Merge pull request #3352 from prometheus/rc2

Cut v2.0.0-rc.2

CHANGELOG.md

-## 2.0.0-rc.1 / 2017-10-17
-
-* [FEATURE] Added a warning for time-drift between the browser and the prometheus-server.
-* [ENHANCEMENT] Much faster WAL read-back on restart.
-* [BUGFIX] Fixed Remote-read to not drop the first series.
-* [BUGFIX] Validate recording-rule names.
-* [BUGFIX] Fix several races.
-* [BUGFIX] Only close blocks if there are no iterators accessing it.
+## 2.0.0-rc.2 / 2017-10-25
+
+* [ENHANCEMENT] handle WAL segments with corrupted header gracefully
+* [ENHANCEMENT] stabilize memory usage during WAL replay
+* [CHANGE] Prefix all storage metrics with `prometheus_`
+* [BUGFIX] Correctly handle label removal in remote read
+* [BUGFIX] Fix chunk misalignment causing out-of-order samples
+* [BUGFIX] Fix connection leak in Consul SD
+* [BUGFIX] Handle invalid chunk derefernces gracefully
+* [BUGFIX] Prevent potential deadlock during failing querier construction
+
+Data written in previous pre-release versions may have been affected by the out-of-order
+bug. Reading this data may reveal artefacts and incorrect data.
+Starting with a clean storage directory is advised. The WAL directory may safely be kept.
+
 
 ## 1.8.0 / 2017-10-06
 

VERSION

-2.0.0-rc.1
+2.0.0-rc.2

storage/tsdb/tsdb.go

@@ -167,6 +167,7 @@ func (a adapter) StartTime() (int64, error) {
 			return startTime, err
 		}
 	}
+	defer indexr.Close()
 
 	joblabel := "job"
 	tpls, err := indexr.LabelValues(joblabel)

vendor/github.com/prometheus/tsdb/chunks/chunk.go

@@ -69,6 +69,17 @@ type Iterator interface {
 	Next() bool
 }
 
+// NewNopIterator returns a new chunk iterator that does not hold any data.
+func NewNopIterator() Iterator {
+	return nopIterator{}
+}
+
+type nopIterator struct{}
+
+func (nopIterator) At() (int64, float64) { return 0, 0 }
+func (nopIterator) Next() bool           { return false }
+func (nopIterator) Err() error           { return nil }
+
 type Pool interface {
 	Put(Chunk) error
 	Get(e Encoding, b []byte) (Chunk, error)

vendor/github.com/prometheus/tsdb/compact.go

@@ -81,30 +81,30 @@ func newCompactorMetrics(r prometheus.Registerer) *compactorMetrics {
 	m := &compactorMetrics{}
 
 	m.ran = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_compactions_total",
+		Name: "prometheus_tsdb_compactions_total",
 		Help: "Total number of compactions that were executed for the partition.",
 	})
 	m.failed = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_compactions_failed_total",
+		Name: "prometheus_tsdb_compactions_failed_total",
 		Help: "Total number of compactions that failed for the partition.",
 	})
 	m.duration = prometheus.NewHistogram(prometheus.HistogramOpts{
-		Name:    "tsdb_compaction_duration",
+		Name:    "prometheus_tsdb_compaction_duration",
 		Help:    "Duration of compaction runs.",
 		Buckets: prometheus.ExponentialBuckets(1, 2, 10),
 	})
 	m.chunkSize = prometheus.NewHistogram(prometheus.HistogramOpts{
-		Name:    "tsdb_compaction_chunk_size",
+		Name:    "prometheus_tsdb_compaction_chunk_size",
 		Help:    "Final size of chunks on their first compaction",
 		Buckets: prometheus.ExponentialBuckets(32, 1.5, 12),
 	})
 	m.chunkSamples = prometheus.NewHistogram(prometheus.HistogramOpts{
-		Name:    "tsdb_compaction_chunk_samples",
+		Name:    "prometheus_tsdb_compaction_chunk_samples",
 		Help:    "Final number of samples on their first compaction",
 		Buckets: prometheus.ExponentialBuckets(4, 1.5, 12),
 	})
 	m.chunkRange = prometheus.NewHistogram(prometheus.HistogramOpts{
-		Name:    "tsdb_compaction_chunk_range",
+		Name:    "prometheus_tsdb_compaction_chunk_range",
 		Help:    "Final time range of chunks on their first compaction",
 		Buckets: prometheus.ExponentialBuckets(100, 4, 10),
 	})

vendor/github.com/prometheus/tsdb/db.go

@@ -129,7 +129,7 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
 	m := &dbMetrics{}
 
 	m.loadedBlocks = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
-		Name: "tsdb_blocks_loaded",
+		Name: "prometheus_tsdb_blocks_loaded",
 		Help: "Number of currently loaded data blocks",
 	}, func() float64 {
 		db.mtx.RLock()
@@ -137,15 +137,15 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
 		return float64(len(db.blocks))
 	})
 	m.reloads = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_reloads_total",
+		Name: "prometheus_tsdb_reloads_total",
 		Help: "Number of times the database reloaded block data from disk.",
 	})
 	m.reloadsFailed = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_reloads_failures_total",
+		Name: "prometheus_tsdb_reloads_failures_total",
 		Help: "Number of times the database failed to reload black data from disk.",
 	})
 	m.compactionsTriggered = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_compactions_triggered_total",
+		Name: "prometheus_tsdb_compactions_triggered_total",
 		Help: "Total number of triggered compactions for the partition.",
 	})
 
@@ -448,9 +448,6 @@ func (db *DB) reload() (err error) {
 		db.metrics.reloads.Inc()
 	}()
 
-	var cs []io.Closer
-	defer func() { closeAll(cs...) }()
-
 	dirs, err := blockDirs(db.dir)
 	if err != nil {
 		return errors.Wrap(err, "find blocks")
@@ -482,25 +479,25 @@ func (db *DB) reload() (err error) {
 		return errors.Wrap(err, "invalid block sequence")
 	}
 
-	// Close all opened blocks that no longer exist after we returned all locks.
-	// TODO(fabxc: probably races with querier still reading from them. Can
-	// we just abandon them and have the open FDs be GC'd automatically eventually?
-	for _, b := range db.blocks {
-		if _, ok := exist[b.Meta().ULID]; !ok {
-			cs = append(cs, b)
-		}
-	}
-
+	// Swap in new blocks first for subsequently created readers to be seen.
+	// Then close previous blocks, which may block for pending readers to complete.
 	db.mtx.Lock()
+	oldBlocks := db.blocks
 	db.blocks = blocks
 	db.mtx.Unlock()
 
+	for _, b := range oldBlocks {
+		if _, ok := exist[b.Meta().ULID]; !ok {
+			b.Close()
+		}
+	}
+
 	// Garbage collect data in the head if the most recent persisted block
 	// covers data of its current time range.
 	if len(blocks) == 0 {
 		return nil
 	}
-	maxt := blocks[len(db.blocks)-1].Meta().MaxTime
+	maxt := blocks[len(blocks)-1].Meta().MaxTime
 
 	return errors.Wrap(db.head.Truncate(maxt), "head truncate failed")
 }
@@ -593,7 +590,10 @@ func (db *DB) Snapshot(dir string) error {
 	db.cmtx.Lock()
 	defer db.cmtx.Unlock()
 
-	for _, b := range db.Blocks() {
+	db.mtx.RLock()
+	defer db.mtx.RUnlock()
+
+	for _, b := range db.blocks {
 		level.Info(db.logger).Log("msg", "snapshotting block", "block", b)
 
 		if err := b.Snapshot(dir); err != nil {
@@ -608,7 +608,10 @@ func (db *DB) Snapshot(dir string) error {
 func (db *DB) Querier(mint, maxt int64) (Querier, error) {
 	var blocks []BlockReader
 
-	for _, b := range db.Blocks() {
+	db.mtx.RLock()
+	defer db.mtx.RUnlock()
+
+	for _, b := range db.blocks {
 		m := b.Meta()
 		if intervalOverlap(mint, maxt, m.MinTime, m.MaxTime) {
 			blocks = append(blocks, b)
@@ -623,10 +626,15 @@ func (db *DB) Querier(mint, maxt int64) (Querier, error) {
 	}
 	for _, b := range blocks {
 		q, err := NewBlockQuerier(b, mint, maxt)
-		if err != nil {
-			return nil, errors.Wrapf(err, "open querier for block %s", b)
+		if err == nil {
+			sq.blocks = append(sq.blocks, q)
+			continue
+		}
+		// If we fail, all previously opened queriers must be closed.
+		for _, q := range sq.blocks {
+			q.Close()
 		}
-		sq.blocks = append(sq.blocks, q)
+		return nil, errors.Wrapf(err, "open querier for block %s", b)
 	}
 	return sq, nil
 }
@@ -643,7 +651,10 @@ func (db *DB) Delete(mint, maxt int64, ms ...labels.Matcher) error {
 
 	var g errgroup.Group
 
-	for _, b := range db.Blocks() {
+	db.mtx.RLock()
+	defer db.mtx.RUnlock()
+
+	for _, b := range db.blocks {
 		m := b.Meta()
 		if intervalOverlap(mint, maxt, m.MinTime, m.MaxTime) {
 			g.Go(func(b *Block) func() error {

vendor/github.com/prometheus/tsdb/head.go

@@ -89,59 +89,59 @@ func newHeadMetrics(h *Head, r prometheus.Registerer) *headMetrics {
 	m := &headMetrics{}
 
 	m.activeAppenders = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_active_appenders",
+		Name: "prometheus_tsdb_head_active_appenders",
 		Help: "Number of currently active appender transactions",
 	})
 	m.series = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_series",
+		Name: "prometheus_tsdb_head_series",
 		Help: "Total number of series in the head block.",
 	})
 	m.seriesCreated = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_series_created_total",
+		Name: "prometheus_tsdb_head_series_created_total",
 		Help: "Total number of series created in the head",
 	})
 	m.seriesRemoved = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_series_removed_total",
+		Name: "prometheus_tsdb_head_series_removed_total",
 		Help: "Total number of series removed in the head",
 	})
 	m.seriesNotFound = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_head_series_not_found",
+		Name: "prometheus_tsdb_head_series_not_found",
 		Help: "Total number of requests for series that were not found.",
 	})
 	m.chunks = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_chunks",
+		Name: "prometheus_tsdb_head_chunks",
 		Help: "Total number of chunks in the head block.",
 	})
 	m.chunksCreated = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_chunks_created_total",
+		Name: "prometheus_tsdb_head_chunks_created_total",
 		Help: "Total number of chunks created in the head",
 	})
 	m.chunksRemoved = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "tsdb_head_chunks_removed_total",
+		Name: "prometheus_tsdb_head_chunks_removed_total",
 		Help: "Total number of chunks removed in the head",
 	})
 	m.gcDuration = prometheus.NewSummary(prometheus.SummaryOpts{
-		Name: "tsdb_head_gc_duration_seconds",
+		Name: "prometheus_tsdb_head_gc_duration_seconds",
 		Help: "Runtime of garbage collection in the head block.",
 	})
 	m.maxTime = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
-		Name: "tsdb_head_max_time",
+		Name: "prometheus_tsdb_head_max_time",
 		Help: "Maximum timestamp of the head block.",
 	}, func() float64 {
 		return float64(h.MaxTime())
 	})
 	m.minTime = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
-		Name: "tsdb_head_min_time",
+		Name: "prometheus_tsdb_head_min_time",
 		Help: "Minimum time bound of the head block.",
 	}, func() float64 {
 		return float64(h.MinTime())
 	})
 	m.walTruncateDuration = prometheus.NewSummary(prometheus.SummaryOpts{
-		Name: "tsdb_wal_truncate_duration_seconds",
+		Name: "prometheus_tsdb_wal_truncate_duration_seconds",
 		Help: "Duration of WAL truncation.",
 	})
 	m.samplesAppended = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "tsdb_head_samples_appended_total",
+		Name: "prometheus_tsdb_head_samples_appended_total",
 		Help: "Total number of appended sampledb.",
 	})
 
@@ -273,13 +273,23 @@ func (h *Head) ReadWAL() error {
 		}
 	}
 	samplesFunc := func(samples []RefSample) {
-		var buf []RefSample
-		select {
-		case buf = <-input:
-		default:
-			buf = make([]RefSample, 0, len(samples)*11/10)
+		// We split up the samples into chunks of 5000 samples or less.
+		// With O(300 * #cores) in-flight sample batches, large scrapes could otherwise
+		// cause thousands of very large in flight buffers occupying large amounts
+		// of unused memory.
+		for len(samples) > 0 {
+			n := 5000
+			if len(samples) < n {
+				n = len(samples)
+			}
+			var buf []RefSample
+			select {
+			case buf = <-input:
+			default:
+			}
+			firstInput <- append(buf[:0], samples[:n]...)
+			samples = samples[n:]
 		}
-		firstInput <- append(buf[:0], samples...)
 	}
 	deletesFunc := func(stones []Stone) {
 		for _, s := range stones {
@@ -665,7 +675,7 @@ func (h *Head) gc() {
 	// Rebuild symbols and label value indices from what is left in the postings terms.
 	h.postings.mtx.RLock()
 
-	symbols := make(map[string]struct{}, len(h.symbols))
+	symbols := make(map[string]struct{})
 	values := make(map[string]stringset, len(h.values))
 
 	for t := range h.postings.m {
@@ -1152,6 +1162,10 @@ func (s *memSeries) cut(mint int64) *memChunk {
 	}
 	s.chunks = append(s.chunks, c)
 
+	// Set upper bound on when the next chunk must be started. An earlier timestamp
+	// may be chosen dynamically at a later point.
+	_, s.nextAt = rangeForTimestamp(mint, s.chunkRange)
+
 	app, err := c.chunk.Appender()
 	if err != nil {
 		panic(err)
@@ -1231,10 +1245,17 @@ func (s *memSeries) append(t int64, v float64) (success, chunkCreated bool) {
 	}
 	numSamples := c.chunk.NumSamples()
 
+	// Out of order sample.
 	if c.maxTime >= t {
 		return false, chunkCreated
 	}
-	if numSamples > samplesPerChunk/4 && t >= s.nextAt {
+	// If we reach 25% of a chunk's desired sample count, set a definitive time
+	// at which to start the next chunk.
+	// At latest it must happen at the timestamp set when the chunk was cut.
+	if numSamples == samplesPerChunk/4 {
+		s.nextAt = computeChunkEndTime(c.minTime, c.maxTime, s.nextAt)
+	}
+	if t >= s.nextAt {
 		c = s.cut(t)
 		chunkCreated = true
 	}
@@ -1242,11 +1263,6 @@ func (s *memSeries) append(t int64, v float64) (success, chunkCreated bool) {
 
 	c.maxTime = t
 
-	if numSamples == samplesPerChunk/4 {
-		_, maxt := rangeForTimestamp(c.minTime, s.chunkRange)
-		s.nextAt = computeChunkEndTime(c.minTime, c.maxTime, maxt)
-	}
-
 	s.lastValue = v
 
 	s.sampleBuf[0] = s.sampleBuf[1]
@@ -1270,6 +1286,12 @@ func computeChunkEndTime(start, cur, max int64) int64 {
 
 func (s *memSeries) iterator(id int) chunks.Iterator {
 	c := s.chunk(id)
+	// TODO(fabxc): Work around! A querier may have retrieved a pointer to a series' chunk,
+	// which got then garbage collected before it got accessed.
+	// We must ensure to not garbage collect as long as any readers still hold a reference.
+	if c == nil {
+		return chunks.NewNopIterator()
+	}
 
 	if id-s.firstChunkID < len(s.chunks)-1 {
 		return c.chunk.Iterator()

vendor/github.com/prometheus/tsdb/querier.go

@@ -114,10 +114,13 @@ func NewBlockQuerier(b BlockReader, mint, maxt int64) (Querier, error) {
 	}
 	chunkr, err := b.Chunks()
 	if err != nil {
+		indexr.Close()
 		return nil, errors.Wrapf(err, "open chunk reader")
 	}
 	tombsr, err := b.Tombstones()
 	if err != nil {
+		indexr.Close()
+		chunkr.Close()
 		return nil, errors.Wrapf(err, "open tombstone reader")
 	}
 	return &blockQuerier{
@@ -532,7 +535,6 @@ func (s *populatedChunkSeries) Next() bool {
 				return false
 			}
 		}
-
 		if len(chks) == 0 {
 			continue
 		}

vendor/github.com/prometheus/tsdb/tabwriter.go

-package tsdb
-
-import (
-	"io"
-	"text/tabwriter"
-)
-
-const (
-	minwidth = 0
-	tabwidth = 0
-	padding  = 2
-	padchar  = ' '
-	flags    = 0
-)
-
-func GetNewTabWriter(output io.Writer) *tabwriter.Writer {
-	return tabwriter.NewWriter(output, minwidth, tabwidth, padding, padchar, flags)
-}

vendor/github.com/prometheus/tsdb/wal.go

@@ -222,12 +222,21 @@ func OpenSegmentWAL(dir string, logger log.Logger, flushInterval time.Duration,
 	if err != nil {
 		return nil, err
 	}
-	for _, fn := range fns {
+
+	for i, fn := range fns {
 		f, err := w.openSegmentFile(fn)
-		if err != nil {
-			return nil, err
+		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, errors.Wrap(err, "removing segment failed")
+			}
 		}
-		w.files = append(w.files, newSegmentFile(f))
+		break
 	}
 
 	go w.run(flushInterval)

vendor/vendor.json

@@ -843,28 +843,28 @@
 			"revisionTime": "2016-04-11T19:08:41Z"
 		},
 		{
-			"checksumSHA1": "h3i8+wLSIqLvWBWjNPcARM0IQik=",
+			"checksumSHA1": "qbhdcw451oyIWXj+0zlkR+rDi9Y=",
 			"path": "github.com/prometheus/tsdb",
-			"revision": "7f8fa07cf7ee8ebde7bdb9ed084f7931c7c0e579",
-			"revisionTime": "2017-10-12T13:27:08Z"
+			"revision": "5d28c849c7ff3b43e2829a44a9aac16468e076ce",
+			"revisionTime": "2017-10-25T14:52:11Z"
 		},
 		{
-			"checksumSHA1": "Gua979gmISm4cJP/fR2hL8m5To8=",
+			"checksumSHA1": "uy6ySJ6EZqof+yMD2wTkYob8BeU=",
 			"path": "github.com/prometheus/tsdb/chunks",
-			"revision": "7f8fa07cf7ee8ebde7bdb9ed084f7931c7c0e579",
-			"revisionTime": "2017-10-12T13:27:08Z"
+			"revision": "5d28c849c7ff3b43e2829a44a9aac16468e076ce",
+			"revisionTime": "2017-10-25T14:52:11Z"
 		},
 		{
 			"checksumSHA1": "7RhNAVcmDmLFqn9nWiudT0B76f8=",
 			"path": "github.com/prometheus/tsdb/fileutil",
-			"revision": "7f8fa07cf7ee8ebde7bdb9ed084f7931c7c0e579",
-			"revisionTime": "2017-10-12T13:27:08Z"
+			"revision": "5d28c849c7ff3b43e2829a44a9aac16468e076ce",
+			"revisionTime": "2017-10-25T14:52:11Z"
 		},
 		{
 			"checksumSHA1": "zhmlvc322RH1L3l9DaA9d/HVVWs=",
 			"path": "github.com/prometheus/tsdb/labels",
-			"revision": "7f8fa07cf7ee8ebde7bdb9ed084f7931c7c0e579",
-			"revisionTime": "2017-10-12T13:27:08Z"
+			"revision": "5d28c849c7ff3b43e2829a44a9aac16468e076ce",
+			"revisionTime": "2017-10-25T14:52:11Z"
 		},
 		{
 			"checksumSHA1": "5SYLEhADhdBVZAGPVHWggQl7H8k=",