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|
package shell
import (
"context"
"flag"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/operation"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/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
volumeServer.leave -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) {
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 err = commandEnv.confirmIsLocked(args); err != nil {
return
}
if *volumeServer == "" {
return fmt.Errorf("need to specify volume server by -node=<host>:<port>")
}
return volumeServerLeave(commandEnv.option.GrpcDialOption, pb.ServerAddress(*volumeServer), writer)
}
func volumeServerLeave(grpcDialOption grpc.DialOption, volumeServer pb.ServerAddress, writer io.Writer) (err error) {
return operation.WithVolumeServerClient(false, 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
})
}
|
