Пример #1
0
func start(isWorker bool, z *config.ZookeeperConfig, i *config.InstallConfig, s *config.SparkConfig) {
	// If this is a worker, create a lock file in its working directory
	if isWorker {
		if _, err := lockfile.Create("lock"); err != nil {
			fmt.Fprintf(os.Stderr, "Worker cannot obtain lock (%s)\n", err)
			os.Exit(1)
		}
	}

	// Connect to Zookeeper for anchor file system
	aconn := zanchorfs.Dial(z.Workers)
	anchorfs.Bind(zanchorfs.New(aconn, z.AnchorDir()))

	// Connect to Zookeeper for durable file system
	dconn := zdurablefs.Dial(z.Workers)
	durablefs.Bind(zdurablefs.New(dconn, z.DurableDir()))

	// Connect to Zookeeper for issue file system
	iconn := zissuefs.Dial(z.Workers)
	issuefs.Bind(zissuefs.New(iconn, z.IssueDir()))

	// Initialize the networking module
	worker.Bind(workerBackend.New(i.LibPath, path.Join(i.BinDir(), i.Worker), i.JailDir()))

	// Initialize transport module
	t := transport.New(s.ID, s.BindAddr, s.Host)

	// Initialize language runtime
	circuit.Bind(lang.New(t))

	// Create anchors
	for _, a := range s.Anchor {
		a = strings.TrimSpace(a)
		if err := anchorfs.CreateFile(a, t.Addr()); err != nil {
			fmt.Fprintf(os.Stderr, "Problem creating anchor '%s' (%s)\n", a, err)
			os.Exit(1)
		}
	}

	if isWorker {
		// A worker sends back its PID and runtime port to its invoker (the daemonizer)
		backpipe := os.NewFile(3, "backpipe")
		if _, err := backpipe.WriteString(strconv.Itoa(os.Getpid()) + "\n"); err != nil {
			panic(err)
		}
		if _, err := backpipe.WriteString(strconv.Itoa(t.Port()) + "\n"); err != nil {
			panic(err)
		}
		if err := backpipe.Close(); err != nil {
			panic(err)
		}
		// Hang forever is done in the auto-generated, by 4build, worker main method
	}
}
Пример #2
0
func main() {
	if len(os.Args) != 2 {
		println("Usage:", os.Args[0], "JailDir")
		os.Exit(1)
	}
	jailDir := os.Args[1]

	jail, err := os.Open(jailDir)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Cannot open jail directory (%s)\n", err)
		os.Exit(1)
	}
	defer jail.Close()
	fifi, err := jail.Readdir(0)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Cannot read jail directory (%s)\n", err)
		os.Exit(1)
	}

	for _, fi := range fifi {
		if !fi.IsDir() {
			continue
		}
		if _, err := circuit.ParseWorkerID(fi.Name()); err != nil {
			continue
		}

		workerJail := path.Join(jailDir, fi.Name())
		println("Clearing", workerJail)
		l, err := lockfile.Create(path.Join(workerJail, "lock"))
		if err != nil {
			// This worker is alive; still holding lock; move on
			println(err.Error())
			continue
		}
		l.Release()
		if err := os.RemoveAll(workerJail); err != nil {
			fmt.Fprintf(os.Stderr, "Cannot remove worker jail %s (%s)\n", workerJail, err)
			os.Exit(1)
		}
	}
}