// SetSize sets the maximum number of nodes in a cluster.
func (c *ClusterManager) SetSize(size int) error {
kvdb := kvdb.Instance()
kvlock, err := kvdb.Lock(clusterLockKey, 20)
if err != nil {
dlog.Warnln("Unable to obtain cluster lock for updating config", err)
return nil
}
defer kvdb.Unlock(kvlock)
db, err := readDatabase()
if err != nil {
return err
}
db.Size = size
err = writeDatabase(&db)
return err
}
func (c *ClusterManager) getLatestNodeConfig(nodeId string) *NodeEntry {
kvdb := kvdb.Instance()
kvlock, err := kvdb.Lock("cluster/lock", 20)
if err != nil {
logrus.Warn(" Unable to obtain cluster lock for updating config", err)
return nil
}
defer kvdb.Unlock(kvlock)
db, err := readDatabase()
if err != nil {
logrus.Warn("Failed to read the database for updating config")
return nil
}
ne, exists := db.NodeEntries[nodeId]
if !exists {
logrus.Warn("Could not find info for node with id ", nodeId)
return nil
}
return &ne
}
func (c *ClusterManager) Start() error {
logrus.Info("Cluster manager starting...")
c.gEnabled = true
c.selfNode = api.Node{}
c.selfNode.GenNumber = uint64(time.Now().UnixNano())
c.selfNode.Id = c.config.NodeId
c.selfNode.Status = api.StatusOk
c.selfNode.Ip, _ = externalIp(&c.config)
c.selfNode.NodeData = make(map[string]interface{})
c.system = systemutils.New()
// Start the gossip protocol.
// XXX Make the port configurable.
gob.Register(api.Node{})
c.g = gossip.New("0.0.0.0:9002", types.NodeId(c.config.NodeId),
c.selfNode.GenNumber)
c.g.SetGossipInterval(2 * time.Second)
kvdb := kvdb.Instance()
kvlock, err := kvdb.Lock("cluster/lock", 60)
if err != nil {
logrus.Panic("Fatal, Unable to obtain cluster lock.", err)
}
defer kvdb.Unlock(kvlock)
db, err := readDatabase()
if err != nil {
logrus.Panic(err)
}
if db.Status == api.StatusInit {
logrus.Info("Will initialize a new cluster.")
c.status = api.StatusOk
db.Status = api.StatusOk
self, _ := c.initNode(&db)
err = c.initCluster(&db, self, false)
if err != nil {
logrus.Error("Failed to initialize the cluster.", err)
return err
}
// Update the new state of the cluster in the KV Database
err := writeDatabase(&db)
if err != nil {
logrus.Error("Failed to save the database.", err)
return err
}
} else if db.Status&api.StatusOk > 0 {
logrus.Info("Cluster state is OK... Joining the cluster.")
c.status = api.StatusOk
self, exist := c.initNode(&db)
err = c.joinCluster(&db, self, exist)
if err != nil {
logrus.Error("Failed to join cluster.", err)
return err
}
err := writeDatabase(&db)
if err != nil {
return err
}
} else {
return errors.New("Fatal, Cluster is in an unexpected state.")
}
// Start heartbeating to other nodes.
c.g.Start()
go c.heartBeat()
return nil
}
func (c *ClusterManager) Start() error {
dlog.Infoln("Cluster manager starting...")
c.gEnabled = true
c.selfNode = api.Node{}
c.selfNode.GenNumber = uint64(time.Now().UnixNano())
c.selfNode.Id = c.config.NodeId
c.selfNode.Status = api.Status_STATUS_OK
c.selfNode.MgmtIp, c.selfNode.DataIp, _ = ExternalIp(&c.config)
c.selfNode.NodeData = make(map[string]interface{})
c.system = systemutils.New()
// Start the gossip protocol.
// XXX Make the port configurable.
gob.Register(api.Node{})
c.gossip = gossip.New("0.0.0.0:9002", types.NodeId(c.config.NodeId),
c.selfNode.GenNumber)
c.gossip.SetGossipInterval(2 * time.Second)
kvdb := kvdb.Instance()
kvlock, err := kvdb.Lock(clusterLockKey, 60)
if err != nil {
dlog.Panicln("Fatal, Unable to obtain cluster lock.", err)
}
defer kvdb.Unlock(kvlock)
db, err := readDatabase()
if err != nil {
dlog.Panicln(err)
}
// Cluster database max size... 0 if unlimited.
c.size = db.Size
if db.Status == api.Status_STATUS_INIT {
dlog.Infoln("Will initialize a new cluster.")
c.status = api.Status_STATUS_OK
db.Status = api.Status_STATUS_OK
self, _ := c.initNode(&db)
err = c.initCluster(&db, self, false)
if err != nil {
dlog.Errorln("Failed to initialize the cluster.", err)
return err
}
// Update the new state of the cluster in the KV Database
err := writeDatabase(&db)
if err != nil {
dlog.Errorln("Failed to save the database.", err)
return err
}
} else if db.Status&api.Status_STATUS_OK > 0 {
dlog.Infoln("Cluster state is OK... Joining the cluster.")
c.status = api.Status_STATUS_OK
self, exist := c.initNode(&db)
err = c.joinCluster(&db, self, exist)
if err != nil {
dlog.Errorln("Failed to join cluster.", err)
return err
}
err := writeDatabase(&db)
if err != nil {
return err
}
} else {
return errors.New("Fatal, Cluster is in an unexpected state.")
}
// Start heartbeating to other nodes.
go c.startHeartBeat()
go c.updateClusterStatus()
kvdb.WatchKey(ClusterDBKey, 0, nil, c.watchDB)
return nil
}