Fix a data race in the loadWAL function caused by reusing the same er…

…ror var in multiple goroutines (prometheus#9259) (prometheus#9263) Signed-off-by: Callum Styan <[email protected]> Co-authored-by: Callum Styan <[email protected]>
DementevNikita · Aug 27, 2021 · f4c63b9 · f4c63b9
1 parent dcb07e8
commit f4c63b9
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/tsdb/head.go b/tsdb/head.go
@@ -602,6 +602,7 @@ func (h *Head) loadWAL(r *wal.Reader, multiRef map[uint64]uint64, mmappedChunks
 	wg.Add(1)
 	exemplarsInput = make(chan record.RefExemplar, 300)
 	go func(input <-chan record.RefExemplar) {
+		var err error
 		defer wg.Done()
 		for e := range input {
 			ms := h.series.getByID(e.Ref)