fix(blooms): Fix partitionSeriesByDay function (#12900)

The function `partitionSeriesByDay` could yield empty when chunks were outside of the requested time range.
    
This would result in requests for a time range that does not contain any
chunks for a series to filter. These requests would return errors, because a subsequent `partitionSeriesByDay` for would remove that day resulting in no task.

Signed-off-by: Christian Haudum <[email protected]>

Author: chaudum

pkg/bloomgateway/bloomgateway.go

@@ -274,7 +274,7 @@ func (g *Gateway) FilterChunkRefs(ctx context.Context, req *logproto.FilterChunk
 		"series_requested", len(req.Refs),
 	)
 
-	if len(seriesByDay) != 1 {
+	if len(seriesByDay) > 1 {
 		stats.Status = labelFailure
 		return nil, errors.New("request time range must span exactly one day")
 	}

pkg/bloomgateway/util.go

@@ -2,7 +2,6 @@ package bloomgateway
 
 import (
 	"sort"
-	"time"
 
 	"github.com/prometheus/common/model"
 	"golang.org/x/exp/slices"
@@ -13,13 +12,8 @@ import (
 	"github.com/grafana/loki/v3/pkg/storage/stores/shipper/bloomshipper"
 )
 
-func getDayTime(ts model.Time) time.Time {
-	return ts.Time().UTC().Truncate(Day)
-}
-
 func truncateDay(ts model.Time) model.Time {
-	// model.minimumTick is time.Millisecond
-	return ts - (ts % model.Time(24*time.Hour/time.Millisecond))
+	return model.TimeFromUnix(ts.Time().Truncate(Day).Unix())
 }
 
 // getFromThrough assumes a list of ShortRefs sorted by From time
@@ -125,7 +119,7 @@ func partitionSeriesByDay(from, through model.Time, seriesWithChunks []*logproto
 			})
 
 			// All chunks fall outside of the range
-			if min == len(chunks) || max == 0 {
+			if min == len(chunks) || max == 0 || min == max {
 				continue
 			}
 
@@ -135,7 +129,6 @@ func partitionSeriesByDay(from, through model.Time, seriesWithChunks []*logproto
 			if chunks[max-1].Through > maxTs {
 				maxTs = chunks[max-1].Through
 			}
-			// fmt.Println("day", day, "series", series.Fingerprint, "minTs", minTs, "maxTs", maxTs)
 
 			res = append(res, &logproto.GroupedChunkRefs{
 				Fingerprint: series.Fingerprint,

pkg/bloomgateway/util_test.go

@@ -166,10 +166,46 @@ func TestPartitionRequest(t *testing.T) {
 		exp []seriesWithInterval
 	}{
 
-		"empty": {
+		"no series": {
 			inp: &logproto.FilterChunkRefRequest{
-				From:    ts.Add(-24 * time.Hour),
-				Through: ts,
+				From:    ts.Add(-12 * time.Hour),
+				Through: ts.Add(12 * time.Hour),
+				Refs:    []*logproto.GroupedChunkRefs{},
+			},
+			exp: []seriesWithInterval{},
+		},
+
+		"no chunks for series": {
+			inp: &logproto.FilterChunkRefRequest{
+				From:    ts.Add(-12 * time.Hour),
+				Through: ts.Add(12 * time.Hour),
+				Refs: []*logproto.GroupedChunkRefs{
+					{
+						Fingerprint: 0x00,
+						Refs:        []*logproto.ShortRef{},
+					},
+					{
+						Fingerprint: 0x10,
+						Refs:        []*logproto.ShortRef{},
+					},
+				},
+			},
+			exp: []seriesWithInterval{},
+		},
+
+		"chunks before and after requested day": {
+			inp: &logproto.FilterChunkRefRequest{
+				From:    ts.Add(-2 * time.Hour),
+				Through: ts.Add(2 * time.Hour),
+				Refs: []*logproto.GroupedChunkRefs{
+					{
+						Fingerprint: 0x00,
+						Refs: []*logproto.ShortRef{
+							{From: ts.Add(-13 * time.Hour), Through: ts.Add(-12 * time.Hour)},
+							{From: ts.Add(13 * time.Hour), Through: ts.Add(14 * time.Hour)},
+						},
+					},
+				},
 			},
 			exp: []seriesWithInterval{},
 		},