add range flag for delete in etcdctl

CHANGELOG/CHANGELOG-3.6.md

@@ -12,6 +12,7 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0...v3.6.0).
 
 - `etcd` will no longer start on data dir created by newer versions (for example etcd v3.6 will not run on v3.7+ data dir). To downgrade data dir please check out `etcdutl migrate` command.
 - `etcd` doesn't support serving client requests on the peer listen endpoints (--listen-peer-urls). See [pull/13565](https://github.com/etcd-io/etcd/pull/13565).
+- `etcdctl` will sleep(2s) in case of range delete without `--range` flag.See [pull/13747](https://github.com/etcd-io/etcd/pull/13747)
 
 ### Deprecations
 

etcdctl/ctlv3/command/del_command.go

@@ -16,6 +16,8 @@ package command
 
 import (
 	"fmt"
+	"os"
+	"time"
 
 	"github.com/spf13/cobra"
 	"go.etcd.io/etcd/client/v3"
@@ -26,6 +28,7 @@ var (
 	delPrefix  bool
 	delPrevKV  bool
 	delFromKey bool
+	delRange   bool
 )
 
 // NewDelCommand returns the cobra command for "del".
@@ -39,6 +42,7 @@ func NewDelCommand() *cobra.Command {
 	cmd.Flags().BoolVar(&delPrefix, "prefix", false, "delete keys with matching prefix")
 	cmd.Flags().BoolVar(&delPrevKV, "prev-kv", false, "return deleted key-value pairs")
 	cmd.Flags().BoolVar(&delFromKey, "from-key", false, "delete keys that are greater than or equal to the given key using byte compare")
+	cmd.Flags().BoolVar(&delRange, "range", false, "delete range of keys")
 	return cmd
 }
 
@@ -70,6 +74,11 @@ func getDelOp(args []string) (string, []clientv3.OpOption) {
 			cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("too many arguments, only accept one argument when `--prefix` or `--from-key` is set"))
 		}
 		opts = append(opts, clientv3.WithRange(args[1]))
+		if !delRange {
+			fmt.Fprintf(os.Stderr, "Warning: Keys between %q and %q will be deleted. Please interrupt the command within next 2 seconds to cancel. "+
+				"You can provide `--range` flag to avoid the delay.\n", args[0], args[1])
+			time.Sleep(2 * time.Second)
+		}
 	}
 
 	if delPrefix {