510 lines
13 KiB
Go
510 lines
13 KiB
Go
// Copyright 2018 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 remote
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import (
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"fmt"
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"io/ioutil"
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"math/rand"
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"os"
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"path"
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"sync"
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"testing"
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"time"
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"github.com/prometheus/prometheus/util/testutil"
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"github.com/prometheus/tsdb"
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"github.com/prometheus/tsdb/labels"
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"github.com/prometheus/tsdb/wal"
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)
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var defaultRetryInterval = 100 * time.Millisecond
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var defaultRetries = 100
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// retry executes f() n times at each interval until it returns true.
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func retry(t *testing.T, interval time.Duration, n int, f func() bool) {
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t.Helper()
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ticker := time.NewTicker(interval)
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for i := 0; i <= n; i++ {
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if f() {
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return
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}
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<-ticker.C
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}
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ticker.Stop()
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t.Logf("function returned false")
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}
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type writeToMock struct {
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samplesAppended int
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seriesLock sync.Mutex
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seriesSegmentIndexes map[uint64]int
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}
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func (wtm *writeToMock) Append(s []tsdb.RefSample) bool {
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wtm.samplesAppended += len(s)
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return true
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}
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func (wtm *writeToMock) StoreSeries(series []tsdb.RefSeries, index int) {
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wtm.seriesLock.Lock()
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defer wtm.seriesLock.Unlock()
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for _, s := range series {
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wtm.seriesSegmentIndexes[s.Ref] = index
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}
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}
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func (wtm *writeToMock) SeriesReset(index int) {
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// Check for series that are in segments older than the checkpoint
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// that were not also present in the checkpoint.
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wtm.seriesLock.Lock()
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defer wtm.seriesLock.Unlock()
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for k, v := range wtm.seriesSegmentIndexes {
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if v < index {
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delete(wtm.seriesSegmentIndexes, k)
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}
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}
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}
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func (wtm *writeToMock) checkNumLabels() int {
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wtm.seriesLock.Lock()
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defer wtm.seriesLock.Unlock()
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return len(wtm.seriesSegmentIndexes)
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}
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func newWriteToMock() *writeToMock {
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return &writeToMock{
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seriesSegmentIndexes: make(map[uint64]int),
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}
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}
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func TestTailSamples(t *testing.T) {
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pageSize := 32 * 1024
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const seriesCount = 10
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const samplesCount = 250
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now := time.Now()
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dir, err := ioutil.TempDir("", "readCheckpoint")
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testutil.Ok(t, err)
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defer os.RemoveAll(dir)
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wdir := path.Join(dir, "wal")
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err = os.Mkdir(wdir, 0777)
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testutil.Ok(t, err)
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enc := tsdb.RecordEncoder{}
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w, err := wal.NewSize(nil, nil, wdir, 128*pageSize)
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testutil.Ok(t, err)
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// Write to the initial segment then checkpoint.
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for i := 0; i < seriesCount; i++ {
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ref := i + 100
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(ref),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", i)}},
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},
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}, nil)
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testutil.Ok(t, w.Log(series))
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for j := 0; j < samplesCount; j++ {
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inner := rand.Intn(ref + 1)
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(inner),
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T: int64(now.UnixNano()) + 1,
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V: float64(i),
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},
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}, nil)
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testutil.Ok(t, w.Log(sample))
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}
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}
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// Start read after checkpoint, no more data written.
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first, last, err := w.Segments()
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testutil.Ok(t, err)
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wt := newWriteToMock()
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watcher := NewWALWatcher(nil, "", wt, dir)
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watcher.startTime = now.UnixNano()
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// Set the Watcher's metrics so they're not nil pointers.
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watcher.setMetrics()
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for i := first; i <= last; i++ {
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segment, err := wal.OpenReadSegment(wal.SegmentName(watcher.walDir, i))
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testutil.Ok(t, err)
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defer segment.Close()
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reader := wal.NewLiveReader(nil, segment)
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// Use tail true so we can ensure we got the right number of samples.
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watcher.readSegment(reader, i, true)
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}
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expectedSeries := seriesCount
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expectedSamples := seriesCount * samplesCount
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retry(t, defaultRetryInterval, defaultRetries, func() bool {
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return wt.checkNumLabels() >= expectedSeries
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})
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testutil.Equals(t, expectedSeries, wt.checkNumLabels())
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testutil.Equals(t, expectedSamples, wt.samplesAppended)
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}
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func TestReadToEndNoCheckpoint(t *testing.T) {
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pageSize := 32 * 1024
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const seriesCount = 10
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const samplesCount = 250
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dir, err := ioutil.TempDir("", "readToEnd_noCheckpoint")
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testutil.Ok(t, err)
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defer os.RemoveAll(dir)
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wdir := path.Join(dir, "wal")
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err = os.Mkdir(wdir, 0777)
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testutil.Ok(t, err)
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w, err := wal.NewSize(nil, nil, wdir, 128*pageSize)
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testutil.Ok(t, err)
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var recs [][]byte
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enc := tsdb.RecordEncoder{}
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for i := 0; i < seriesCount; i++ {
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(i),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", i)}},
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},
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}, nil)
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recs = append(recs, series)
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for j := 0; j < samplesCount; j++ {
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(j),
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T: int64(i),
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V: float64(i),
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},
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}, nil)
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recs = append(recs, sample)
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// Randomly batch up records.
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if rand.Intn(4) < 3 {
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testutil.Ok(t, w.Log(recs...))
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recs = recs[:0]
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}
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}
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}
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testutil.Ok(t, w.Log(recs...))
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_, _, err = w.Segments()
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testutil.Ok(t, err)
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wt := newWriteToMock()
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watcher := NewWALWatcher(nil, "", wt, dir)
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go watcher.Start()
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expected := seriesCount
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retry(t, defaultRetryInterval, defaultRetries, func() bool {
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return wt.checkNumLabels() >= expected
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})
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watcher.Stop()
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testutil.Equals(t, expected, wt.checkNumLabels())
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}
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func TestReadToEndWithCheckpoint(t *testing.T) {
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segmentSize := 32 * 1024
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// We need something similar to this # of series and samples
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// in order to get enough segments for us to checkpoint.
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const seriesCount = 10
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const samplesCount = 250
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dir, err := ioutil.TempDir("", "readToEnd_withCheckpoint")
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testutil.Ok(t, err)
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defer os.RemoveAll(dir)
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wdir := path.Join(dir, "wal")
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err = os.Mkdir(wdir, 0777)
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testutil.Ok(t, err)
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enc := tsdb.RecordEncoder{}
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w, err := wal.NewSize(nil, nil, wdir, segmentSize)
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testutil.Ok(t, err)
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// Write to the initial segment then checkpoint.
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for i := 0; i < seriesCount; i++ {
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ref := i + 100
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(ref),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", i)}},
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},
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}, nil)
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testutil.Ok(t, w.Log(series))
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for j := 0; j < samplesCount; j++ {
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inner := rand.Intn(ref + 1)
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(inner),
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T: int64(i),
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V: float64(i),
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},
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}, nil)
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testutil.Ok(t, w.Log(sample))
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}
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}
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tsdb.Checkpoint(w, 0, 1, func(x uint64) bool { return true }, 0)
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w.Truncate(1)
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// Write more records after checkpointing.
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for i := 0; i < seriesCount; i++ {
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(i),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", i)}},
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},
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}, nil)
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testutil.Ok(t, w.Log(series))
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for j := 0; j < samplesCount; j++ {
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(j),
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T: int64(i),
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V: float64(i),
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},
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}, nil)
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testutil.Ok(t, w.Log(sample))
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}
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}
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_, _, err = w.Segments()
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testutil.Ok(t, err)
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wt := newWriteToMock()
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watcher := NewWALWatcher(nil, "", wt, dir)
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go watcher.Start()
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expected := seriesCount * 2
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retry(t, defaultRetryInterval, defaultRetries, func() bool {
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return wt.checkNumLabels() >= expected
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})
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watcher.Stop()
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testutil.Equals(t, expected, wt.checkNumLabels())
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}
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func TestReadCheckpoint(t *testing.T) {
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pageSize := 32 * 1024
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const seriesCount = 10
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const samplesCount = 250
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dir, err := ioutil.TempDir("", "readCheckpoint")
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testutil.Ok(t, err)
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defer os.RemoveAll(dir)
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wdir := path.Join(dir, "wal")
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err = os.Mkdir(wdir, 0777)
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testutil.Ok(t, err)
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os.Create(wal.SegmentName(wdir, 30))
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enc := tsdb.RecordEncoder{}
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w, err := wal.NewSize(nil, nil, wdir, 128*pageSize)
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testutil.Ok(t, err)
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// Write to the initial segment then checkpoint.
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for i := 0; i < seriesCount; i++ {
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ref := i + 100
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(ref),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", i)}},
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},
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}, nil)
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testutil.Ok(t, w.Log(series))
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for j := 0; j < samplesCount; j++ {
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inner := rand.Intn(ref + 1)
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(inner),
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T: int64(i),
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V: float64(i),
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},
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}, nil)
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testutil.Ok(t, w.Log(sample))
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}
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}
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tsdb.Checkpoint(w, 30, 31, func(x uint64) bool { return true }, 0)
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w.Truncate(32)
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// Start read after checkpoint, no more data written.
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_, _, err = w.Segments()
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testutil.Ok(t, err)
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wt := newWriteToMock()
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watcher := NewWALWatcher(nil, "", wt, dir)
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// watcher.
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go watcher.Start()
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expectedSeries := seriesCount
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retry(t, defaultRetryInterval, defaultRetries, func() bool {
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return wt.checkNumLabels() >= expectedSeries
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})
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watcher.Stop()
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testutil.Equals(t, expectedSeries, wt.checkNumLabels())
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}
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func TestReadCheckpointMultipleSegments(t *testing.T) {
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pageSize := 32 * 1024
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const segments = 1
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const seriesCount = 20
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const samplesCount = 300
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dir, err := ioutil.TempDir("", "readCheckpoint")
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testutil.Ok(t, err)
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defer os.RemoveAll(dir)
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wdir := path.Join(dir, "wal")
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err = os.Mkdir(wdir, 0777)
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testutil.Ok(t, err)
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enc := tsdb.RecordEncoder{}
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w, err := wal.NewSize(nil, nil, wdir, pageSize)
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testutil.Ok(t, err)
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// Write a bunch of data.
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for i := 0; i < segments; i++ {
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for j := 0; j < seriesCount; j++ {
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ref := j + (i * 100)
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(ref),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", j)}},
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},
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}, nil)
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testutil.Ok(t, w.Log(series))
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for k := 0; k < samplesCount; k++ {
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inner := rand.Intn(ref + 1)
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(inner),
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T: int64(i),
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V: float64(i),
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},
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}, nil)
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testutil.Ok(t, w.Log(sample))
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}
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}
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}
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// At this point we should have at least 6 segments, lets create a checkpoint dir of the first 5.
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checkpointDir := dir + "/wal/checkpoint.000004"
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err = os.Mkdir(checkpointDir, 0777)
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testutil.Ok(t, err)
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for i := 0; i <= 4; i++ {
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err := os.Rename(wal.SegmentName(dir+"/wal", i), wal.SegmentName(checkpointDir, i))
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testutil.Ok(t, err)
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}
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wt := newWriteToMock()
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watcher := NewWALWatcher(nil, "", wt, dir)
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watcher.maxSegment = -1
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// Set the Watcher's metrics so they're not nil pointers.
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watcher.setMetrics()
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lastCheckpoint, _, err := tsdb.LastCheckpoint(watcher.walDir)
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testutil.Ok(t, err)
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err = watcher.readCheckpoint(lastCheckpoint)
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testutil.Ok(t, err)
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}
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func TestCheckpointSeriesReset(t *testing.T) {
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segmentSize := 32 * 1024
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// We need something similar to this # of series and samples
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// in order to get enough segments for us to checkpoint.
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const seriesCount = 20
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const samplesCount = 350
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dir, err := ioutil.TempDir("", "seriesReset")
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testutil.Ok(t, err)
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defer os.RemoveAll(dir)
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wdir := path.Join(dir, "wal")
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err = os.Mkdir(wdir, 0777)
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testutil.Ok(t, err)
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enc := tsdb.RecordEncoder{}
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w, err := wal.NewSize(nil, nil, wdir, segmentSize)
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testutil.Ok(t, err)
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// Write to the initial segment, then checkpoint later.
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for i := 0; i < seriesCount; i++ {
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ref := i + 100
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series := enc.Series([]tsdb.RefSeries{
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tsdb.RefSeries{
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Ref: uint64(ref),
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Labels: labels.Labels{labels.Label{Name: "__name__", Value: fmt.Sprintf("metric_%d", i)}},
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},
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}, nil)
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testutil.Ok(t, w.Log(series))
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for j := 0; j < samplesCount; j++ {
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inner := rand.Intn(ref + 1)
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sample := enc.Samples([]tsdb.RefSample{
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tsdb.RefSample{
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Ref: uint64(inner),
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T: int64(i),
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V: float64(i),
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},
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}, nil)
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testutil.Ok(t, w.Log(sample))
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}
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}
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_, _, err = w.Segments()
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testutil.Ok(t, err)
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wt := newWriteToMock()
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watcher := NewWALWatcher(nil, "", wt, dir)
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watcher.maxSegment = -1
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go watcher.Start()
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expected := seriesCount
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retry(t, defaultRetryInterval, defaultRetries, func() bool {
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return wt.checkNumLabels() >= expected
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})
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testutil.Equals(t, seriesCount, wt.checkNumLabels())
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_, err = tsdb.Checkpoint(w, 2, 4, func(x uint64) bool { return true }, 0)
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testutil.Ok(t, err)
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err = w.Truncate(5)
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testutil.Ok(t, err)
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_, cpi, err := tsdb.LastCheckpoint(path.Join(dir, "wal"))
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testutil.Ok(t, err)
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err = watcher.garbageCollectSeries(cpi + 1)
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testutil.Ok(t, err)
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watcher.Stop()
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// If you modify the checkpoint and truncate segment #'s run the test to see how
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// many series records you end up with and change the last Equals check accordingly
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// or modify the Equals to Assert(len(wt.seriesLabels) < seriesCount*10)
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testutil.Equals(t, 14, wt.checkNumLabels())
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}
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