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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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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
// to match MemoryStorage.Compact.
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() Status
// 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 {
return n.step(ctx, pb.Message{Type: pb.MsgReadIndex, From: id, Entries: []pb.Entry{{Data: rctx}}})
func (n *node) ReadIndex(ctx context.Context, rctx []byte) error {
return n.step(ctx, pb.Message{Type: pb.MsgReadIndex, Entries: []pb.Entry{{Data: rctx}}})
}
func newReady(r *raft, prevSoftSt *SoftState, prevHardSt pb.HardState) Ready {