Add deleterange_concurrency to filer configuration file

weed/command/scaffold/filer.toml

@@ -236,3 +236,5 @@ enabled = false
 # If you have many pd address, use ',' split then:
 #   pdaddrs = "pdhost1:2379, pdhost2:2379, pdhost3:2379"
 pdaddrs = "localhost:2379"
+# Concurrency for TiKV delete range
+deleterange_concurrency = 1

weed/filer/tikv/tikv_store.go

@@ -16,6 +16,10 @@ import (
 	"github.com/tikv/client-go/v2/txnkv"
 )
 
+var (
+	_ filer.FilerStore = ((*TikvStore)(nil))
+)
+
 func init() {
 	filer.Stores = append(filer.Stores, &TikvStore{})
 }
@@ -36,7 +40,11 @@ func (store *TikvStore) Initialize(config util.Configuration, prefix string) err
 	for _, item := range strings.Split(pdAddrsStr, ",") {
 		pdAddrs = append(pdAddrs, strings.TrimSpace(item))
 	}
-	store.deleteRangeConcurrency = 1
+	drc := config.GetInt(prefix + "deleterange_concurrency")
+	if drc <= 0 {
+		drc = 1
+	}
+	store.deleteRangeConcurrency = drc
 	return store.initialize(pdAddrs)
 }