Implement methods in persistence.go.

Change-Id: I804cdd0b30420e171825fd86fe1281eca0d5e638

storage/local/codec/codec.go

@@ -266,15 +266,15 @@ func (vs *CodableLabelValues) UnmarshalBinary(buf []byte) error {
 }
 
 type CodableTimeRange struct {
-	first, last clientmodel.Timestamp
+	First, Last clientmodel.Timestamp
 }
 
 func (tr CodableTimeRange) MarshalBinary() ([]byte, error) {
 	buf := &bytes.Buffer{}
-	if err := EncodeVarint(buf, int64(tr.first)); err != nil {
+	if err := EncodeVarint(buf, int64(tr.First)); err != nil {
 		return nil, err
 	}
-	if err := EncodeVarint(buf, int64(tr.last)); err != nil {
+	if err := EncodeVarint(buf, int64(tr.Last)); err != nil {
 		return nil, err
 	}
 	return buf.Bytes(), nil
@@ -290,7 +290,7 @@ func (tr *CodableTimeRange) UnmarshalBinary(buf []byte) error {
 	if err != nil {
 		return err
 	}
-	tr.first = clientmodel.Timestamp(first)
-	tr.last = clientmodel.Timestamp(last)
+	tr.First = clientmodel.Timestamp(first)
+	tr.Last = clientmodel.Timestamp(last)
 	return nil
 }

storage/local/codec/codec_test.go

@@ -23,16 +23,16 @@ func TestCodec(t *testing.T) {
 		equal func(in, out codable) bool
 	}{
 		{
-			in: CodableMetric{
+			in: &CodableMetric{
 				"label_1": "value_2",
 				"label_2": "value_2",
 				"label_3": "value_3",
 			},
-			out: CodableMetric{},
+			out: &CodableMetric{},
 			equal: func(in, out codable) bool {
-				m1 := clientmodel.Metric(in.(CodableMetric))
-				m2 := clientmodel.Metric(out.(CodableMetric))
-				return m1.Equal(m2)
+				m1 := (*clientmodel.Metric)(in.(*CodableMetric))
+				m2 := (*clientmodel.Metric)(out.(*CodableMetric))
+				return m1.Equal(*m2)
 			},
 		}, {
 			in:  newCodableFingerprint(12345),

storage/local/index/index.go

@@ -56,15 +56,9 @@ func (i *FingerprintMetricIndex) UnindexBatch(mapping FingerprintMetricMapping)
 }
 
 // Lookup looks up a metric by fingerprint.
-func (i *FingerprintMetricIndex) Lookup(fp clientmodel.Fingerprint) (clientmodel.Metric, bool, error) {
-	m := codec.CodableMetric{}
-	if ok, err := i.Get(codec.CodableFingerprint(fp), &m); !ok {
-		return nil, false, nil
-	} else if err != nil {
-		return nil, false, err
-	}
-
-	return clientmodel.Metric(m), true, nil
+func (i *FingerprintMetricIndex) Lookup(fp clientmodel.Fingerprint) (metric clientmodel.Metric, ok bool, err error) {
+	ok, err = i.Get(codec.CodableFingerprint(fp), (*codec.CodableMetric)(&metric))
+	return
 }
 
 // NewFingerprintMetricIndex returns a FingerprintMetricIndex
@@ -110,14 +104,64 @@ func (i *LabelNameLabelValuesIndex) IndexBatch(b LabelNameLabelValuesMapping) er
 // Lookup looks up all label values for a given label name.
 func (i *LabelNameLabelValuesIndex) Lookup(l clientmodel.LabelName) (values clientmodel.LabelValues, ok bool, err error) {
 	ok, err = i.Get(codec.CodableLabelName(l), (*codec.CodableLabelValues)(&values))
-	if err != nil {
-		return nil, false, err
-	}
-	if !ok {
-		return nil, false, nil
-	}
+	return
+}
 
-	return values, true, nil
+func (i *LabelNameLabelValuesIndex) Extend(m clientmodel.Metric) error {
+	b := make(LabelNameLabelValuesMapping, len(m))
+	for ln, lv := range m {
+		baseLVs, _, err := i.Lookup(ln)
+		if err != nil {
+			return err
+		}
+		lvSet := utility.Set{}
+		for _, baseLV := range baseLVs {
+			lvSet.Add(baseLV)
+		}
+		lvSet.Add(lv)
+		if len(lvSet) == len(baseLVs) {
+			continue
+		}
+		lvs := make(clientmodel.LabelValues, 0, len(lvSet))
+		for v := range lvSet {
+			lvs = append(lvs, v.(clientmodel.LabelValue))
+		}
+		b[ln] = lvs
+	}
+	return i.IndexBatch(b)
+}
+
+func (i *LabelNameLabelValuesIndex) Reduce(m LabelPairFingerprintsMapping) error {
+	b := make(LabelNameLabelValuesMapping, len(m))
+	for lp, fps := range m {
+		if len(fps) != 0 {
+			continue
+		}
+		ln := lp.Name
+		lv := lp.Value
+		baseValues, ok := b[ln]
+		if !ok {
+			var err error
+			baseValues, _, err = i.Lookup(ln)
+			if err != nil {
+				return err
+			}
+		}
+		lvSet := utility.Set{}
+		for _, baseValue := range baseValues {
+			lvSet.Add(baseValue)
+		}
+		lvSet.Remove(lv)
+		if len(lvSet) == len(baseValues) {
+			continue
+		}
+		lvs := make(clientmodel.LabelValues, 0, len(lvSet))
+		for v := range lvSet {
+			lvs = append(lvs, v.(clientmodel.LabelValue))
+		}
+		b[ln] = lvs
+	}
+	return i.IndexBatch(b)
 }
 
 // NewLabelNameLabelValuesIndex returns a LabelNameLabelValuesIndex
@@ -163,14 +207,59 @@ func (i *LabelPairFingerprintIndex) IndexBatch(m LabelPairFingerprintsMapping) e
 // Lookup looks up all fingerprints for a given label pair.
 func (i *LabelPairFingerprintIndex) Lookup(p metric.LabelPair) (fps clientmodel.Fingerprints, ok bool, err error) {
 	ok, err = i.Get((codec.CodableLabelPair)(p), (*codec.CodableFingerprints)(&fps))
-	if !ok {
-		return nil, false, nil
-	}
-	if err != nil {
-		return nil, false, err
-	}
+	return
+}
 
-	return fps, true, nil
+func (i *LabelPairFingerprintIndex) Extend(m clientmodel.Metric, fp clientmodel.Fingerprint) error {
+	b := make(LabelPairFingerprintsMapping, len(m))
+	for ln, lv := range m {
+		lp := metric.LabelPair{Name: ln, Value: lv}
+		baseFPs, _, err := i.Lookup(lp)
+		if err != nil {
+			return err
+		}
+		fpSet := utility.Set{}
+		for _, baseFP := range baseFPs {
+			fpSet.Add(baseFP)
+		}
+		fpSet.Add(fp)
+		if len(fpSet) == len(baseFPs) {
+			continue
+		}
+		fps := make(clientmodel.Fingerprints, 0, len(fpSet))
+		for f := range fpSet {
+			fps = append(fps, f.(clientmodel.Fingerprint))
+		}
+		b[lp] = fps
+
+	}
+	return i.IndexBatch(b)
+}
+
+func (i *LabelPairFingerprintIndex) Reduce(m clientmodel.Metric, fp clientmodel.Fingerprint) (LabelPairFingerprintsMapping, error) {
+	b := make(LabelPairFingerprintsMapping, len(m))
+	for ln, lv := range m {
+		lp := metric.LabelPair{Name: ln, Value: lv}
+		baseFPs, _, err := i.Lookup(lp)
+		if err != nil {
+			return nil, err
+		}
+		fpSet := utility.Set{}
+		for _, baseFP := range baseFPs {
+			fpSet.Add(baseFP)
+		}
+		fpSet.Remove(fp)
+		if len(fpSet) == len(baseFPs) {
+			continue
+		}
+		fps := make(clientmodel.Fingerprints, 0, len(fpSet))
+		for f := range fpSet {
+			fps = append(fps, f.(clientmodel.Fingerprint))
+		}
+		b[lp] = fps
+
+	}
+	return b, i.IndexBatch(b)
 }
 
 // NewLabelPairFingerprintIndex returns a LabelPairFingerprintIndex
@@ -194,15 +283,11 @@ type FingerprintTimeRangeIndex struct {
 	KeyValueStore
 }
 
-// UnindexBatch unindexes a batch of fingerprints.
-func (i *FingerprintTimeRangeIndex) UnindexBatch(b FingerprintMetricMapping) error {
-	batch := i.NewBatch()
-
-	for fp, _ := range b {
-		batch.Delete(codec.CodableFingerprint(fp))
-	}
-
-	return i.Commit(batch)
+// Lookup returns the time range for the given fingerprint.
+func (i *FingerprintTimeRangeIndex) Lookup(fp clientmodel.Fingerprint) (firstTime, lastTime clientmodel.Timestamp, ok bool, err error) {
+	var tr codec.CodableTimeRange
+	ok, err = i.Get(codec.CodableFingerprint(fp), &tr)
+	return tr.First, tr.Last, ok, err
 }
 
 // Has returns true if the given fingerprint is present.
@@ -224,227 +309,3 @@ func NewFingerprintTimeRangeIndex(basePath string) (*FingerprintTimeRangeIndex,
 		KeyValueStore: fingerprintTimeRangeDB,
 	}, nil
 }
-
-func findUnindexed(i *FingerprintTimeRangeIndex, b FingerprintMetricMapping) (FingerprintMetricMapping, error) {
-	// TODO: Move up? Need to include fp->ts map?
-	out := FingerprintMetricMapping{}
-
-	for fp, m := range b {
-		has, err := i.Has(fp)
-		if err != nil {
-			return nil, err
-		}
-		if !has {
-			out[fp] = m
-		}
-	}
-
-	return out, nil
-}
-
-func findIndexed(i *FingerprintTimeRangeIndex, b FingerprintMetricMapping) (FingerprintMetricMapping, error) {
-	// TODO: Move up? Need to include fp->ts map?
-	out := FingerprintMetricMapping{}
-
-	for fp, m := range b {
-		has, err := i.Has(fp)
-		if err != nil {
-			return nil, err
-		}
-		if has {
-			out[fp] = m
-		}
-	}
-
-	return out, nil
-}
-
-func extendLabelNameToLabelValuesIndex(i *LabelNameLabelValuesIndex, b FingerprintMetricMapping) (LabelNameLabelValuesMapping, error) {
-	// TODO: Move up? Need to include fp->ts map?
-	collection := map[clientmodel.LabelName]utility.Set{}
-
-	for _, m := range b {
-		for l, v := range m {
-			set, ok := collection[l]
-			if !ok {
-				baseValues, _, err := i.Lookup(l)
-				if err != nil {
-					return nil, err
-				}
-
-				set = utility.Set{}
-
-				for _, baseValue := range baseValues {
-					set.Add(baseValue)
-				}
-
-				collection[l] = set
-			}
-
-			set.Add(v)
-		}
-	}
-
-	batch := LabelNameLabelValuesMapping{}
-	for l, set := range collection {
-		values := make(clientmodel.LabelValues, 0, len(set))
-		for e := range set {
-			val := e.(clientmodel.LabelValue)
-			values = append(values, val)
-		}
-
-		batch[l] = values
-	}
-
-	return batch, nil
-}
-
-func reduceLabelNameToLabelValuesIndex(i *LabelNameLabelValuesIndex, m LabelPairFingerprintsMapping) (LabelNameLabelValuesMapping, error) {
-	// TODO: Move up? Need to include fp->ts map?
-	collection := map[clientmodel.LabelName]utility.Set{}
-
-	for lp, fps := range m {
-		if len(fps) != 0 {
-			continue
-		}
-
-		set, ok := collection[lp.Name]
-		if !ok {
-			baseValues, _, err := i.Lookup(lp.Name)
-			if err != nil {
-				return nil, err
-			}
-
-			set = utility.Set{}
-
-			for _, baseValue := range baseValues {
-				set.Add(baseValue)
-			}
-
-			collection[lp.Name] = set
-		}
-
-		set.Remove(lp.Value)
-	}
-
-	batch := LabelNameLabelValuesMapping{}
-	for l, set := range collection {
-		values := make(clientmodel.LabelValues, 0, len(set))
-		for e := range set {
-			val := e.(clientmodel.LabelValue)
-			values = append(values, val)
-		}
-
-		batch[l] = values
-	}
-	return batch, nil
-}
-
-func extendLabelPairIndex(i *LabelPairFingerprintIndex, b FingerprintMetricMapping, remove bool) (LabelPairFingerprintsMapping, error) {
-	// TODO: Move up? Need to include fp->ts map?
-	collection := map[metric.LabelPair]utility.Set{}
-
-	for fp, m := range b {
-		for n, v := range m {
-			pair := metric.LabelPair{
-				Name:  n,
-				Value: v,
-			}
-			set, ok := collection[pair]
-			if !ok {
-				baseFps, _, err := i.Lookup(pair)
-				if err != nil {
-					return nil, err
-				}
-
-				set = utility.Set{}
-				for _, baseFp := range baseFps {
-					set.Add(baseFp)
-				}
-
-				collection[pair] = set
-			}
-
-			if remove {
-				set.Remove(fp)
-			} else {
-				set.Add(fp)
-			}
-		}
-	}
-
-	batch := LabelPairFingerprintsMapping{}
-
-	for pair, set := range collection {
-		fps := batch[pair]
-		for element := range set {
-			fp := element.(clientmodel.Fingerprint)
-			fps = append(fps, fp)
-		}
-		batch[pair] = fps
-	}
-
-	return batch, nil
-}
-
-// TODO: Move IndexMetrics and UndindexMetrics into storage.go.
-
-/*
-// IndexMetrics adds the facets of all unindexed metrics found in the given
-// FingerprintMetricMapping to the corresponding indices.
-func (i *diskIndexer) IndexMetrics(b FingerprintMetricMapping) error {
-	unindexed, err := findUnindexed(i.FingerprintTimeRange, b)
-	if err != nil {
-		return err
-	}
-
-	labelNames, err := extendLabelNameToLabelValuesIndex(i.LabelNameToLabelValues, unindexed)
-	if err != nil {
-		return err
-	}
-	if err := i.LabelNameToLabelValues.IndexBatch(labelNames); err != nil {
-		return err
-	}
-
-	labelPairs, err := extendLabelPairIndex(i.LabelPairToFingerprints, unindexed, false)
-	if err != nil {
-		return err
-	}
-	if err := i.LabelPairToFingerprints.IndexBatch(labelPairs); err != nil {
-		return err
-	}
-
-	if err := i.FingerprintToMetric.IndexBatch(unindexed); err != nil {
-		return err
-	}
-
-	return i.FingerprintTimeRange.IndexBatch(unindexed)
-}
-
-// UnindexMetrics implements MetricIndexer.
-func (i *diskIndexer) UnindexMetrics(b FingerprintMetricMapping) error {
-	indexed, err := findIndexed(i.FingerprintTimeRange, b)
-	if err != nil {
-		return err
-	}
-
-	labelPairs, err := extendLabelPairIndex(i.LabelPairToFingerprints, indexed, true)
-	if err != nil {
-		return err
-	}
-	if err := i.LabelPairToFingerprints.IndexBatch(labelPairs); err != nil {
-		return err
-	}
-
-	labelNames, err := reduceLabelNameToLabelValuesIndex(i.LabelNameToLabelValues, labelPairs)
-	if err := i.LabelNameToLabelValues.IndexBatch(labelNames); err != nil {
-		return err
-	}
-
-	if err := i.FingerprintToMetric.UnindexBatch(indexed); err != nil {
-		return err
-	}
-
-	return i.FingerprintTimeRange.UnindexBatch(indexed)
-}
-*/

storage/local/index/index_test.go

@@ -1,252 +0,0 @@
-package index
-
-import (
-	"sort"
-	"testing"
-
-	clientmodel "github.com/prometheus/client_golang/model"
-
-	"github.com/prometheus/prometheus/storage/metric"
-	"github.com/prometheus/prometheus/utility/test"
-)
-
-type incrementalBatch struct {
-	fpToMetric      FingerprintMetricMapping
-	expectedLnToLvs LabelNameLabelValuesMapping
-	expectedLpToFps LabelPairFingerprintsMapping
-}
-
-func newTestDB(t *testing.T) (KeyValueStore, test.Closer) {
-	dir := test.NewTemporaryDirectory("test_db", t)
-	db, err := NewLevelDB(LevelDBOptions{
-		Path: dir.Path(),
-	})
-	if err != nil {
-		dir.Close()
-		t.Fatal("failed to create test DB: ", err)
-	}
-	return db, test.NewCallbackCloser(func() {
-		db.Close()
-		dir.Close()
-	})
-}
-
-func verifyIndexedState(i int, t *testing.T, b incrementalBatch, indexedFpsToMetrics FingerprintMetricMapping, indexer *diskIndexer) {
-	for fp, m := range indexedFpsToMetrics {
-		// Compare indexed metrics with input metrics.
-		mOut, ok, err := indexer.FingerprintToMetric.Lookup(fp)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if !ok {
-			t.Fatalf("%d. fingerprint %v not found", i, fp)
-		}
-		if !mOut.Equal(m) {
-			t.Fatalf("%d. %v: Got: %s; want %s", i, fp, mOut, m)
-		}
-
-		// Check that indexed metrics are in membership index.
-		ok, err = indexer.FingerprintMembership.Has(fp)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if !ok {
-			t.Fatalf("%d. fingerprint %v not found", i, fp)
-		}
-	}
-
-	// Compare label name -> label values mappings.
-	for ln, lvs := range b.expectedLnToLvs {
-		outLvs, ok, err := indexer.LabelNameToLabelValues.Lookup(ln)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if !ok {
-			t.Fatalf("%d. label name %s not found", i, ln)
-		}
-
-		sort.Sort(lvs)
-		sort.Sort(outLvs)
-
-		if len(lvs) != len(outLvs) {
-			t.Fatalf("%d. different number of label values. Got: %d; want %d", i, len(outLvs), len(lvs))
-		}
-		for j, _ := range lvs {
-			if lvs[j] != outLvs[j] {
-				t.Fatalf("%d.%d. label values don't match. Got: %s; want %s", i, j, outLvs[j], lvs[j])
-			}
-		}
-	}
-
-	// Compare label pair -> fingerprints mappings.
-	for lp, fps := range b.expectedLpToFps {
-		outFps, ok, err := indexer.LabelPairToFingerprints.Lookup(&lp)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if !ok {
-			t.Fatalf("%d. label pair %v not found", i, lp)
-		}
-
-		sort.Sort(fps)
-		sort.Sort(outFps)
-
-		if len(fps) != len(outFps) {
-			t.Fatalf("%d. %v: different number of fingerprints. Got: %d; want %d", i, lp, len(outFps), len(fps))
-		}
-		for j, _ := range fps {
-			if fps[j] != outFps[j] {
-				t.Fatalf("%d.%d. %v: fingerprints don't match. Got: %d; want %d", i, j, lp, outFps[j], fps[j])
-			}
-		}
-	}
-}
-
-func TestIndexing(t *testing.T) {
-	batches := []incrementalBatch{
-		{
-			fpToMetric: FingerprintMetricMapping{
-				0: {
-					clientmodel.MetricNameLabel: "metric_0",
-					"label_1":                   "value_1",
-				},
-				1: {
-					clientmodel.MetricNameLabel: "metric_0",
-					"label_2":                   "value_2",
-					"label_3":                   "value_3",
-				},
-				2: {
-					clientmodel.MetricNameLabel: "metric_1",
-					"label_1":                   "value_2",
-				},
-			},
-			expectedLnToLvs: LabelNameLabelValuesMapping{
-				clientmodel.MetricNameLabel: clientmodel.LabelValues{"metric_0", "metric_1"},
-				"label_1":                   clientmodel.LabelValues{"value_1", "value_2"},
-				"label_2":                   clientmodel.LabelValues{"value_2"},
-				"label_3":                   clientmodel.LabelValues{"value_3"},
-			},
-			expectedLpToFps: LabelPairFingerprintsMapping{
-				metric.LabelPair{
-					Name:  clientmodel.MetricNameLabel,
-					Value: "metric_0",
-				}: {0, 1},
-				metric.LabelPair{
-					Name:  clientmodel.MetricNameLabel,
-					Value: "metric_1",
-				}: {2},
-				metric.LabelPair{
-					Name:  "label_1",
-					Value: "value_1",
-				}: {0},
-				metric.LabelPair{
-					Name:  "label_1",
-					Value: "value_2",
-				}: {2},
-				metric.LabelPair{
-					Name:  "label_2",
-					Value: "value_2",
-				}: {1},
-				metric.LabelPair{
-					Name:  "label_3",
-					Value: "value_3",
-				}: {1},
-			},
-		}, {
-			fpToMetric: FingerprintMetricMapping{
-				3: {
-					clientmodel.MetricNameLabel: "metric_0",
-					"label_1":                   "value_3",
-				},
-				4: {
-					clientmodel.MetricNameLabel: "metric_2",
-					"label_2":                   "value_2",
-					"label_3":                   "value_1",
-				},
-				5: {
-					clientmodel.MetricNameLabel: "metric_1",
-					"label_1":                   "value_3",
-				},
-			},
-			expectedLnToLvs: LabelNameLabelValuesMapping{
-				clientmodel.MetricNameLabel: clientmodel.LabelValues{"metric_0", "metric_1", "metric_2"},
-				"label_1":                   clientmodel.LabelValues{"value_1", "value_2", "value_3"},
-				"label_2":                   clientmodel.LabelValues{"value_2"},
-				"label_3":                   clientmodel.LabelValues{"value_1", "value_3"},
-			},
-			expectedLpToFps: LabelPairFingerprintsMapping{
-				metric.LabelPair{
-					Name:  clientmodel.MetricNameLabel,
-					Value: "metric_0",
-				}: {0, 1, 3},
-				metric.LabelPair{
-					Name:  clientmodel.MetricNameLabel,
-					Value: "metric_1",
-				}: {2, 5},
-				metric.LabelPair{
-					Name:  clientmodel.MetricNameLabel,
-					Value: "metric_2",
-				}: {4},
-				metric.LabelPair{
-					Name:  "label_1",
-					Value: "value_1",
-				}: {0},
-				metric.LabelPair{
-					Name:  "label_1",
-					Value: "value_2",
-				}: {2},
-				metric.LabelPair{
-					Name:  "label_1",
-					Value: "value_3",
-				}: {3, 5},
-				metric.LabelPair{
-					Name:  "label_2",
-					Value: "value_2",
-				}: {1, 4},
-				metric.LabelPair{
-					Name:  "label_3",
-					Value: "value_1",
-				}: {4},
-				metric.LabelPair{
-					Name:  "label_3",
-					Value: "value_3",
-				}: {1},
-			},
-		},
-	}
-
-	fpToMetricDB, fpToMetricCloser := newTestDB(t)
-	defer fpToMetricCloser.Close()
-	lnToLvsDB, lnToLvsCloser := newTestDB(t)
-	defer lnToLvsCloser.Close()
-	lpToFpDB, lpToFpCloser := newTestDB(t)
-	defer lpToFpCloser.Close()
-	fpMsDB, fpMsCloser := newTestDB(t)
-	defer fpMsCloser.Close()
-
-	indexer := diskIndexer{
-		FingerprintToMetric:     NewFingerprintMetricIndex(fpToMetricDB),
-		LabelNameToLabelValues:  NewLabelNameLabelValuesIndex(lnToLvsDB),
-		LabelPairToFingerprints: NewLabelPairFingerprintIndex(lpToFpDB),
-		FingerprintMembership:   NewFingerprintMembershipIndex(fpMsDB),
-	}
-
-	indexedFpsToMetrics := FingerprintMetricMapping{}
-	for i, b := range batches {
-		indexer.IndexMetrics(b.fpToMetric)
-		for fp, m := range b.fpToMetric {
-			indexedFpsToMetrics[fp] = m
-		}
-
-		verifyIndexedState(i, t, b, indexedFpsToMetrics, &indexer)
-	}
-
-	for i := len(batches) - 1; i >= 0; i-- {
-		b := batches[i]
-		verifyIndexedState(i, t, batches[i], indexedFpsToMetrics, &indexer)
-		indexer.UnindexMetrics(b.fpToMetric)
-		for fp, _ := range b.fpToMetric {
-			delete(indexedFpsToMetrics, fp)
-		}
-	}
-}

storage/local/index/leveldb.go

@@ -53,7 +53,7 @@ func (l *LevelDB) Close() error {
 func (l *LevelDB) Get(key encoding.BinaryMarshaler, value encoding.BinaryUnmarshaler) (bool, error) {
 	k, err := key.MarshalBinary()
 	if err != nil {
-		return false, nil
+		return false, err
 	}
 	raw, err := l.storage.Get(k, l.readOpts)
 	if err == leveldb.ErrNotFound {

storage/local/interface.go

@@ -75,14 +75,14 @@ type Persistence interface {
 
 	// IndexMetric indexes the given metric for the needs of
 	// GetFingerprintsForLabelPair and GetLabelValuesForLabelName.
-	IndexMetric(clientmodel.Metric) error
+	IndexMetric(clientmodel.Metric, clientmodel.Fingerprint) error
 	// UnindexMetric removes references to the given metric from the indexes
 	// used for GetFingerprintsForLabelPair and
 	// GetLabelValuesForLabelName. The index of fingerprints to archived
 	// metrics is not affected by this method. (In fact, never call this
 	// method for an archived metric. To drop an archived metric, call
 	// DropArchivedFingerprint.)
-	UnindexMetric(clientmodel.Metric) error
+	UnindexMetric(clientmodel.Metric, clientmodel.Fingerprint) error
 
 	// ArchiveMetric persists the mapping of the given fingerprint to the
 	// given metric, together with the first and last timestamp of the

storage/local/persistence.go

@@ -401,44 +401,80 @@ func (p *diskPersistence) DropChunks(fp clientmodel.Fingerprint, beforeTime clie
 	return false, nil
 }
 
-func (d *diskPersistence) IndexMetric(m clientmodel.Metric) error {
-	// TODO: Implement. Possibly in a queue (which needs to be drained before shutdown).
-	return nil
+func (d *diskPersistence) IndexMetric(m clientmodel.Metric, fp clientmodel.Fingerprint) error {
+	// TODO: Don't do it directly, but add it to a queue (which needs to be
+	// drained before shutdown). Queuing would make this asynchronously, and
+	// then batches could be created easily.
+	if err := d.labelNameToLabelValues.Extend(m); err != nil {
+		return err
+	}
+	return d.labelPairToFingerprints.Extend(m, fp)
 }
 
-func (d *diskPersistence) UnindexMetric(m clientmodel.Metric) error {
-	// TODO: Implement. Possibly in a queue (which needs to be drained before shutdown).
-	return nil
+func (d *diskPersistence) UnindexMetric(m clientmodel.Metric, fp clientmodel.Fingerprint) error {
+	// TODO: Don't do it directly, but add it to a queue (which needs to be
+	// drained before shutdown). Queuing would make this asynchronously, and
+	// then batches could be created easily.
+	labelPairs, err := d.labelPairToFingerprints.Reduce(m, fp)
+	if err != nil {
+		return err
+	}
+	return d.labelNameToLabelValues.Reduce(labelPairs)
 }
 
 func (d *diskPersistence) ArchiveMetric(
-	fingerprint clientmodel.Fingerprint, metric clientmodel.Metric,
-	firstTime, lastTime clientmodel.Timestamp,
+	// TODO: Two step process, make sure this happens atomically.
+	fp clientmodel.Fingerprint, m clientmodel.Metric, first, last clientmodel.Timestamp,
 ) error {
-	// TODO: Implement.
+	if err := d.archivedFingerprintToMetrics.Put(codec.CodableFingerprint(fp), codec.CodableMetric(m)); err != nil {
+		return err
+	}
+	if err := d.archivedFingerprintToTimeRange.Put(codec.CodableFingerprint(fp), codec.CodableTimeRange{First: first, Last: last}); err != nil {
+		return err
+	}
 	return nil
 }
 
-func (d *diskPersistence) HasArchivedMetric(clientmodel.Fingerprint) (
+func (d *diskPersistence) HasArchivedMetric(fp clientmodel.Fingerprint) (
 	hasMetric bool, firstTime, lastTime clientmodel.Timestamp, err error,
 ) {
-	// TODO: Implement.
+	firstTime, lastTime, hasMetric, err = d.archivedFingerprintToTimeRange.Lookup(fp)
 	return
 }
 
-func (d *diskPersistence) GetArchivedMetric(clientmodel.Fingerprint) (clientmodel.Metric, error) {
-	// TODO: Implement.
-	return nil, nil
+func (d *diskPersistence) GetArchivedMetric(fp clientmodel.Fingerprint) (clientmodel.Metric, error) {
+	metric, _, err := d.archivedFingerprintToMetrics.Lookup(fp)
+	return metric, err
 }
 
-func (d *diskPersistence) DropArchivedMetric(clientmodel.Fingerprint) error {
-	// TODO: Implement. Unindex after drop!
-	return nil
+func (d *diskPersistence) DropArchivedMetric(fp clientmodel.Fingerprint) error {
+	// TODO: Multi-step process, make sure this happens atomically.
+	metric, err := d.GetArchivedMetric(fp)
+	if err != nil || metric == nil {
+		return err
+	}
+	if err := d.archivedFingerprintToMetrics.Delete(codec.CodableFingerprint(fp)); err != nil {
+		return err
+	}
+	if err := d.archivedFingerprintToTimeRange.Delete(codec.CodableFingerprint(fp)); err != nil {
+		return err
+	}
+	return d.UnindexMetric(metric, fp)
 }
 
-func (d *diskPersistence) UnarchiveMetric(clientmodel.Fingerprint) (bool, error) {
-	// TODO: Implement.
-	return false, nil
+func (d *diskPersistence) UnarchiveMetric(fp clientmodel.Fingerprint) (bool, error) {
+	// TODO: Multi-step process, make sure this happens atomically.
+	has, err := d.archivedFingerprintToTimeRange.Has(fp)
+	if err != nil || !has {
+		return false, err
+	}
+	if err := d.archivedFingerprintToMetrics.Delete(codec.CodableFingerprint(fp)); err != nil {
+		return false, err
+	}
+	if err := d.archivedFingerprintToTimeRange.Delete(codec.CodableFingerprint(fp)); err != nil {
+		return false, err
+	}
+	return true, nil
 }
 
 func (d *diskPersistence) Close() error {

storage/local/persistence_test.go

@@ -1,10 +1,12 @@
 package storage_ng
 
 import (
+	"sort"
 	"testing"
 
 	clientmodel "github.com/prometheus/client_golang/model"
 
+	"github.com/prometheus/prometheus/storage/local/index"
 	"github.com/prometheus/prometheus/storage/metric"
 	"github.com/prometheus/prometheus/utility/test"
 )
@@ -89,3 +91,226 @@ func TestPersistChunk(t *testing.T) {
 		}
 	}
 }
+
+type incrementalBatch struct {
+	fpToMetric      index.FingerprintMetricMapping
+	expectedLnToLvs index.LabelNameLabelValuesMapping
+	expectedLpToFps index.LabelPairFingerprintsMapping
+}
+
+func TestIndexing(t *testing.T) {
+	batches := []incrementalBatch{
+		{
+			fpToMetric: index.FingerprintMetricMapping{
+				0: {
+					clientmodel.MetricNameLabel: "metric_0",
+					"label_1":                   "value_1",
+				},
+				1: {
+					clientmodel.MetricNameLabel: "metric_0",
+					"label_2":                   "value_2",
+					"label_3":                   "value_3",
+				},
+				2: {
+					clientmodel.MetricNameLabel: "metric_1",
+					"label_1":                   "value_2",
+				},
+			},
+			expectedLnToLvs: index.LabelNameLabelValuesMapping{
+				clientmodel.MetricNameLabel: clientmodel.LabelValues{"metric_0", "metric_1"},
+				"label_1":                   clientmodel.LabelValues{"value_1", "value_2"},
+				"label_2":                   clientmodel.LabelValues{"value_2"},
+				"label_3":                   clientmodel.LabelValues{"value_3"},
+			},
+			expectedLpToFps: index.LabelPairFingerprintsMapping{
+				metric.LabelPair{
+					Name:  clientmodel.MetricNameLabel,
+					Value: "metric_0",
+				}: {0, 1},
+				metric.LabelPair{
+					Name:  clientmodel.MetricNameLabel,
+					Value: "metric_1",
+				}: {2},
+				metric.LabelPair{
+					Name:  "label_1",
+					Value: "value_1",
+				}: {0},
+				metric.LabelPair{
+					Name:  "label_1",
+					Value: "value_2",
+				}: {2},
+				metric.LabelPair{
+					Name:  "label_2",
+					Value: "value_2",
+				}: {1},
+				metric.LabelPair{
+					Name:  "label_3",
+					Value: "value_3",
+				}: {1},
+			},
+		}, {
+			fpToMetric: index.FingerprintMetricMapping{
+				3: {
+					clientmodel.MetricNameLabel: "metric_0",
+					"label_1":                   "value_3",
+				},
+				4: {
+					clientmodel.MetricNameLabel: "metric_2",
+					"label_2":                   "value_2",
+					"label_3":                   "value_1",
+				},
+				5: {
+					clientmodel.MetricNameLabel: "metric_1",
+					"label_1":                   "value_3",
+				},
+			},
+			expectedLnToLvs: index.LabelNameLabelValuesMapping{
+				clientmodel.MetricNameLabel: clientmodel.LabelValues{"metric_0", "metric_1", "metric_2"},
+				"label_1":                   clientmodel.LabelValues{"value_1", "value_2", "value_3"},
+				"label_2":                   clientmodel.LabelValues{"value_2"},
+				"label_3":                   clientmodel.LabelValues{"value_1", "value_3"},
+			},
+			expectedLpToFps: index.LabelPairFingerprintsMapping{
+				metric.LabelPair{
+					Name:  clientmodel.MetricNameLabel,
+					Value: "metric_0",
+				}: {0, 1, 3},
+				metric.LabelPair{
+					Name:  clientmodel.MetricNameLabel,
+					Value: "metric_1",
+				}: {2, 5},
+				metric.LabelPair{
+					Name:  clientmodel.MetricNameLabel,
+					Value: "metric_2",
+				}: {4},
+				metric.LabelPair{
+					Name:  "label_1",
+					Value: "value_1",
+				}: {0},
+				metric.LabelPair{
+					Name:  "label_1",
+					Value: "value_2",
+				}: {2},
+				metric.LabelPair{
+					Name:  "label_1",
+					Value: "value_3",
+				}: {3, 5},
+				metric.LabelPair{
+					Name:  "label_2",
+					Value: "value_2",
+				}: {1, 4},
+				metric.LabelPair{
+					Name:  "label_3",
+					Value: "value_1",
+				}: {4},
+				metric.LabelPair{
+					Name:  "label_3",
+					Value: "value_3",
+				}: {1},
+			},
+		},
+	}
+
+	p, closer := newTestPersistence(t)
+	defer closer.Close()
+
+	indexedFpsToMetrics := index.FingerprintMetricMapping{}
+	for i, b := range batches {
+		for fp, m := range b.fpToMetric {
+			if err := p.IndexMetric(m, fp); err != nil {
+				t.Fatal(err)
+			}
+			if err := p.ArchiveMetric(fp, m, 1, 2); err != nil {
+				t.Fatal(err)
+			}
+			indexedFpsToMetrics[fp] = m
+		}
+		verifyIndexedState(i, t, b, indexedFpsToMetrics, p.(*diskPersistence))
+	}
+
+	for i := len(batches) - 1; i >= 0; i-- {
+		b := batches[i]
+		verifyIndexedState(i, t, batches[i], indexedFpsToMetrics, p.(*diskPersistence))
+		for fp, m := range b.fpToMetric {
+			if err := p.UnindexMetric(m, fp); err != nil {
+				t.Fatal(err)
+			}
+			unarchived, err := p.UnarchiveMetric(fp)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !unarchived {
+				t.Errorf("%d. metric not unarchived", i)
+			}
+			delete(indexedFpsToMetrics, fp)
+		}
+	}
+}
+
+func verifyIndexedState(i int, t *testing.T, b incrementalBatch, indexedFpsToMetrics index.FingerprintMetricMapping, p *diskPersistence) {
+	for fp, m := range indexedFpsToMetrics {
+		// Compare archived metrics with input metrics.
+		mOut, err := p.GetArchivedMetric(fp)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !mOut.Equal(m) {
+			t.Errorf("%d. %v: Got: %s; want %s", i, fp, mOut, m)
+		}
+
+		// Check that archived metrics are in membership index.
+		has, first, last, err := p.HasArchivedMetric(fp)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !has {
+			t.Errorf("%d. fingerprint %v not found", i, fp)
+		}
+		if first != 1 || last != 2 {
+			t.Errorf(
+				"%d. %v: Got first: %d, last %d; want first: %d, last %d",
+				i, fp, first, last, 1, 2,
+			)
+		}
+	}
+
+	// Compare label name -> label values mappings.
+	for ln, lvs := range b.expectedLnToLvs {
+		outLvs, err := p.GetLabelValuesForLabelName(ln)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		sort.Sort(lvs)
+		sort.Sort(outLvs)
+
+		if len(lvs) != len(outLvs) {
+			t.Errorf("%d. different number of label values. Got: %d; want %d", i, len(outLvs), len(lvs))
+		}
+		for j, _ := range lvs {
+			if lvs[j] != outLvs[j] {
+				t.Errorf("%d.%d. label values don't match. Got: %s; want %s", i, j, outLvs[j], lvs[j])
+			}
+		}
+	}
+
+	// Compare label pair -> fingerprints mappings.
+	for lp, fps := range b.expectedLpToFps {
+		outFps, err := p.GetFingerprintsForLabelPair(lp)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		sort.Sort(fps)
+		sort.Sort(outFps)
+
+		if len(fps) != len(outFps) {
+			t.Errorf("%d. %v: different number of fingerprints. Got: %d; want %d", i, lp, len(outFps), len(fps))
+		}
+		for j, _ := range fps {
+			if fps[j] != outFps[j] {
+				t.Errorf("%d.%d. %v: fingerprints don't match. Got: %d; want %d", i, j, lp, outFps[j], fps[j])
+			}
+		}
+	}
+}

storage/local/storage.go

@@ -126,7 +126,7 @@ func (s *memorySeriesStorage) getOrCreateSeries(m clientmodel.Metric) *memorySer
 			series.chunkDescsLoaded = false
 		} else {
 			// This was a genuinely new series, so index the metric.
-			if err := s.persistence.IndexMetric(m); err != nil {
+			if err := s.persistence.IndexMetric(m, fp); err != nil {
 				glog.Errorf("Error indexing metric %v: %v", m, err)
 			}
 		}
@@ -286,7 +286,9 @@ func (s *memorySeriesStorage) purgeSeries(fp clientmodel.Fingerprint) {
 	// persistence.PersistChunck needs to be locked on fp level, or
 	// something. And even then, what happens if everything is dropped, but
 	// there are still chunks hung in the persist queue? They would later
-	// re-create a file for a series that doesn't exist anymore...
+	// re-create a file for a series that doesn't exist anymore...  But
+	// there is the ref count, which is one higher if you have not yet
+	// persisted the chunk.
 	defer s.mtx.Unlock()
 
 	// First purge persisted chunks. We need to do that anyway.
@@ -299,15 +301,16 @@ func (s *memorySeriesStorage) purgeSeries(fp clientmodel.Fingerprint) {
 	if series, ok := s.fingerprintToSeries[fp]; ok {
 		if series.purgeOlderThan(ts) {
 			delete(s.fingerprintToSeries, fp)
-			if err := s.persistence.UnindexMetric(series.metric); err != nil {
+			if err := s.persistence.UnindexMetric(series.metric, fp); err != nil {
 				glog.Errorf("Error unindexing metric %v: %v", series.metric, err)
 			}
 		}
 		return
 	}
 
-	// If nothing was in memory, the metric must have been archived. Drop
-	// the archived metric if there are no persisted chunks left.
+	// If we arrive here, nothing was in memory, so the metric must have
+	// been archived. Drop the archived metric if there are no persisted
+	// chunks left.
 	if !allDropped {
 		return
 	}