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fix(server): rejoin cluster with different ip

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This commit is contained in:
Yicheng Qin
2014-03-20 17:34:17 -07:00
parent d368405d05
commit 273c293645
3 changed files with 131 additions and 2 deletions
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42
server/join_command.go
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@ -29,6 +29,17 @@ func (c *JoinCommandV1) CommandName() string {
return "etcd:join"
}
func (c *JoinCommandV1) updatePeerURL(ps *PeerServer) error {
log.Debugf("Update peer URL of %v to %v", c.Name, c.RaftURL)
if err := ps.registry.UpdatePeerURL(c.Name, c.RaftURL); err != nil {
log.Debugf("Error while updating in registry: %s (%v)", c.Name, err)
return err
}
// Flush commit index, so raft will replay to here when restarted
ps.raftServer.FlushCommitIndex()
return nil
}
// Join a server to the cluster
func (c *JoinCommandV1) Apply(context raft.Context) (interface{}, error) {
ps, _ := context.Server().Context().(*PeerServer)
@ -40,7 +51,15 @@ func (c *JoinCommandV1) Apply(context raft.Context) (interface{}, error) {
ps.registry.Invalidate(c.Name)
// Check if the join command is from a previous peer, who lost all its previous log.
if _, ok := ps.registry.ClientURL(c.Name); ok {
if peerURL, ok := ps.registry.PeerURL(c.Name); ok {
// If previous node restarts with different peer URL,
// update its information.
if peerURL != c.RaftURL {
log.Infof("Rejoin with %v instead of %v from %v", c.RaftURL, peerURL, c.Name)
if err := c.updatePeerURL(ps); err != nil {
return []byte{0}, err
}
}
return b, nil
}
@ -83,6 +102,17 @@ func (c *JoinCommandV2) CommandName() string {
return "etcd:v2:join"
}
func (c *JoinCommandV2) updatePeerURL(ps *PeerServer) error {
log.Debugf("Update peer URL of %v to %v", c.Name, c.PeerURL)
if err := ps.registry.UpdatePeerURL(c.Name, c.PeerURL); err != nil {
log.Debugf("Error while updating in registry: %s (%v)", c.Name, err)
return err
}
// Flush commit index, so raft will replay to here when restart
ps.raftServer.FlushCommitIndex()
return nil
}
// Apply attempts to join a machine to the cluster.
func (c *JoinCommandV2) Apply(context raft.Context) (interface{}, error) {
ps, _ := context.Server().Context().(*PeerServer)
@ -95,7 +125,15 @@ func (c *JoinCommandV2) Apply(context raft.Context) (interface{}, error) {
ps.registry.Invalidate(c.Name)
// Check if the join command is from a previous peer, who lost all its previous log.
if _, ok := ps.registry.ClientURL(c.Name); ok {
if peerURL, ok := ps.registry.PeerURL(c.Name); ok {
// If previous node restarts with different peer URL,
// update its information.
if peerURL != c.PeerURL {
log.Infof("Rejoin with %v instead of %v from %v", c.PeerURL, peerURL, c.Name)
if err := c.updatePeerURL(ps); err != nil {
return []byte{0}, err
}
}
return json.Marshal(msg)
}