exemplar{Value: 4, Ts: 4})
require.NoError(t, err)
i := es.index[l2.String()]
require.Equal(t, &indexEntry{0, 0, l2}, i)
}