seaweedfs/go/weed/master.go

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package main
import (
"code.google.com/p/weed-fs/go/glog"
"code.google.com/p/weed-fs/go/util"
"code.google.com/p/weed-fs/go/weed/weed_server"
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"github.com/gorilla/mux"
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"net/http"
"os"
"runtime"
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"strconv"
"strings"
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"time"
)
func init() {
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cmdMaster.Run = runMaster // break init cycle
}
var cmdMaster = &Command{
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UsageLine: "master -port=9333",
Short: "start a master server",
Long: `start a master server to provide volume=>location mapping service
and sequence number of file ids
`,
}
var (
mport = cmdMaster.Flag.Int("port", 9333, "http listen port")
masterIp = cmdMaster.Flag.String("ip", "", "master listening ip address, default to listen on all network interfaces")
mPublicIp = cmdMaster.Flag.String("publicIp", "", "peer accessible <ip>|<server_name>")
metaFolder = cmdMaster.Flag.String("mdir", os.TempDir(), "data directory to store meta data")
masterPeers = cmdMaster.Flag.String("peers", "", "other master nodes in comma separated ip:port list")
volumeSizeLimitMB = cmdMaster.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
mpulse = cmdMaster.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
confFile = cmdMaster.Flag.String("conf", "/etc/weedfs/weedfs.conf", "xml configuration file")
defaultReplicaPlacement = cmdMaster.Flag.String("defaultReplication", "000", "Default replication type if not specified.")
mTimeout = cmdMaster.Flag.Int("idleTimeout", 10, "connection idle seconds")
mMaxCpu = cmdMaster.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
garbageThreshold = cmdMaster.Flag.String("garbageThreshold", "0.3", "threshold to vacuum and reclaim spaces")
masterWhiteListOption = cmdMaster.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
masterWhiteList []string
)
func runMaster(cmd *Command, args []string) bool {
if *mMaxCpu < 1 {
*mMaxCpu = runtime.NumCPU()
}
runtime.GOMAXPROCS(*mMaxCpu)
if err := util.TestFolderWritable(*metaFolder); err != nil {
glog.Fatalf("Check Meta Folder (-mdir) Writable %s : %s", *metaFolder, err)
}
if *masterWhiteListOption != "" {
masterWhiteList = strings.Split(*masterWhiteListOption, ",")
}
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r := mux.NewRouter()
ms := weed_server.NewMasterServer(r, *mport, *metaFolder,
*volumeSizeLimitMB, *mpulse, *confFile, *defaultReplicaPlacement, *garbageThreshold, masterWhiteList,
)
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listeningAddress := *masterIp + ":" + strconv.Itoa(*mport)
glog.V(0).Infoln("Start Weed Master", util.VERSION, "at", listeningAddress)
listener, e := util.NewListener(listeningAddress, time.Duration(*mTimeout)*time.Second)
if e != nil {
glog.Fatalf(e.Error())
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}
go func() {
time.Sleep(100 * time.Millisecond)
if *mPublicIp == "" {
if *masterIp == "" {
*mPublicIp = "localhost"
} else {
*mPublicIp = *masterIp
}
}
myPublicMasterAddress := *mPublicIp + ":" + strconv.Itoa(*mport)
var peers []string
if *masterPeers != "" {
peers = strings.Split(*masterPeers, ",")
}
raftServer := weed_server.NewRaftServer(r, peers, myPublicMasterAddress, *metaFolder, ms.Topo, *mpulse)
ms.SetRaftServer(raftServer)
}()
if e := http.Serve(listener, r); e != nil {
glog.Fatalf("Fail to serve:%s", e.Error())
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}
return true
}