shell: add volumeServer.leave command

2 files changed, 68 insertions, 1 deletions

diff --git a/weed/shell/command_volume_server_leave.go b/weed/shell/command_volume_server_leave.go
new file mode 100644
index 000000000..2a2e56e86
--- /dev/null
+++ b/weed/shell/command_volume_server_leave.go
@@ -0,0 +1,67 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"google.golang.org/grpc"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandVolumeServerLeave{})
+}
+
+type commandVolumeServerLeave struct {
+}
+
+func (c *commandVolumeServerLeave) Name() string {
+	return "volumeServer.leave"
+}
+
+func (c *commandVolumeServerLeave) Help() string {
+	return `stop a volume server from sending heartbeats to the master
+
+	volume.unmount -node <volume server host:port> -force
+
+	This command enables gracefully shutting down the volume server.
+	The volume server will stop sending heartbeats to the master.
+	After draining the traffic for a few seconds, you can safely shut down the volume server.
+
+	This operation is not revocable unless the volume server is restarted.
+`
+}
+
+func (c *commandVolumeServerLeave) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	if err = commandEnv.confirmIsLocked(); err != nil {
+		return
+	}
+
+	vsLeaveCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	volumeServer := vsLeaveCommand.String("node", "", "<host>:<port> of the volume server")
+	if err = vsLeaveCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	if *volumeServer == "" {
+		return fmt.Errorf("need to specify volume server by -node=<host>:<port>")
+	}
+
+	return volumeServerLeave(commandEnv.option.GrpcDialOption, *volumeServer, writer)
+
+}
+
+func volumeServerLeave(grpcDialOption grpc.DialOption, volumeServer string, writer io.Writer) (err error) {
+	return operation.WithVolumeServerClient(volumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		_, leaveErr := volumeServerClient.VolumeServerLeave(context.Background(), &volume_server_pb.VolumeServerLeaveRequest{})
+		if leaveErr != nil {
+			fmt.Fprintf(writer, "ask volume server %s to leave: %v\n", volumeServer, leaveErr)
+		} else {
+			fmt.Fprintf(writer, "stopped heartbeat in volume server %s. After a few seconds to drain traffic, it will be safe to stop the volume server.\n", volumeServer)
+		}
+		return leaveErr
+	})
+}
diff --git a/weed/shell/shell_liner.go b/weed/shell/shell_liner.go
index 4632a1fb0..2d5166acf 100644
--- a/weed/shell/shell_liner.go
+++ b/weed/shell/shell_liner.go
@@ -66,7 +66,7 @@ func processEachCmd(reg *regexp.Regexp, cmd string, commandEnv *CommandEnv) bool
 			args[i] = strings.Trim(string(cmds[1+i]), "\"'")
 		}
 
-		cmd := strings.ToLower(cmds[0])
+		cmd := cmds[0]
 		if cmd == "help" || cmd == "?" {
 			printHelp(cmds)
 		} else if cmd == "exit" || cmd == "quit" {