diff --git a/block_test.go b/block_test.go
index 0f164ae06..addb5ea97 100644
--- a/block_test.go
+++ b/block_test.go
@@ -15,7 +15,6 @@ package tsdb
 
 import (
 	"context"
-	"fmt"
 	"io/ioutil"
 	"math/rand"
 	"os"
@@ -70,22 +69,20 @@ func createBlock(tb testing.TB, dir string, nSeries int, mint, maxt int64) strin
 
 	lbls, err := labels.ReadLabels(filepath.Join("testdata", "20kseries.json"), nSeries)
 	testutil.Ok(tb, err)
-	var ref uint64
-
-	fmt.Println(len(lbls))
+	refs := make([]uint64, nSeries)
 
 	for ts := mint; ts <= maxt; ts++ {
 		app := head.Appender()
 		for i, lbl := range lbls {
-			if i > 0 && lbl.String() == lbls[i-1].String() {
-				err := app.AddFast(ref, ts, rand.Float64())
+			if refs[i] != 0 {
+				err := app.AddFast(refs[i], ts, rand.Float64())
 				if err == nil {
 					continue
 				}
 			}
-			ref, err = app.Add(lbl, int64(ts), rand.Float64())
+			ref, err := app.Add(lbl, int64(ts), rand.Float64())
 			testutil.Ok(tb, err)
-
+			refs[i] = ref
 		}
 		err := app.Commit()
 		testutil.Ok(tb, err)
diff --git a/compact.go b/compact.go
index bf19199aa..33cd20adf 100644
--- a/compact.go
+++ b/compact.go
@@ -617,7 +617,6 @@ func (c *LeveledCompactor) populateBlock(blocks []BlockReader, meta *BlockMeta,
 
 	c.metrics.populatingBlocks.Inc()
 
-	fmt.Println(blocks)
 	for i, b := range blocks {
 		select {
 		case <-c.ctx.Done():
@@ -625,8 +624,6 @@ func (c *LeveledCompactor) populateBlock(blocks []BlockReader, meta *BlockMeta,
 		default:
 		}
 
-		fmt.Println("next block")
-
 		indexr, err := b.Index()
 		if err != nil {
 			return errors.Wrapf(err, "open index reader for block %s", b)
@@ -689,7 +686,6 @@ func (c *LeveledCompactor) populateBlock(blocks []BlockReader, meta *BlockMeta,
 		default:
 		}
 
-		// fmt.Println("next set")
 		lset, chks, dranges := set.At() // The chunks here are not fully deleted.
 
 		// Skip the series with all deleted chunks.
diff --git a/compact_test.go b/compact_test.go
index b84cdf8dc..62db4d755 100644
--- a/compact_test.go
+++ b/compact_test.go
@@ -15,7 +15,6 @@ package tsdb
 
 import (
 	"context"
-	"fmt"
 	"io/ioutil"
 	"math"
 	"os"
@@ -753,8 +752,8 @@ func TestCancelCompactions(t *testing.T) {
 	defer os.RemoveAll(tmpdir)
 
 	// Create some blocks to fall within the compaction range.
-	createBlock(t, tmpdir, 1000, 0, 1000)
-	createBlock(t, tmpdir, 1000, 1000, 2000)
+	createBlock(t, tmpdir, 3000, 0, 1000)
+	createBlock(t, tmpdir, 3000, 1000, 2000)
 	createBlock(t, tmpdir, 1, 2000, 2001) // The most recent block is ignored so can be e small one.
 
 	db, err := Open(tmpdir, log.NewNopLogger(), nil, &Options{BlockRanges: []int64{1, 2000}})
@@ -764,8 +763,7 @@ func TestCancelCompactions(t *testing.T) {
 	dbClosed := make(chan struct{})
 	for {
 		if prom_testutil.ToFloat64(db.compactor.(*LeveledCompactor).metrics.populatingBlocks) > 0 {
-			fmt.Println("populating started.")
-			time.Sleep(2 * time.Millisecond)
+			time.Sleep(3 * time.Millisecond)
 			go func() {
 				testutil.Ok(t, db.Close())
 				close(dbClosed)
diff --git a/db.go b/db.go
index a580ea240..bfa52840c 100644
--- a/db.go
+++ b/db.go
@@ -819,9 +819,7 @@ func (db *DB) Head() *Head {
 // Close the partition.
 func (db *DB) Close() error {
 	close(db.stopc)
-	// fmt.Println("closing")
-	// db.compactCnl()
-	// fmt.Println("closed")
+	db.compactCnl()
 	<-db.donec
 
 	db.mtx.Lock()