[BUGFIX] Avoid returning empty data on startup of a non-leader server (#4554)
Ensure that DB is properly initialized when performing stale queries Addresses: - https://github.com/hashicorp/consul-replicate/issues/82 - https://github.com/hashicorp/consul/issues/3975 - https://github.com/hashicorp/consul-template/issues/1131
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@ -1467,11 +1467,18 @@ func TestCatalog_ListServices_Timeout(t *testing.T) {
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func TestCatalog_ListServices_Stale(t *testing.T) {
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t.Parallel()
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dir1, s1 := testServer(t)
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dir1, s1 := testServerWithConfig(t, func(c *Config) {
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c.ACLDatacenter = "dc1"
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})
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defer os.RemoveAll(dir1)
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defer s1.Shutdown()
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codec := rpcClient(t, s1)
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defer codec.Close()
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dir2, s2 := testServerWithConfig(t, func(c *Config) {
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c.ACLDatacenter = "dc1" // Enable ACLs!
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c.Bootstrap = false // Disable bootstrap
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})
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defer os.RemoveAll(dir2)
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defer s2.Shutdown()
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args := structs.DCSpecificRequest{
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Datacenter: "dc1",
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@ -1479,27 +1486,62 @@ func TestCatalog_ListServices_Stale(t *testing.T) {
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args.AllowStale = true
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var out structs.IndexedServices
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// Inject a fake service
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if err := s1.fsm.State().EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"}); err != nil {
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t.Fatalf("err: %v", err)
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}
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if err := s1.fsm.State().EnsureService(2, "foo", &structs.NodeService{ID: "db", Service: "db", Tags: []string{"primary"}, Address: "127.0.0.1", Port: 5000}); err != nil {
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// Inject a node
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if err := s1.fsm.State().EnsureNode(3, &structs.Node{Node: "foo", Address: "127.0.0.1"}); err != nil {
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t.Fatalf("err: %v", err)
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}
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// Run the query, do not wait for leader!
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codec := rpcClient(t, s2)
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defer codec.Close()
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// Run the query, do not wait for leader, never any contact with leader, should fail
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if err := msgpackrpc.CallWithCodec(codec, "Catalog.ListServices", &args, &out); err == nil || err.Error() != structs.ErrNoLeader.Error() {
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t.Fatalf("expected %v but got err: %v and %v", structs.ErrNoLeader, err, out)
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}
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// Try to join
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joinLAN(t, s2, s1)
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retry.Run(t, func(r *retry.R) { r.Check(wantRaft([]*Server{s1, s2})) })
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waitForLeader(s1, s2)
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testrpc.WaitForLeader(t, s2.RPC, "dc1")
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if err := msgpackrpc.CallWithCodec(codec, "Catalog.ListServices", &args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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// Should find the service
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// Should find the services
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if len(out.Services) != 1 {
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t.Fatalf("bad: %v", out)
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t.Fatalf("bad: %#v", out.Services)
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}
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if !out.KnownLeader {
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t.Fatalf("should have a leader: %v", out)
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}
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s1.Leave()
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s1.Shutdown()
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testrpc.WaitUntilNoLeader(t, s2.RPC, "dc1")
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args.AllowStale = false
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// Since the leader is now down, non-stale query should fail now
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if err := msgpackrpc.CallWithCodec(codec, "Catalog.ListServices", &args, &out); err == nil || err.Error() != structs.ErrNoLeader.Error() {
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t.Fatalf("expected %v but got err: %v and %v", structs.ErrNoLeader, err, out)
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}
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// With stale, request should still work
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args.AllowStale = true
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if err := msgpackrpc.CallWithCodec(codec, "Catalog.ListServices", &args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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// Should find old service
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if len(out.Services) != 1 {
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t.Fatalf("bad: %#v", out)
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}
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// Should not have a leader! Stale read
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if out.KnownLeader {
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t.Fatalf("bad: %v", out)
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t.Fatalf("should not have a leader anymore: %#v", out)
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}
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}
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@ -204,8 +204,8 @@ func (s *Server) forward(method string, info structs.RPCInfo, args interface{},
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return true, err
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}
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// Check if we can allow a stale read
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if info.IsRead() && info.AllowStaleRead() {
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// Check if we can allow a stale read, ensure our local DB is initialized
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if info.IsRead() && info.AllowStaleRead() && !s.raft.LastContact().IsZero() {
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return false, nil
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}
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@ -48,6 +48,48 @@ func TestRPC_NoLeader_Fail(t *testing.T) {
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}
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}
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func TestRPC_NoLeader_Fail_on_stale_read(t *testing.T) {
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t.Parallel()
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dir1, s1 := testServerWithConfig(t, func(c *Config) {
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c.RPCHoldTimeout = 1 * time.Millisecond
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})
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defer os.RemoveAll(dir1)
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defer s1.Shutdown()
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codec := rpcClient(t, s1)
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defer codec.Close()
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arg := structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "foo",
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Address: "127.0.0.1",
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}
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var out struct{}
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// Make sure we eventually fail with a no leader error, which we should
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// see given the short timeout.
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err := msgpackrpc.CallWithCodec(codec, "Catalog.Register", &arg, &out)
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if err == nil || err.Error() != structs.ErrNoLeader.Error() {
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t.Fatalf("bad: %v", err)
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}
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// Until leader has never been known, stale should fail
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getKeysReq := structs.KeyListRequest{
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Datacenter: "dc1",
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Prefix: "",
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Seperator: "/",
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QueryOptions: structs.QueryOptions{AllowStale: true},
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}
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var keyList structs.IndexedKeyList
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if err := msgpackrpc.CallWithCodec(codec, "KVS.ListKeys", &getKeysReq, &keyList); err.Error() != structs.ErrNoLeader.Error() {
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t.Fatalf("expected %v but got err: %v", structs.ErrNoLeader, err)
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}
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testrpc.WaitForLeader(t, s1.RPC, "dc1")
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if err := msgpackrpc.CallWithCodec(codec, "KVS.ListKeys", &getKeysReq, &keyList); err != nil {
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t.Fatalf("Did not expect any error but got err: %v", err)
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}
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}
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func TestRPC_NoLeader_Retry(t *testing.T) {
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t.Parallel()
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dir1, s1 := testServerWithConfig(t, func(c *Config) {
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@ -26,6 +26,20 @@ func WaitForLeader(t *testing.T, rpc rpcFn, dc string) {
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})
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}
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// WaitUntilNoLeader ensures no leader is present, useful for testing lost leadership.
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func WaitUntilNoLeader(t *testing.T, rpc rpcFn, dc string) {
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var out structs.IndexedNodes
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retry.Run(t, func(r *retry.R) {
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args := &structs.DCSpecificRequest{Datacenter: dc}
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if err := rpc("Catalog.ListNodes", args, &out); err == nil {
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r.Fatalf("It still has a leader: %#q", out)
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}
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if out.QueryMeta.KnownLeader {
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r.Fatalf("Has still a leader")
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}
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})
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}
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// WaitForTestAgent ensures we have a node with serfHealth check registered
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func WaitForTestAgent(t *testing.T, rpc rpcFn, dc string) {
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var nodes structs.IndexedNodes
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