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raft: support safe readonly request

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Implement raft readonly request described in raft thesis 6.4
along with the existing clock/lease based approach.
This commit is contained in:
Xiang Li
2016-08-26 16:03:06 -07:00
parent e53b99588a
commit 710b14ce56
6 changed files with 297 additions and 68 deletions
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17
raft/node_test.go
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@@ -150,24 +150,19 @@ func TestNodeReadIndex(t *testing.T) {
appendStep := func(r *raft, m raftpb.Message) {
msgs = append(msgs, m)
}
wreadIndex := uint64(1)
wrequestCtx := []byte("somedata")
wrs := []ReadState{{Index: uint64(1), RequestCtx: []byte("somedata")}}
n := newNode()
s := NewMemoryStorage()
r := newTestRaft(1, []uint64{1}, 10, 1, s)
r.readState.Index = wreadIndex
r.readState.RequestCtx = wrequestCtx
r.readStates = wrs
go n.run(r)
n.Campaign(context.TODO())
for {
rd := <-n.Ready()
if rd.Index != wreadIndex {
t.Errorf("ReadIndex = %d, want %d", rd.Index, wreadIndex)
}
if !bytes.Equal(rd.RequestCtx, wrequestCtx) {
t.Errorf("RequestCtx = %v, want %v", rd.RequestCtx, wrequestCtx)
if !reflect.DeepEqual(rd.ReadStates, wrs) {
t.Errorf("ReadStates = %v, want %v", rd.ReadStates, wrs)
}
s.Append(rd.Entries)
@@ -180,7 +175,7 @@ func TestNodeReadIndex(t *testing.T) {
}
r.step = appendStep
wrequestCtx = []byte("somedata2")
wrequestCtx := []byte("somedata2")
n.ReadIndex(context.TODO(), wrequestCtx)
n.Stop()