fixing help message printing

weed-fs/src/cmd/weed/command.go

@@ -38,7 +38,10 @@ func (c *Command) Name() string {
 }
 
 func (c *Command) Usage() {
-  fmt.Fprintf(os.Stderr, "Usage: %s\n", c.UsageLine)
+  fmt.Fprintf(os.Stderr, "Example: weed %s\n", c.UsageLine)
+  fmt.Fprintf(os.Stderr, "Default Usage:\n")
+  c.Flag.PrintDefaults()
+  fmt.Fprintf(os.Stderr, "Description:\n")
   fmt.Fprintf(os.Stderr, "  %s\n", strings.TrimSpace(c.Long))
   os.Exit(2)
 }

weed-fs/src/cmd/weed/master.go

@@ -8,6 +8,7 @@ import (
 	"pkg/storage"
 	"strconv"
 	"strings"
+	"time"
 )
 
 func init() {
@@ -30,6 +31,7 @@ var (
 	capacity          = cmdMaster.Flag.Int("capacity", 100, "maximum number of volumes to hold")
 	mapper            *directory.Mapper
 	volumeSizeLimitMB = cmdMaster.Flag.Uint("volumeSizeLimitMB", 32*1024, "Default Volume Size in MegaBytes")
+	mpulse            = cmdMaster.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
 )
 
 func dirLookupHandler(w http.ResponseWriter, r *http.Request) {
@@ -64,7 +66,7 @@ func dirJoinHandler(w http.ResponseWriter, r *http.Request) {
 	if *IsDebug {
 		log.Println(s, "volumes", r.FormValue("volumes"))
 	}
-	mapper.Add(directory.NewMachine(s, publicUrl, *volumes))
+	mapper.Add(directory.NewMachine(s, publicUrl, *volumes, time.Now().Unix()))
 }
 func dirStatusHandler(w http.ResponseWriter, r *http.Request) {
 	writeJson(w, r, mapper)
@@ -72,7 +74,7 @@ func dirStatusHandler(w http.ResponseWriter, r *http.Request) {
 
 func runMaster(cmd *Command, args []string) bool {
 	log.Println("Volume Size Limit is", *volumeSizeLimitMB, "MB")
-	mapper = directory.NewMapper(*metaFolder, "directory", uint64(*volumeSizeLimitMB)*1024*1024)
+	mapper = directory.NewMapper(*metaFolder, "directory", uint64(*volumeSizeLimitMB)*1024*1024, *mpulse)
 	http.HandleFunc("/dir/assign", dirAssignHandler)
 	http.HandleFunc("/dir/lookup", dirLookupHandler)
 	http.HandleFunc("/dir/join", dirJoinHandler)

weed-fs/src/cmd/weed/volume.go

@@ -30,7 +30,7 @@ var (
 	volumes     = cmdVolume.Flag.String("volumes", "0,1-3,4", "comma-separated list of volume ids or range of ids")
 	publicUrl   = cmdVolume.Flag.String("publicUrl", "localhost:8080", "public url to serve data read")
 	metaServer  = cmdVolume.Flag.String("mserver", "localhost:9333", "master directory server to store mappings")
-	pulse       = cmdVolume.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
+	vpulse      = cmdVolume.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
 
 	store *storage.Store
 )
@@ -162,7 +162,7 @@ func runVolume(cmd *Command, args []string) bool {
 	go func() {
 		for {
 			store.Join(*metaServer)
-			time.Sleep(time.Duration(float32(*pulse*1e3)*(1+rand.Float32())) * time.Millisecond)
+			time.Sleep(time.Duration(float32(*vpulse*1e3)*(1+rand.Float32())) * time.Millisecond)
 		}
 	}()
 	log.Println("store joined at", *metaServer)

weed-fs/src/cmd/weed/weed.go

@@ -52,7 +52,7 @@ func main() {
 	if args[0] == "help" {
 		help(args[1:])
 		for _, cmd := range commands {
-			if len(args)>2 && cmd.Name() == args[1] && cmd.Run != nil {
+			if len(args)>=2 && cmd.Name() == args[1] && cmd.Run != nil {
 				fmt.Fprintf(os.Stderr, "Default Parameters:\n")
 				cmd.Flag.PrintDefaults()
 			}
@@ -93,12 +93,6 @@ The commands are:
 
 Use "weed help [command]" for more information about a command.
 
-Additional help topics:
-{{range .}}{{if not .Runnable}}
-    {{.Name | printf "%-11s"}} {{.Short}}{{end}}{{end}}
-
-Use "weed help [topic]" for more information about that topic.
-
 `
 
 var helpTemplate = `{{if .Runnable}}Usage: weed {{.UsageLine}}

weed-fs/src/pkg/directory/volume_mapping.go

@@ -7,36 +7,38 @@ import (
 	"pkg/sequence"
 	"pkg/storage"
 	"pkg/util"
-	"sync"
+	"time"
 )
 
 type Machine struct {
 	Volumes   []storage.VolumeInfo
 	Url       string //<server name/ip>[:port]
 	PublicUrl string
+	LastSeen  int64 // unix time in seconds
 }
 
 type Mapper struct {
-	volumeLock    sync.Mutex
 	Machines    map[string]*Machine
-	vid2machineId map[storage.VolumeId]*Machine //machineId is +1 of the index of []*Machine, to detect not found entries
+	vid2machine map[storage.VolumeId]*Machine
 	Writers     []storage.VolumeId // transient array of Writers volume id
+	pulse       int64
 
 	volumeSizeLimit uint64
 
 	sequence sequence.Sequencer
 }
 
-func NewMachine(server, publicUrl string, volumes []storage.VolumeInfo) *Machine {
-	return &Machine{Url: server, PublicUrl: publicUrl, Volumes: volumes}
+func NewMachine(server, publicUrl string, volumes []storage.VolumeInfo, lastSeen int64) *Machine {
+	return &Machine{Url: server, PublicUrl: publicUrl, Volumes: volumes, LastSeen: lastSeen}
 }
 
-func NewMapper(dirname string, filename string, volumeSizeLimit uint64) (m *Mapper) {
+func NewMapper(dirname string, filename string, volumeSizeLimit uint64, pulse int) (m *Mapper) {
 	m = &Mapper{}
-	m.vid2machineId = make(map[storage.VolumeId]*Machine)
+	m.vid2machine = make(map[storage.VolumeId]*Machine)
 	m.volumeSizeLimit = volumeSizeLimit
 	m.Writers = *new([]storage.VolumeId)
 	m.Machines = make(map[string]*Machine)
+	m.pulse = int64(pulse)
 
 	m.sequence = sequence.NewSequencer(dirname, filename)
 
@@ -49,7 +51,7 @@ func (m *Mapper) PickForWrite(c string) (string, int, *Machine, error) {
 		return "", 0, nil, errors.New("No more writable volumes!")
 	}
 	vid := m.Writers[rand.Intn(len_writers)]
-	machine := m.vid2machineId[vid]
+	machine := m.vid2machine[vid]
 	if machine != nil {
 		fileId, count := m.sequence.NextFileId(util.ParseInt(c, 1))
 		if count == 0 {
@@ -60,31 +62,41 @@ func (m *Mapper) PickForWrite(c string) (string, int, *Machine, error) {
 	return "", 0, nil, errors.New("Strangely vid " + vid.String() + " is on no machine!")
 }
 func (m *Mapper) Get(vid storage.VolumeId) (*Machine, error) {
-	machine := m.vid2machineId[vid]
+	machine := m.vid2machine[vid]
 	if machine == nil {
 		return nil, errors.New("invalid volume id " + vid.String())
 	}
 	return machine, nil
 }
 func (m *Mapper) Add(machine *Machine) {
-	//check existing machine, linearly
-	//log.Println("Adding machine", machine.Server.Url)
-	m.volumeLock.Lock()
 	m.Machines[machine.Url] = machine
-	m.volumeLock.Unlock()
-
-	//add to vid2machineId map, and Writers array
+	//add to vid2machine map, and Writers array
 	for _, v := range machine.Volumes {
-		m.vid2machineId[v.Id] = machine
+		m.vid2machine[v.Id] = machine
+	}
+	m.refreshWritableVolumes()
+}
+func (m *Mapper) StartRefreshWritableVolumes() {
+	go func() {
+		for {
+			m.refreshWritableVolumes()
+			time.Sleep(time.Duration(float32(m.pulse*1e3)*(1+rand.Float32())) * time.Millisecond)
 		}
+	}()
+}
+
+func (m *Mapper) refreshWritableVolumes() {
+	freshThreshHold := time.Now().Unix() - 5*m.pulse //5 times of sleep interval
 	//setting Writers, copy-on-write because of possible updating, this needs some future work!
 	var writers []storage.VolumeId
 	for _, machine_entry := range m.Machines {
+		if machine_entry.LastSeen > freshThreshHold {
 			for _, v := range machine_entry.Volumes {
 				if uint64(v.Size) < m.volumeSizeLimit {
 					writers = append(writers, v.Id)
 				}
 			}
 		}
+	}
 	m.Writers = writers
 }