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Merge pull request #6815 from bdarnell/transfer-non-member

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raft: Check promotable() in MsgTimeoutNow handling
This commit is contained in:
Xiang Li 2016-11-07 10:33:57 -08:00 committed by GitHub
commit c9cc1efb67
2 changed files with 24 additions and 5 deletions
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14
raft/raft.go
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@ -1050,11 +1050,15 @@ func stepFollower(r *raft, m pb.Message) {
m.To = r.lead
r.send(m)
case pb.MsgTimeoutNow:
r.logger.Infof("%x [term %d] received MsgTimeoutNow from %x and starts an election to get leadership.", r.id, r.Term, m.From)
// Leadership transfers never use pre-vote even if r.preVote is true; we
// know we are not recovering from a partition so there is no need for the
// extra round trip.
r.campaign(campaignTransfer)
if r.promotable() {
r.logger.Infof("%x [term %d] received MsgTimeoutNow from %x and starts an election to get leadership.", r.id, r.Term, m.From)
// Leadership transfers never use pre-vote even if r.preVote is true; we
// know we are not recovering from a partition so there is no need for the
// extra round trip.
r.campaign(campaignTransfer)
} else {
r.logger.Infof("%x received MsgTimeoutNow from %x but is not promotable", r.id, m.From)
}
case pb.MsgReadIndex:
if r.lead == None {
r.logger.Infof("%x no leader at term %d; dropping index reading msg", r.id, r.Term)

15
raft/raft_test.go
View File

@ -2835,6 +2835,21 @@ func checkLeaderTransferState(t *testing.T, r *raft, state StateType, lead uint6
}
}
// TestTransferNonMember verifies that when a MsgTimeoutNow arrives at
// a node that has been removed from the group, nothing happens.
// (previously, if the node also got votes, it would panic as it
// transitioned to StateLeader)
func TestTransferNonMember(t *testing.T) {
r := newTestRaft(1, []uint64{2, 3, 4}, 5, 1, NewMemoryStorage())
r.Step(pb.Message{From: 2, To: 1, Type: pb.MsgTimeoutNow})
r.Step(pb.Message{From: 2, To: 1, Type: pb.MsgVoteResp})
r.Step(pb.Message{From: 3, To: 1, Type: pb.MsgVoteResp})
if r.state != StateFollower {
t.Fatalf("state is %s, want StateFollower", r.state)
}
}
func ents(terms ...uint64) *raft {
storage := NewMemoryStorage()
for i, term := range terms {