mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-14 17:44:06 -08:00
554 lines
15 KiB
Go
554 lines
15 KiB
Go
// Copyright 2017 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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//go:build !windows
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// +build !windows
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package tsdb
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import (
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"encoding/binary"
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"io"
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"math/rand"
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"os"
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"path"
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"path/filepath"
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"testing"
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"time"
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"github.com/go-kit/log"
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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/storage"
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"github.com/prometheus/prometheus/tsdb/chunks"
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"github.com/prometheus/prometheus/tsdb/record"
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"github.com/prometheus/prometheus/tsdb/tombstones"
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"github.com/prometheus/prometheus/tsdb/wlog"
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)
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func TestSegmentWAL_cut(t *testing.T) {
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tmpdir := t.TempDir()
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// This calls cut() implicitly the first time without a previous tail.
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w, err := OpenSegmentWAL(tmpdir, nil, 0, nil)
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require.NoError(t, err)
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require.NoError(t, w.write(WALEntrySeries, 1, []byte("Hello World!!")))
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require.NoError(t, w.cut())
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// Cutting creates a new file.
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require.Len(t, w.files, 2)
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require.NoError(t, w.write(WALEntrySeries, 1, []byte("Hello World!!")))
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require.NoError(t, w.Close())
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for _, of := range w.files {
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f, err := os.Open(of.Name())
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require.NoError(t, err)
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// Verify header data.
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metab := make([]byte, 8)
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_, err = f.Read(metab)
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require.NoError(t, err)
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require.Equal(t, WALMagic, binary.BigEndian.Uint32(metab[:4]))
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require.Equal(t, WALFormatDefault, metab[4])
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// We cannot actually check for correct pre-allocation as it is
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// optional per filesystem and handled transparently.
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et, flag, b, err := newWALReader(nil, nil).entry(f)
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require.NoError(t, err)
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require.Equal(t, WALEntrySeries, et)
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require.Equal(t, byte(walSeriesSimple), flag)
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require.Equal(t, []byte("Hello World!!"), b)
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}
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}
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func TestSegmentWAL_Truncate(t *testing.T) {
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const (
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numMetrics = 20000
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batch = 100
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)
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series, err := labels.ReadLabels(filepath.Join("testdata", "20kseries.json"), numMetrics)
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require.NoError(t, err)
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dir := t.TempDir()
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w, err := OpenSegmentWAL(dir, nil, 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w)
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w.segmentSize = 10000
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for i := 0; i < numMetrics; i += batch {
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var rs []record.RefSeries
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for j, s := range series[i : i+batch] {
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rs = append(rs, record.RefSeries{Labels: s, Ref: chunks.HeadSeriesRef(i+j) + 1})
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}
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err := w.LogSeries(rs)
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require.NoError(t, err)
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}
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// We mark the 2nd half of the files with a min timestamp that should discard
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// them from the selection of compactable files.
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for i, f := range w.files[len(w.files)/2:] {
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f.maxTime = int64(1000 + i)
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}
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// All series in those files must be preserved regarding of the provided postings list.
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boundarySeries := w.files[len(w.files)/2].minSeries
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// We truncate while keeping every 2nd series.
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keep := map[chunks.HeadSeriesRef]struct{}{}
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for i := 1; i <= numMetrics; i += 2 {
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keep[chunks.HeadSeriesRef(i)] = struct{}{}
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}
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keepf := func(id chunks.HeadSeriesRef) bool {
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_, ok := keep[id]
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return ok
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}
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err = w.Truncate(1000, keepf)
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require.NoError(t, err)
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var expected []record.RefSeries
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for i := 1; i <= numMetrics; i++ {
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if i%2 == 1 || chunks.HeadSeriesRef(i) >= boundarySeries {
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expected = append(expected, record.RefSeries{Ref: chunks.HeadSeriesRef(i), Labels: series[i-1]})
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}
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}
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// Call Truncate once again to see whether we can read the written file without
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// creating a new WAL.
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err = w.Truncate(1000, keepf)
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require.NoError(t, err)
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require.NoError(t, w.Close())
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// The same again with a new WAL.
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w, err = OpenSegmentWAL(dir, nil, 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w)
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var readSeries []record.RefSeries
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r := w.Reader()
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require.NoError(t, r.Read(func(s []record.RefSeries) {
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readSeries = append(readSeries, s...)
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}, nil, nil))
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require.Equal(t, expected, readSeries)
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}
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// Symmetrical test of reading and writing to the WAL via its main interface.
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func TestSegmentWAL_Log_Restore(t *testing.T) {
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const (
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numMetrics = 50
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iterations = 5
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stepSize = 5
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)
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// Generate testing data. It does not make semantic sense but
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// for the purpose of this test.
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series, err := labels.ReadLabels(filepath.Join("testdata", "20kseries.json"), numMetrics)
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require.NoError(t, err)
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dir := t.TempDir()
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var (
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recordedSeries [][]record.RefSeries
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recordedSamples [][]record.RefSample
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recordedDeletes [][]tombstones.Stone
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)
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var totalSamples int
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// Open WAL a bunch of times, validate all previous data can be read,
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// write more data to it, close it.
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for k := 0; k < numMetrics; k += numMetrics / iterations {
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w, err := OpenSegmentWAL(dir, nil, 0, nil)
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require.NoError(t, err)
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// Set smaller segment size so we can actually write several files.
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w.segmentSize = 1000 * 1000
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r := w.Reader()
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var (
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resultSeries [][]record.RefSeries
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resultSamples [][]record.RefSample
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resultDeletes [][]tombstones.Stone
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)
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serf := func(series []record.RefSeries) {
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if len(series) > 0 {
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clsets := make([]record.RefSeries, len(series))
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copy(clsets, series)
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resultSeries = append(resultSeries, clsets)
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}
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}
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smplf := func(smpls []record.RefSample) {
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if len(smpls) > 0 {
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csmpls := make([]record.RefSample, len(smpls))
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copy(csmpls, smpls)
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resultSamples = append(resultSamples, csmpls)
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}
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}
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delf := func(stones []tombstones.Stone) {
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if len(stones) > 0 {
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cst := make([]tombstones.Stone, len(stones))
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copy(cst, stones)
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resultDeletes = append(resultDeletes, cst)
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}
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}
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require.NoError(t, r.Read(serf, smplf, delf))
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require.Equal(t, recordedSamples, resultSamples)
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require.Equal(t, recordedSeries, resultSeries)
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require.Equal(t, recordedDeletes, resultDeletes)
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series := series[k : k+(numMetrics/iterations)]
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// Insert in batches and generate different amounts of samples for each.
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for i := 0; i < len(series); i += stepSize {
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var samples []record.RefSample
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var stones []tombstones.Stone
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for j := 0; j < i*10; j++ {
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samples = append(samples, record.RefSample{
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Ref: chunks.HeadSeriesRef(j % 10000),
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T: int64(j * 2),
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V: rand.Float64(),
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})
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}
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for j := 0; j < i*20; j++ {
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ts := rand.Int63()
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stones = append(stones, tombstones.Stone{Ref: storage.SeriesRef(rand.Uint64()), Intervals: tombstones.Intervals{{Mint: ts, Maxt: ts + rand.Int63n(10000)}}})
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}
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lbls := series[i : i+stepSize]
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series := make([]record.RefSeries, 0, len(series))
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for j, l := range lbls {
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series = append(series, record.RefSeries{
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Ref: chunks.HeadSeriesRef(i + j),
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Labels: l,
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})
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}
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require.NoError(t, w.LogSeries(series))
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require.NoError(t, w.LogSamples(samples))
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require.NoError(t, w.LogDeletes(stones))
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if len(lbls) > 0 {
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recordedSeries = append(recordedSeries, series)
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}
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if len(samples) > 0 {
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recordedSamples = append(recordedSamples, samples)
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totalSamples += len(samples)
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}
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if len(stones) > 0 {
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recordedDeletes = append(recordedDeletes, stones)
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}
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}
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require.NoError(t, w.Close())
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}
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}
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func TestWALRestoreCorrupted_invalidSegment(t *testing.T) {
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dir := t.TempDir()
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wal, err := OpenSegmentWAL(dir, nil, 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(wal)
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_, err = wal.createSegmentFile(filepath.Join(dir, "000000"))
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require.NoError(t, err)
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f, err := wal.createSegmentFile(filepath.Join(dir, "000001"))
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require.NoError(t, err)
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f2, err := wal.createSegmentFile(filepath.Join(dir, "000002"))
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require.NoError(t, err)
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require.NoError(t, f2.Close())
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// Make header of second segment invalid.
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_, err = f.WriteAt([]byte{1, 2, 3, 4}, 0)
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require.NoError(t, err)
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require.NoError(t, f.Close())
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require.NoError(t, wal.Close())
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wal, err = OpenSegmentWAL(dir, log.NewLogfmtLogger(os.Stderr), 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(wal)
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files, err := os.ReadDir(dir)
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require.NoError(t, err)
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fns := []string{}
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for _, f := range files {
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fns = append(fns, f.Name())
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}
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require.Equal(t, []string{"000000"}, fns)
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}
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// Test reading from a WAL that has been corrupted through various means.
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func TestWALRestoreCorrupted(t *testing.T) {
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cases := []struct {
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name string
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f func(*testing.T, *SegmentWAL)
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}{
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{
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name: "truncate_checksum",
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f: func(t *testing.T, w *SegmentWAL) {
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f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666)
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require.NoError(t, err)
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defer f.Close()
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off, err := f.Seek(0, io.SeekEnd)
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require.NoError(t, err)
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require.NoError(t, f.Truncate(off-1))
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},
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},
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{
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name: "truncate_body",
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f: func(t *testing.T, w *SegmentWAL) {
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f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666)
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require.NoError(t, err)
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defer f.Close()
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off, err := f.Seek(0, io.SeekEnd)
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require.NoError(t, err)
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require.NoError(t, f.Truncate(off-8))
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},
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},
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{
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name: "body_content",
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f: func(t *testing.T, w *SegmentWAL) {
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f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666)
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require.NoError(t, err)
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defer f.Close()
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off, err := f.Seek(0, io.SeekEnd)
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require.NoError(t, err)
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// Write junk before checksum starts.
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_, err = f.WriteAt([]byte{1, 2, 3, 4}, off-8)
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require.NoError(t, err)
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},
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},
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{
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name: "checksum",
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f: func(t *testing.T, w *SegmentWAL) {
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f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666)
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require.NoError(t, err)
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defer f.Close()
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off, err := f.Seek(0, io.SeekEnd)
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require.NoError(t, err)
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// Write junk into checksum
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_, err = f.WriteAt([]byte{1, 2, 3, 4}, off-4)
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require.NoError(t, err)
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},
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},
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}
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for _, c := range cases {
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t.Run(c.name, func(t *testing.T) {
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// Generate testing data. It does not make semantic sense but
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// for the purpose of this test.
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dir := t.TempDir()
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w, err := OpenSegmentWAL(dir, nil, 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w)
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require.NoError(t, w.LogSamples([]record.RefSample{{T: 1, V: 2}}))
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require.NoError(t, w.LogSamples([]record.RefSample{{T: 2, V: 3}}))
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require.NoError(t, w.cut())
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// Sleep 2 seconds to avoid error where cut and test "cases" function may write or
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// truncate the file out of orders as "cases" are not synchronized with cut.
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// Hopefully cut will complete by 2 seconds.
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time.Sleep(2 * time.Second)
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require.NoError(t, w.LogSamples([]record.RefSample{{T: 3, V: 4}}))
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require.NoError(t, w.LogSamples([]record.RefSample{{T: 5, V: 6}}))
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require.NoError(t, w.Close())
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// cut() truncates and fsyncs the first segment async. If it happens after
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// the corruption we apply below, the corruption will be overwritten again.
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// Fire and forget a sync to avoid flakiness.
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w.files[0].Sync()
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// Corrupt the second entry in the first file.
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// After re-opening we must be able to read the first entry
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// and the rest, including the second file, must be truncated for clean further
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// writes.
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c.f(t, w)
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logger := log.NewLogfmtLogger(os.Stderr)
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w2, err := OpenSegmentWAL(dir, logger, 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w2)
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r := w2.Reader()
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serf := func(l []record.RefSeries) {
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require.Empty(t, l)
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}
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// Weird hack to check order of reads.
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i := 0
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samplef := func(s []record.RefSample) {
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if i == 0 {
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require.Equal(t, []record.RefSample{{T: 1, V: 2}}, s)
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i++
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} else {
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require.Equal(t, []record.RefSample{{T: 99, V: 100}}, s)
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}
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}
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require.NoError(t, r.Read(serf, samplef, nil))
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require.NoError(t, w2.LogSamples([]record.RefSample{{T: 99, V: 100}}))
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require.NoError(t, w2.Close())
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// We should see the first valid entry and the new one, everything after
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// is truncated.
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w3, err := OpenSegmentWAL(dir, logger, 0, nil)
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require.NoError(t, err)
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defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w3)
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r = w3.Reader()
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i = 0
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require.NoError(t, r.Read(serf, samplef, nil))
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})
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}
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}
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func TestMigrateWAL_Empty(t *testing.T) {
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// The migration procedure must properly deal with a zero-length segment,
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// which is valid in the new format.
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dir := t.TempDir()
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wdir := path.Join(dir, "wal")
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// Initialize empty WAL.
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w, err := wlog.New(nil, nil, wdir, wlog.CompressionNone)
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require.NoError(t, err)
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require.NoError(t, w.Close())
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require.NoError(t, MigrateWAL(nil, wdir))
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}
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func TestMigrateWAL_Fuzz(t *testing.T) {
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dir := t.TempDir()
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wdir := path.Join(dir, "wal")
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// Should pass if no WAL exists yet.
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require.NoError(t, MigrateWAL(nil, wdir))
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oldWAL, err := OpenSegmentWAL(wdir, nil, time.Minute, nil)
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require.NoError(t, err)
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// Write some data.
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require.NoError(t, oldWAL.LogSeries([]record.RefSeries{
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{Ref: 100, Labels: labels.FromStrings("abc", "def", "123", "456")},
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{Ref: 1, Labels: labels.FromStrings("abc", "def2", "1234", "4567")},
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}))
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require.NoError(t, oldWAL.LogSamples([]record.RefSample{
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{Ref: 1, T: 100, V: 200},
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{Ref: 2, T: 300, V: 400},
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}))
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require.NoError(t, oldWAL.LogSeries([]record.RefSeries{
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{Ref: 200, Labels: labels.FromStrings("xyz", "def", "foo", "bar")},
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}))
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require.NoError(t, oldWAL.LogSamples([]record.RefSample{
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{Ref: 3, T: 100, V: 200},
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{Ref: 4, T: 300, V: 400},
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}))
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require.NoError(t, oldWAL.LogDeletes([]tombstones.Stone{
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{Ref: 1, Intervals: []tombstones.Interval{{Mint: 100, Maxt: 200}}},
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}))
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require.NoError(t, oldWAL.Close())
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// Perform migration.
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require.NoError(t, MigrateWAL(nil, wdir))
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w, err := wlog.New(nil, nil, wdir, wlog.CompressionNone)
|
|
require.NoError(t, err)
|
|
|
|
// We can properly write some new data after migration.
|
|
var enc record.Encoder
|
|
require.NoError(t, w.Log(enc.Samples([]record.RefSample{
|
|
{Ref: 500, T: 1, V: 1},
|
|
}, nil)))
|
|
|
|
require.NoError(t, w.Close())
|
|
|
|
// Read back all data.
|
|
sr, err := wlog.NewSegmentsReader(wdir)
|
|
require.NoError(t, err)
|
|
|
|
r := wlog.NewReader(sr)
|
|
var res []interface{}
|
|
var dec record.Decoder
|
|
|
|
for r.Next() {
|
|
rec := r.Record()
|
|
|
|
switch dec.Type(rec) {
|
|
case record.Series:
|
|
s, err := dec.Series(rec, nil)
|
|
require.NoError(t, err)
|
|
res = append(res, s)
|
|
case record.Samples:
|
|
s, err := dec.Samples(rec, nil)
|
|
require.NoError(t, err)
|
|
res = append(res, s)
|
|
case record.Tombstones:
|
|
s, err := dec.Tombstones(rec, nil)
|
|
require.NoError(t, err)
|
|
res = append(res, s)
|
|
default:
|
|
t.Fatalf("unknown record type %d", dec.Type(rec))
|
|
}
|
|
}
|
|
require.NoError(t, r.Err())
|
|
|
|
require.Equal(t, []interface{}{
|
|
[]record.RefSeries{
|
|
{Ref: 100, Labels: labels.FromStrings("abc", "def", "123", "456")},
|
|
{Ref: 1, Labels: labels.FromStrings("abc", "def2", "1234", "4567")},
|
|
},
|
|
[]record.RefSample{{Ref: 1, T: 100, V: 200}, {Ref: 2, T: 300, V: 400}},
|
|
[]record.RefSeries{
|
|
{Ref: 200, Labels: labels.FromStrings("xyz", "def", "foo", "bar")},
|
|
},
|
|
[]record.RefSample{{Ref: 3, T: 100, V: 200}, {Ref: 4, T: 300, V: 400}},
|
|
[]tombstones.Stone{{Ref: 1, Intervals: []tombstones.Interval{{Mint: 100, Maxt: 200}}}},
|
|
[]record.RefSample{{Ref: 500, T: 1, V: 1}},
|
|
}, res)
|
|
|
|
// Migrating an already migrated WAL shouldn't do anything.
|
|
require.NoError(t, MigrateWAL(nil, wdir))
|
|
}
|