From 87edf1f960d2e3b59b0f82026fa3283e4e8f21e4 Mon Sep 17 00:00:00 2001 From: Bryan Boreham Date: Wed, 13 Mar 2024 15:57:23 +0000 Subject: [PATCH] [Cleanup] TSDB: Remove old deprecated WAL implementation Deprecated since 2018. Signed-off-by: Bryan Boreham --- tsdb/db.go | 4 - tsdb/db_test.go | 2 +- tsdb/wal.go | 1303 ---------------------------------------------- tsdb/wal_test.go | 553 -------------------- 4 files changed, 1 insertion(+), 1861 deletions(-) delete mode 100644 tsdb/wal.go delete mode 100644 tsdb/wal_test.go diff --git a/tsdb/db.go b/tsdb/db.go index 4998da6aa..7aa68da50 100644 --- a/tsdb/db.go +++ b/tsdb/db.go @@ -779,10 +779,6 @@ func open(dir string, l log.Logger, r prometheus.Registerer, opts *Options, rngs walDir := filepath.Join(dir, "wal") wblDir := filepath.Join(dir, wlog.WblDirName) - // Migrate old WAL if one exists. - if err := MigrateWAL(l, walDir); err != nil { - return nil, fmt.Errorf("migrate WAL: %w", err) - } for _, tmpDir := range []string{walDir, dir} { // Remove tmp dirs. if err := removeBestEffortTmpDirs(l, tmpDir); err != nil { diff --git a/tsdb/db_test.go b/tsdb/db_test.go index 45a16b8ba..b1171b349 100644 --- a/tsdb/db_test.go +++ b/tsdb/db_test.go @@ -3598,7 +3598,7 @@ func testChunkQuerierShouldNotPanicIfHeadChunkIsTruncatedWhileReadingQueriedChun // just to iterate through the bytes slice. We don't really care the reason why // we read this data, we just need to read it to make sure the memory address // of the []byte is still valid. - chkCRC32 := newCRC32() + chkCRC32 := crc32.New(crc32.MakeTable(crc32.Castagnoli)) for _, chunk := range chunks { chkCRC32.Reset() _, err := chkCRC32.Write(chunk.Bytes()) diff --git a/tsdb/wal.go b/tsdb/wal.go deleted file mode 100644 index e06a8aea5..000000000 --- a/tsdb/wal.go +++ /dev/null @@ -1,1303 +0,0 @@ -// Copyright 2017 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 ( - "bufio" - "encoding/binary" - "errors" - "fmt" - "hash" - "hash/crc32" - "io" - "math" - "os" - "path/filepath" - "sync" - "time" - - "github.com/go-kit/log" - "github.com/go-kit/log/level" - "github.com/prometheus/client_golang/prometheus" - - "github.com/prometheus/prometheus/model/labels" - "github.com/prometheus/prometheus/storage" - "github.com/prometheus/prometheus/tsdb/chunks" - "github.com/prometheus/prometheus/tsdb/encoding" - "github.com/prometheus/prometheus/tsdb/fileutil" - "github.com/prometheus/prometheus/tsdb/record" - "github.com/prometheus/prometheus/tsdb/tombstones" - "github.com/prometheus/prometheus/tsdb/wlog" - "github.com/prometheus/prometheus/util/zeropool" -) - -// WALEntryType indicates what data a WAL entry contains. -type WALEntryType uint8 - -const ( - // WALMagic is a 4 byte number every WAL segment file starts with. - WALMagic = uint32(0x43AF00EF) - - // WALFormatDefault is the version flag for the default outer segment file format. - WALFormatDefault = byte(1) -) - -// Entry types in a segment file. -const ( - WALEntrySymbols WALEntryType = 1 - WALEntrySeries WALEntryType = 2 - WALEntrySamples WALEntryType = 3 - WALEntryDeletes WALEntryType = 4 -) - -type walMetrics struct { - fsyncDuration prometheus.Summary - corruptions prometheus.Counter -} - -func newWalMetrics(r prometheus.Registerer) *walMetrics { - m := &walMetrics{} - - m.fsyncDuration = prometheus.NewSummary(prometheus.SummaryOpts{ - Name: "prometheus_tsdb_wal_fsync_duration_seconds", - Help: "Duration of WAL fsync.", - Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001}, - }) - m.corruptions = prometheus.NewCounter(prometheus.CounterOpts{ - Name: "prometheus_tsdb_wal_corruptions_total", - Help: "Total number of WAL corruptions.", - }) - - if r != nil { - r.MustRegister( - m.fsyncDuration, - m.corruptions, - ) - } - return m -} - -// WAL is a write ahead log that can log new series labels and samples. -// It must be completely read before new entries are logged. -// -// Deprecated: use wlog pkg combined with the record codex instead. -type WAL interface { - Reader() WALReader - LogSeries([]record.RefSeries) error - LogSamples([]record.RefSample) error - LogDeletes([]tombstones.Stone) error - Truncate(mint int64, keep func(uint64) bool) error - Close() error -} - -// WALReader reads entries from a WAL. -type WALReader interface { - Read( - seriesf func([]record.RefSeries), - samplesf func([]record.RefSample), - deletesf func([]tombstones.Stone), - ) error -} - -// segmentFile wraps a file object of a segment and tracks the highest timestamp -// it contains. During WAL truncating, all segments with no higher timestamp than -// the truncation threshold can be compacted. -type segmentFile struct { - *os.File - maxTime int64 // highest tombstone or sample timestamp in segment - minSeries chunks.HeadSeriesRef // lowerst series ID in segment -} - -func newSegmentFile(f *os.File) *segmentFile { - return &segmentFile{ - File: f, - maxTime: math.MinInt64, - minSeries: math.MaxUint64, - } -} - -const ( - walSegmentSizeBytes = 256 * 1024 * 1024 // 256 MB -) - -// The table gets initialized with sync.Once but may still cause a race -// with any other use of the crc32 package anywhere. Thus we initialize it -// before. -var castagnoliTable *crc32.Table - -func init() { - castagnoliTable = crc32.MakeTable(crc32.Castagnoli) -} - -// newCRC32 initializes a CRC32 hash with a preconfigured polynomial, so the -// polynomial may be easily changed in one location at a later time, if necessary. -func newCRC32() hash.Hash32 { - return crc32.New(castagnoliTable) -} - -// SegmentWAL is a write ahead log for series data. -// -// Deprecated: use wlog pkg combined with the record coders instead. -type SegmentWAL struct { - mtx sync.Mutex - metrics *walMetrics - - dirFile *os.File - files []*segmentFile - - logger log.Logger - flushInterval time.Duration - segmentSize int64 - - crc32 hash.Hash32 - cur *bufio.Writer - curN int64 - - stopc chan struct{} - donec chan struct{} - actorc chan func() error // sequentialized background operations - buffers sync.Pool -} - -// OpenSegmentWAL opens or creates a write ahead log in the given directory. -// The WAL must be read completely before new data is written. -func OpenSegmentWAL(dir string, logger log.Logger, flushInterval time.Duration, r prometheus.Registerer) (*SegmentWAL, error) { - if err := os.MkdirAll(dir, 0o777); err != nil { - return nil, err - } - df, err := fileutil.OpenDir(dir) - if err != nil { - return nil, err - } - if logger == nil { - logger = log.NewNopLogger() - } - - w := &SegmentWAL{ - dirFile: df, - logger: logger, - flushInterval: flushInterval, - donec: make(chan struct{}), - stopc: make(chan struct{}), - actorc: make(chan func() error, 2), - segmentSize: walSegmentSizeBytes, - crc32: newCRC32(), - } - w.metrics = newWalMetrics(r) - - fns, err := sequenceFiles(w.dirFile.Name()) - if err != nil { - return nil, err - } - - for i, fn := range fns { - f, err := w.openSegmentFile(fn) - if err == nil { - w.files = append(w.files, newSegmentFile(f)) - continue - } - level.Warn(logger).Log("msg", "Invalid segment file detected, truncating WAL", "err", err, "file", fn) - - for _, fn := range fns[i:] { - if err := os.Remove(fn); err != nil { - return w, fmt.Errorf("removing segment failed: %w", err) - } - } - break - } - - go w.run(flushInterval) - - return w, nil -} - -// repairingWALReader wraps a WAL reader and truncates its underlying SegmentWAL after the last -// valid entry if it encounters corruption. -type repairingWALReader struct { - wal *SegmentWAL - r WALReader -} - -func (r *repairingWALReader) Read( - seriesf func([]record.RefSeries), - samplesf func([]record.RefSample), - deletesf func([]tombstones.Stone), -) error { - err := r.r.Read(seriesf, samplesf, deletesf) - if err == nil { - return nil - } - var cerr *walCorruptionErr - if !errors.As(err, &cerr) { - return err - } - r.wal.metrics.corruptions.Inc() - return r.wal.truncate(cerr.err, cerr.file, cerr.lastOffset) -} - -// truncate the WAL after the last valid entry. -func (w *SegmentWAL) truncate(err error, file int, lastOffset int64) error { - level.Error(w.logger).Log("msg", "WAL corruption detected; truncating", - "err", err, "file", w.files[file].Name(), "pos", lastOffset) - - // Close and delete all files after the current one. - for _, f := range w.files[file+1:] { - if err := f.Close(); err != nil { - return err - } - if err := os.Remove(f.Name()); err != nil { - return err - } - } - w.mtx.Lock() - defer w.mtx.Unlock() - - w.files = w.files[:file+1] - - // Seek the current file to the last valid offset where we continue writing from. - _, err = w.files[file].Seek(lastOffset, io.SeekStart) - return err -} - -// Reader returns a new reader over the write ahead log data. -// It must be completely consumed before writing to the WAL. -func (w *SegmentWAL) Reader() WALReader { - return &repairingWALReader{ - wal: w, - r: newWALReader(w.files, w.logger), - } -} - -func (w *SegmentWAL) getBuffer() *encoding.Encbuf { - b := w.buffers.Get() - if b == nil { - return &encoding.Encbuf{B: make([]byte, 0, 64*1024)} - } - return b.(*encoding.Encbuf) -} - -func (w *SegmentWAL) putBuffer(b *encoding.Encbuf) { - b.Reset() - w.buffers.Put(b) -} - -// Truncate deletes the values prior to mint and the series which the keep function -// does not indicate to preserve. -func (w *SegmentWAL) Truncate(mint int64, keep func(chunks.HeadSeriesRef) bool) error { - // The last segment is always active. - if len(w.files) < 2 { - return nil - } - var candidates []*segmentFile - - // All files have to be traversed as there could be two segments for a block - // with first block having times (10000, 20000) and SECOND one having (0, 10000). - for _, sf := range w.files[:len(w.files)-1] { - if sf.maxTime >= mint { - break - } - // Past WAL files are closed. We have to reopen them for another read. - f, err := w.openSegmentFile(sf.Name()) - if err != nil { - return fmt.Errorf("open old WAL segment for read: %w", err) - } - candidates = append(candidates, &segmentFile{ - File: f, - minSeries: sf.minSeries, - maxTime: sf.maxTime, - }) - } - if len(candidates) == 0 { - return nil - } - - r := newWALReader(candidates, w.logger) - - // Create a new tmp file. - f, err := w.createSegmentFile(filepath.Join(w.dirFile.Name(), "compact.tmp")) - if err != nil { - return fmt.Errorf("create compaction segment: %w", err) - } - defer func() { - if err := os.RemoveAll(f.Name()); err != nil { - level.Error(w.logger).Log("msg", "remove tmp file", "err", err.Error()) - } - }() - - var ( - csf = newSegmentFile(f) - crc32 = newCRC32() - decSeries = []record.RefSeries{} - activeSeries = []record.RefSeries{} - ) - - for r.next() { - rt, flag, byt := r.at() - - if rt != WALEntrySeries { - continue - } - decSeries = decSeries[:0] - activeSeries = activeSeries[:0] - - err := r.decodeSeries(flag, byt, &decSeries) - if err != nil { - return fmt.Errorf("decode samples while truncating: %w", err) - } - for _, s := range decSeries { - if keep(s.Ref) { - activeSeries = append(activeSeries, s) - } - } - - buf := w.getBuffer() - flag = w.encodeSeries(buf, activeSeries) - - _, err = w.writeTo(csf, crc32, WALEntrySeries, flag, buf.Get()) - w.putBuffer(buf) - - if err != nil { - return fmt.Errorf("write to compaction segment: %w", err) - } - } - if err := r.Err(); err != nil { - return fmt.Errorf("read candidate WAL files: %w", err) - } - - off, err := csf.Seek(0, io.SeekCurrent) - if err != nil { - return err - } - if err := csf.Truncate(off); err != nil { - return err - } - if err := csf.Sync(); err != nil { - return nil - } - if err := csf.Close(); err != nil { - return nil - } - - _ = candidates[0].Close() // need close before remove on platform windows - if err := fileutil.Replace(csf.Name(), candidates[0].Name()); err != nil { - return fmt.Errorf("rename compaction segment: %w", err) - } - for _, f := range candidates[1:] { - f.Close() // need close before remove on platform windows - if err := os.RemoveAll(f.Name()); err != nil { - return fmt.Errorf("delete WAL segment file: %w", err) - } - } - if err := w.dirFile.Sync(); err != nil { - return err - } - - // The file object of csf still holds the name before rename. Recreate it so - // subsequent truncations do not look at a non-existent file name. - csf.File, err = w.openSegmentFile(candidates[0].Name()) - if err != nil { - return err - } - // We don't need it to be open. - if err := csf.Close(); err != nil { - return err - } - - w.mtx.Lock() - w.files = append([]*segmentFile{csf}, w.files[len(candidates):]...) - w.mtx.Unlock() - - return nil -} - -// LogSeries writes a batch of new series labels to the log. -// The series have to be ordered. -func (w *SegmentWAL) LogSeries(series []record.RefSeries) error { - buf := w.getBuffer() - - flag := w.encodeSeries(buf, series) - - w.mtx.Lock() - defer w.mtx.Unlock() - - err := w.write(WALEntrySeries, flag, buf.Get()) - - w.putBuffer(buf) - - if err != nil { - return fmt.Errorf("log series: %w", err) - } - - tf := w.head() - - for _, s := range series { - if tf.minSeries > s.Ref { - tf.minSeries = s.Ref - } - } - return nil -} - -// LogSamples writes a batch of new samples to the log. -func (w *SegmentWAL) LogSamples(samples []record.RefSample) error { - buf := w.getBuffer() - - flag := w.encodeSamples(buf, samples) - - w.mtx.Lock() - defer w.mtx.Unlock() - - err := w.write(WALEntrySamples, flag, buf.Get()) - - w.putBuffer(buf) - - if err != nil { - return fmt.Errorf("log series: %w", err) - } - tf := w.head() - - for _, s := range samples { - if tf.maxTime < s.T { - tf.maxTime = s.T - } - } - return nil -} - -// LogDeletes write a batch of new deletes to the log. -func (w *SegmentWAL) LogDeletes(stones []tombstones.Stone) error { - buf := w.getBuffer() - - flag := w.encodeDeletes(buf, stones) - - w.mtx.Lock() - defer w.mtx.Unlock() - - err := w.write(WALEntryDeletes, flag, buf.Get()) - - w.putBuffer(buf) - - if err != nil { - return fmt.Errorf("log series: %w", err) - } - tf := w.head() - - for _, s := range stones { - for _, iv := range s.Intervals { - if tf.maxTime < iv.Maxt { - tf.maxTime = iv.Maxt - } - } - } - return nil -} - -// openSegmentFile opens the given segment file and consumes and validates header. -func (w *SegmentWAL) openSegmentFile(name string) (*os.File, error) { - // We must open all files in read/write mode as we may have to truncate along - // the way and any file may become the head. - f, err := os.OpenFile(name, os.O_RDWR, 0o666) - if err != nil { - return nil, err - } - metab := make([]byte, 8) - - // If there is an error, we need close f for platform windows before gc. - // Otherwise, file op may fail. - hasError := true - defer func() { - if hasError { - f.Close() - } - }() - - switch n, err := f.Read(metab); { - case err != nil: - return nil, fmt.Errorf("validate meta %q: %w", f.Name(), err) - case n != 8: - return nil, fmt.Errorf("invalid header size %d in %q", n, f.Name()) - } - - if m := binary.BigEndian.Uint32(metab[:4]); m != WALMagic { - return nil, fmt.Errorf("invalid magic header %x in %q", m, f.Name()) - } - if metab[4] != WALFormatDefault { - return nil, fmt.Errorf("unknown WAL segment format %d in %q", metab[4], f.Name()) - } - hasError = false - return f, nil -} - -// createSegmentFile creates a new segment file with the given name. It preallocates -// the standard segment size if possible and writes the header. -func (w *SegmentWAL) createSegmentFile(name string) (*os.File, error) { - f, err := os.Create(name) - if err != nil { - return nil, err - } - if err = fileutil.Preallocate(f, w.segmentSize, true); err != nil { - return nil, err - } - // Write header metadata for new file. - metab := make([]byte, 8) - binary.BigEndian.PutUint32(metab[:4], WALMagic) - metab[4] = WALFormatDefault - - if _, err := f.Write(metab); err != nil { - return nil, err - } - return f, err -} - -// cut finishes the currently active segments and opens the next one. -// The encoder is reset to point to the new segment. -func (w *SegmentWAL) cut() error { - // Sync current head to disk and close. - if hf := w.head(); hf != nil { - if err := w.flush(); err != nil { - return err - } - // Finish last segment asynchronously to not block the WAL moving along - // in the new segment. - go func() { - w.actorc <- func() error { - off, err := hf.Seek(0, io.SeekCurrent) - if err != nil { - return fmt.Errorf("finish old segment %s: %w", hf.Name(), err) - } - if err := hf.Truncate(off); err != nil { - return fmt.Errorf("finish old segment %s: %w", hf.Name(), err) - } - if err := hf.Sync(); err != nil { - return fmt.Errorf("finish old segment %s: %w", hf.Name(), err) - } - if err := hf.Close(); err != nil { - return fmt.Errorf("finish old segment %s: %w", hf.Name(), err) - } - return nil - } - }() - } - - p, _, err := nextSequenceFile(w.dirFile.Name()) - if err != nil { - return err - } - f, err := w.createSegmentFile(p) - if err != nil { - return err - } - - go func() { - w.actorc <- func() error { - if err := w.dirFile.Sync(); err != nil { - return fmt.Errorf("sync WAL directory: %w", err) - } - return nil - } - }() - - w.files = append(w.files, newSegmentFile(f)) - - // TODO(gouthamve): make the buffer size a constant. - w.cur = bufio.NewWriterSize(f, 8*1024*1024) - w.curN = 8 - - return nil -} - -func (w *SegmentWAL) head() *segmentFile { - if len(w.files) == 0 { - return nil - } - return w.files[len(w.files)-1] -} - -// Sync flushes the changes to disk. -func (w *SegmentWAL) Sync() error { - var head *segmentFile - var err error - - // Flush the writer and retrieve the reference to the head segment under mutex lock. - func() { - w.mtx.Lock() - defer w.mtx.Unlock() - if err = w.flush(); err != nil { - return - } - head = w.head() - }() - if err != nil { - return fmt.Errorf("flush buffer: %w", err) - } - if head != nil { - // But only fsync the head segment after releasing the mutex as it will block on disk I/O. - start := time.Now() - err := fileutil.Fdatasync(head.File) - w.metrics.fsyncDuration.Observe(time.Since(start).Seconds()) - return err - } - return nil -} - -func (w *SegmentWAL) sync() error { - if err := w.flush(); err != nil { - return err - } - if w.head() == nil { - return nil - } - - start := time.Now() - err := fileutil.Fdatasync(w.head().File) - w.metrics.fsyncDuration.Observe(time.Since(start).Seconds()) - return err -} - -func (w *SegmentWAL) flush() error { - if w.cur == nil { - return nil - } - return w.cur.Flush() -} - -func (w *SegmentWAL) run(interval time.Duration) { - var tick <-chan time.Time - - if interval > 0 { - ticker := time.NewTicker(interval) - defer ticker.Stop() - tick = ticker.C - } - defer close(w.donec) - - for { - // Processing all enqueued operations has precedence over shutdown and - // background syncs. - select { - case f := <-w.actorc: - if err := f(); err != nil { - level.Error(w.logger).Log("msg", "operation failed", "err", err) - } - continue - default: - } - select { - case <-w.stopc: - return - case f := <-w.actorc: - if err := f(); err != nil { - level.Error(w.logger).Log("msg", "operation failed", "err", err) - } - case <-tick: - if err := w.Sync(); err != nil { - level.Error(w.logger).Log("msg", "sync failed", "err", err) - } - } - } -} - -// Close syncs all data and closes the underlying resources. -func (w *SegmentWAL) Close() error { - // Make sure you can call Close() multiple times. - select { - case <-w.stopc: - return nil // Already closed. - default: - } - - close(w.stopc) - <-w.donec - - w.mtx.Lock() - defer w.mtx.Unlock() - - if err := w.sync(); err != nil { - return err - } - // On opening, a WAL must be fully consumed once. Afterwards - // only the current segment will still be open. - if hf := w.head(); hf != nil { - if err := hf.Close(); err != nil { - return fmt.Errorf("closing WAL head %s: %w", hf.Name(), err) - } - } - if err := w.dirFile.Close(); err != nil { - return fmt.Errorf("closing WAL dir %s: %w", w.dirFile.Name(), err) - } - return nil -} - -func (w *SegmentWAL) write(t WALEntryType, flag uint8, buf []byte) error { - // Cut to the next segment if the entry exceeds the file size unless it would also - // exceed the size of a new segment. - // TODO(gouthamve): Add a test for this case where the commit is greater than segmentSize. - var ( - sz = int64(len(buf)) + 6 - newsz = w.curN + sz - ) - // XXX(fabxc): this currently cuts a new file whenever the WAL was newly opened. - // Probably fine in general but may yield a lot of short files in some cases. - if w.cur == nil || w.curN > w.segmentSize || newsz > w.segmentSize && sz <= w.segmentSize { - if err := w.cut(); err != nil { - return err - } - } - n, err := w.writeTo(w.cur, w.crc32, t, flag, buf) - - w.curN += int64(n) - - return err -} - -func (w *SegmentWAL) writeTo(wr io.Writer, crc32 hash.Hash, t WALEntryType, flag uint8, buf []byte) (int, error) { - if len(buf) == 0 { - return 0, nil - } - crc32.Reset() - wr = io.MultiWriter(crc32, wr) - - var b [6]byte - b[0] = byte(t) - b[1] = flag - - binary.BigEndian.PutUint32(b[2:], uint32(len(buf))) - - n1, err := wr.Write(b[:]) - if err != nil { - return n1, err - } - n2, err := wr.Write(buf) - if err != nil { - return n1 + n2, err - } - n3, err := wr.Write(crc32.Sum(b[:0])) - - return n1 + n2 + n3, err -} - -const ( - walSeriesSimple = 1 - walSamplesSimple = 1 - walDeletesSimple = 1 -) - -func (w *SegmentWAL) encodeSeries(buf *encoding.Encbuf, series []record.RefSeries) uint8 { - for _, s := range series { - buf.PutBE64(uint64(s.Ref)) - record.EncodeLabels(buf, s.Labels) - } - return walSeriesSimple -} - -func (w *SegmentWAL) encodeSamples(buf *encoding.Encbuf, samples []record.RefSample) uint8 { - if len(samples) == 0 { - return walSamplesSimple - } - // Store base timestamp and base reference number of first sample. - // All samples encode their timestamp and ref as delta to those. - // - // TODO(fabxc): optimize for all samples having the same timestamp. - first := samples[0] - - buf.PutBE64(uint64(first.Ref)) - buf.PutBE64int64(first.T) - - for _, s := range samples { - buf.PutVarint64(int64(s.Ref) - int64(first.Ref)) - buf.PutVarint64(s.T - first.T) - buf.PutBE64(math.Float64bits(s.V)) - } - return walSamplesSimple -} - -func (w *SegmentWAL) encodeDeletes(buf *encoding.Encbuf, stones []tombstones.Stone) uint8 { - for _, s := range stones { - for _, iv := range s.Intervals { - buf.PutBE64(uint64(s.Ref)) - buf.PutVarint64(iv.Mint) - buf.PutVarint64(iv.Maxt) - } - } - return walDeletesSimple -} - -// walReader decodes and emits write ahead log entries. -type walReader struct { - logger log.Logger - - files []*segmentFile - cur int - buf []byte - crc32 hash.Hash32 - dec record.Decoder - - curType WALEntryType - curFlag byte - curBuf []byte - lastOffset int64 // offset after last successfully read entry - - err error -} - -func newWALReader(files []*segmentFile, l log.Logger) *walReader { - if l == nil { - l = log.NewNopLogger() - } - return &walReader{ - logger: l, - files: files, - buf: make([]byte, 0, 128*4096), - crc32: newCRC32(), - dec: record.NewDecoder(labels.NewSymbolTable()), - } -} - -// Err returns the last error the reader encountered. -func (r *walReader) Err() error { - return r.err -} - -func (r *walReader) Read( - seriesf func([]record.RefSeries), - samplesf func([]record.RefSample), - deletesf func([]tombstones.Stone), -) error { - // Concurrency for replaying the WAL is very limited. We at least split out decoding and - // processing into separate threads. - // Historically, the processing is the bottleneck with reading and decoding using only - // 15% of the CPU. - var ( - seriesPool zeropool.Pool[[]record.RefSeries] - samplePool zeropool.Pool[[]record.RefSample] - deletePool zeropool.Pool[[]tombstones.Stone] - ) - donec := make(chan struct{}) - datac := make(chan interface{}, 100) - - go func() { - defer close(donec) - - for x := range datac { - switch v := x.(type) { - case []record.RefSeries: - if seriesf != nil { - seriesf(v) - } - seriesPool.Put(v[:0]) - case []record.RefSample: - if samplesf != nil { - samplesf(v) - } - samplePool.Put(v[:0]) - case []tombstones.Stone: - if deletesf != nil { - deletesf(v) - } - deletePool.Put(v[:0]) - default: - level.Error(r.logger).Log("msg", "unexpected data type") - } - } - }() - - var err error - - for r.next() { - et, flag, b := r.at() - - // In decoding below we never return a walCorruptionErr for now. - // Those should generally be caught by entry decoding before. - switch et { - case WALEntrySeries: - series := seriesPool.Get() - if series == nil { - series = make([]record.RefSeries, 0, 512) - } - - err = r.decodeSeries(flag, b, &series) - if err != nil { - err = fmt.Errorf("decode series entry: %w", err) - break - } - datac <- series - - cf := r.current() - for _, s := range series { - if cf.minSeries > s.Ref { - cf.minSeries = s.Ref - } - } - case WALEntrySamples: - samples := samplePool.Get() - if samples == nil { - samples = make([]record.RefSample, 0, 512) - } - - err = r.decodeSamples(flag, b, &samples) - if err != nil { - err = fmt.Errorf("decode samples entry: %w", err) - break - } - datac <- samples - - // Update the times for the WAL segment file. - cf := r.current() - for _, s := range samples { - if cf.maxTime < s.T { - cf.maxTime = s.T - } - } - case WALEntryDeletes: - deletes := deletePool.Get() - if deletes == nil { - deletes = make([]tombstones.Stone, 0, 512) - } - - err = r.decodeDeletes(flag, b, &deletes) - if err != nil { - err = fmt.Errorf("decode delete entry: %w", err) - break - } - datac <- deletes - - // Update the times for the WAL segment file. - cf := r.current() - for _, s := range deletes { - for _, iv := range s.Intervals { - if cf.maxTime < iv.Maxt { - cf.maxTime = iv.Maxt - } - } - } - } - } - close(datac) - <-donec - - if err != nil { - return err - } - if err := r.Err(); err != nil { - return fmt.Errorf("read entry: %w", err) - } - return nil -} - -func (r *walReader) at() (WALEntryType, byte, []byte) { - return r.curType, r.curFlag, r.curBuf -} - -// next returns decodes the next entry pair and returns true -// if it was successful. -func (r *walReader) next() bool { - if r.cur >= len(r.files) { - return false - } - cf := r.files[r.cur] - - // Remember the offset after the last correctly read entry. If the next one - // is corrupted, this is where we can safely truncate. - r.lastOffset, r.err = cf.Seek(0, io.SeekCurrent) - if r.err != nil { - return false - } - - et, flag, b, err := r.entry(cf) - // If we reached the end of the reader, advance to the next one - // and close. - // Do not close on the last one as it will still be appended to. - if errors.Is(err, io.EOF) { - if r.cur == len(r.files)-1 { - return false - } - // Current reader completed, close and move to the next one. - if err := cf.Close(); err != nil { - r.err = err - return false - } - r.cur++ - return r.next() - } - if err != nil { - r.err = err - return false - } - - r.curType = et - r.curFlag = flag - r.curBuf = b - return r.err == nil -} - -func (r *walReader) current() *segmentFile { - return r.files[r.cur] -} - -// walCorruptionErr is a type wrapper for errors that indicate WAL corruption -// and trigger a truncation. -type walCorruptionErr struct { - err error - file int - lastOffset int64 -} - -func (e *walCorruptionErr) Error() string { - return fmt.Sprintf("%s ", e.err, e.file, e.lastOffset) -} - -func (e *walCorruptionErr) Unwrap() error { - return e.err -} - -func (r *walReader) corruptionErr(s string, args ...interface{}) error { - return &walCorruptionErr{ - err: fmt.Errorf(s, args...), - file: r.cur, - lastOffset: r.lastOffset, - } -} - -func (r *walReader) entry(cr io.Reader) (WALEntryType, byte, []byte, error) { - r.crc32.Reset() - tr := io.TeeReader(cr, r.crc32) - - b := make([]byte, 6) - switch n, err := tr.Read(b); { - case err != nil: - return 0, 0, nil, err - case n != 6: - return 0, 0, nil, r.corruptionErr("invalid entry header size %d", n) - } - - var ( - etype = WALEntryType(b[0]) - flag = b[1] - length = int(binary.BigEndian.Uint32(b[2:])) - ) - // Exit if we reached pre-allocated space. - if etype == 0 { - return 0, 0, nil, io.EOF - } - if etype != WALEntrySeries && etype != WALEntrySamples && etype != WALEntryDeletes { - return 0, 0, nil, r.corruptionErr("invalid entry type %d", etype) - } - - if length > len(r.buf) { - r.buf = make([]byte, length) - } - buf := r.buf[:length] - - switch n, err := tr.Read(buf); { - case err != nil: - return 0, 0, nil, err - case n != length: - return 0, 0, nil, r.corruptionErr("invalid entry body size %d", n) - } - - switch n, err := cr.Read(b[:4]); { - case err != nil: - return 0, 0, nil, err - case n != 4: - return 0, 0, nil, r.corruptionErr("invalid checksum length %d", n) - } - if exp, has := binary.BigEndian.Uint32(b[:4]), r.crc32.Sum32(); has != exp { - return 0, 0, nil, r.corruptionErr("unexpected CRC32 checksum %x, want %x", has, exp) - } - - return etype, flag, buf, nil -} - -func (r *walReader) decodeSeries(flag byte, b []byte, res *[]record.RefSeries) error { - dec := encoding.Decbuf{B: b} - - for len(dec.B) > 0 && dec.Err() == nil { - ref := chunks.HeadSeriesRef(dec.Be64()) - lset := r.dec.DecodeLabels(&dec) - - *res = append(*res, record.RefSeries{ - Ref: ref, - Labels: lset, - }) - } - if dec.Err() != nil { - return dec.Err() - } - if len(dec.B) > 0 { - return fmt.Errorf("unexpected %d bytes left in entry", len(dec.B)) - } - return nil -} - -func (r *walReader) decodeSamples(flag byte, b []byte, res *[]record.RefSample) error { - if len(b) == 0 { - return nil - } - dec := encoding.Decbuf{B: b} - - var ( - baseRef = dec.Be64() - baseTime = dec.Be64int64() - ) - - for len(dec.B) > 0 && dec.Err() == nil { - dref := dec.Varint64() - dtime := dec.Varint64() - val := dec.Be64() - - *res = append(*res, record.RefSample{ - Ref: chunks.HeadSeriesRef(int64(baseRef) + dref), - T: baseTime + dtime, - V: math.Float64frombits(val), - }) - } - - if err := dec.Err(); err != nil { - return fmt.Errorf("decode error after %d samples: %w", len(*res), err) - } - if len(dec.B) > 0 { - return fmt.Errorf("unexpected %d bytes left in entry", len(dec.B)) - } - return nil -} - -func (r *walReader) decodeDeletes(flag byte, b []byte, res *[]tombstones.Stone) error { - dec := &encoding.Decbuf{B: b} - - for dec.Len() > 0 && dec.Err() == nil { - *res = append(*res, tombstones.Stone{ - Ref: storage.SeriesRef(dec.Be64()), - Intervals: tombstones.Intervals{ - {Mint: dec.Varint64(), Maxt: dec.Varint64()}, - }, - }) - } - if dec.Err() != nil { - return dec.Err() - } - if len(dec.B) > 0 { - return fmt.Errorf("unexpected %d bytes left in entry", len(dec.B)) - } - return nil -} - -func deprecatedWALExists(logger log.Logger, dir string) (bool, error) { - // Detect whether we still have the old WAL. - fns, err := sequenceFiles(dir) - if err != nil && !os.IsNotExist(err) { - return false, fmt.Errorf("list sequence files: %w", err) - } - if len(fns) == 0 { - return false, nil // No WAL at all yet. - } - // Check header of first segment to see whether we are still dealing with an - // old WAL. - f, err := os.Open(fns[0]) - if err != nil { - return false, fmt.Errorf("check first existing segment: %w", err) - } - defer f.Close() - - var hdr [4]byte - if _, err := f.Read(hdr[:]); err != nil && !errors.Is(err, io.EOF) { - return false, fmt.Errorf("read header from first segment: %w", err) - } - // If we cannot read the magic header for segments of the old WAL, abort. - // Either it's migrated already or there's a corruption issue with which - // we cannot deal here anyway. Subsequent attempts to open the WAL will error in that case. - if binary.BigEndian.Uint32(hdr[:]) != WALMagic { - return false, nil - } - return true, nil -} - -// MigrateWAL rewrites the deprecated write ahead log into the new format. -func MigrateWAL(logger log.Logger, dir string) (err error) { - if logger == nil { - logger = log.NewNopLogger() - } - if exists, err := deprecatedWALExists(logger, dir); err != nil || !exists { - return err - } - level.Info(logger).Log("msg", "Migrating WAL format") - - tmpdir := dir + ".tmp" - if err := os.RemoveAll(tmpdir); err != nil { - return fmt.Errorf("cleanup replacement dir: %w", err) - } - repl, err := wlog.New(logger, nil, tmpdir, wlog.CompressionNone) - if err != nil { - return fmt.Errorf("open new WAL: %w", err) - } - - // It should've already been closed as part of the previous finalization. - // Do it once again in case of prior errors. - defer func() { - if err != nil { - repl.Close() - } - }() - - w, err := OpenSegmentWAL(dir, logger, time.Minute, nil) - if err != nil { - return fmt.Errorf("open old WAL: %w", err) - } - defer w.Close() - - rdr := w.Reader() - - var ( - enc record.Encoder - b []byte - ) - decErr := rdr.Read( - func(s []record.RefSeries) { - if err != nil { - return - } - err = repl.Log(enc.Series(s, b[:0])) - }, - func(s []record.RefSample) { - if err != nil { - return - } - err = repl.Log(enc.Samples(s, b[:0])) - }, - func(s []tombstones.Stone) { - if err != nil { - return - } - err = repl.Log(enc.Tombstones(s, b[:0])) - }, - ) - if decErr != nil { - return fmt.Errorf("decode old entries: %w", err) - } - if err != nil { - return fmt.Errorf("write new entries: %w", err) - } - // We explicitly close even when there is a defer for Windows to be - // able to delete it. The defer is in place to close it in-case there - // are errors above. - if err := w.Close(); err != nil { - return fmt.Errorf("close old WAL: %w", err) - } - if err := repl.Close(); err != nil { - return fmt.Errorf("close new WAL: %w", err) - } - if err := fileutil.Replace(tmpdir, dir); err != nil { - return fmt.Errorf("replace old WAL: %w", err) - } - return nil -} diff --git a/tsdb/wal_test.go b/tsdb/wal_test.go deleted file mode 100644 index 7794a5454..000000000 --- a/tsdb/wal_test.go +++ /dev/null @@ -1,553 +0,0 @@ -// Copyright 2017 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. - -//go:build !windows - -package tsdb - -import ( - "encoding/binary" - "io" - "math/rand" - "os" - "path" - "path/filepath" - "testing" - "time" - - "github.com/go-kit/log" - "github.com/stretchr/testify/require" - - "github.com/prometheus/prometheus/model/labels" - "github.com/prometheus/prometheus/storage" - "github.com/prometheus/prometheus/tsdb/chunks" - "github.com/prometheus/prometheus/tsdb/record" - "github.com/prometheus/prometheus/tsdb/tombstones" - "github.com/prometheus/prometheus/tsdb/wlog" - "github.com/prometheus/prometheus/util/testutil" -) - -func TestSegmentWAL_cut(t *testing.T) { - tmpdir := t.TempDir() - - // This calls cut() implicitly the first time without a previous tail. - w, err := OpenSegmentWAL(tmpdir, nil, 0, nil) - require.NoError(t, err) - - require.NoError(t, w.write(WALEntrySeries, 1, []byte("Hello World!!"))) - - require.NoError(t, w.cut()) - - // Cutting creates a new file. - require.Len(t, w.files, 2) - - require.NoError(t, w.write(WALEntrySeries, 1, []byte("Hello World!!"))) - - require.NoError(t, w.Close()) - - for _, of := range w.files { - f, err := os.Open(of.Name()) - require.NoError(t, err) - - // Verify header data. - metab := make([]byte, 8) - _, err = f.Read(metab) - require.NoError(t, err) - require.Equal(t, WALMagic, binary.BigEndian.Uint32(metab[:4])) - require.Equal(t, WALFormatDefault, metab[4]) - - // We cannot actually check for correct pre-allocation as it is - // optional per filesystem and handled transparently. - et, flag, b, err := newWALReader(nil, nil).entry(f) - require.NoError(t, err) - require.Equal(t, WALEntrySeries, et) - require.Equal(t, byte(walSeriesSimple), flag) - require.Equal(t, []byte("Hello World!!"), b) - } -} - -func TestSegmentWAL_Truncate(t *testing.T) { - const ( - numMetrics = 20000 - batch = 100 - ) - series, err := labels.ReadLabels(filepath.Join("testdata", "20kseries.json"), numMetrics) - require.NoError(t, err) - - dir := t.TempDir() - - w, err := OpenSegmentWAL(dir, nil, 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w) - w.segmentSize = 10000 - - for i := 0; i < numMetrics; i += batch { - var rs []record.RefSeries - - for j, s := range series[i : i+batch] { - rs = append(rs, record.RefSeries{Labels: s, Ref: chunks.HeadSeriesRef(i+j) + 1}) - } - err := w.LogSeries(rs) - require.NoError(t, err) - } - - // We mark the 2nd half of the files with a min timestamp that should discard - // them from the selection of compactable files. - for i, f := range w.files[len(w.files)/2:] { - f.maxTime = int64(1000 + i) - } - // All series in those files must be preserved regarding of the provided postings list. - boundarySeries := w.files[len(w.files)/2].minSeries - - // We truncate while keeping every 2nd series. - keep := map[chunks.HeadSeriesRef]struct{}{} - for i := 1; i <= numMetrics; i += 2 { - keep[chunks.HeadSeriesRef(i)] = struct{}{} - } - keepf := func(id chunks.HeadSeriesRef) bool { - _, ok := keep[id] - return ok - } - - err = w.Truncate(1000, keepf) - require.NoError(t, err) - - var expected []record.RefSeries - - for i := 1; i <= numMetrics; i++ { - if i%2 == 1 || chunks.HeadSeriesRef(i) >= boundarySeries { - expected = append(expected, record.RefSeries{Ref: chunks.HeadSeriesRef(i), Labels: series[i-1]}) - } - } - - // Call Truncate once again to see whether we can read the written file without - // creating a new WAL. - err = w.Truncate(1000, keepf) - require.NoError(t, err) - require.NoError(t, w.Close()) - - // The same again with a new WAL. - w, err = OpenSegmentWAL(dir, nil, 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w) - - var readSeries []record.RefSeries - r := w.Reader() - - require.NoError(t, r.Read(func(s []record.RefSeries) { - readSeries = append(readSeries, s...) - }, nil, nil)) - - testutil.RequireEqual(t, expected, readSeries) -} - -// Symmetrical test of reading and writing to the WAL via its main interface. -func TestSegmentWAL_Log_Restore(t *testing.T) { - const ( - numMetrics = 50 - iterations = 5 - stepSize = 5 - ) - // Generate testing data. It does not make semantic sense but - // for the purpose of this test. - series, err := labels.ReadLabels(filepath.Join("testdata", "20kseries.json"), numMetrics) - require.NoError(t, err) - - dir := t.TempDir() - - var ( - recordedSeries [][]record.RefSeries - recordedSamples [][]record.RefSample - recordedDeletes [][]tombstones.Stone - ) - var totalSamples int - - // Open WAL a bunch of times, validate all previous data can be read, - // write more data to it, close it. - for k := 0; k < numMetrics; k += numMetrics / iterations { - w, err := OpenSegmentWAL(dir, nil, 0, nil) - require.NoError(t, err) - - // Set smaller segment size so we can actually write several files. - w.segmentSize = 1000 * 1000 - - r := w.Reader() - - var ( - resultSeries [][]record.RefSeries - resultSamples [][]record.RefSample - resultDeletes [][]tombstones.Stone - ) - - serf := func(series []record.RefSeries) { - if len(series) > 0 { - clsets := make([]record.RefSeries, len(series)) - copy(clsets, series) - resultSeries = append(resultSeries, clsets) - } - } - smplf := func(smpls []record.RefSample) { - if len(smpls) > 0 { - csmpls := make([]record.RefSample, len(smpls)) - copy(csmpls, smpls) - resultSamples = append(resultSamples, csmpls) - } - } - - delf := func(stones []tombstones.Stone) { - if len(stones) > 0 { - cst := make([]tombstones.Stone, len(stones)) - copy(cst, stones) - resultDeletes = append(resultDeletes, cst) - } - } - - require.NoError(t, r.Read(serf, smplf, delf)) - - testutil.RequireEqual(t, recordedSamples, resultSamples) - testutil.RequireEqual(t, recordedSeries, resultSeries) - testutil.RequireEqual(t, recordedDeletes, resultDeletes) - - series := series[k : k+(numMetrics/iterations)] - - // Insert in batches and generate different amounts of samples for each. - for i := 0; i < len(series); i += stepSize { - var samples []record.RefSample - var stones []tombstones.Stone - - for j := 0; j < i*10; j++ { - samples = append(samples, record.RefSample{ - Ref: chunks.HeadSeriesRef(j % 10000), - T: int64(j * 2), - V: rand.Float64(), - }) - } - - for j := 0; j < i*20; j++ { - ts := rand.Int63() - stones = append(stones, tombstones.Stone{Ref: storage.SeriesRef(rand.Uint64()), Intervals: tombstones.Intervals{{Mint: ts, Maxt: ts + rand.Int63n(10000)}}}) - } - - lbls := series[i : i+stepSize] - series := make([]record.RefSeries, 0, len(series)) - for j, l := range lbls { - series = append(series, record.RefSeries{ - Ref: chunks.HeadSeriesRef(i + j), - Labels: l, - }) - } - - require.NoError(t, w.LogSeries(series)) - require.NoError(t, w.LogSamples(samples)) - require.NoError(t, w.LogDeletes(stones)) - - if len(lbls) > 0 { - recordedSeries = append(recordedSeries, series) - } - if len(samples) > 0 { - recordedSamples = append(recordedSamples, samples) - totalSamples += len(samples) - } - if len(stones) > 0 { - recordedDeletes = append(recordedDeletes, stones) - } - } - - require.NoError(t, w.Close()) - } -} - -func TestWALRestoreCorrupted_invalidSegment(t *testing.T) { - dir := t.TempDir() - - wal, err := OpenSegmentWAL(dir, nil, 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(wal) - - _, err = wal.createSegmentFile(filepath.Join(dir, "000000")) - require.NoError(t, err) - f, err := wal.createSegmentFile(filepath.Join(dir, "000001")) - require.NoError(t, err) - f2, err := wal.createSegmentFile(filepath.Join(dir, "000002")) - require.NoError(t, err) - require.NoError(t, f2.Close()) - - // Make header of second segment invalid. - _, err = f.WriteAt([]byte{1, 2, 3, 4}, 0) - require.NoError(t, err) - require.NoError(t, f.Close()) - - require.NoError(t, wal.Close()) - - wal, err = OpenSegmentWAL(dir, log.NewLogfmtLogger(os.Stderr), 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(wal) - - files, err := os.ReadDir(dir) - require.NoError(t, err) - fns := []string{} - for _, f := range files { - fns = append(fns, f.Name()) - } - require.Equal(t, []string{"000000"}, fns) -} - -// Test reading from a WAL that has been corrupted through various means. -func TestWALRestoreCorrupted(t *testing.T) { - cases := []struct { - name string - f func(*testing.T, *SegmentWAL) - }{ - { - name: "truncate_checksum", - f: func(t *testing.T, w *SegmentWAL) { - f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666) - require.NoError(t, err) - defer f.Close() - - off, err := f.Seek(0, io.SeekEnd) - require.NoError(t, err) - - require.NoError(t, f.Truncate(off-1)) - }, - }, - { - name: "truncate_body", - f: func(t *testing.T, w *SegmentWAL) { - f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666) - require.NoError(t, err) - defer f.Close() - - off, err := f.Seek(0, io.SeekEnd) - require.NoError(t, err) - - require.NoError(t, f.Truncate(off-8)) - }, - }, - { - name: "body_content", - f: func(t *testing.T, w *SegmentWAL) { - f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666) - require.NoError(t, err) - defer f.Close() - - off, err := f.Seek(0, io.SeekEnd) - require.NoError(t, err) - - // Write junk before checksum starts. - _, err = f.WriteAt([]byte{1, 2, 3, 4}, off-8) - require.NoError(t, err) - }, - }, - { - name: "checksum", - f: func(t *testing.T, w *SegmentWAL) { - f, err := os.OpenFile(w.files[0].Name(), os.O_WRONLY, 0o666) - require.NoError(t, err) - defer f.Close() - - off, err := f.Seek(0, io.SeekEnd) - require.NoError(t, err) - - // Write junk into checksum - _, err = f.WriteAt([]byte{1, 2, 3, 4}, off-4) - require.NoError(t, err) - }, - }, - } - for _, c := range cases { - t.Run(c.name, func(t *testing.T) { - // Generate testing data. It does not make semantic sense but - // for the purpose of this test. - dir := t.TempDir() - - w, err := OpenSegmentWAL(dir, nil, 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w) - - require.NoError(t, w.LogSamples([]record.RefSample{{T: 1, V: 2}})) - require.NoError(t, w.LogSamples([]record.RefSample{{T: 2, V: 3}})) - - require.NoError(t, w.cut()) - - // Sleep 2 seconds to avoid error where cut and test "cases" function may write or - // truncate the file out of orders as "cases" are not synchronized with cut. - // Hopefully cut will complete by 2 seconds. - time.Sleep(2 * time.Second) - - require.NoError(t, w.LogSamples([]record.RefSample{{T: 3, V: 4}})) - require.NoError(t, w.LogSamples([]record.RefSample{{T: 5, V: 6}})) - - require.NoError(t, w.Close()) - - // cut() truncates and fsyncs the first segment async. If it happens after - // the corruption we apply below, the corruption will be overwritten again. - // Fire and forget a sync to avoid flakiness. - w.files[0].Sync() - // Corrupt the second entry in the first file. - // After re-opening we must be able to read the first entry - // and the rest, including the second file, must be truncated for clean further - // writes. - c.f(t, w) - - logger := log.NewLogfmtLogger(os.Stderr) - - w2, err := OpenSegmentWAL(dir, logger, 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w2) - - r := w2.Reader() - - serf := func(l []record.RefSeries) { - require.Empty(t, l) - } - - // Weird hack to check order of reads. - i := 0 - samplef := func(s []record.RefSample) { - if i == 0 { - require.Equal(t, []record.RefSample{{T: 1, V: 2}}, s) - i++ - } else { - require.Equal(t, []record.RefSample{{T: 99, V: 100}}, s) - } - } - - require.NoError(t, r.Read(serf, samplef, nil)) - - require.NoError(t, w2.LogSamples([]record.RefSample{{T: 99, V: 100}})) - require.NoError(t, w2.Close()) - - // We should see the first valid entry and the new one, everything after - // is truncated. - w3, err := OpenSegmentWAL(dir, logger, 0, nil) - require.NoError(t, err) - defer func(wal *SegmentWAL) { require.NoError(t, wal.Close()) }(w3) - - r = w3.Reader() - - i = 0 - require.NoError(t, r.Read(serf, samplef, nil)) - }) - } -} - -func TestMigrateWAL_Empty(t *testing.T) { - // The migration procedure must properly deal with a zero-length segment, - // which is valid in the new format. - dir := t.TempDir() - - wdir := path.Join(dir, "wal") - - // Initialize empty WAL. - w, err := wlog.New(nil, nil, wdir, wlog.CompressionNone) - require.NoError(t, err) - require.NoError(t, w.Close()) - - require.NoError(t, MigrateWAL(nil, wdir)) -} - -func TestMigrateWAL_Fuzz(t *testing.T) { - dir := t.TempDir() - - wdir := path.Join(dir, "wal") - - // Should pass if no WAL exists yet. - require.NoError(t, MigrateWAL(nil, wdir)) - - oldWAL, err := OpenSegmentWAL(wdir, nil, time.Minute, nil) - require.NoError(t, err) - - // Write some data. - require.NoError(t, oldWAL.LogSeries([]record.RefSeries{ - {Ref: 100, Labels: labels.FromStrings("abc", "def", "123", "456")}, - {Ref: 1, Labels: labels.FromStrings("abc", "def2", "1234", "4567")}, - })) - require.NoError(t, oldWAL.LogSamples([]record.RefSample{ - {Ref: 1, T: 100, V: 200}, - {Ref: 2, T: 300, V: 400}, - })) - require.NoError(t, oldWAL.LogSeries([]record.RefSeries{ - {Ref: 200, Labels: labels.FromStrings("xyz", "def", "foo", "bar")}, - })) - require.NoError(t, oldWAL.LogSamples([]record.RefSample{ - {Ref: 3, T: 100, V: 200}, - {Ref: 4, T: 300, V: 400}, - })) - require.NoError(t, oldWAL.LogDeletes([]tombstones.Stone{ - {Ref: 1, Intervals: []tombstones.Interval{{Mint: 100, Maxt: 200}}}, - })) - - require.NoError(t, oldWAL.Close()) - - // Perform migration. - require.NoError(t, MigrateWAL(nil, wdir)) - - 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{} - dec := record.NewDecoder(labels.NewSymbolTable()) - - 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: - require.Fail(t, "unknown record type %d", dec.Type(rec)) - } - } - require.NoError(t, r.Err()) - - testutil.RequireEqual(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)) -}