fix: make the tsdb filenames correctly reproducible from the identifi…

…er (#12536)

(cherry picked from commit ec888ec)

pkg/storage/stores/shipper/indexshipper/tsdb/identifier.go

@@ -64,9 +64,14 @@ func (p prefixedIdentifier) Name() string {
 // Identifier has all the information needed to resolve a TSDB index
 // Notably this abstracts away OS path separators, etc.
 type SingleTenantTSDBIdentifier struct {
-	TS            time.Time
-	From, Through model.Time
-	Checksum      uint32
+	// exportTSInSecs tells whether creation timestamp should be exported in unix seconds instead of nanoseconds.
+	// timestamp in filename could be a unix second or a unix nanosecond so
+	// helps us to be able to reproduce filename back from parsed identifier.
+	// Should be true ideally for older files with creation timestamp in seconds.
+	exportTSInSecs bool
+	TS             time.Time
+	From, Through  model.Time
+	Checksum       uint32
 }
 
 // implement Hash
@@ -77,9 +82,15 @@ func (i SingleTenantTSDBIdentifier) Hash(h hash.Hash32) (err error) {
 
 // str builds filename with format <file-creation-ts> + `-` + `compactor` + `-` + <oldest-chunk-start-ts> + `-` + <latest-chunk-end-ts> `-` + <index-checksum>
 func (i SingleTenantTSDBIdentifier) str() string {
+	ts := int64(0)
+	if i.exportTSInSecs {
+		ts = i.TS.Unix()
+	} else {
+		ts = i.TS.UnixNano()
+	}
 	return fmt.Sprintf(
 		"%d-%s-%d-%d-%x.tsdb",
-		i.TS.UnixNano(),
+		ts,
 		compactedFileUploader,
 		i.From,
 		i.Through,
@@ -140,10 +151,11 @@ func ParseSingleTenantTSDBPath(p string) (id SingleTenantTSDBIdentifier, ok bool
 		parsedTS = time.Unix(0, ts)
 	}
 	return SingleTenantTSDBIdentifier{
-		TS:       parsedTS,
-		From:     model.Time(from),
-		Through:  model.Time(through),
-		Checksum: uint32(checksum),
+		exportTSInSecs: len(elems[0]) <= 10,
+		TS:             parsedTS,
+		From:           model.Time(from),
+		Through:        model.Time(through),
+		Checksum:       uint32(checksum),
 	}, true
 
 }

pkg/storage/stores/shipper/indexshipper/tsdb/identifier_test.go

@@ -20,32 +20,35 @@ func TestParseSingleTenantTSDBPath(t *testing.T) {
 			desc:  "simple_works",
 			input: "1-compactor-1-10-ff.tsdb",
 			id: SingleTenantTSDBIdentifier{
-				TS:       time.Unix(1, 0),
-				From:     1,
-				Through:  10,
-				Checksum: 255,
+				exportTSInSecs: true,
+				TS:             time.Unix(1, 0),
+				From:           1,
+				Through:        10,
+				Checksum:       255,
 			},
 			ok: true,
 		},
 		{
 			desc:  "simple_works_with_nanosecond",
 			input: "1712534400000000000-compactor-1-10-ff.tsdb",
 			id: SingleTenantTSDBIdentifier{
-				TS:       time.Unix(0, 1712534400000000000),
-				From:     1,
-				Through:  10,
-				Checksum: 255,
+				exportTSInSecs: false,
+				TS:             time.Unix(0, 1712534400000000000),
+				From:           1,
+				Through:        10,
+				Checksum:       255,
 			},
 			ok: true,
 		},
 		{
 			desc:  "uint32_max_checksum_works",
 			input: fmt.Sprintf("1-compactor-1-10-%x.tsdb", math.MaxUint32),
 			id: SingleTenantTSDBIdentifier{
-				TS:       time.Unix(1, 0),
-				From:     1,
-				Through:  10,
-				Checksum: math.MaxUint32,
+				exportTSInSecs: true,
+				TS:             time.Unix(1, 0),
+				From:           1,
+				Through:        10,
+				Checksum:       math.MaxUint32,
 			},
 			ok: true,
 		},
@@ -69,6 +72,9 @@ func TestParseSingleTenantTSDBPath(t *testing.T) {
 			id, ok := ParseSingleTenantTSDBPath(tc.input)
 			require.Equal(t, tc.ok, ok)
 			require.Equal(t, tc.id, id)
+			if ok {
+				require.Equal(t, tc.input, id.Name())
+			}
 		})
 	}
 }