func TestRaftQuorumRecovery(t *testing.T) {
t.Parallel()
// Bring up a 5 nodes cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
defer raftutils.TeardownCluster(t, nodes)
// Lose a majority
for i := uint64(1); i <= 3; i++ {
nodes[i].Server.Stop()
nodes[i].Shutdown()
}
raftutils.AdvanceTicks(clockSource, 5)
// Restore the majority by restarting node 3
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
delete(nodes, 1)
delete(nodes, 2)
raftutils.WaitForCluster(t, clockSource, nodes)
// Propose a value
value, err := raftutils.ProposeValue(t, raftutils.Leader(nodes))
assert.NoError(t, err)
for _, node := range nodes {
raftutils.CheckValue(t, clockSource, node, value)
}
}
func testRaftRestartCluster(t *testing.T, stagger bool) {
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Propose a value
values := make([]*api.Node, 2)
var err error
values[0], err = raftutils.ProposeValue(t, nodes[1], "id1")
assert.NoError(t, err, "failed to propose value")
// Stop all nodes
for _, node := range nodes {
node.Server.Stop()
node.Shutdown()
}
raftutils.AdvanceTicks(clockSource, 5)
// Restart all nodes
i := 0
for k, node := range nodes {
if stagger && i != 0 {
raftutils.AdvanceTicks(clockSource, 1)
}
nodes[k] = raftutils.RestartNode(t, clockSource, node, false)
i++
}
raftutils.WaitForCluster(t, clockSource, nodes)
// Propose another value
values[1], err = raftutils.ProposeValue(t, raftutils.Leader(nodes), "id2")
assert.NoError(t, err, "failed to propose value")
for _, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
var err error
node.MemoryStore().View(func(tx store.ReadTx) {
var allNodes []*api.Node
allNodes, err = store.FindNodes(tx, store.All)
if err != nil {
return
}
if len(allNodes) != 2 {
err = fmt.Errorf("expected 2 nodes, got %d", len(allNodes))
return
}
for i, nodeID := range []string{"id1", "id2"} {
n := store.GetNode(tx, nodeID)
if !reflect.DeepEqual(n, values[i]) {
err = fmt.Errorf("node %s did not match expected value", nodeID)
return
}
}
})
return err
}))
}
}
func TestRaftBootstrap(t *testing.T) {
t.Parallel()
nodes, _ := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
assert.Equal(t, 3, len(nodes[1].GetMemberlist()))
assert.Equal(t, 3, len(nodes[2].GetMemberlist()))
assert.Equal(t, 3, len(nodes[3].GetMemberlist()))
}
// This test rotates the encryption key and restarts the node - the intent is try to trigger
// race conditions if there is more than one node and hence consensus may take longer.
func TestRaftEncryptionKeyRotationStress(t *testing.T) {
t.Parallel()
// Bring up a 3 nodes cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
leader := nodes[1]
// constantly propose values
done, stop, restart, clusterReady := make(chan struct{}), make(chan struct{}), make(chan struct{}), make(chan struct{})
go func() {
counter := len(nodes)
for {
select {
case <-stop:
close(done)
return
case <-restart:
// the node restarts may trigger a leadership change, so wait until the cluster has 3
// nodes again and a leader is selected before proposing more values
<-clusterReady
leader = raftutils.Leader(nodes)
default:
counter += 1
raftutils.ProposeValue(t, leader, DefaultProposalTime, fmt.Sprintf("id%d", counter))
}
}
}()
for i := 0; i < 30; i++ {
// rotate the encryption key
nodes[3].KeyRotator.QueuePendingKey([]byte(fmt.Sprintf("newKey%d", i)))
nodes[3].KeyRotator.RotationNotify() <- struct{}{}
require.NoError(t, raftutils.PollFunc(clockSource, func() error {
if nodes[3].KeyRotator.GetKeys().PendingDEK == nil {
return nil
}
return fmt.Errorf("not done rotating yet")
}))
// restart the node and wait for everything to settle and a leader to be elected
nodes[3].Server.Stop()
nodes[3].ShutdownRaft()
restart <- struct{}{}
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.AdvanceTicks(clockSource, 1)
raftutils.WaitForCluster(t, clockSource, nodes)
clusterReady <- struct{}{}
}
close(stop)
<-done
}
func TestCanRemoveMember(t *testing.T) {
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Stop node 2 and node 3 (2 nodes out of 3)
nodes[2].Server.Stop()
nodes[2].Shutdown()
nodes[3].Server.Stop()
nodes[3].Shutdown()
// Node 2 and Node 3 should be listed as Unreachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[2].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 2 to be unreachable")
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 3 to be unreachable")
}
return nil
}))
// Removing node 3 should fail
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
err := nodes[1].RemoveMember(ctx, 3)
assert.Error(t, err)
assert.Equal(t, err, raft.ErrCannotRemoveMember)
members := nodes[1].GetMemberlist()
assert.Equal(t, len(members), 3)
// Restart node 2 and node 3
nodes[2] = raftutils.RestartNode(t, clockSource, nodes[2], false)
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Removing node 3 should succeed
ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
err = nodes[1].RemoveMember(ctx, nodes[3].Config.ID)
assert.NoError(t, err)
members = nodes[1].GetMemberlist()
assert.Nil(t, members[nodes[3].Config.ID])
assert.Equal(t, len(members), 2)
// Removing node 2 should fail
ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
err = nodes[1].RemoveMember(ctx, nodes[2].Config.ID)
assert.Error(t, err)
assert.Equal(t, err, raft.ErrCannotRemoveMember)
assert.Equal(t, len(members), 2)
}
func TestRaftLeaderDown(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Stop node 1
nodes[1].Stop()
newCluster := map[uint64]*raftutils.TestNode{
2: nodes[2],
3: nodes[3],
}
// Wait for the re-election to occur
raftutils.WaitForCluster(t, clockSource, newCluster)
// Leader should not be 1
assert.NotEqual(t, nodes[2].Leader(), nodes[1].Config.ID)
// Ensure that node 2 and node 3 have the same leader
assert.Equal(t, nodes[3].Leader(), nodes[2].Leader())
// Find the leader node and a follower node
var (
leaderNode *raftutils.TestNode
followerNode *raftutils.TestNode
)
for i, n := range newCluster {
if n.Config.ID == n.Leader() {
leaderNode = n
if i == 2 {
followerNode = newCluster[3]
} else {
followerNode = newCluster[2]
}
}
}
require.NotNil(t, leaderNode)
require.NotNil(t, followerNode)
// Propose a value
value, err := raftutils.ProposeValue(t, leaderNode)
assert.NoError(t, err, "failed to propose value")
// The value should be replicated on all remaining nodes
raftutils.CheckValue(t, clockSource, leaderNode, value)
assert.Equal(t, len(leaderNode.GetMemberlist()), 3)
raftutils.CheckValue(t, clockSource, followerNode, value)
assert.Equal(t, len(followerNode.GetMemberlist()), 3)
}
func TestRaftLeader(t *testing.T) {
t.Parallel()
nodes, _ := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
assert.True(t, nodes[1].IsLeader(), "error: node 1 is not the Leader")
// nodes should all have the same leader
assert.Equal(t, nodes[1].Leader(), nodes[1].Config.ID)
assert.Equal(t, nodes[2].Leader(), nodes[1].Config.ID)
assert.Equal(t, nodes[3].Leader(), nodes[1].Config.ID)
}
func TestRaftLogReplication(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Propose a value
value, err := raftutils.ProposeValue(t, nodes[1])
assert.NoError(t, err, "failed to propose value")
// All nodes should have the value in the physical store
raftutils.CheckValue(t, clockSource, nodes[1], value)
raftutils.CheckValue(t, clockSource, nodes[2], value)
raftutils.CheckValue(t, clockSource, nodes[3], value)
}
func TestRaftLogReplicationWithoutLeader(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Stop the leader
nodes[1].Stop()
// Propose a value
_, err := raftutils.ProposeValue(t, nodes[2])
assert.Error(t, err)
// No value should be replicated in the store in the absence of the leader
raftutils.CheckNoValue(t, clockSource, nodes[2])
raftutils.CheckNoValue(t, clockSource, nodes[3])
}
func TestRaftFollowerLeave(t *testing.T) {
t.Parallel()
// Bring up a 5 nodes cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
defer raftutils.TeardownCluster(t, nodes)
// Node 5 leaves the cluster
// Use gRPC instead of calling handler directly because of
// authorization check.
cc, err := dial(nodes[1], nodes[1].Address)
assert.NoError(t, err)
raftClient := api.NewRaftMembershipClient(cc)
defer cc.Close()
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
resp, err := raftClient.Leave(ctx, &api.LeaveRequest{Node: &api.RaftMember{RaftID: nodes[5].Config.ID}})
assert.NoError(t, err, "error sending message to leave the raft")
assert.NotNil(t, resp, "leave response message is nil")
raftutils.ShutdownNode(nodes[5])
delete(nodes, 5)
raftutils.WaitForPeerNumber(t, clockSource, nodes, 4)
// Propose a value
value, err := raftutils.ProposeValue(t, nodes[1], DefaultProposalTime)
assert.NoError(t, err, "failed to propose value")
// Value should be replicated on every node
raftutils.CheckValue(t, clockSource, nodes[1], value)
assert.Len(t, nodes[1].GetMemberlist(), 4)
raftutils.CheckValue(t, clockSource, nodes[2], value)
assert.Len(t, nodes[2].GetMemberlist(), 4)
raftutils.CheckValue(t, clockSource, nodes[3], value)
assert.Len(t, nodes[3].GetMemberlist(), 4)
raftutils.CheckValue(t, clockSource, nodes[4], value)
assert.Len(t, nodes[4].GetMemberlist(), 4)
}
func TestRaftJoinTwice(t *testing.T) {
t.Parallel()
nodes, _ := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Node 3 tries to join again
// Use gRPC instead of calling handler directly because of
// authorization check.
cc, err := dial(nodes[3], nodes[1].Address)
assert.NoError(t, err)
raftClient := api.NewRaftMembershipClient(cc)
defer cc.Close()
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
_, err = raftClient.Join(ctx, &api.JoinRequest{})
assert.Error(t, err, "expected error on duplicate Join")
assert.Equal(t, grpc.Code(err), codes.AlreadyExists)
assert.Equal(t, grpc.ErrorDesc(err), "a raft member with this node ID already exists")
}
func TestRaftWipedState(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Stop node 3
nodes[3].Server.Stop()
nodes[3].ShutdownRaft()
// Remove its state
os.RemoveAll(nodes[3].StateDir)
raftutils.AdvanceTicks(clockSource, 5)
// Restart node 3
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
// Make sure this doesn't panic.
raftutils.PollFuncWithTimeout(clockSource, func() error { return errors.New("keep the poll going") }, time.Second)
}
func TestRaftNewNodeGetsData(t *testing.T) {
t.Parallel()
// Bring up a 3 node cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Propose a value
value, err := raftutils.ProposeValue(t, nodes[1])
assert.NoError(t, err, "failed to propose value")
// Add a new node
raftutils.AddRaftNode(t, clockSource, nodes, tc)
time.Sleep(500 * time.Millisecond)
// Value should be replicated on every node
for _, node := range nodes {
raftutils.CheckValue(t, clockSource, node, value)
assert.Equal(t, len(node.GetMemberlist()), 4)
}
}
func TestRaftQuorumFailure(t *testing.T) {
t.Parallel()
// Bring up a 5 nodes cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
defer raftutils.TeardownCluster(t, nodes)
// Lose a majority
for i := uint64(3); i <= 5; i++ {
nodes[i].Server.Stop()
nodes[i].Stop()
}
// Propose a value
_, err := raftutils.ProposeValue(t, nodes[1])
assert.Error(t, err)
// The value should not be replicated, we have no majority
raftutils.CheckNoValue(t, clockSource, nodes[2])
raftutils.CheckNoValue(t, clockSource, nodes[1])
}
func TestRaftFollowerDown(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Stop node 3
nodes[3].Stop()
// Leader should still be 1
assert.True(t, nodes[1].IsLeader(), "node 1 is not a leader anymore")
assert.Equal(t, nodes[2].Leader(), nodes[1].Config.ID)
// Propose a value
value, err := raftutils.ProposeValue(t, nodes[1])
assert.NoError(t, err, "failed to propose value")
// The value should be replicated on all remaining nodes
raftutils.CheckValue(t, clockSource, nodes[1], value)
assert.Equal(t, len(nodes[1].GetMemberlist()), 3)
raftutils.CheckValue(t, clockSource, nodes[2], value)
assert.Equal(t, len(nodes[2].GetMemberlist()), 3)
}
func TestRaftRejoin(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
ids := []string{"id1", "id2"}
// Propose a value
values := make([]*api.Node, 2)
var err error
values[0], err = raftutils.ProposeValue(t, nodes[1], ids[0])
assert.NoError(t, err, "failed to propose value")
// The value should be replicated on node 3
raftutils.CheckValue(t, clockSource, nodes[3], values[0])
assert.Equal(t, len(nodes[3].GetMemberlist()), 3)
// Stop node 3
nodes[3].Server.Stop()
nodes[3].Shutdown()
// Propose another value
values[1], err = raftutils.ProposeValue(t, nodes[1], ids[1])
assert.NoError(t, err, "failed to propose value")
// Nodes 1 and 2 should have the new value
raftutils.CheckValuesOnNodes(t, clockSource, map[uint64]*raftutils.TestNode{1: nodes[1], 2: nodes[2]}, ids, values)
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Node 3 should have all values, including the one proposed while
// it was unavailable.
raftutils.CheckValuesOnNodes(t, clockSource, nodes, ids, values)
}
func TestRaftForceNewCluster(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
// Propose a value
values := make([]*api.Node, 2)
var err error
values[0], err = raftutils.ProposeValue(t, nodes[1], "id1")
assert.NoError(t, err, "failed to propose value")
// The memberlist should contain 3 members on each node
for i := 1; i <= 3; i++ {
assert.Equal(t, len(nodes[uint64(i)].GetMemberlist()), 3)
}
// Stop all nodes
for _, node := range nodes {
node.Server.Stop()
node.Shutdown()
}
raftutils.AdvanceTicks(clockSource, 5)
toClean := map[uint64]*raftutils.TestNode{
2: nodes[2],
3: nodes[3],
}
raftutils.TeardownCluster(t, toClean)
delete(nodes, 2)
delete(nodes, 3)
// Only restart the first node with force-new-cluster option
nodes[1] = raftutils.RestartNode(t, clockSource, nodes[1], true)
raftutils.WaitForCluster(t, clockSource, nodes)
// The memberlist should contain only one node (self)
assert.Equal(t, len(nodes[1].GetMemberlist()), 1)
// Add 2 more members
nodes[2] = raftutils.NewJoinNode(t, clockSource, nodes[1].Address, tc)
raftutils.WaitForCluster(t, clockSource, nodes)
nodes[3] = raftutils.NewJoinNode(t, clockSource, nodes[1].Address, tc)
raftutils.WaitForCluster(t, clockSource, nodes)
newCluster := map[uint64]*raftutils.TestNode{
1: nodes[1],
2: nodes[2],
3: nodes[3],
}
defer raftutils.TeardownCluster(t, newCluster)
// The memberlist should contain 3 members on each node
for i := 1; i <= 3; i++ {
assert.Equal(t, len(nodes[uint64(i)].GetMemberlist()), 3)
}
// Propose another value
values[1], err = raftutils.ProposeValue(t, raftutils.Leader(nodes), "id2")
assert.NoError(t, err, "failed to propose value")
for _, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
var err error
node.MemoryStore().View(func(tx store.ReadTx) {
var allNodes []*api.Node
allNodes, err = store.FindNodes(tx, store.All)
if err != nil {
return
}
if len(allNodes) != 2 {
err = fmt.Errorf("expected 2 nodes, got %d", len(allNodes))
return
}
for i, nodeID := range []string{"id1", "id2"} {
n := store.GetNode(tx, nodeID)
if !reflect.DeepEqual(n, values[i]) {
err = fmt.Errorf("node %s did not match expected value", nodeID)
return
}
}
})
return err
}))
}
}
func TestListManagerNodes(t *testing.T) {
t.Parallel()
tc := cautils.NewTestCA(nil)
defer tc.Stop()
ts := newTestServer(t)
defer ts.Stop()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Create a node object for each of the managers
assert.NoError(t, nodes[1].MemoryStore().Update(func(tx store.Tx) error {
assert.NoError(t, store.CreateNode(tx, &api.Node{ID: nodes[1].SecurityConfig.ClientTLSCreds.NodeID()}))
assert.NoError(t, store.CreateNode(tx, &api.Node{ID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID()}))
assert.NoError(t, store.CreateNode(tx, &api.Node{ID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID()}))
return nil
}))
// Assign one of the raft node to the test server
ts.Server.raft = nodes[1].Node
ts.Server.store = nodes[1].MemoryStore()
// There should be 3 reachable managers listed
r, err := ts.Client.ListNodes(context.Background(), &api.ListNodesRequest{})
assert.NoError(t, err)
assert.NotNil(t, r)
managers := getMap(t, r.Nodes)
assert.Len(t, ts.Server.raft.GetMemberlist(), 3)
assert.Len(t, r.Nodes, 3)
// Node 1 should be the leader
for i := 1; i <= 3; i++ {
if i == 1 {
assert.True(t, managers[nodes[uint64(i)].Config.ID].Leader)
continue
}
assert.False(t, managers[nodes[uint64(i)].Config.ID].Leader)
}
// All nodes should be reachable
for i := 1; i <= 3; i++ {
assert.Equal(t, api.RaftMemberStatus_REACHABLE, managers[nodes[uint64(i)].Config.ID].Reachability)
}
// Add two more nodes to the cluster
raftutils.AddRaftNode(t, clockSource, nodes, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
raftutils.WaitForCluster(t, clockSource, nodes)
// Add node entries for these
assert.NoError(t, nodes[1].MemoryStore().Update(func(tx store.Tx) error {
assert.NoError(t, store.CreateNode(tx, &api.Node{ID: nodes[4].SecurityConfig.ClientTLSCreds.NodeID()}))
assert.NoError(t, store.CreateNode(tx, &api.Node{ID: nodes[5].SecurityConfig.ClientTLSCreds.NodeID()}))
return nil
}))
// There should be 5 reachable managers listed
r, err = ts.Client.ListNodes(context.Background(), &api.ListNodesRequest{})
assert.NoError(t, err)
assert.NotNil(t, r)
managers = getMap(t, r.Nodes)
assert.Len(t, ts.Server.raft.GetMemberlist(), 5)
assert.Len(t, r.Nodes, 5)
for i := 1; i <= 5; i++ {
assert.Equal(t, api.RaftMemberStatus_REACHABLE, managers[nodes[uint64(i)].Config.ID].Reachability)
}
// Stops 2 nodes
nodes[4].Server.Stop()
nodes[4].ShutdownRaft()
nodes[5].Server.Stop()
nodes[5].ShutdownRaft()
// Node 4 and Node 5 should be listed as Unreachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
r, err = ts.Client.ListNodes(context.Background(), &api.ListNodesRequest{})
if err != nil {
return err
}
managers = getMap(t, r.Nodes)
if len(r.Nodes) != 5 {
return fmt.Errorf("expected 5 nodes, got %d", len(r.Nodes))
}
if managers[nodes[4].Config.ID].Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 4 to be unreachable")
}
if managers[nodes[5].Config.ID].Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 5 to be unreachable")
}
return nil
}))
// Restart the 2 nodes
nodes[4] = raftutils.RestartNode(t, clockSource, nodes[4], false)
nodes[5] = raftutils.RestartNode(t, clockSource, nodes[5], false)
raftutils.WaitForCluster(t, clockSource, nodes)
assert.Len(t, ts.Server.raft.GetMemberlist(), 5)
// All the nodes should be reachable again
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
r, err = ts.Client.ListNodes(context.Background(), &api.ListNodesRequest{})
if err != nil {
return err
}
managers = getMap(t, r.Nodes)
for i := 1; i <= 5; i++ {
if managers[nodes[uint64(i)].Config.ID].Reachability != api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("node %x is unreachable", nodes[uint64(i)].Config.ID)
}
}
return nil
}))
// Switch the raft node used by the server
ts.Server.raft = nodes[2].Node
// Stop node 1 (leader)
nodes[1].Server.Stop()
nodes[1].ShutdownRaft()
newCluster := map[uint64]*raftutils.TestNode{
2: nodes[2],
3: nodes[3],
4: nodes[4],
5: nodes[5],
}
// Wait for the re-election to occur
raftutils.WaitForCluster(t, clockSource, newCluster)
// Node 1 should not be the leader anymore
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
r, err = ts.Client.ListNodes(context.Background(), &api.ListNodesRequest{})
if err != nil {
return err
}
managers = getMap(t, r.Nodes)
if managers[nodes[1].Config.ID].Leader {
return fmt.Errorf("expected node 1 not to be the leader")
}
if managers[nodes[1].Config.ID].Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 1 to be unreachable")
}
return nil
}))
// Restart node 1
nodes[1].ShutdownRaft()
nodes[1] = raftutils.RestartNode(t, clockSource, nodes[1], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Ensure that node 1 is not the leader
assert.False(t, managers[nodes[uint64(1)].Config.ID].Leader)
// Check that another node got the leader status
var leader uint64
leaderCount := 0
for i := 1; i <= 5; i++ {
if managers[nodes[uint64(i)].Config.ID].Leader {
leader = nodes[uint64(i)].Config.ID
leaderCount++
}
}
// There should be only one leader after node 1 recovery and it
// should be different than node 1
assert.Equal(t, 1, leaderCount)
assert.NotEqual(t, leader, nodes[1].Config.ID)
}
func testUpdateNodeDemote(leader bool, t *testing.T) {
tc := cautils.NewTestCA(nil)
defer tc.Stop()
ts := newTestServer(t)
defer ts.Stop()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Assign one of the raft node to the test server
ts.Server.raft = nodes[1].Node
ts.Server.store = nodes[1].MemoryStore()
// Create a node object for each of the managers
assert.NoError(t, nodes[1].MemoryStore().Update(func(tx store.Tx) error {
assert.NoError(t, store.CreateNode(tx, &api.Node{
ID: nodes[1].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: api.NodeSpec{
Role: api.NodeRoleManager,
Membership: api.NodeMembershipAccepted,
},
}))
assert.NoError(t, store.CreateNode(tx, &api.Node{
ID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: api.NodeSpec{
Role: api.NodeRoleManager,
Membership: api.NodeMembershipAccepted,
},
}))
assert.NoError(t, store.CreateNode(tx, &api.Node{
ID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: api.NodeSpec{
Role: api.NodeRoleManager,
Membership: api.NodeMembershipAccepted,
},
}))
return nil
}))
// Stop Node 3 (1 node out of 3)
nodes[3].Server.Stop()
nodes[3].ShutdownRaft()
// Node 3 should be listed as Unreachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 3 to be unreachable")
}
return nil
}))
// Try to demote Node 2, this should fail because of the quorum safeguard
r, err := ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec := r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version := &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.Error(t, err)
assert.Equal(t, codes.FailedPrecondition, grpc.Code(err))
// Restart Node 3
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Node 3 should be listed as Reachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_UNREACHABLE {
return fmt.Errorf("expected node 3 to be reachable")
}
return nil
}))
// Try to demote Node 3, this should succeed
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.NoError(t, err)
newCluster := map[uint64]*raftutils.TestNode{
1: nodes[1],
2: nodes[2],
}
raftutils.WaitForCluster(t, clockSource, newCluster)
// Server should list 2 members
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 2 {
return fmt.Errorf("expected 2 nodes, got %d", len(members))
}
return nil
}))
var demoteNode, lastNode *raftutils.TestNode
if leader {
demoteNode = nodes[1]
lastNode = nodes[2]
} else {
demoteNode = nodes[2]
lastNode = nodes[1]
}
// Try to demote a Node and scale down to 1
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: demoteNode.SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: demoteNode.SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.NoError(t, err)
// Update the server
ts.Server.raft = lastNode.Node
ts.Server.store = lastNode.MemoryStore()
newCluster = map[uint64]*raftutils.TestNode{
1: lastNode,
}
raftutils.WaitForCluster(t, clockSource, newCluster)
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := lastNode.GetMemberlist()
if len(members) != 1 {
return fmt.Errorf("expected 1 node, got %d", len(members))
}
return nil
}))
// Make sure we can't demote the last manager.
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: lastNode.SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: lastNode.SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.Error(t, err)
assert.Equal(t, codes.FailedPrecondition, grpc.Code(err))
// Propose a change in the spec and check if the remaining node can still process updates
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: lastNode.SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Availability = api.NodeAvailabilityDrain
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: lastNode.SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.NoError(t, err)
// Get node information and check that the availability is set to drain
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: lastNode.SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
assert.Equal(t, r.Node.Spec.Availability, api.NodeAvailabilityDrain)
}
func TestRaftLeaderLeave(t *testing.T) {
t.Parallel()
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
// node 1 is the leader
assert.Equal(t, nodes[1].Leader(), nodes[1].Config.ID)
// Try to leave the raft
// Use gRPC instead of calling handler directly because of
// authorization check.
client, err := nodes[1].ConnectToMember(nodes[1].Address, 10*time.Second)
assert.NoError(t, err)
defer client.Conn.Close()
raftClient := api.NewRaftMembershipClient(client.Conn)
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
resp, err := raftClient.Leave(ctx, &api.LeaveRequest{Node: &api.RaftMember{RaftID: nodes[1].Config.ID}})
assert.NoError(t, err, "error sending message to leave the raft")
assert.NotNil(t, resp, "leave response message is nil")
newCluster := map[uint64]*raftutils.TestNode{
2: nodes[2],
3: nodes[3],
}
// Wait for election tick
raftutils.WaitForCluster(t, clockSource, newCluster)
// Leader should not be 1
assert.NotEqual(t, nodes[2].Leader(), nodes[1].Config.ID)
assert.Equal(t, nodes[2].Leader(), nodes[3].Leader())
leader := nodes[2].Leader()
// Find the leader node and a follower node
var (
leaderNode *raftutils.TestNode
followerNode *raftutils.TestNode
)
for i, n := range nodes {
if n.Config.ID == leader {
leaderNode = n
if i == 2 {
followerNode = nodes[3]
} else {
followerNode = nodes[2]
}
}
}
require.NotNil(t, leaderNode)
require.NotNil(t, followerNode)
// Propose a value
value, err := raftutils.ProposeValue(t, leaderNode)
assert.NoError(t, err, "failed to propose value")
// The value should be replicated on all remaining nodes
raftutils.CheckValue(t, clockSource, leaderNode, value)
assert.Equal(t, len(leaderNode.GetMemberlist()), 2)
raftutils.CheckValue(t, clockSource, followerNode, value)
assert.Equal(t, len(followerNode.GetMemberlist()), 2)
raftutils.TeardownCluster(t, newCluster)
}
func TestCanRemoveMember(t *testing.T) {
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Stop node 2 and node 3 (2 nodes out of 3)
nodes[2].Server.Stop()
nodes[2].Shutdown()
nodes[3].Server.Stop()
nodes[3].Shutdown()
// Node 2 and Node 3 should be listed as Unreachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[2].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 2 to be unreachable")
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 3 to be unreachable")
}
return nil
}))
// Removing all nodes should fail
for i := 1; i <= 3; i++ {
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
err := nodes[1].RemoveMember(ctx, uint64(i))
assert.Error(t, err)
assert.Equal(t, err, raft.ErrCannotRemoveMember)
members := nodes[1].GetMemberlist()
assert.Equal(t, len(members), 3)
}
// Restart node 2 and node 3
nodes[2] = raftutils.RestartNode(t, clockSource, nodes[2], false)
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Node 2 and Node 3 should be listed as Reachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[2].Config.ID].Status.Reachability == api.RaftMemberStatus_UNREACHABLE {
return fmt.Errorf("expected node 2 to be reachable")
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_UNREACHABLE {
return fmt.Errorf("expected node 3 to be reachable")
}
return nil
}))
// Stop Node 3 (1 node out of 3)
nodes[3].Server.Stop()
nodes[3].Shutdown()
// Node 3 should be listed as Unreachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 3 to be unreachable")
}
return nil
}))
// Removing node 2 should fail (this would break the quorum)
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
err := nodes[1].RemoveMember(ctx, nodes[2].Config.ID)
assert.Error(t, err)
assert.Equal(t, err, raft.ErrCannotRemoveMember)
members := nodes[1].GetMemberlist()
assert.Equal(t, len(members), 3)
// Removing node 3 works fine because it is already unreachable
ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
err = nodes[1].RemoveMember(ctx, nodes[3].Config.ID)
assert.NoError(t, err)
members = nodes[1].GetMemberlist()
assert.Nil(t, members[nodes[3].Config.ID])
assert.Equal(t, len(members), 2)
// Add back node 3
raftutils.ShutdownNode(nodes[3])
delete(nodes, 3)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
// Node 2 and Node 3 should be listed as Reachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[2].Config.ID].Status.Reachability != api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 2 to be reachable")
}
if members[nodes[3].Config.ID].Status.Reachability != api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 3 to be reachable")
}
return nil
}))
// Removing node 3 should succeed
ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
err = nodes[1].RemoveMember(ctx, nodes[3].Config.ID)
assert.NoError(t, err)
members = nodes[1].GetMemberlist()
assert.Nil(t, members[nodes[3].Config.ID])
assert.Equal(t, len(members), 2)
// Removing node 2 should succeed
ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
err = nodes[1].RemoveMember(ctx, nodes[2].Config.ID)
assert.NoError(t, err)
members = nodes[1].GetMemberlist()
assert.Nil(t, members[nodes[2].Config.ID])
assert.Equal(t, len(members), 1)
}
func TestRaftSnapshotRestart(t *testing.T) {
t.Parallel()
// Bring up a 3 node cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc, &api.RaftConfig{SnapshotInterval: 10, LogEntriesForSlowFollowers: 0})
defer raftutils.TeardownCluster(t, nodes)
nodeIDs := []string{"id1", "id2", "id3", "id4", "id5", "id6", "id7"}
values := make([]*api.Node, len(nodeIDs))
// Propose 3 values
var err error
for i, nodeID := range nodeIDs[:3] {
values[i], err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeID)
assert.NoError(t, err, "failed to propose value")
}
// Take down node 3
nodes[3].Server.Stop()
nodes[3].Shutdown()
// Propose a 4th value before the snapshot
values[3], err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeIDs[3])
assert.NoError(t, err, "failed to propose value")
// Remaining nodes shouldn't have snapshot files yet
for _, node := range []*raftutils.TestNode{nodes[1], nodes[2]} {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap"))
assert.NoError(t, err)
assert.Len(t, dirents, 0)
}
// Add a node to the cluster before the snapshot. This is the event
// that triggers the snapshot.
nodes[4] = raftutils.NewJoinNode(t, clockSource, nodes[1].Address, tc)
raftutils.WaitForCluster(t, clockSource, map[uint64]*raftutils.TestNode{1: nodes[1], 2: nodes[2], 4: nodes[4]})
// Remaining nodes should now have a snapshot file
for nodeIdx, node := range []*raftutils.TestNode{nodes[1], nodes[2]} {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d on node %d", len(dirents), nodeIdx+1)
}
return nil
}))
}
raftutils.CheckValuesOnNodes(t, clockSource, map[uint64]*raftutils.TestNode{1: nodes[1], 2: nodes[2]}, nodeIDs[:4], values[:4])
// Propose a 5th value
values[4], err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeIDs[4])
require.NoError(t, err)
// Add another node to the cluster
nodes[5] = raftutils.NewJoinNode(t, clockSource, nodes[1].Address, tc)
raftutils.WaitForCluster(t, clockSource, map[uint64]*raftutils.TestNode{1: nodes[1], 2: nodes[2], 4: nodes[4], 5: nodes[5]})
// New node should get a copy of the snapshot
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(nodes[5].StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d on new node", len(dirents))
}
return nil
}))
dirents, err := ioutil.ReadDir(filepath.Join(nodes[5].StateDir, "snap"))
assert.NoError(t, err)
assert.Len(t, dirents, 1)
raftutils.CheckValuesOnNodes(t, clockSource, map[uint64]*raftutils.TestNode{1: nodes[1], 2: nodes[2]}, nodeIDs[:5], values[:5])
// It should know about the other nodes, including the one that was just added
stripMembers := func(memberList map[uint64]*api.RaftMember) map[uint64]*api.RaftMember {
raftNodes := make(map[uint64]*api.RaftMember)
for k, v := range memberList {
raftNodes[k] = &api.RaftMember{
RaftID: v.RaftID,
Addr: v.Addr,
}
}
return raftNodes
}
assert.Equal(t, stripMembers(nodes[1].GetMemberlist()), stripMembers(nodes[4].GetMemberlist()))
// Restart node 3
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Node 3 should know about other nodes, including the new one
assert.Len(t, nodes[3].GetMemberlist(), 5)
assert.Equal(t, stripMembers(nodes[1].GetMemberlist()), stripMembers(nodes[3].GetMemberlist()))
// Propose yet another value, to make sure the rejoined node is still
// receiving new logs
values[5], err = raftutils.ProposeValue(t, raftutils.Leader(nodes), DefaultProposalTime, nodeIDs[5])
require.NoError(t, err)
// All nodes should have all the data
raftutils.CheckValuesOnNodes(t, clockSource, nodes, nodeIDs[:6], values[:6])
// Restart node 3 again. It should load the snapshot.
nodes[3].Server.Stop()
nodes[3].Shutdown()
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
assert.Len(t, nodes[3].GetMemberlist(), 5)
assert.Equal(t, stripMembers(nodes[1].GetMemberlist()), stripMembers(nodes[3].GetMemberlist()))
raftutils.CheckValuesOnNodes(t, clockSource, nodes, nodeIDs[:6], values[:6])
// Propose again. Just to check consensus after this latest restart.
values[6], err = raftutils.ProposeValue(t, raftutils.Leader(nodes), DefaultProposalTime, nodeIDs[6])
require.NoError(t, err)
raftutils.CheckValuesOnNodes(t, clockSource, nodes, nodeIDs, values)
}
func TestRaftSnapshot(t *testing.T) {
t.Parallel()
// Bring up a 3 node cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc, &api.RaftConfig{SnapshotInterval: 9, LogEntriesForSlowFollowers: 0})
defer raftutils.TeardownCluster(t, nodes)
nodeIDs := []string{"id1", "id2", "id3", "id4", "id5", "id6", "id7", "id8", "id9", "id10", "id11", "id12"}
values := make([]*api.Node, len(nodeIDs))
snapshotFilenames := make(map[uint64]string, 4)
// Propose 3 values
var err error
for i, nodeID := range nodeIDs[:3] {
values[i], err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeID)
assert.NoError(t, err, "failed to propose value")
}
// None of the nodes should have snapshot files yet
for _, node := range nodes {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap"))
assert.NoError(t, err)
assert.Len(t, dirents, 0)
}
// Check all nodes have all the data.
// This also acts as a synchronization point so that the next value we
// propose will arrive as a separate message to the raft state machine,
// and it is guaranteed to have the right cluster settings when
// deciding whether to create a new snapshot.
raftutils.CheckValuesOnNodes(t, clockSource, nodes, nodeIDs[:3], values)
// Propose a 4th value
values[3], err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeIDs[3])
assert.NoError(t, err, "failed to propose value")
// All nodes should now have a snapshot file
for nodeID, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d", len(dirents))
}
snapshotFilenames[nodeID] = dirents[0].Name()
return nil
}))
}
// Add a node to the cluster
raftutils.AddRaftNode(t, clockSource, nodes, tc)
// It should get a copy of the snapshot
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(nodes[4].StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d on new node", len(dirents))
}
snapshotFilenames[4] = dirents[0].Name()
return nil
}))
// It should know about the other nodes
stripMembers := func(memberList map[uint64]*api.RaftMember) map[uint64]*api.RaftMember {
raftNodes := make(map[uint64]*api.RaftMember)
for k, v := range memberList {
raftNodes[k] = &api.RaftMember{
RaftID: v.RaftID,
Addr: v.Addr,
}
}
return raftNodes
}
assert.Equal(t, stripMembers(nodes[1].GetMemberlist()), stripMembers(nodes[4].GetMemberlist()))
// All nodes should have all the data
raftutils.CheckValuesOnNodes(t, clockSource, nodes, nodeIDs[:4], values)
// Propose more values to provoke a second snapshot
for i := 4; i != len(nodeIDs); i++ {
values[i], err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeIDs[i])
assert.NoError(t, err, "failed to propose value")
}
// All nodes should have a snapshot under a *different* name
for nodeID, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d on node %d", len(dirents), nodeID)
}
if dirents[0].Name() == snapshotFilenames[nodeID] {
return fmt.Errorf("snapshot %s did not get replaced", snapshotFilenames[nodeID])
}
return nil
}))
}
// All nodes should have all the data
raftutils.CheckValuesOnNodes(t, clockSource, nodes, nodeIDs, values)
}
func TestUpdateNodeDemote(t *testing.T) {
tc := cautils.NewTestCA(nil, cautils.AcceptancePolicy(true, true, ""))
ts := newTestServer(t)
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
defer raftutils.TeardownCluster(t, nodes)
// Assign one of the raft node to the test server
ts.Server.raft = nodes[1].Node
ts.Server.store = nodes[1].MemoryStore()
// Create a node object for each of the managers
assert.NoError(t, nodes[1].MemoryStore().Update(func(tx store.Tx) error {
assert.NoError(t, store.CreateNode(tx, &api.Node{
ID: nodes[1].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: api.NodeSpec{
Role: api.NodeRoleManager,
Membership: api.NodeMembershipAccepted,
},
}))
assert.NoError(t, store.CreateNode(tx, &api.Node{
ID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: api.NodeSpec{
Role: api.NodeRoleManager,
Membership: api.NodeMembershipAccepted,
},
}))
assert.NoError(t, store.CreateNode(tx, &api.Node{
ID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: api.NodeSpec{
Role: api.NodeRoleManager,
Membership: api.NodeMembershipAccepted,
},
}))
return nil
}))
// Stop Node 3 (1 node out of 3)
nodes[3].Server.Stop()
nodes[3].Shutdown()
// Node 3 should be listed as Unreachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_REACHABLE {
return fmt.Errorf("expected node 3 to be unreachable")
}
return nil
}))
// Try to demote Node 2, this should fail because of the quorum safeguard
r, err := ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec := r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version := &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.Error(t, err)
assert.Equal(t, codes.FailedPrecondition, grpc.Code(err))
// Restart Node 3
nodes[3] = raftutils.RestartNode(t, clockSource, nodes[3], false)
raftutils.WaitForCluster(t, clockSource, nodes)
// Node 3 should be listed as Reachable
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 3 {
return fmt.Errorf("expected 3 nodes, got %d", len(members))
}
if members[nodes[3].Config.ID].Status.Reachability == api.RaftMemberStatus_UNREACHABLE {
return fmt.Errorf("expected node 3 to be reachable")
}
return nil
}))
// Try to demote Node 3, this should succeed
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: nodes[3].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.NoError(t, err)
newCluster := map[uint64]*raftutils.TestNode{
1: nodes[1],
2: nodes[2],
}
raftutils.WaitForCluster(t, clockSource, newCluster)
// Server should list 2 members
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 2 {
return fmt.Errorf("expected 2 nodes, got %d", len(members))
}
return nil
}))
// Try to demote Node 2
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: nodes[2].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.NoError(t, err)
newCluster = map[uint64]*raftutils.TestNode{
1: nodes[1],
}
raftutils.WaitForCluster(t, clockSource, newCluster)
// New server should list 1 member
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
members := nodes[1].GetMemberlist()
if len(members) != 1 {
return fmt.Errorf("expected 1 node, got %d", len(members))
}
return nil
}))
// Make sure we can't demote the last manager.
r, err = ts.Client.GetNode(context.Background(), &api.GetNodeRequest{NodeID: nodes[1].SecurityConfig.ClientTLSCreds.NodeID()})
assert.NoError(t, err)
spec = r.Node.Spec.Copy()
spec.Role = api.NodeRoleWorker
version = &r.Node.Meta.Version
_, err = ts.Client.UpdateNode(context.Background(), &api.UpdateNodeRequest{
NodeID: nodes[1].SecurityConfig.ClientTLSCreds.NodeID(),
Spec: spec,
NodeVersion: version,
})
assert.Error(t, err)
assert.Equal(t, codes.FailedPrecondition, grpc.Code(err))
}
func TestGCWAL(t *testing.T) {
t.Parallel()
// Additional log entries from cluster setup, leader election
extraLogEntries := 5
// Number of large entries to propose
proposals := 8
// Bring up a 3 node cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc, &api.RaftConfig{SnapshotInterval: uint64(proposals + extraLogEntries), LogEntriesForSlowFollowers: 0})
for i := 0; i != proposals; i++ {
_, err := proposeLargeValue(t, nodes[1], DefaultProposalTime, fmt.Sprintf("id%d", i))
assert.NoError(t, err, "failed to propose value")
}
time.Sleep(250 * time.Millisecond)
// Snapshot should have been triggered just as the WAL rotated, so
// both WAL files should be preserved
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(nodes[1].StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d", len(dirents))
}
dirents, err = ioutil.ReadDir(filepath.Join(nodes[1].StateDir, "wal"))
if err != nil {
return err
}
var walCount int
for _, f := range dirents {
if strings.HasSuffix(f.Name(), ".wal") {
walCount++
}
}
if walCount != 2 {
return fmt.Errorf("expected 2 WAL files, found %d", walCount)
}
return nil
}))
raftutils.TeardownCluster(t, nodes)
// Repeat this test, but trigger the snapshot after the WAL has rotated
proposals++
nodes, clockSource = raftutils.NewRaftCluster(t, tc, &api.RaftConfig{SnapshotInterval: uint64(proposals + extraLogEntries), LogEntriesForSlowFollowers: 0})
defer raftutils.TeardownCluster(t, nodes)
for i := 0; i != proposals; i++ {
_, err := proposeLargeValue(t, nodes[1], DefaultProposalTime, fmt.Sprintf("id%d", i))
assert.NoError(t, err, "failed to propose value")
}
time.Sleep(250 * time.Millisecond)
// This time only one WAL file should be saved.
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(nodes[1].StateDir, "snap"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d", len(dirents))
}
dirents, err = ioutil.ReadDir(filepath.Join(nodes[1].StateDir, "wal"))
if err != nil {
return err
}
var walCount int
for _, f := range dirents {
if strings.HasSuffix(f.Name(), ".wal") {
walCount++
}
}
if walCount != 1 {
return fmt.Errorf("expected 1 WAL file, found %d", walCount)
}
return nil
}))
// Restart the whole cluster
for _, node := range nodes {
node.Server.Stop()
node.Shutdown()
}
raftutils.AdvanceTicks(clockSource, 5)
i := 0
for k, node := range nodes {
nodes[k] = raftutils.RestartNode(t, clockSource, node, false)
i++
}
raftutils.WaitForCluster(t, clockSource, nodes)
// Is the data intact after restart?
for _, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
var err error
node.MemoryStore().View(func(tx store.ReadTx) {
var allNodes []*api.Node
allNodes, err = store.FindNodes(tx, store.All)
if err != nil {
return
}
if len(allNodes) != proposals {
err = fmt.Errorf("expected %d nodes, got %d", proposals, len(allNodes))
return
}
})
return err
}))
}
// It should still be possible to propose values
_, err := raftutils.ProposeValue(t, raftutils.Leader(nodes), DefaultProposalTime, "newnode")
assert.NoError(t, err, "failed to propose value")
for _, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
var err error
node.MemoryStore().View(func(tx store.ReadTx) {
var allNodes []*api.Node
allNodes, err = store.FindNodes(tx, store.All)
if err != nil {
return
}
if len(allNodes) != proposals+1 {
err = fmt.Errorf("expected %d nodes, got %d", proposals, len(allNodes))
return
}
})
return err
}))
}
}
func TestStress(t *testing.T) {
t.Parallel()
// Bring up a 5 nodes cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
raftutils.AddRaftNode(t, clockSource, nodes, tc)
defer raftutils.TeardownCluster(t, nodes)
// number of nodes that are running
nup := len(nodes)
// record of nodes that are down
idleNodes := map[int]struct{}{}
// record of ids that proposed successfully or time-out
pIDs := []string{}
leader := -1
for iters := 0; iters < 1000; iters++ {
// keep proposing new values and killing leader
for i := 1; i <= 5; i++ {
if nodes[uint64(i)] != nil {
id := strconv.Itoa(iters)
_, err := raftutils.ProposeValue(t, nodes[uint64(i)], id)
if err == nil {
pIDs = append(pIDs, id)
// if propose successfully, at least there are 3 running nodes
assert.True(t, nup >= 3)
// only leader can propose value
assert.True(t, leader == i || leader == -1)
// update leader
leader = i
break
} else if strings.Contains(err.Error(), "context deadline exceeded") {
// though it's timing out, we still record this value
// for it may be proposed successfully and stored in Raft some time later
pIDs = append(pIDs, id)
}
}
}
if rand.Intn(100) < 10 {
// increase clock to make potential election finish quickly
clockSource.Increment(200 * time.Millisecond)
time.Sleep(10 * time.Millisecond)
} else {
ms := rand.Intn(10)
clockSource.Increment(time.Duration(ms) * time.Millisecond)
}
if leader != -1 {
// if propose successfully, try to kill a node in random
s := rand.Intn(5) + 1
if _, ok := idleNodes[s]; !ok {
id := uint64(s)
nodes[id].Server.Stop()
nodes[id].Shutdown()
idleNodes[s] = struct{}{}
nup -= 1
if s == leader {
// leader is killed
leader = -1
}
}
}
if nup < 3 {
// if quorum is lost, try to bring back a node
s := rand.Intn(5) + 1
if _, ok := idleNodes[s]; ok {
id := uint64(s)
nodes[id] = raftutils.RestartNode(t, clockSource, nodes[id], false)
delete(idleNodes, s)
nup++
}
}
}
// bring back all nodes and propose the final value
for i := range idleNodes {
id := uint64(i)
nodes[id] = raftutils.RestartNode(t, clockSource, nodes[id], false)
}
raftutils.WaitForCluster(t, clockSource, nodes)
id := strconv.Itoa(1000)
val, err := raftutils.ProposeValue(t, raftutils.Leader(nodes), id)
assert.NoError(t, err, "failed to propose value")
pIDs = append(pIDs, id)
// increase clock to make cluster stable
time.Sleep(500 * time.Millisecond)
clockSource.Increment(500 * time.Millisecond)
ids, values := raftutils.GetAllValuesOnNode(t, clockSource, nodes[1])
// since cluster is stable, final value must be in the raft store
find := false
for _, value := range values {
if reflect.DeepEqual(value, val) {
find = true
break
}
}
assert.True(t, find)
// all nodes must have the same value
raftutils.CheckValuesOnNodes(t, clockSource, nodes, ids, values)
// ids should be a subset of pIDs
for _, id := range ids {
find = false
for _, pid := range pIDs {
if id == pid {
find = true
break
}
}
assert.True(t, find)
}
}
func TestRaftSnapshotForceNewCluster(t *testing.T) {
t.Parallel()
// Bring up a 3 node cluster
nodes, clockSource := raftutils.NewRaftCluster(t, tc, &api.RaftConfig{SnapshotInterval: 10, LogEntriesForSlowFollowers: 0})
defer raftutils.TeardownCluster(t, nodes)
nodeIDs := []string{"id1", "id2", "id3", "id4", "id5"}
// Propose 3 values.
for _, nodeID := range nodeIDs[:3] {
_, err := raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeID)
assert.NoError(t, err, "failed to propose value")
}
// Remove one of the original nodes
// Use gRPC instead of calling handler directly because of
// authorization check.
cc, err := dial(nodes[1], nodes[1].Address)
assert.NoError(t, err)
raftClient := api.NewRaftMembershipClient(cc)
defer cc.Close()
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
resp, err := raftClient.Leave(ctx, &api.LeaveRequest{Node: &api.RaftMember{RaftID: nodes[2].Config.ID}})
assert.NoError(t, err, "error sending message to leave the raft")
assert.NotNil(t, resp, "leave response message is nil")
raftutils.ShutdownNode(nodes[2])
delete(nodes, 2)
// Nodes shouldn't have snapshot files yet
for _, node := range nodes {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap-v3-encrypted"))
assert.NoError(t, err)
assert.Len(t, dirents, 0)
}
// Trigger a snapshot, with a 4th proposal
_, err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeIDs[3])
assert.NoError(t, err, "failed to propose value")
// Nodes should now have a snapshot file
for nodeIdx, node := range nodes {
assert.NoError(t, raftutils.PollFunc(clockSource, func() error {
dirents, err := ioutil.ReadDir(filepath.Join(node.StateDir, "snap-v3-encrypted"))
if err != nil {
return err
}
if len(dirents) != 1 {
return fmt.Errorf("expected 1 snapshot, found %d on node %d", len(dirents), nodeIdx+1)
}
return nil
}))
}
// Join another node
nodes[4] = raftutils.NewJoinNode(t, clockSource, nodes[1].Address, tc)
raftutils.WaitForCluster(t, clockSource, nodes)
// Only restart the first node with force-new-cluster option
nodes[1].Server.Stop()
nodes[1].ShutdownRaft()
nodes[1] = raftutils.RestartNode(t, clockSource, nodes[1], true)
delete(nodes, 3)
delete(nodes, 4)
raftutils.WaitForCluster(t, clockSource, nodes)
// The memberlist should contain exactly one node (self)
memberlist := nodes[1].GetMemberlist()
require.Len(t, memberlist, 1)
// Propose a 5th value
_, err = raftutils.ProposeValue(t, nodes[1], DefaultProposalTime, nodeIDs[4])
require.NoError(t, err)
}