diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a1d9315e..51fb9048e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.17.1 / 2020-03-26
+
+* [BUGFIX] TSDB: Fix query performance regression that increased memory and CPU usage #7051
+
 ## 2.17.0 / 2020-03-24
 
 This release implements isolation in TSDB. API queries and recording rules are
diff --git a/VERSION b/VERSION
index d76bd2ba3..3f8eb714d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.17.0
+2.17.1
diff --git a/tsdb/block.go b/tsdb/block.go
index bcdec5c88..2d26f9038 100644
--- a/tsdb/block.go
+++ b/tsdb/block.go
@@ -111,9 +111,8 @@ type ChunkReader interface {
 
 // BlockReader provides reading access to a data block.
 type BlockReader interface {
-	// Index returns an IndexReader over the block's data within the specified
-	// timeframe.
-	Index(mint, maxt int64) (IndexReader, error)
+	// Index returns an IndexReader over the block's data.
+	Index() (IndexReader, error)
 
 	// Chunks returns a ChunkReader over the block's data.
 	Chunks() (ChunkReader, error)
@@ -373,7 +372,7 @@ func (pb *Block) startRead() error {
 }
 
 // Index returns a new IndexReader against the block data.
-func (pb *Block) Index(mint, maxt int64) (IndexReader, error) {
+func (pb *Block) Index() (IndexReader, error) {
 	if err := pb.startRead(); err != nil {
 		return nil, err
 	}
diff --git a/tsdb/cmd/tsdb/main.go b/tsdb/cmd/tsdb/main.go
index 3b2ebf296..1c4132236 100644
--- a/tsdb/cmd/tsdb/main.go
+++ b/tsdb/cmd/tsdb/main.go
@@ -471,7 +471,7 @@ func analyzeBlock(b tsdb.BlockReader, limit int) error {
 	// Presume 1ms resolution that Prometheus uses.
 	fmt.Printf("Duration: %s\n", (time.Duration(meta.MaxTime-meta.MinTime) * 1e6).String())
 	fmt.Printf("Series: %d\n", meta.Stats.NumSeries)
-	ir, err := b.Index(math.MinInt64, math.MaxInt64)
+	ir, err := b.Index()
 	if err != nil {
 		return err
 	}
diff --git a/tsdb/compact.go b/tsdb/compact.go
index 28bad5119..0fe69ba45 100644
--- a/tsdb/compact.go
+++ b/tsdb/compact.go
@@ -681,7 +681,7 @@ func (c *LeveledCompactor) populateBlock(blocks []BlockReader, meta *BlockMeta,
 			}
 		}
 
-		indexr, err := b.Index(math.MinInt64, globalMaxt)
+		indexr, err := b.Index()
 		if err != nil {
 			return errors.Wrapf(err, "open index reader for block %s", b)
 		}
diff --git a/tsdb/compact_test.go b/tsdb/compact_test.go
index a0a9d7a38..3b72fe02c 100644
--- a/tsdb/compact_test.go
+++ b/tsdb/compact_test.go
@@ -456,10 +456,10 @@ func metaRange(name string, mint, maxt int64, stats *BlockStats) dirMeta {
 
 type erringBReader struct{}
 
-func (erringBReader) Index(int64, int64) (IndexReader, error) { return nil, errors.New("index") }
-func (erringBReader) Chunks() (ChunkReader, error)            { return nil, errors.New("chunks") }
-func (erringBReader) Tombstones() (tombstones.Reader, error)  { return nil, errors.New("tombstones") }
-func (erringBReader) Meta() BlockMeta                         { return BlockMeta{} }
+func (erringBReader) Index() (IndexReader, error)            { return nil, errors.New("index") }
+func (erringBReader) Chunks() (ChunkReader, error)           { return nil, errors.New("chunks") }
+func (erringBReader) Tombstones() (tombstones.Reader, error) { return nil, errors.New("tombstones") }
+func (erringBReader) Meta() BlockMeta                        { return BlockMeta{} }
 
 type nopChunkWriter struct{}
 
diff --git a/tsdb/db_test.go b/tsdb/db_test.go
index 545473f82..29b2bdbea 100644
--- a/tsdb/db_test.go
+++ b/tsdb/db_test.go
@@ -1437,7 +1437,7 @@ func TestChunkAtBlockBoundary(t *testing.T) {
 	testutil.Ok(t, err)
 
 	for _, block := range db.Blocks() {
-		r, err := block.Index(math.MinInt64, math.MaxInt64)
+		r, err := block.Index()
 		testutil.Ok(t, err)
 		defer r.Close()
 
@@ -1787,7 +1787,7 @@ func TestDB_LabelNames(t *testing.T) {
 		appendSamples(db, 0, 4, tst.sampleLabels1)
 
 		// Testing head.
-		headIndexr, err := db.head.Index(math.MinInt64, math.MaxInt64)
+		headIndexr, err := db.head.Index()
 		testutil.Ok(t, err)
 		labelNames, err := headIndexr.LabelNames()
 		testutil.Ok(t, err)
@@ -1800,7 +1800,7 @@ func TestDB_LabelNames(t *testing.T) {
 		// All blocks have same label names, hence check them individually.
 		// No need to aggregate and check.
 		for _, b := range db.Blocks() {
-			blockIndexr, err := b.Index(math.MinInt64, math.MaxInt64)
+			blockIndexr, err := b.Index()
 			testutil.Ok(t, err)
 			labelNames, err = blockIndexr.LabelNames()
 			testutil.Ok(t, err)
diff --git a/tsdb/head.go b/tsdb/head.go
index bbdfead9d..b8494f618 100644
--- a/tsdb/head.go
+++ b/tsdb/head.go
@@ -763,15 +763,8 @@ func NewRangeHead(head *Head, mint, maxt int64) *RangeHead {
 	}
 }
 
-func (h *RangeHead) Index(mint, maxt int64) (IndexReader, error) {
-	// rangeHead guarantees that the series returned are within its range.
-	if mint < h.mint {
-		mint = h.mint
-	}
-	if maxt > h.maxt {
-		maxt = h.maxt
-	}
-	return h.head.indexRange(mint, maxt), nil
+func (h *RangeHead) Index() (IndexReader, error) {
+	return h.head.indexRange(h.mint, h.maxt), nil
 }
 
 func (h *RangeHead) Chunks() (ChunkReader, error) {
@@ -1196,8 +1189,8 @@ func (h *Head) Tombstones() (tombstones.Reader, error) {
 }
 
 // Index returns an IndexReader against the block.
-func (h *Head) Index(mint, maxt int64) (IndexReader, error) {
-	return h.indexRange(mint, maxt), nil
+func (h *Head) Index() (IndexReader, error) {
+	return h.indexRange(math.MinInt64, math.MaxInt64), nil
 }
 
 func (h *Head) indexRange(mint, maxt int64) *headIndexReader {
@@ -1390,37 +1383,9 @@ func (h *headIndexReader) LabelNames() ([]string, error) {
 
 // Postings returns the postings list iterator for the label pairs.
 func (h *headIndexReader) Postings(name string, values ...string) (index.Postings, error) {
-	fullRange := h.mint <= h.head.MinTime() && h.maxt >= h.head.MaxTime()
 	res := make([]index.Postings, 0, len(values))
 	for _, value := range values {
-		p := h.head.postings.Get(name, value)
-		if fullRange {
-			// The head timerange covers the full index reader timerange.
-			// All the series can the be appended without filtering.
-			res = append(res, p)
-			continue
-		}
-
-		// Filter out series not in the time range, to avoid
-		// later on building up all the chunk metadata just to
-		// discard it.
-		filtered := []uint64{}
-		for p.Next() {
-			s := h.head.series.getByID(p.At())
-			if s == nil {
-				level.Debug(h.head.logger).Log("msg", "looked up series not found")
-				continue
-			}
-			s.RLock()
-			if s.minTime() <= h.maxt && s.maxTime() >= h.mint {
-				filtered = append(filtered, p.At())
-			}
-			s.RUnlock()
-		}
-		if p.Err() != nil {
-			return nil, p.Err()
-		}
-		res = append(res, index.NewListPostings(filtered))
+		res = append(res, h.head.postings.Get(name, value))
 	}
 	return index.Merge(res...), nil
 }
diff --git a/tsdb/head_test.go b/tsdb/head_test.go
index 234745c15..3a2f7b0a8 100644
--- a/tsdb/head_test.go
+++ b/tsdb/head_test.go
@@ -1333,94 +1333,6 @@ func TestAddDuplicateLabelName(t *testing.T) {
 	add(labels.Labels{{Name: "__name__", Value: "up"}, {Name: "job", Value: "prometheus"}, {Name: "le", Value: "500"}, {Name: "le", Value: "400"}, {Name: "unit", Value: "s"}}, "le")
 }
 
-func TestHeadSeriesWithTimeBoundaries(t *testing.T) {
-	h, err := NewHead(nil, nil, nil, 15, DefaultStripeSize)
-	testutil.Ok(t, err)
-	defer h.Close()
-	testutil.Ok(t, h.Init(0))
-	app := h.Appender()
-
-	s1, err := app.Add(labels.FromStrings("foo1", "bar"), 2, 0)
-	testutil.Ok(t, err)
-	for ts := int64(3); ts < 13; ts++ {
-		err = app.AddFast(s1, ts, 0)
-		testutil.Ok(t, err)
-	}
-	s2, err := app.Add(labels.FromStrings("foo2", "bar"), 5, 0)
-	testutil.Ok(t, err)
-	for ts := int64(6); ts < 11; ts++ {
-		err = app.AddFast(s2, ts, 0)
-		testutil.Ok(t, err)
-	}
-	s3, err := app.Add(labels.FromStrings("foo3", "bar"), 5, 0)
-	testutil.Ok(t, err)
-	err = app.AddFast(s3, 6, 0)
-	testutil.Ok(t, err)
-	_, err = app.Add(labels.FromStrings("foo4", "bar"), 9, 0)
-	testutil.Ok(t, err)
-
-	testutil.Ok(t, app.Commit())
-
-	cases := []struct {
-		mint         int64
-		maxt         int64
-		seriesCount  int
-		samplesCount int
-	}{
-		// foo1 ..00000000000..
-		// foo2 .....000000....
-		// foo3 .....00........
-		// foo4 .........0.....
-		{mint: 0, maxt: 0, seriesCount: 0, samplesCount: 0},
-		{mint: 0, maxt: 1, seriesCount: 0, samplesCount: 0},
-		{mint: 0, maxt: 2, seriesCount: 1, samplesCount: 1},
-		{mint: 2, maxt: 2, seriesCount: 1, samplesCount: 1},
-		{mint: 0, maxt: 4, seriesCount: 1, samplesCount: 3},
-		{mint: 0, maxt: 5, seriesCount: 3, samplesCount: 6},
-		{mint: 0, maxt: 6, seriesCount: 3, samplesCount: 9},
-		{mint: 0, maxt: 7, seriesCount: 3, samplesCount: 11},
-		{mint: 0, maxt: 8, seriesCount: 3, samplesCount: 13},
-		{mint: 0, maxt: 9, seriesCount: 4, samplesCount: 16},
-		{mint: 0, maxt: 10, seriesCount: 4, samplesCount: 18},
-		{mint: 0, maxt: 11, seriesCount: 4, samplesCount: 19},
-		{mint: 0, maxt: 12, seriesCount: 4, samplesCount: 20},
-		{mint: 0, maxt: 13, seriesCount: 4, samplesCount: 20},
-		{mint: 0, maxt: 14, seriesCount: 4, samplesCount: 20},
-		{mint: 2, maxt: 14, seriesCount: 4, samplesCount: 20},
-		{mint: 3, maxt: 14, seriesCount: 4, samplesCount: 19},
-		{mint: 4, maxt: 14, seriesCount: 4, samplesCount: 18},
-		{mint: 8, maxt: 9, seriesCount: 3, samplesCount: 5},
-		{mint: 9, maxt: 9, seriesCount: 3, samplesCount: 3},
-		{mint: 6, maxt: 9, seriesCount: 4, samplesCount: 10},
-		{mint: 11, maxt: 11, seriesCount: 1, samplesCount: 1},
-		{mint: 11, maxt: 12, seriesCount: 1, samplesCount: 2},
-		{mint: 11, maxt: 14, seriesCount: 1, samplesCount: 2},
-		{mint: 12, maxt: 14, seriesCount: 1, samplesCount: 1},
-	}
-
-	for i, c := range cases {
-		matcher := labels.MustNewMatcher(labels.MatchEqual, "", "")
-		q, err := NewBlockQuerier(h, c.mint, c.maxt)
-		testutil.Ok(t, err)
-
-		seriesCount := 0
-		samplesCount := 0
-		ss, _, err := q.Select(false, nil, matcher)
-		testutil.Ok(t, err)
-		for ss.Next() {
-			i := ss.At().Iterator()
-			for i.Next() {
-				samplesCount++
-			}
-			seriesCount++
-		}
-		testutil.Ok(t, ss.Err())
-		testutil.Equals(t, c.seriesCount, seriesCount, "test series %d", i)
-		testutil.Equals(t, c.samplesCount, samplesCount, "test samples %d", i)
-		q.Close()
-	}
-}
-
 func TestMemSeriesIsolation(t *testing.T) {
 	// Put a series, select it. GC it and then access it.
 	hb, err := NewHead(nil, nil, nil, 1000, DefaultStripeSize)
@@ -1428,7 +1340,7 @@ func TestMemSeriesIsolation(t *testing.T) {
 	defer hb.Close()
 
 	lastValue := func(maxAppendID uint64) int {
-		idx, err := hb.Index(hb.MinTime(), hb.MaxTime())
+		idx, err := hb.Index()
 		testutil.Ok(t, err)
 
 		iso := hb.iso.State()
diff --git a/tsdb/mocks_test.go b/tsdb/mocks_test.go
index a4e47b8cb..913061e83 100644
--- a/tsdb/mocks_test.go
+++ b/tsdb/mocks_test.go
@@ -71,8 +71,8 @@ type mockBReader struct {
 	maxt int64
 }
 
-func (r *mockBReader) Index(mint, maxt int64) (IndexReader, error) { return r.ir, nil }
-func (r *mockBReader) Chunks() (ChunkReader, error)                { return r.cr, nil }
+func (r *mockBReader) Index() (IndexReader, error)  { return r.ir, nil }
+func (r *mockBReader) Chunks() (ChunkReader, error) { return r.cr, nil }
 func (r *mockBReader) Tombstones() (tombstones.Reader, error) {
 	return tombstones.NewMemTombstones(), nil
 }
diff --git a/tsdb/querier.go b/tsdb/querier.go
index e024fb96a..05221127c 100644
--- a/tsdb/querier.go
+++ b/tsdb/querier.go
@@ -154,7 +154,7 @@ func (q *verticalQuerier) sel(sortSeries bool, hints *storage.SelectHints, qs []
 
 // NewBlockQuerier returns a querier against the reader.
 func NewBlockQuerier(b BlockReader, mint, maxt int64) (storage.Querier, error) {
-	indexr, err := b.Index(mint, maxt)
+	indexr, err := b.Index()
 	if err != nil {
 		return nil, errors.Wrapf(err, "open index reader")
 	}
diff --git a/tsdb/querier_bench_test.go b/tsdb/querier_bench_test.go
index 95502be95..3d0a3fbcf 100644
--- a/tsdb/querier_bench_test.go
+++ b/tsdb/querier_bench_test.go
@@ -16,7 +16,6 @@ package tsdb
 import (
 	"fmt"
 	"io/ioutil"
-	"math"
 	"os"
 	"strconv"
 	"testing"
@@ -54,7 +53,7 @@ func BenchmarkPostingsForMatchers(b *testing.B) {
 	}
 	testutil.Ok(b, app.Commit())
 
-	ir, err := h.Index(math.MinInt64, math.MaxInt64)
+	ir, err := h.Index()
 	testutil.Ok(b, err)
 	b.Run("Head", func(b *testing.B) {
 		benchmarkPostingsForMatchers(b, ir)
@@ -72,7 +71,7 @@ func BenchmarkPostingsForMatchers(b *testing.B) {
 	defer func() {
 		testutil.Ok(b, block.Close())
 	}()
-	ir, err = block.Index(math.MinInt64, math.MaxInt64)
+	ir, err = block.Index()
 	testutil.Ok(b, err)
 	defer ir.Close()
 	b.Run("Block", func(b *testing.B) {
diff --git a/tsdb/querier_test.go b/tsdb/querier_test.go
index e4c06d6ca..4de8cf3a6 100644
--- a/tsdb/querier_test.go
+++ b/tsdb/querier_test.go
@@ -2137,7 +2137,7 @@ func TestPostingsForMatchers(t *testing.T) {
 		},
 	}
 
-	ir, err := h.Index(math.MinInt64, math.MaxInt64)
+	ir, err := h.Index()
 	testutil.Ok(t, err)
 
 	for _, c := range cases {