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raft: fix readindex

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This commit is contained in:
Xiang Li 2016-07-19 14:19:13 -07:00
parent d3d954d659
commit 1c5754f02d
4 changed files with 25 additions and 8 deletions
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1
etcdserver/server_test.go
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@ -1359,6 +1359,7 @@ func (n *nodeRecorder) Step(ctx context.Context, msg raftpb.Message) error {
} }
func (n *nodeRecorder) Status() raft.Status { return raft.Status{} } func (n *nodeRecorder) Status() raft.Status { return raft.Status{} }
func (n *nodeRecorder) Ready() <-chan raft.Ready { return nil } func (n *nodeRecorder) Ready() <-chan raft.Ready { return nil }
func (n *nodeRecorder) ReadIndex(ctx context.Context, rctx []byte) error { return nil }
func (n *nodeRecorder) Advance() {} func (n *nodeRecorder) Advance() {}
func (n *nodeRecorder) ApplyConfChange(conf raftpb.ConfChange) *raftpb.ConfState { func (n *nodeRecorder) ApplyConfChange(conf raftpb.ConfChange) *raftpb.ConfState {
n.Record(testutil.Action{Name: "ApplyConfChange", Params: []interface{}{conf}}) n.Record(testutil.Action{Name: "ApplyConfChange", Params: []interface{}{conf}})

16
raft/node.go
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@ -157,6 +157,18 @@ type Node interface {
// in snapshots. Will never return nil; it returns a pointer only // in snapshots. Will never return nil; it returns a pointer only
// to match MemoryStorage.Compact. // to match MemoryStorage.Compact.
ApplyConfChange(cc pb.ConfChange) *pb.ConfState ApplyConfChange(cc pb.ConfChange) *pb.ConfState
// ReadIndex request a read state. The read state will be set in the ready.
// Read state has a read index. Once the application advances further than the read
// index, any linearizable read requests issued before the read request can be
// processed safely. The read state will have the same rctx attached.
//
// Note: the current implementation depends on the leader lease. If the clock drift is unbounded,
// leader might keep the lease longer than it should (clock can move backward/pause without any bound).
// ReadIndex is not safe in that case.
// TODO: add clock drift bound into raft configuration.
ReadIndex(ctx context.Context, rctx []byte) error
// Status returns the current status of the raft state machine. // Status returns the current status of the raft state machine.
Status() Status Status() Status
// ReportUnreachable reports the given node is not reachable for the last send. // ReportUnreachable reports the given node is not reachable for the last send.
@ -487,8 +499,8 @@ func (n *node) ReportSnapshot(id uint64, status SnapshotStatus) {
} }
} }
func (n *node) ReadIndex(ctx context.Context, id uint64, rctx []byte) error { func (n *node) ReadIndex(ctx context.Context, rctx []byte) error {
return n.step(ctx, pb.Message{Type: pb.MsgReadIndex, From: id, Entries: []pb.Entry{{Data: rctx}}}) return n.step(ctx, pb.Message{Type: pb.MsgReadIndex, Entries: []pb.Entry{{Data: rctx}}})
} }
func newReady(r *raft, prevSoftSt *SoftState, prevHardSt pb.HardState) Ready { func newReady(r *raft, prevSoftSt *SoftState, prevHardSt pb.HardState) Ready {

2
raft/node_test.go
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@ -180,7 +180,7 @@ func TestNodeReadIndex(t *testing.T) {
r.step = appendStep r.step = appendStep
wrequestCtx = []byte("somedata2") wrequestCtx = []byte("somedata2")
n.ReadIndex(context.TODO(), r.id, wrequestCtx) n.ReadIndex(context.TODO(), wrequestCtx)
n.Stop() n.Stop()
if len(msgs) != 1 { if len(msgs) != 1 {

6
raft/raft.go
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@ -681,8 +681,12 @@ func stepLeader(r *raft, m pb.Message) {
if r.checkQuorum { if r.checkQuorum {
ri = r.raftLog.committed ri = r.raftLog.committed
} }
if m.From == None || m.From == r.id { // from local member
r.readState.Index = ri
r.readState.RequestCtx = m.Entries[0].Data
} else {
r.send(pb.Message{To: m.From, Type: pb.MsgReadIndexResp, Index: ri, Entries: m.Entries}) r.send(pb.Message{To: m.From, Type: pb.MsgReadIndexResp, Index: ri, Entries: m.Entries})
}
return return
} }