From 2a462d5e42c0fb413a37e10261a41476d62bdfbe Mon Sep 17 00:00:00 2001 From: Travis Turner Date: Thu, 8 Mar 2018 14:18:10 -0600 Subject: [PATCH] make sure cluster.Nodes[].IsCoordinator values get updated. return old coordinator node in response. --- broadcast.go | 5 + cluster.go | 53 +++++-- cluster_test.go | 12 +- handler.go | 15 +- internal/private.pb.go | 312 +++++++++++++++++++++++++++++------------ internal/private.proto | 4 + server.go | 2 + 7 files changed, 295 insertions(+), 108 deletions(-) diff --git a/broadcast.go b/broadcast.go index 6dbb0f771..a4e6403c1 100644 --- a/broadcast.go +++ b/broadcast.go @@ -134,6 +134,7 @@ const ( MessageTypeResizeInstruction MessageTypeResizeInstructionComplete MessageTypeSetCoordinator + MessageTypeUpdateCoordinator MessageTypeNodeState MessageTypeRecalculateCaches MessageTypeNodeEvent @@ -173,6 +174,8 @@ func MarshalMessage(m proto.Message) ([]byte, error) { typ = MessageTypeResizeInstructionComplete case *internal.SetCoordinatorMessage: typ = MessageTypeSetCoordinator + case *internal.UpdateCoordinatorMessage: + typ = MessageTypeUpdateCoordinator case *internal.NodeStateMessage: typ = MessageTypeNodeState case *internal.RecalculateCaches: @@ -225,6 +228,8 @@ func UnmarshalMessage(buf []byte) (proto.Message, error) { m = &internal.ResizeInstructionComplete{} case MessageTypeSetCoordinator: m = &internal.SetCoordinatorMessage{} + case MessageTypeUpdateCoordinator: + m = &internal.UpdateCoordinatorMessage{} case MessageTypeNodeState: m = &internal.NodeStateMessage{} case MessageTypeRecalculateCaches: diff --git a/cluster.go b/cluster.go index b93e6105c..a5b7b654f 100644 --- a/cluster.go +++ b/cluster.go @@ -309,20 +309,51 @@ func (c *Cluster) IsCoordinator() bool { return c.Coordinator == c.Node.ID } -// SetCoordinator updates the Coordinator to n. -// Returns true if the Coordinator changed. -func (c *Cluster) SetCoordinator(n *Node) bool { - // Get new node. - newNode := c.nodeByID(n.ID) - if newNode == nil { - return false +// SetCoordinator tells the current node to become the +// Coordinator. In response to this, the current node +// will consider itself coordinator and update the other +// nodes with its version of Cluster.Status. +func (c *Cluster) SetCoordinator(n *Node) error { + // Verify that the new Coordinator value matches + // this node. + if c.Node.ID != n.ID { + return fmt.Errorf("coordinator node does not match this node") } - if c.Coordinator != newNode.ID { - c.Coordinator = newNode.ID - return true + // Update IsCoordinator on all nodes (locally). + _ = c.UpdateCoordinator(n) + + // Send the update coordinator message to all nodes. + err := c.Broadcaster.SendSync( + &internal.UpdateCoordinatorMessage{ + New: EncodeNode(n), + }) + if err != nil { + return fmt.Errorf("problem sending UpdateCoordinator message: %v", err) } - return false + + // Broadcast cluster status. + return c.Broadcaster.SendSync(c.Status()) +} + +// UpdateCoordinator updates this nodes Coordinator value as well as +// changing the corresponding node's IsCoordinator value +// to true, and sets all other nodes to false. Returns true if the value +// changed. +func (c *Cluster) UpdateCoordinator(n *Node) bool { + var changed bool + if c.Coordinator != n.ID { + c.Coordinator = n.ID + changed = true + } + for _, node := range c.Nodes { + if node.ID == n.ID { + node.IsCoordinator = true + } else { + node.IsCoordinator = false + } + } + return changed } // AddNode adds a node to the Cluster and updates and saves the diff --git a/cluster_test.go b/cluster_test.go index 5c5c5f89c..c5c01d58d 100644 --- a/cluster_test.go +++ b/cluster_test.go @@ -509,22 +509,22 @@ func TestCluster_ResizeStates(t *testing.T) { } // Ensures that coordinator can be changed. -func TestCluster_SetCoordinator(t *testing.T) { - t.Run("SetCoordinator", func(t *testing.T) { +func TestCluster_UpdateCoordinator(t *testing.T) { + t.Run("UpdateCoordinator", func(t *testing.T) { c := test.NewCluster(2) oldNode := c.Nodes[0] newNode := c.Nodes[1] - // Set coordinator to the same value. - if c.SetCoordinator(oldNode) { + // Update coordinator to the same value. + if c.UpdateCoordinator(oldNode) { t.Errorf("did not expect coordinator to change") } else if c.Coordinator != oldNode.ID { t.Errorf("expected coordinator: %s, but got: %s", c.Coordinator, oldNode.URI) } - // Set coordinator to a new value. - if !c.SetCoordinator(newNode) { + // Update coordinator to a new value. + if !c.UpdateCoordinator(newNode) { t.Errorf("expected coordinator to change") } else if c.Coordinator != newNode.ID { t.Errorf("expected coordinator: %s, but got: %s", c.Coordinator, newNode.URI) diff --git a/handler.go b/handler.go index 38fd24eca..cea42e6ac 100644 --- a/handler.go +++ b/handler.go @@ -2026,6 +2026,7 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r return } + oldNode := h.Cluster.nodeByID(h.Cluster.Coordinator) newNode := h.Cluster.nodeByID(req.ID) if newNode == nil { http.Error(w, "Node with provided ID does not exist", http.StatusBadRequest) @@ -2033,8 +2034,14 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r } if err := func() error { - // Send the set-coordinator message to all nodes. - err := h.Broadcaster.SendSync( + // If the new coordinator is this node, do the SetCoordinator directly. + if newNode.ID == h.Node.ID { + return h.Cluster.SetCoordinator(newNode) + } + + // Send the set-coordinator message to new node. + err := h.Broadcaster.SendTo( + newNode, &internal.SetCoordinatorMessage{ New: EncodeNode(newNode), }) @@ -2042,9 +2049,6 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r return fmt.Errorf("problem sending SetCoordinator message: %s", err) } - // Set Coordinator on local node. - _ = h.Cluster.SetCoordinator(newNode) - return nil }(); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) @@ -2053,6 +2057,7 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r // Encode response. if err := json.NewEncoder(w).Encode(setCoordinatorResponse{ + Old: oldNode, New: newNode, }); err != nil { h.logger().Printf("response encoding error: %s", err) diff --git a/internal/private.pb.go b/internal/private.pb.go index 37b109014..1b7f71ac4 100644 --- a/internal/private.pb.go +++ b/internal/private.pb.go @@ -44,6 +44,7 @@ ResizeSource ResizeInstructionComplete SetCoordinatorMessage + UpdateCoordinatorMessage Topology RecalculateCaches */ @@ -1144,6 +1145,22 @@ func (m *SetCoordinatorMessage) GetNew() *Node { return nil } +type UpdateCoordinatorMessage struct { + New *Node `protobuf:"bytes,1,opt,name=New" json:"New,omitempty"` +} + +func (m *UpdateCoordinatorMessage) Reset() { *m = UpdateCoordinatorMessage{} } +func (m *UpdateCoordinatorMessage) String() string { return proto.CompactTextString(m) } +func (*UpdateCoordinatorMessage) ProtoMessage() {} +func (*UpdateCoordinatorMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{35} } + +func (m *UpdateCoordinatorMessage) GetNew() *Node { + if m != nil { + return m.New + } + return nil +} + type Topology struct { ClusterID string `protobuf:"bytes,1,opt,name=ClusterID,proto3" json:"ClusterID,omitempty"` NodeIDs []string `protobuf:"bytes,2,rep,name=NodeIDs" json:"NodeIDs,omitempty"` @@ -1152,7 +1169,7 @@ type Topology struct { func (m *Topology) Reset() { *m = Topology{} } func (m *Topology) String() string { return proto.CompactTextString(m) } func (*Topology) ProtoMessage() {} -func (*Topology) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{35} } +func (*Topology) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{36} } func (m *Topology) GetClusterID() string { if m != nil { @@ -1174,7 +1191,7 @@ type RecalculateCaches struct { func (m *RecalculateCaches) Reset() { *m = RecalculateCaches{} } func (m *RecalculateCaches) String() string { return proto.CompactTextString(m) } func (*RecalculateCaches) ProtoMessage() {} -func (*RecalculateCaches) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{36} } +func (*RecalculateCaches) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{37} } func init() { proto.RegisterType((*IndexMeta)(nil), "internal.IndexMeta") @@ -1212,6 +1229,7 @@ func init() { proto.RegisterType((*ResizeSource)(nil), "internal.ResizeSource") proto.RegisterType((*ResizeInstructionComplete)(nil), "internal.ResizeInstructionComplete") proto.RegisterType((*SetCoordinatorMessage)(nil), "internal.SetCoordinatorMessage") + proto.RegisterType((*UpdateCoordinatorMessage)(nil), "internal.UpdateCoordinatorMessage") proto.RegisterType((*Topology)(nil), "internal.Topology") proto.RegisterType((*RecalculateCaches)(nil), "internal.RecalculateCaches") } @@ -2641,6 +2659,34 @@ func (m *SetCoordinatorMessage) MarshalTo(dAtA []byte) (int, error) { return i, nil } +func (m *UpdateCoordinatorMessage) Marshal() (dAtA []byte, err error) { + size := m.Size() + dAtA = make([]byte, size) + n, err := m.MarshalTo(dAtA) + if err != nil { + return nil, err + } + return dAtA[:n], nil +} + +func (m *UpdateCoordinatorMessage) MarshalTo(dAtA []byte) (int, error) { + var i int + _ = i + var l int + _ = l + if m.New != nil { + dAtA[i] = 0xa + i++ + i = encodeVarintPrivate(dAtA, i, uint64(m.New.Size())) + n24, err := m.New.MarshalTo(dAtA[i:]) + if err != nil { + return 0, err + } + i += n24 + } + return i, nil +} + func (m *Topology) Marshal() (dAtA []byte, err error) { size := m.Size() dAtA = make([]byte, size) @@ -3355,6 +3401,16 @@ func (m *SetCoordinatorMessage) Size() (n int) { return n } +func (m *UpdateCoordinatorMessage) Size() (n int) { + var l int + _ = l + if m.New != nil { + l = m.New.Size() + n += 1 + l + sovPrivate(uint64(l)) + } + return n +} + func (m *Topology) Size() (n int) { var l int _ = l @@ -8262,6 +8318,89 @@ func (m *SetCoordinatorMessage) Unmarshal(dAtA []byte) error { } return nil } +func (m *UpdateCoordinatorMessage) Unmarshal(dAtA []byte) error { + l := len(dAtA) + iNdEx := 0 + for iNdEx < l { + preIndex := iNdEx + var wire uint64 + for shift := uint(0); ; shift += 7 { + if shift >= 64 { + return ErrIntOverflowPrivate + } + if iNdEx >= l { + return io.ErrUnexpectedEOF + } + b := dAtA[iNdEx] + iNdEx++ + wire |= (uint64(b) & 0x7F) << shift + if b < 0x80 { + break + } + } + fieldNum := int32(wire >> 3) + wireType := int(wire & 0x7) + if wireType == 4 { + return fmt.Errorf("proto: UpdateCoordinatorMessage: wiretype end group for non-group") + } + if fieldNum <= 0 { + return fmt.Errorf("proto: UpdateCoordinatorMessage: illegal tag %d (wire type %d)", fieldNum, wire) + } + switch fieldNum { + case 1: + if wireType != 2 { + return fmt.Errorf("proto: wrong wireType = %d for field New", wireType) + } + var msglen int + for shift := uint(0); ; shift += 7 { + if shift >= 64 { + return ErrIntOverflowPrivate + } + if iNdEx >= l { + return io.ErrUnexpectedEOF + } + b := dAtA[iNdEx] + iNdEx++ + msglen |= (int(b) & 0x7F) << shift + if b < 0x80 { + break + } + } + if msglen < 0 { + return ErrInvalidLengthPrivate + } + postIndex := iNdEx + msglen + if postIndex > l { + return io.ErrUnexpectedEOF + } + if m.New == nil { + m.New = &Node{} + } + if err := m.New.Unmarshal(dAtA[iNdEx:postIndex]); err != nil { + return err + } + iNdEx = postIndex + default: + iNdEx = preIndex + skippy, err := skipPrivate(dAtA[iNdEx:]) + if err != nil { + return err + } + if skippy < 0 { + return ErrInvalidLengthPrivate + } + if (iNdEx + skippy) > l { + return io.ErrUnexpectedEOF + } + iNdEx += skippy + } + } + + if iNdEx > l { + return io.ErrUnexpectedEOF + } + return nil +} func (m *Topology) Unmarshal(dAtA []byte) error { l := len(dAtA) iNdEx := 0 @@ -8528,88 +8667,89 @@ var ( func init() { proto.RegisterFile("private.proto", fileDescriptorPrivate) } var fileDescriptorPrivate = []byte{ - // 1325 bytes of a gzipped FileDescriptorProto - 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xac, 0x57, 0x4f, 0x6f, 0x1b, 0x45, - 0x14, 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0x34, 0xc4, 0xbf, 0x57, + 0xb4, 0x53, 0xf9, 0xf5, 0xa2, 0x66, 0xfd, 0x76, 0x51, 0xb3, 0x7e, 0xbf, 0xa8, 0x59, 0x3f, 0xfd, + 0x51, 0xfb, 0xdf, 0x51, 0x5e, 0xfe, 0xe5, 0x3f, 0xfc, 0x27, 0x00, 0x00, 0xff, 0xff, 0x66, 0x19, + 0x3d, 0xd2, 0xf6, 0x0f, 0x00, 0x00, } diff --git a/internal/private.proto b/internal/private.proto index 5755ce2f6..8642d9a13 100644 --- a/internal/private.proto +++ b/internal/private.proto @@ -207,6 +207,10 @@ message SetCoordinatorMessage { Node New = 1; } +message UpdateCoordinatorMessage { + Node New = 1; +} + message Topology { string ClusterID = 1; repeated string NodeIDs = 2; diff --git a/server.go b/server.go index c52c28cbd..531609278 100644 --- a/server.go +++ b/server.go @@ -456,6 +456,8 @@ func (s *Server) ReceiveMessage(pb proto.Message) error { } case *internal.SetCoordinatorMessage: s.Cluster.SetCoordinator(DecodeNode(obj.New)) + case *internal.UpdateCoordinatorMessage: + s.Cluster.UpdateCoordinator(DecodeNode(obj.New)) case *internal.NodeStateMessage: err := s.Cluster.ReceiveNodeState(obj.NodeID, obj.State) if err != nil {