diff --git a/vendor/github.com/prometheus/tsdb/block.go b/vendor/github.com/prometheus/tsdb/block.go
index 67cd57491..232e64e67 100644
--- a/vendor/github.com/prometheus/tsdb/block.go
+++ b/vendor/github.com/prometheus/tsdb/block.go
@@ -64,11 +64,6 @@ type Appendable interface {
 	Appender() Appender
 }
 
-// Queryable defines an entity which provides a Querier.
-type Queryable interface {
-	Querier(mint, maxt int64) Querier
-}
-
 // BlockMeta provides meta information about a block.
 type BlockMeta struct {
 	// Unique identifier for the block and its contents. Changes on compaction.
diff --git a/vendor/github.com/prometheus/tsdb/db.go b/vendor/github.com/prometheus/tsdb/db.go
index c9745cfc6..87b5ed253 100644
--- a/vendor/github.com/prometheus/tsdb/db.go
+++ b/vendor/github.com/prometheus/tsdb/db.go
@@ -165,8 +165,7 @@ func Open(dir string, l log.Logger, r prometheus.Registerer, opts *Options) (db
 		return nil, err
 	}
 	if l == nil {
-		l = log.NewLogfmtLogger(os.Stdout)
-		l = log.With(l, "ts", log.DefaultTimestampUTC, "caller", log.DefaultCaller)
+		l = log.NewNopLogger()
 	}
 	if opts == nil {
 		opts = DefaultOptions
diff --git a/vendor/github.com/prometheus/tsdb/head.go b/vendor/github.com/prometheus/tsdb/head.go
index ea7b63f8a..a5ce94e45 100644
--- a/vendor/github.com/prometheus/tsdb/head.go
+++ b/vendor/github.com/prometheus/tsdb/head.go
@@ -185,13 +185,18 @@ func NewHead(r prometheus.Registerer, l log.Logger, wal WAL, chunkRange int64) (
 	return h, nil
 }
 
+// ReadWAL initializes the head by consuming the write ahead log.
 func (h *Head) ReadWAL() error {
 	r := h.wal.Reader()
 	mint := h.MinTime()
 
 	seriesFunc := func(series []RefSeries) error {
 		for _, s := range series {
-			h.create(s.Labels.Hash(), s.Labels)
+			h.getOrCreateWithID(s.Ref, s.Labels.Hash(), s.Labels)
+
+			if h.lastSeriesID < s.Ref {
+				h.lastSeriesID = s.Ref
+			}
 		}
 		return nil
 	}
@@ -202,7 +207,8 @@ func (h *Head) ReadWAL() error {
 			}
 			ms := h.series.getByID(s.Ref)
 			if ms == nil {
-				return errors.Errorf("unknown series reference %d; abort WAL restore", s.Ref)
+				h.logger.Log("msg", "unknown series reference in WAL", "ref", s.Ref)
+				continue
 			}
 			_, chunkCreated := ms.append(s.T, s.V)
 			if chunkCreated {
@@ -210,7 +216,6 @@ func (h *Head) ReadWAL() error {
 				h.metrics.chunks.Inc()
 			}
 		}
-
 		return nil
 	}
 	deletesFunc := func(stones []Stone) error {
@@ -222,7 +227,6 @@ func (h *Head) ReadWAL() error {
 				h.tombstones.add(s.ref, itv)
 			}
 		}
-
 		return nil
 	}
 
@@ -379,17 +383,12 @@ func (a *headAppender) Add(lset labels.Labels, t int64, v float64) (uint64, erro
 	if t < a.mint {
 		return 0, ErrOutOfBounds
 	}
-	hash := lset.Hash()
-
-	s := a.head.series.getByHash(hash, lset)
-
-	if s == nil {
-		s = a.head.create(hash, lset)
 
+	s, created := a.head.getOrCreate(lset.Hash(), lset)
+	if created {
 		a.series = append(a.series, RefSeries{
 			Ref:    s.ref,
 			Labels: lset,
-			hash:   hash,
 		})
 	}
 	return s.ref, a.AddFast(s.ref, t, v)
@@ -839,20 +838,32 @@ func (h *headIndexReader) LabelIndices() ([][]string, error) {
 	return res, nil
 }
 
-func (h *Head) create(hash uint64, lset labels.Labels) *memSeries {
-	h.metrics.series.Inc()
-	h.metrics.seriesCreated.Inc()
+func (h *Head) getOrCreate(hash uint64, lset labels.Labels) (*memSeries, bool) {
+	// Just using `getOrSet` below would be semantically sufficient, but we'd create
+	// a new series on every sample inserted via Add(), which causes allocations
+	// and makes our series IDs rather random and harder to compress in postings.
+	s := h.series.getByHash(hash, lset)
+	if s != nil {
+		return s, false
+	}
 
 	// Optimistically assume that we are the first one to create the series.
 	id := atomic.AddUint64(&h.lastSeriesID, 1)
+
+	return h.getOrCreateWithID(id, hash, lset)
+}
+
+func (h *Head) getOrCreateWithID(id, hash uint64, lset labels.Labels) (*memSeries, bool) {
 	s := newMemSeries(lset, id, h.chunkRange)
 
 	s, created := h.series.getOrSet(hash, s)
-	// Skip indexing if we didn't actually create the series.
 	if !created {
-		return s
+		return s, false
 	}
 
+	h.metrics.series.Inc()
+	h.metrics.seriesCreated.Inc()
+
 	h.postings.add(id, lset)
 
 	h.symMtx.Lock()
@@ -870,7 +881,7 @@ func (h *Head) create(hash uint64, lset labels.Labels) *memSeries {
 		h.symbols[l.Value] = struct{}{}
 	}
 
-	return s
+	return s, true
 }
 
 // seriesHashmap is a simple hashmap for memSeries by their label set. It is built
@@ -1023,6 +1034,7 @@ func (s *stripeSeries) getOrSet(hash uint64, series *memSeries) (*memSeries, boo
 	s.locks[i].Lock()
 
 	if prev := s.hashes[i].get(hash, series.lset); prev != nil {
+		s.locks[i].Unlock()
 		return prev, false
 	}
 	s.hashes[i].set(hash, series)
diff --git a/vendor/github.com/prometheus/tsdb/index.go b/vendor/github.com/prometheus/tsdb/index.go
index fd9b25162..3cdaad74d 100644
--- a/vendor/github.com/prometheus/tsdb/index.go
+++ b/vendor/github.com/prometheus/tsdb/index.go
@@ -570,6 +570,9 @@ var (
 	errInvalidFlag = fmt.Errorf("invalid flag")
 )
 
+// NewIndexReader returns a new IndexReader on the given directory.
+func NewIndexReader(dir string) (IndexReader, error) { return newIndexReader(dir) }
+
 // newIndexReader returns a new indexReader on the given directory.
 func newIndexReader(dir string) (*indexReader, error) {
 	f, err := openMmapFile(filepath.Join(dir, "index"))
diff --git a/vendor/github.com/prometheus/tsdb/wal.go b/vendor/github.com/prometheus/tsdb/wal.go
index 9af9a1853..27984ea0c 100644
--- a/vendor/github.com/prometheus/tsdb/wal.go
+++ b/vendor/github.com/prometheus/tsdb/wal.go
@@ -99,9 +99,6 @@ type WALReader interface {
 type RefSeries struct {
 	Ref    uint64
 	Labels labels.Labels
-
-	// hash for the label set. This field is not generally populated.
-	hash uint64
 }
 
 // RefSample is a timestamp/value pair associated with a reference to a series.
@@ -827,7 +824,9 @@ func (r *walReader) Read(seriesf SeriesCB, samplesf SamplesCB, deletesf DeletesC
 			if err != nil {
 				return errors.Wrap(err, "decode series entry")
 			}
-			seriesf(series)
+			if err := seriesf(series); err != nil {
+				return err
+			}
 
 			cf := r.current()
 
@@ -842,7 +841,9 @@ func (r *walReader) Read(seriesf SeriesCB, samplesf SamplesCB, deletesf DeletesC
 			if err != nil {
 				return errors.Wrap(err, "decode samples entry")
 			}
-			samplesf(samples)
+			if err := samplesf(samples); err != nil {
+				return err
+			}
 
 			// Update the times for the WAL segment file.
 			cf := r.current()
@@ -858,7 +859,9 @@ func (r *walReader) Read(seriesf SeriesCB, samplesf SamplesCB, deletesf DeletesC
 			if err != nil {
 				return errors.Wrap(err, "decode delete entry")
 			}
-			deletesf(stones)
+			if err := deletesf(stones); err != nil {
+				return err
+			}
 			// Update the times for the WAL segment file.
 
 			cf := r.current()
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 907fb7e06..2b639724e 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -871,22 +871,22 @@
 			"revisionTime": "2016-04-11T19:08:41Z"
 		},
 		{
-			"checksumSHA1": "mDKxPAubVLTWW/Gar13m7YDHSek=",
+			"checksumSHA1": "B5ndMoK8lqgFJ8xUZ/0V4zCpUw0=",
 			"path": "github.com/prometheus/tsdb",
-			"revision": "3870ec285c4640d462a0ad80e7acbcdf1e939563",
-			"revisionTime": "2017-09-11T08:41:33Z"
+			"revision": "162a48e4f2c6e486a0ebf61cf9cea73a8023ef0a",
+			"revisionTime": "2017-09-19T08:20:19Z"
 		},
 		{
 			"checksumSHA1": "Gua979gmISm4cJP/fR2hL8m5To8=",
 			"path": "github.com/prometheus/tsdb/chunks",
-			"revision": "3870ec285c4640d462a0ad80e7acbcdf1e939563",
-			"revisionTime": "2017-09-11T08:41:33Z"
+			"revision": "162a48e4f2c6e486a0ebf61cf9cea73a8023ef0a",
+			"revisionTime": "2017-09-19T08:20:19Z"
 		},
 		{
 			"checksumSHA1": "zhmlvc322RH1L3l9DaA9d/HVVWs=",
 			"path": "github.com/prometheus/tsdb/labels",
-			"revision": "3870ec285c4640d462a0ad80e7acbcdf1e939563",
-			"revisionTime": "2017-09-11T08:41:33Z"
+			"revision": "162a48e4f2c6e486a0ebf61cf9cea73a8023ef0a",
+			"revisionTime": "2017-09-19T08:20:19Z"
 		},
 		{
 			"checksumSHA1": "5SYLEhADhdBVZAGPVHWggQl7H8k=",