diff --git a/conn/raft_server.go b/conn/raft_server.go
index 73e4ab212ce..cb54a27ae97 100644
--- a/conn/raft_server.go
+++ b/conn/raft_server.go
@@ -78,6 +78,13 @@ func (p *proposals) Store(key string, pctx *ProposalCtx) bool {
 	return true
 }
 
+func (p *proposals) Ctx(key string) context.Context {
+	if pctx := p.Get(key); pctx != nil {
+		return pctx.Ctx
+	}
+	return context.Background()
+}
+
 func (p *proposals) Get(key string) *ProposalCtx {
 	p.RLock()
 	defer p.RUnlock()
diff --git a/contrib/blockade/main.go b/contrib/blockade/main.go
index 937fe038cdc..242efd870ee 100644
--- a/contrib/blockade/main.go
+++ b/contrib/blockade/main.go
@@ -105,7 +105,10 @@ func testCommon(remove, join string, minAlphasUp int) error {
 		if err := increment(minAlphasUp); err != nil {
 			return err
 		}
-		// Then join.
+		// Then join, if available.
+		if len(join) == 0 {
+			continue
+		}
 		if err := run(ctxb, join); err != nil {
 			return err
 		}
@@ -155,10 +158,16 @@ func runTests() error {
 	fmt.Println("===> Slow TEST: OK")
 
 	if err := testCommon("blockade stop", "blockade start --all", 2); err != nil {
-		fmt.Printf("Error testRestart: %v\n", err)
+		fmt.Printf("Error testRestart with stop: %v\n", err)
+		return err
+	}
+	fmt.Println("===> Restart TEST1: OK")
+
+	if err := testCommon("blockade restart", "", 3); err != nil {
+		fmt.Printf("Error testRestart with restart: %v\n", err)
 		return err
 	}
-	fmt.Println("===> Restart TEST: OK")
+	fmt.Println("===> Restart TEST2: OK")
 
 	if err := testCommon("blockade partition", "blockade join", 2); err != nil {
 		fmt.Printf("Error testPartitions: %v\n", err)
diff --git a/dgraph/cmd/zero/oracle.go b/dgraph/cmd/zero/oracle.go
index 17e738f517b..64028cbb924 100644
--- a/dgraph/cmd/zero/oracle.go
+++ b/dgraph/cmd/zero/oracle.go
@@ -86,10 +86,6 @@ func (o *Oracle) purgeBelow(minTs uint64) {
 	o.Lock()
 	defer o.Unlock()
 
-	// TODO: HACK. Remove this later.
-	glog.Infof("Not purging below: %d", minTs)
-	return
-
 	// Dropping would be cheaper if abort/commits map is sharded
 	for ts := range o.commits {
 		if ts < minTs {
@@ -203,7 +199,9 @@ func (o *Oracle) sendDeltasToSubscribers() {
 			// Don't goto slurp_loop, because it would break from select immediately.
 		}
 
-		glog.V(2).Infof("DoneUntil: %d. Sending delta: %+v\n", o.doneUntil.DoneUntil(), delta)
+		if glog.V(3) {
+			glog.Infof("DoneUntil: %d. Sending delta: %+v\n", o.doneUntil.DoneUntil(), delta)
+		}
 		o.Lock()
 		for id, ch := range o.subscribers {
 			select {
@@ -446,40 +444,6 @@ func (s *Server) SyncedUntil() uint64 {
 	return syncUntil
 }
 
-func (s *Server) purgeOracle() {
-	ticker := time.NewTicker(time.Second * 30)
-	defer ticker.Stop()
-
-	var lastPurgeTs uint64
-OUTER:
-	for {
-		<-ticker.C
-		groups := s.KnownGroups()
-		var minTs uint64
-		for _, group := range groups {
-			pl := s.Leader(group)
-			if pl == nil {
-				glog.Errorf("No healthy connection found to leader of group %d\n", group)
-				goto OUTER
-			}
-			c := pb.NewWorkerClient(pl.Get())
-			num, err := c.PurgeTs(context.Background(), &api.Payload{})
-			if err != nil {
-				glog.Errorf("Error while fetching minTs from group %d, err: %v\n", group, err)
-				goto OUTER
-			}
-			if minTs == 0 || num.Val < minTs {
-				minTs = num.Val
-			}
-		}
-
-		if minTs > 0 && minTs != lastPurgeTs {
-			s.orc.purgeBelow(minTs)
-			lastPurgeTs = minTs
-		}
-	}
-}
-
 func (s *Server) TryAbort(ctx context.Context,
 	txns *pb.TxnTimestamps) (*pb.OracleDelta, error) {
 	delta := &pb.OracleDelta{}
diff --git a/dgraph/cmd/zero/raft.go b/dgraph/cmd/zero/raft.go
index cbc524f2efc..306b5e0147a 100644
--- a/dgraph/cmd/zero/raft.go
+++ b/dgraph/cmd/zero/raft.go
@@ -20,8 +20,10 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"math"
 	"time"
 
+	otrace "go.opencensus.io/trace"
 	"google.golang.org/grpc"
 
 	"github.com/coreos/etcd/raft"
@@ -142,6 +144,116 @@ func newGroup() *pb.Group {
 	}
 }
 
+func (n *node) handleMemberProposal(member *pb.Member) error {
+	n.server.AssertLock()
+	state := n.server.state
+
+	m := n.server.member(member.Addr)
+	// Ensures that different nodes don't have same address.
+	if m != nil && (m.Id != member.Id || m.GroupId != member.GroupId) {
+		return x.Errorf("Found another member %d with same address: %v", m.Id, m.Addr)
+	}
+	if member.GroupId == 0 {
+		state.Zeros[member.Id] = member
+		if member.Leader {
+			// Unset leader flag for other nodes, there can be only one
+			// leader at a time.
+			for _, m := range state.Zeros {
+				if m.Id != member.Id {
+					m.Leader = false
+				}
+			}
+		}
+		return nil
+	}
+	group := state.Groups[member.GroupId]
+	if group == nil {
+		group = newGroup()
+		state.Groups[member.GroupId] = group
+	}
+	m, has := group.Members[member.Id]
+	if member.AmDead {
+		if has {
+			delete(group.Members, member.Id)
+			state.Removed = append(state.Removed, m)
+			conn.Get().Remove(m.Addr)
+		}
+		// else already removed.
+		return nil
+	}
+	if !has && len(group.Members) >= n.server.NumReplicas {
+		// We shouldn't allow more members than the number of replicas.
+		return x.Errorf("Group reached replication level. Can't add another member: %+v", member)
+	}
+
+	// Create a connection to this server.
+	go conn.Get().Connect(member.Addr)
+
+	group.Members[member.Id] = member
+	// Increment nextGroup when we have enough replicas
+	if member.GroupId == n.server.nextGroup &&
+		len(group.Members) >= n.server.NumReplicas {
+		n.server.nextGroup++
+	}
+	if member.Leader {
+		// Unset leader flag for other nodes, there can be only one
+		// leader at a time.
+		for _, m := range group.Members {
+			if m.Id != member.Id {
+				m.Leader = false
+			}
+		}
+	}
+	// On replay of logs on restart we need to set nextGroup.
+	if n.server.nextGroup <= member.GroupId {
+		n.server.nextGroup = member.GroupId + 1
+	}
+	return nil
+}
+
+func (n *node) handleTabletProposal(tablet *pb.Tablet) error {
+	n.server.AssertLock()
+	state := n.server.state
+
+	if tablet.GroupId == 0 {
+		return x.Errorf("Tablet group id is zero: %+v", tablet)
+	}
+	group := state.Groups[tablet.GroupId]
+	if tablet.Remove {
+		glog.Infof("Removing tablet for attr: [%v], gid: [%v]\n", tablet.Predicate, tablet.GroupId)
+		if group != nil {
+			delete(group.Tablets, tablet.Predicate)
+		}
+		return nil
+	}
+	if group == nil {
+		group = newGroup()
+		state.Groups[tablet.GroupId] = group
+	}
+
+	// There's a edge case that we're handling.
+	// Two servers ask to serve the same tablet, then we need to ensure that
+	// only the first one succeeds.
+	if prev := n.server.servingTablet(tablet.Predicate); prev != nil {
+		if tablet.Force {
+			// TODO: Try and remove this whole Force flag logic.
+			originalGroup := state.Groups[prev.GroupId]
+			delete(originalGroup.Tablets, tablet.Predicate)
+		} else {
+			if prev.GroupId != tablet.GroupId {
+				glog.Infof(
+					"Tablet for attr: [%s], gid: [%d] already served by group: [%d]\n",
+					prev.Predicate, tablet.GroupId, prev.GroupId)
+				return errTabletAlreadyServed
+			}
+			// This update can come from tablet size.
+			tablet.ReadOnly = prev.ReadOnly
+		}
+	}
+	group.Tablets[tablet.Predicate] = tablet
+	return nil
+}
+
 func (n *node) applyProposal(e raftpb.Entry) (string, error) {
 	var p pb.ZeroProposal
 	// Raft commits empty entry on becoming a leader.
@@ -154,6 +266,7 @@ func (n *node) applyProposal(e raftpb.Entry) (string, error) {
 	if len(p.Key) == 0 {
 		return p.Key, errInvalidProposal
 	}
+	span := otrace.FromContext(n.Proposals.Ctx(p.Key))
 
 	n.server.Lock()
 	defer n.server.Unlock()
@@ -172,103 +285,33 @@ func (n *node) applyProposal(e raftpb.Entry) (string, error) {
 		}
 		state.MaxRaftId = p.MaxRaftId
 	}
-	if p.Member != nil {
-		m := n.server.member(p.Member.Addr)
-		// Ensures that different nodes don't have same address.
-		if m != nil && (m.Id != p.Member.Id || m.GroupId != p.Member.GroupId) {
-			return p.Key, errInvalidAddress
-		}
-		if p.Member.GroupId == 0 {
-			state.Zeros[p.Member.Id] = p.Member
-			if p.Member.Leader {
-				// Unset leader flag for other nodes, there can be only one
-				// leader at a time.
-				for _, m := range state.Zeros {
-					if m.Id != p.Member.Id {
-						m.Leader = false
-					}
-				}
+	if p.SnapshotTs != nil {
+		for gid, ts := range p.SnapshotTs {
+			if group, ok := state.Groups[gid]; ok {
+				group.SnapshotTs = x.Max(group.SnapshotTs, ts)
 			}
-			return p.Key, nil
 		}
-		group := state.Groups[p.Member.GroupId]
-		if group == nil {
-			group = newGroup()
-			state.Groups[p.Member.GroupId] = group
+		purgeTs := uint64(math.MaxUint64)
+		for _, group := range state.Groups {
+			purgeTs = x.Min(purgeTs, group.SnapshotTs)
 		}
-		m, has := group.Members[p.Member.Id]
-		if p.Member.AmDead {
-			if has {
-				delete(group.Members, p.Member.Id)
-				state.Removed = append(state.Removed, m)
-				conn.Get().Remove(m.Addr)
-			}
-			// else already removed.
-			return p.Key, nil
-		}
-		if !has && len(group.Members) >= n.server.NumReplicas {
-			// We shouldn't allow more members than the number of replicas.
-			return p.Key, errInvalidProposal
-		}
-
-		// Create a connection to this server.
-		go conn.Get().Connect(p.Member.Addr)
-
-		group.Members[p.Member.Id] = p.Member
-		// Increment nextGroup when we have enough replicas
-		if p.Member.GroupId == n.server.nextGroup &&
-			len(group.Members) >= n.server.NumReplicas {
-			n.server.nextGroup++
-		}
-		if p.Member.Leader {
-			// Unset leader flag for other nodes, there can be only one
-			// leader at a time.
-			for _, m := range group.Members {
-				if m.Id != p.Member.Id {
-					m.Leader = false
-				}
-			}
+		if purgeTs < math.MaxUint64 {
+			n.server.orc.purgeBelow(purgeTs)
 		}
-		// On replay of logs on restart we need to set nextGroup.
-		if n.server.nextGroup <= p.Member.GroupId {
-			n.server.nextGroup = p.Member.GroupId + 1
+	}
+	if p.Member != nil {
+		if err := n.handleMemberProposal(p.Member); err != nil {
+			span.Annotatef(nil, "While applying membership proposal: %+v", err)
+			glog.Errorf("While applying membership proposal: %+v", err)
+			return p.Key, err
 		}
 	}
 	if p.Tablet != nil {
-		if p.Tablet.GroupId == 0 {
-			return p.Key, errInvalidProposal
-		}
-		group := state.Groups[p.Tablet.GroupId]
-		if p.Tablet.Remove {
-			glog.Infof("Removing tablet for attr: [%v], gid: [%v]\n", p.Tablet.Predicate, p.Tablet.GroupId)
-			if group != nil {
-				delete(group.Tablets, p.Tablet.Predicate)
-			}
-			return p.Key, nil
-		}
-		if group == nil {
-			group = newGroup()
-			state.Groups[p.Tablet.GroupId] = group
-		}
-
-		// There's a edge case that we're handling.
-		// Two servers ask to serve the same tablet, then we need to ensure that
-		// only the first one succeeds.
-		if tablet := n.server.servingTablet(p.Tablet.Predicate); tablet != nil {
-			if p.Tablet.Force {
-				originalGroup := state.Groups[tablet.GroupId]
-				delete(originalGroup.Tablets, p.Tablet.Predicate)
-			} else {
-				if tablet.GroupId != p.Tablet.GroupId {
-					glog.Infof("Tablet for attr: [%s], gid: [%d] is already being served by group: [%d]\n",
-						tablet.Predicate, p.Tablet.GroupId, tablet.GroupId)
-					return p.Key, errTabletAlreadyServed
-				}
-				// This update can come from tablet size.
-				p.Tablet.ReadOnly = tablet.ReadOnly
-			}
+		if err := n.handleTabletProposal(p.Tablet); err != nil {
+			span.Annotatef(nil, "While applying tablet proposal: %+v", err)
+			glog.Errorf("While applying tablet proposal: %+v", err)
+			return p.Key, err
 		}
-		group.Tablets[p.Tablet.Predicate] = p.Tablet
 	}
 
 	if p.MaxLeaseId > state.MaxLeaseId {
@@ -359,19 +402,18 @@ func (n *node) initAndStartNode() error {
 	} else if len(opts.peer) > 0 {
 		p := conn.Get().Connect(opts.peer)
 		if p == nil {
-			return errInvalidAddress
+			return x.Errorf("Unhealthy connection to %v", opts.peer)
 		}
 
 		gconn := p.Get()
 		c := pb.NewRaftClient(gconn)
-		err := errJoinCluster
 		timeout := 8 * time.Second
-		for i := 0; err != nil; i++ {
+		for {
 			ctx, cancel := context.WithTimeout(n.ctx, timeout)
 			defer cancel()
 			// JoinCluster can block indefinitely, raft ignores conf change proposal
 			// if it has pending configuration.
-			_, err = c.JoinCluster(ctx, n.RaftContext)
+			_, err := c.JoinCluster(ctx, n.RaftContext)
 			if err == nil {
 				break
 			}
@@ -387,9 +429,6 @@ func (n *node) initAndStartNode() error {
 			}
 			time.Sleep(timeout) // This is useful because JoinCluster can exit immediately.
 		}
-		if err != nil {
-			x.Fatalf("Max retries exceeded while trying to join cluster: %v\n", err)
-		}
 		glog.Infof("[%d] Starting node\n", n.Id)
 		n.SetRaft(raft.StartNode(n.Cfg, nil))
 
@@ -519,7 +558,7 @@ func (n *node) Run() {
 
 				} else if entry.Type == raftpb.EntryNormal {
 					key, err := n.applyProposal(entry)
-					if err != nil && err != errTabletAlreadyServed {
+					if err != nil {
 						glog.Errorf("While applying proposal: %v\n", err)
 					}
 					n.Proposals.Done(key, err)
diff --git a/dgraph/cmd/zero/zero.go b/dgraph/cmd/zero/zero.go
index 5f38e3cc990..cbf16257ef2 100644
--- a/dgraph/cmd/zero/zero.go
+++ b/dgraph/cmd/zero/zero.go
@@ -22,8 +22,10 @@ import (
 	"sync"
 	"time"
 
+	otrace "go.opencensus.io/trace"
 	"golang.org/x/net/context"
 
+	"github.com/dgraph-io/dgo/protos/api"
 	"github.com/dgraph-io/dgraph/conn"
 	"github.com/dgraph-io/dgraph/protos/pb"
 	"github.com/dgraph-io/dgraph/x"
@@ -34,13 +36,7 @@ import (
 var (
 	emptyMembershipState pb.MembershipState
 	emptyConnectionState pb.ConnectionState
-	errInvalidId         = errors.New("Invalid server id")
-	errInvalidAddress    = errors.New("Invalid address")
-	errEmptyPredicate    = errors.New("Empty predicate")
-	errInvalidGroup      = errors.New("Invalid group id")
-	errInvalidQuery      = errors.New("Invalid query")
 	errInternalError     = errors.New("Internal server error")
-	errJoinCluster       = errors.New("Unable to join cluster")
 	errUnknownMember     = errors.New("Unknown cluster member")
 	errUpdatedMember     = errors.New("Cluster member has updated credentials.")
 	errServerShutDown    = errors.New("Server is being shut down.")
@@ -82,7 +78,6 @@ func (s *Server) Init() {
 	s.leaderChangeCh = make(chan struct{}, 1)
 	s.shutDownCh = make(chan struct{}, 1)
 	go s.rebalanceTablets()
-	go s.purgeOracle()
 }
 
 func (s *Server) periodicallyPostTelemetry() {
@@ -294,7 +289,7 @@ func (s *Server) servingTablet(tablet string) *pb.Tablet {
 func (s *Server) createProposals(dst *pb.Group) ([]*pb.ZeroProposal, error) {
 	var res []*pb.ZeroProposal
 	if len(dst.Members) > 1 {
-		return res, errInvalidQuery
+		return res, x.Errorf("Create Proposal: Invalid group: %+v", dst)
 	}
 
 	s.RLock()
@@ -321,6 +316,11 @@ func (s *Server) createProposals(dst *pb.Group) ([]*pb.ZeroProposal, error) {
 			// Don't continue to tablets if request is not from the leader.
 			return res, nil
 		}
+		if dst.SnapshotTs > group.SnapshotTs {
+			res = append(res, &pb.ZeroProposal{
+				SnapshotTs: map[uint32]uint64{dstMember.GroupId: dst.SnapshotTs},
+			})
+		}
 	}
 	for key, dstTablet := range dst.Tablets {
 		group, has := s.state.Groups[dstTablet.GroupId]
@@ -386,7 +386,7 @@ func (s *Server) Connect(ctx context.Context,
 		return cs, err
 	}
 	if len(m.Addr) == 0 {
-		return &emptyConnectionState, errInvalidAddress
+		return &emptyConnectionState, x.Errorf("No address provided: %+v", m)
 	}
 
 	for _, member := range s.membershipState().Removed {
@@ -482,15 +482,19 @@ func (s *Server) Connect(ctx context.Context,
 
 func (s *Server) ShouldServe(
 	ctx context.Context, tablet *pb.Tablet) (resp *pb.Tablet, err error) {
+	ctx, span := otrace.StartSpan(ctx, "Zero.ShouldServe")
+	defer span.End()
+
 	if len(tablet.Predicate) == 0 {
-		return resp, errEmptyPredicate
+		return resp, x.Errorf("Tablet predicate is empty in %+v", tablet)
 	}
 	if tablet.GroupId == 0 {
-		return resp, errInvalidGroup
+		return resp, x.Errorf("Group ID is Zero in %+v", tablet)
 	}
 
 	// Check who is serving this tablet.
 	tab := s.ServingTablet(tablet.Predicate)
+	span.Annotatef(nil, "Tablet for %s: %+v", tablet.Predicate, tab)
 	if tab != nil {
 		// Someone is serving this tablet. Could be the caller as well.
 		// The caller should compare the returned group against the group it holds to check who's
@@ -504,74 +508,59 @@ func (s *Server) ShouldServe(
 	tablet.Force = false
 	proposal.Tablet = tablet
 	if err := s.Node.proposeAndWait(ctx, &proposal); err != nil && err != errTabletAlreadyServed {
+		span.Annotatef(nil, "While proposing tablet: %v", err)
 		return tablet, err
 	}
 	tab = s.ServingTablet(tablet.Predicate)
 	x.AssertTrue(tab != nil)
+	span.Annotatef(nil, "Now serving tablet for %s: %+v", tablet.Predicate, tab)
 	return tab, nil
 }
 
-func (s *Server) receiveUpdates(stream pb.Zero_UpdateServer) error {
-	for {
-		group, err := stream.Recv()
-		// Due to closeSend on client Side
-		if group == nil {
-			return nil
-		}
-		// Could be EOF also, but we don't care about error type.
-		if err != nil {
-			return err
-		}
-		proposals, err := s.createProposals(group)
-		if err != nil {
-			// Sleep here so the caller doesn't keep on retrying indefinitely, creating a busy
-			// wait.
-			time.Sleep(time.Second)
-			glog.Errorf("Error while creating proposals in stream %v\n", err)
-			return err
-		}
+func (s *Server) UpdateMembership(ctx context.Context, group *pb.Group) (*api.Payload, error) {
+	proposals, err := s.createProposals(group)
+	if err != nil {
+		// Sleep here so the caller doesn't keep on retrying indefinitely, creating a busy
+		// wait.
+		time.Sleep(time.Second)
+		glog.Errorf("Error while creating proposals in Update: %v\n", err)
+		return nil, err
+	}
 
-		errCh := make(chan error)
-		for _, pr := range proposals {
-			go func(pr *pb.ZeroProposal) {
-				errCh <- s.Node.proposeAndWait(context.Background(), pr)
-			}(pr)
-		}
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
 
-		for range proposals {
-			// We Don't care about these errors
-			// Ideally shouldn't error out.
-			if err := <-errCh; err != nil {
-				glog.Errorf("Error while applying proposal in update stream %v\n", err)
-			}
+	errCh := make(chan error)
+	for _, pr := range proposals {
+		go func(pr *pb.ZeroProposal) {
+			errCh <- s.Node.proposeAndWait(ctx, pr)
+		}(pr)
+	}
+
+	for range proposals {
+		// We Don't care about these errors
+		// Ideally shouldn't error out.
+		if err := <-errCh; err != nil {
+			glog.Errorf("Error while applying proposal in Update stream: %v\n", err)
+			return nil, err
 		}
 	}
+	return &api.Payload{Data: []byte("OK")}, nil
 }
 
-func (s *Server) Update(stream pb.Zero_UpdateServer) error {
-	che := make(chan error, 1)
-	// Server side cancellation can only be done by existing the handler
-	// since Recv is blocking we need to run it in a goroutine.
-	go func() {
-		che <- s.receiveUpdates(stream)
-	}()
-
+func (s *Server) StreamMembership(_ *api.Payload, stream pb.Zero_StreamMembershipServer) error {
 	// Send MembershipState right away. So, the connection is correctly established.
 	ctx := stream.Context()
 	ms, err := s.latestMembershipState(ctx)
 	if err != nil {
 		return err
 	}
-	if ms != nil {
-		// grpc will error out during marshalling if we send nil.
-		if err := stream.Send(ms); err != nil {
-			return err
-		}
+	if err := stream.Send(ms); err != nil {
+		return err
 	}
 
 	ticker := time.NewTicker(time.Second)
 	defer ticker.Stop()
-
 	for {
 		select {
 		case <-ticker.C:
@@ -580,13 +569,9 @@ func (s *Server) Update(stream pb.Zero_UpdateServer) error {
 			if err != nil {
 				return err
 			}
-			// TODO: Don't send if only lease has changed.
 			if err := stream.Send(ms); err != nil {
 				return err
 			}
-		case err := <-che:
-			// Error while receiving updates.
-			return err
 		case <-ctx.Done():
 			return ctx.Err()
 		case <-s.shutDownCh:
@@ -599,5 +584,9 @@ func (s *Server) latestMembershipState(ctx context.Context) (*pb.MembershipState
 	if err := s.Node.WaitLinearizableRead(ctx); err != nil {
 		return nil, err
 	}
-	return s.membershipState(), nil
+	ms := s.membershipState()
+	if ms == nil {
+		return &pb.MembershipState{}, nil
+	}
+	return ms, nil
 }
diff --git a/edgraph/server.go b/edgraph/server.go
index f9cccb2d4b1..c2ee5833684 100644
--- a/edgraph/server.go
+++ b/edgraph/server.go
@@ -264,6 +264,10 @@ func (s *ServerState) getTimestamp(readOnly bool) uint64 {
 }
 
 func (s *Server) Alter(ctx context.Context, op *api.Operation) (*api.Payload, error) {
+	ctx, span := otrace.StartSpan(ctx, "Server.Alter")
+	defer span.End()
+	span.Annotatef(nil, "Alter operation: %+v", op)
+
 	// Always print out Alter operations because they are important and rare.
 	glog.Infof("Received ALTER op: %+v", op)
 
diff --git a/posting/oracle.go b/posting/oracle.go
index 1b7a6123775..a336c6a3673 100644
--- a/posting/oracle.go
+++ b/posting/oracle.go
@@ -120,15 +120,6 @@ func (o *oracle) MinPendingStartTs() uint64 {
 	return min
 }
 
-// PurgeTs gives a start ts, below which all entries can be purged by Zero,
-// because their status has been successfully applied to Raft group.
-func (o *oracle) PurgeTs() uint64 {
-	// o.MinPendingStartTs can be inf, but we don't want Zero to delete new
-	// records that haven't yet reached us. So, we also consider MaxAssigned
-	// that we have received so far, so only records below MaxAssigned are purged.
-	return x.Min(o.MinPendingStartTs()-1, o.MaxAssigned())
-}
-
 func (o *oracle) TxnOlderThan(dur time.Duration) (res []uint64) {
 	o.RLock()
 	defer o.RUnlock()
diff --git a/protos/pb.proto b/protos/pb.proto
index 7b73a2dd957..e2773908766 100644
--- a/protos/pb.proto
+++ b/protos/pb.proto
@@ -131,9 +131,11 @@ message Member {
 message Group {
 	map<uint64, Member> members = 1; // Raft ID is the key.
 	map<string, Tablet> tablets = 2; // Predicate + others are key.
+	uint64 snapshot_ts          = 3; // Stores Snapshot transaction ts.
 }
 
 message ZeroProposal {
+	map<uint32, uint64> snapshot_ts = 1; // Group ID -> Snapshot Ts.
 	Member member = 2;
 	Tablet tablet = 3;
 	uint64 maxLeaseId = 4;
@@ -399,8 +401,11 @@ service Raft {
 }
 
 service Zero {
+	// These 3 endpoints are for handling membership.
 	rpc Connect (Member)               returns (ConnectionState) {}
-	rpc Update (stream Group)          returns (stream MembershipState) {}
+	rpc UpdateMembership (Group)                 returns (api.Payload) {}
+	rpc StreamMembership (api.Payload)       returns (stream MembershipState) {}
+
 	rpc Oracle (api.Payload)           returns (stream OracleDelta) {}
 	rpc ShouldServe (Tablet)           returns (Tablet) {}
 	rpc AssignUids (Num)               returns (AssignedIds) {}
@@ -416,7 +421,6 @@ service Worker {
 	rpc StreamSnapshot (stream Snapshot)    returns (stream KVS) {}
 	rpc Sort (SortMessage)                  returns (SortResult) {}
 	rpc Schema (SchemaRequest)              returns (SchemaResult) {}
-	rpc PurgeTs (api.Payload)               returns (Num) {}
 	rpc Backup (BackupRequest)							returns (Status) {}
 	rpc Export (ExportRequest)              returns (Status) {}
 	rpc ReceivePredicate(stream KVS)        returns (api.Payload) {}
diff --git a/protos/pb/pb.pb.go b/protos/pb/pb.pb.go
index 3a13e43104f..22085b5fe37 100644
--- a/protos/pb/pb.pb.go
+++ b/protos/pb/pb.pb.go
@@ -48,7 +48,7 @@ func (x DirectedEdge_Op) String() string {
 	return proto.EnumName(DirectedEdge_Op_name, int32(x))
 }
 func (DirectedEdge_Op) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{17, 0}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{17, 0}
 }
 
 type Posting_ValType int32
@@ -95,7 +95,7 @@ func (x Posting_ValType) String() string {
 	return proto.EnumName(Posting_ValType_name, int32(x))
 }
 func (Posting_ValType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{24, 0}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{24, 0}
 }
 
 type Posting_PostingType int32
@@ -121,7 +121,7 @@ func (x Posting_PostingType) String() string {
 	return proto.EnumName(Posting_PostingType_name, int32(x))
 }
 func (Posting_PostingType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{24, 1}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{24, 1}
 }
 
 type SchemaUpdate_Directive int32
@@ -150,7 +150,7 @@ func (x SchemaUpdate_Directive) String() string {
 	return proto.EnumName(SchemaUpdate_Directive_name, int32(x))
 }
 func (SchemaUpdate_Directive) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{36, 0}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{36, 0}
 }
 
 type List struct {
@@ -164,7 +164,7 @@ func (m *List) Reset()         { *m = List{} }
 func (m *List) String() string { return proto.CompactTextString(m) }
 func (*List) ProtoMessage()    {}
 func (*List) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{0}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{0}
 }
 func (m *List) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -212,7 +212,7 @@ func (m *TaskValue) Reset()         { *m = TaskValue{} }
 func (m *TaskValue) String() string { return proto.CompactTextString(m) }
 func (*TaskValue) ProtoMessage()    {}
 func (*TaskValue) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{1}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{1}
 }
 func (m *TaskValue) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -268,7 +268,7 @@ func (m *SrcFunction) Reset()         { *m = SrcFunction{} }
 func (m *SrcFunction) String() string { return proto.CompactTextString(m) }
 func (*SrcFunction) ProtoMessage()    {}
 func (*SrcFunction) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{2}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{2}
 }
 func (m *SrcFunction) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -341,7 +341,7 @@ func (m *Query) Reset()         { *m = Query{} }
 func (m *Query) String() string { return proto.CompactTextString(m) }
 func (*Query) ProtoMessage()    {}
 func (*Query) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{3}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{3}
 }
 func (m *Query) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -458,7 +458,7 @@ func (m *ValueList) Reset()         { *m = ValueList{} }
 func (m *ValueList) String() string { return proto.CompactTextString(m) }
 func (*ValueList) ProtoMessage()    {}
 func (*ValueList) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{4}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{4}
 }
 func (m *ValueList) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -505,7 +505,7 @@ func (m *LangList) Reset()         { *m = LangList{} }
 func (m *LangList) String() string { return proto.CompactTextString(m) }
 func (*LangList) ProtoMessage()    {}
 func (*LangList) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{5}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{5}
 }
 func (m *LangList) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -558,7 +558,7 @@ func (m *Result) Reset()         { *m = Result{} }
 func (m *Result) String() string { return proto.CompactTextString(m) }
 func (*Result) ProtoMessage()    {}
 func (*Result) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{6}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{6}
 }
 func (m *Result) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -649,7 +649,7 @@ func (m *Order) Reset()         { *m = Order{} }
 func (m *Order) String() string { return proto.CompactTextString(m) }
 func (*Order) ProtoMessage()    {}
 func (*Order) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{7}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{7}
 }
 func (m *Order) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -714,7 +714,7 @@ func (m *SortMessage) Reset()         { *m = SortMessage{} }
 func (m *SortMessage) String() string { return proto.CompactTextString(m) }
 func (*SortMessage) ProtoMessage()    {}
 func (*SortMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{8}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{8}
 }
 func (m *SortMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -789,7 +789,7 @@ func (m *SortResult) Reset()         { *m = SortResult{} }
 func (m *SortResult) String() string { return proto.CompactTextString(m) }
 func (*SortResult) ProtoMessage()    {}
 func (*SortResult) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{9}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{9}
 }
 func (m *SortResult) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -839,7 +839,7 @@ func (m *RaftContext) Reset()         { *m = RaftContext{} }
 func (m *RaftContext) String() string { return proto.CompactTextString(m) }
 func (*RaftContext) ProtoMessage()    {}
 func (*RaftContext) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{10}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{10}
 }
 func (m *RaftContext) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -916,7 +916,7 @@ func (m *Member) Reset()         { *m = Member{} }
 func (m *Member) String() string { return proto.CompactTextString(m) }
 func (*Member) ProtoMessage()    {}
 func (*Member) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{11}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{11}
 }
 func (m *Member) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -997,6 +997,7 @@ func (m *Member) GetClusterInfoOnly() bool {
 type Group struct {
 	Members              map[uint64]*Member `protobuf:"bytes,1,rep,name=members" json:"members,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value"`
 	Tablets              map[string]*Tablet `protobuf:"bytes,2,rep,name=tablets" json:"tablets,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value"`
+	SnapshotTs           uint64             `protobuf:"varint,3,opt,name=snapshot_ts,json=snapshotTs,proto3" json:"snapshot_ts,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
 	XXX_unrecognized     []byte             `json:"-"`
 	XXX_sizecache        int32              `json:"-"`
@@ -1006,7 +1007,7 @@ func (m *Group) Reset()         { *m = Group{} }
 func (m *Group) String() string { return proto.CompactTextString(m) }
 func (*Group) ProtoMessage()    {}
 func (*Group) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{12}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{12}
 }
 func (m *Group) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1049,25 +1050,33 @@ func (m *Group) GetTablets() map[string]*Tablet {
 	return nil
 }
 
+func (m *Group) GetSnapshotTs() uint64 {
+	if m != nil {
+		return m.SnapshotTs
+	}
+	return 0
+}
+
 type ZeroProposal struct {
-	Member               *Member         `protobuf:"bytes,2,opt,name=member" json:"member,omitempty"`
-	Tablet               *Tablet         `protobuf:"bytes,3,opt,name=tablet" json:"tablet,omitempty"`
-	MaxLeaseId           uint64          `protobuf:"varint,4,opt,name=maxLeaseId,proto3" json:"maxLeaseId,omitempty"`
-	MaxTxnTs             uint64          `protobuf:"varint,5,opt,name=maxTxnTs,proto3" json:"maxTxnTs,omitempty"`
-	MaxRaftId            uint64          `protobuf:"varint,6,opt,name=maxRaftId,proto3" json:"maxRaftId,omitempty"`
-	Txn                  *api.TxnContext `protobuf:"bytes,7,opt,name=txn" json:"txn,omitempty"`
-	Key                  string          `protobuf:"bytes,8,opt,name=key,proto3" json:"key,omitempty"`
-	Cid                  string          `protobuf:"bytes,9,opt,name=cid,proto3" json:"cid,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
-	XXX_unrecognized     []byte          `json:"-"`
-	XXX_sizecache        int32           `json:"-"`
+	SnapshotTs           map[uint32]uint64 `protobuf:"bytes,1,rep,name=snapshot_ts,json=snapshotTs" json:"snapshot_ts,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
+	Member               *Member           `protobuf:"bytes,2,opt,name=member" json:"member,omitempty"`
+	Tablet               *Tablet           `protobuf:"bytes,3,opt,name=tablet" json:"tablet,omitempty"`
+	MaxLeaseId           uint64            `protobuf:"varint,4,opt,name=maxLeaseId,proto3" json:"maxLeaseId,omitempty"`
+	MaxTxnTs             uint64            `protobuf:"varint,5,opt,name=maxTxnTs,proto3" json:"maxTxnTs,omitempty"`
+	MaxRaftId            uint64            `protobuf:"varint,6,opt,name=maxRaftId,proto3" json:"maxRaftId,omitempty"`
+	Txn                  *api.TxnContext   `protobuf:"bytes,7,opt,name=txn" json:"txn,omitempty"`
+	Key                  string            `protobuf:"bytes,8,opt,name=key,proto3" json:"key,omitempty"`
+	Cid                  string            `protobuf:"bytes,9,opt,name=cid,proto3" json:"cid,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
 }
 
 func (m *ZeroProposal) Reset()         { *m = ZeroProposal{} }
 func (m *ZeroProposal) String() string { return proto.CompactTextString(m) }
 func (*ZeroProposal) ProtoMessage()    {}
 func (*ZeroProposal) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{13}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{13}
 }
 func (m *ZeroProposal) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1096,6 +1105,13 @@ func (m *ZeroProposal) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_ZeroProposal proto.InternalMessageInfo
 
+func (m *ZeroProposal) GetSnapshotTs() map[uint32]uint64 {
+	if m != nil {
+		return m.SnapshotTs
+	}
+	return nil
+}
+
 func (m *ZeroProposal) GetMember() *Member {
 	if m != nil {
 		return m.Member
@@ -1173,7 +1189,7 @@ func (m *MembershipState) Reset()         { *m = MembershipState{} }
 func (m *MembershipState) String() string { return proto.CompactTextString(m) }
 func (*MembershipState) ProtoMessage()    {}
 func (*MembershipState) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{14}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{14}
 }
 func (m *MembershipState) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1271,7 +1287,7 @@ func (m *ConnectionState) Reset()         { *m = ConnectionState{} }
 func (m *ConnectionState) String() string { return proto.CompactTextString(m) }
 func (*ConnectionState) ProtoMessage()    {}
 func (*ConnectionState) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{15}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{15}
 }
 func (m *ConnectionState) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1337,7 +1353,7 @@ func (m *Tablet) Reset()         { *m = Tablet{} }
 func (m *Tablet) String() string { return proto.CompactTextString(m) }
 func (*Tablet) ProtoMessage()    {}
 func (*Tablet) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{16}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{16}
 }
 func (m *Tablet) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1427,7 +1443,7 @@ func (m *DirectedEdge) Reset()         { *m = DirectedEdge{} }
 func (m *DirectedEdge) String() string { return proto.CompactTextString(m) }
 func (*DirectedEdge) ProtoMessage()    {}
 func (*DirectedEdge) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{17}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{17}
 }
 func (m *DirectedEdge) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1535,7 +1551,7 @@ func (m *Mutations) Reset()         { *m = Mutations{} }
 func (m *Mutations) String() string { return proto.CompactTextString(m) }
 func (*Mutations) ProtoMessage()    {}
 func (*Mutations) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{18}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{18}
 }
 func (m *Mutations) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1617,7 +1633,7 @@ func (m *KeyValues) Reset()         { *m = KeyValues{} }
 func (m *KeyValues) String() string { return proto.CompactTextString(m) }
 func (*KeyValues) ProtoMessage()    {}
 func (*KeyValues) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{19}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{19}
 }
 func (m *KeyValues) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1668,7 +1684,7 @@ func (m *Snapshot) Reset()         { *m = Snapshot{} }
 func (m *Snapshot) String() string { return proto.CompactTextString(m) }
 func (*Snapshot) ProtoMessage()    {}
 func (*Snapshot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{20}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{20}
 }
 func (m *Snapshot) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1743,7 +1759,7 @@ func (m *Proposal) Reset()         { *m = Proposal{} }
 func (m *Proposal) String() string { return proto.CompactTextString(m) }
 func (*Proposal) ProtoMessage()    {}
 func (*Proposal) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{21}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{21}
 }
 func (m *Proposal) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1841,7 +1857,7 @@ func (m *KVS) Reset()         { *m = KVS{} }
 func (m *KVS) String() string { return proto.CompactTextString(m) }
 func (*KVS) ProtoMessage()    {}
 func (*KVS) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{22}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{22}
 }
 func (m *KVS) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1898,7 +1914,7 @@ func (m *KV) Reset()         { *m = KV{} }
 func (m *KV) String() string { return proto.CompactTextString(m) }
 func (*KV) ProtoMessage()    {}
 func (*KV) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{23}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{23}
 }
 func (m *KV) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1977,7 +1993,7 @@ func (m *Posting) Reset()         { *m = Posting{} }
 func (m *Posting) String() string { return proto.CompactTextString(m) }
 func (*Posting) ProtoMessage()    {}
 func (*Posting) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{24}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{24}
 }
 func (m *Posting) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2091,7 +2107,7 @@ func (m *UidBlock) Reset()         { *m = UidBlock{} }
 func (m *UidBlock) String() string { return proto.CompactTextString(m) }
 func (*UidBlock) ProtoMessage()    {}
 func (*UidBlock) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{25}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{25}
 }
 func (m *UidBlock) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2146,7 +2162,7 @@ func (m *UidPack) Reset()         { *m = UidPack{} }
 func (m *UidPack) String() string { return proto.CompactTextString(m) }
 func (*UidPack) ProtoMessage()    {}
 func (*UidPack) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{26}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{26}
 }
 func (m *UidPack) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2202,7 +2218,7 @@ func (m *PostingList) Reset()         { *m = PostingList{} }
 func (m *PostingList) String() string { return proto.CompactTextString(m) }
 func (*PostingList) ProtoMessage()    {}
 func (*PostingList) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{27}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{27}
 }
 func (m *PostingList) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2264,7 +2280,7 @@ func (m *FacetParam) Reset()         { *m = FacetParam{} }
 func (m *FacetParam) String() string { return proto.CompactTextString(m) }
 func (*FacetParam) ProtoMessage()    {}
 func (*FacetParam) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{28}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{28}
 }
 func (m *FacetParam) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2319,7 +2335,7 @@ func (m *FacetParams) Reset()         { *m = FacetParams{} }
 func (m *FacetParams) String() string { return proto.CompactTextString(m) }
 func (*FacetParams) ProtoMessage()    {}
 func (*FacetParams) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{29}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{29}
 }
 func (m *FacetParams) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2373,7 +2389,7 @@ func (m *Facets) Reset()         { *m = Facets{} }
 func (m *Facets) String() string { return proto.CompactTextString(m) }
 func (*Facets) ProtoMessage()    {}
 func (*Facets) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{30}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{30}
 }
 func (m *Facets) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2420,7 +2436,7 @@ func (m *FacetsList) Reset()         { *m = FacetsList{} }
 func (m *FacetsList) String() string { return proto.CompactTextString(m) }
 func (*FacetsList) ProtoMessage()    {}
 func (*FacetsList) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{31}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{31}
 }
 func (m *FacetsList) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2469,7 +2485,7 @@ func (m *Function) Reset()         { *m = Function{} }
 func (m *Function) String() string { return proto.CompactTextString(m) }
 func (*Function) ProtoMessage()    {}
 func (*Function) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{32}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{32}
 }
 func (m *Function) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2533,7 +2549,7 @@ func (m *FilterTree) Reset()         { *m = FilterTree{} }
 func (m *FilterTree) String() string { return proto.CompactTextString(m) }
 func (*FilterTree) ProtoMessage()    {}
 func (*FilterTree) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{33}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{33}
 }
 func (m *FilterTree) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2598,7 +2614,7 @@ func (m *SchemaRequest) Reset()         { *m = SchemaRequest{} }
 func (m *SchemaRequest) String() string { return proto.CompactTextString(m) }
 func (*SchemaRequest) ProtoMessage()    {}
 func (*SchemaRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{34}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{34}
 }
 func (m *SchemaRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2659,7 +2675,7 @@ func (m *SchemaResult) Reset()         { *m = SchemaResult{} }
 func (m *SchemaResult) String() string { return proto.CompactTextString(m) }
 func (*SchemaResult) ProtoMessage()    {}
 func (*SchemaResult) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{35}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{35}
 }
 func (m *SchemaResult) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2713,7 +2729,7 @@ func (m *SchemaUpdate) Reset()         { *m = SchemaUpdate{} }
 func (m *SchemaUpdate) String() string { return proto.CompactTextString(m) }
 func (*SchemaUpdate) ProtoMessage()    {}
 func (*SchemaUpdate) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{36}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{36}
 }
 func (m *SchemaUpdate) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2813,7 +2829,7 @@ func (m *MapEntry) Reset()         { *m = MapEntry{} }
 func (m *MapEntry) String() string { return proto.CompactTextString(m) }
 func (*MapEntry) ProtoMessage()    {}
 func (*MapEntry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{37}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{37}
 }
 func (m *MapEntry) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2877,7 +2893,7 @@ func (m *MovePredicatePayload) Reset()         { *m = MovePredicatePayload{} }
 func (m *MovePredicatePayload) String() string { return proto.CompactTextString(m) }
 func (*MovePredicatePayload) ProtoMessage()    {}
 func (*MovePredicatePayload) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{38}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{38}
 }
 func (m *MovePredicatePayload) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2946,7 +2962,7 @@ func (m *TxnStatus) Reset()         { *m = TxnStatus{} }
 func (m *TxnStatus) String() string { return proto.CompactTextString(m) }
 func (*TxnStatus) ProtoMessage()    {}
 func (*TxnStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{39}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{39}
 }
 func (m *TxnStatus) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3001,7 +3017,7 @@ func (m *OracleDelta) Reset()         { *m = OracleDelta{} }
 func (m *OracleDelta) String() string { return proto.CompactTextString(m) }
 func (*OracleDelta) ProtoMessage()    {}
 func (*OracleDelta) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{40}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{40}
 }
 func (m *OracleDelta) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3055,7 +3071,7 @@ func (m *TxnTimestamps) Reset()         { *m = TxnTimestamps{} }
 func (m *TxnTimestamps) String() string { return proto.CompactTextString(m) }
 func (*TxnTimestamps) ProtoMessage()    {}
 func (*TxnTimestamps) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{41}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{41}
 }
 func (m *TxnTimestamps) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3102,7 +3118,7 @@ func (m *PeerResponse) Reset()         { *m = PeerResponse{} }
 func (m *PeerResponse) String() string { return proto.CompactTextString(m) }
 func (*PeerResponse) ProtoMessage()    {}
 func (*PeerResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{42}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{42}
 }
 func (m *PeerResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3150,7 +3166,7 @@ func (m *RaftBatch) Reset()         { *m = RaftBatch{} }
 func (m *RaftBatch) String() string { return proto.CompactTextString(m) }
 func (*RaftBatch) ProtoMessage()    {}
 func (*RaftBatch) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{43}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{43}
 }
 func (m *RaftBatch) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3205,7 +3221,7 @@ func (m *Num) Reset()         { *m = Num{} }
 func (m *Num) String() string { return proto.CompactTextString(m) }
 func (*Num) ProtoMessage()    {}
 func (*Num) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{44}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{44}
 }
 func (m *Num) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3262,7 +3278,7 @@ func (m *AssignedIds) Reset()         { *m = AssignedIds{} }
 func (m *AssignedIds) String() string { return proto.CompactTextString(m) }
 func (*AssignedIds) ProtoMessage()    {}
 func (*AssignedIds) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{45}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{45}
 }
 func (m *AssignedIds) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3324,7 +3340,7 @@ func (m *SnapshotMeta) Reset()         { *m = SnapshotMeta{} }
 func (m *SnapshotMeta) String() string { return proto.CompactTextString(m) }
 func (*SnapshotMeta) ProtoMessage()    {}
 func (*SnapshotMeta) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{46}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{46}
 }
 func (m *SnapshotMeta) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3368,7 +3384,7 @@ func (m *SnapshotMeta) GetGroupId() uint32 {
 }
 
 // Status describes a general status response.
-// code: 0 = success, -1 = unknown failure
+// code: 0 = success, 0 != failure.
 type Status struct {
 	Code                 int32    `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
 	Msg                  string   `protobuf:"bytes,2,opt,name=msg,proto3" json:"msg,omitempty"`
@@ -3381,7 +3397,7 @@ func (m *Status) Reset()         { *m = Status{} }
 func (m *Status) String() string { return proto.CompactTextString(m) }
 func (*Status) ProtoMessage()    {}
 func (*Status) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{47}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{47}
 }
 func (m *Status) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3438,7 +3454,7 @@ func (m *BackupRequest) Reset()         { *m = BackupRequest{} }
 func (m *BackupRequest) String() string { return proto.CompactTextString(m) }
 func (*BackupRequest) ProtoMessage()    {}
 func (*BackupRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{48}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{48}
 }
 func (m *BackupRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3508,7 +3524,7 @@ func (m *ExportRequest) Reset()         { *m = ExportRequest{} }
 func (m *ExportRequest) String() string { return proto.CompactTextString(m) }
 func (*ExportRequest) ProtoMessage()    {}
 func (*ExportRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pb_1efee8619f75cb94, []int{49}
+	return fileDescriptor_pb_a9faf9bf79258c83, []int{49}
 }
 func (m *ExportRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3575,6 +3591,7 @@ func init() {
 	proto.RegisterMapType((map[uint64]*Member)(nil), "pb.Group.MembersEntry")
 	proto.RegisterMapType((map[string]*Tablet)(nil), "pb.Group.TabletsEntry")
 	proto.RegisterType((*ZeroProposal)(nil), "pb.ZeroProposal")
+	proto.RegisterMapType((map[uint32]uint64)(nil), "pb.ZeroProposal.SnapshotTsEntry")
 	proto.RegisterType((*MembershipState)(nil), "pb.MembershipState")
 	proto.RegisterMapType((map[uint32]*Group)(nil), "pb.MembershipState.GroupsEntry")
 	proto.RegisterMapType((map[uint64]*Member)(nil), "pb.MembershipState.ZerosEntry")
@@ -3794,8 +3811,10 @@ var _Raft_serviceDesc = grpc.ServiceDesc{
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
 type ZeroClient interface {
+	// These 3 endpoints are for handling membership.
 	Connect(ctx context.Context, in *Member, opts ...grpc.CallOption) (*ConnectionState, error)
-	Update(ctx context.Context, opts ...grpc.CallOption) (Zero_UpdateClient, error)
+	UpdateMembership(ctx context.Context, in *Group, opts ...grpc.CallOption) (*api.Payload, error)
+	StreamMembership(ctx context.Context, in *api.Payload, opts ...grpc.CallOption) (Zero_StreamMembershipClient, error)
 	Oracle(ctx context.Context, in *api.Payload, opts ...grpc.CallOption) (Zero_OracleClient, error)
 	ShouldServe(ctx context.Context, in *Tablet, opts ...grpc.CallOption) (*Tablet, error)
 	AssignUids(ctx context.Context, in *Num, opts ...grpc.CallOption) (*AssignedIds, error)
@@ -3821,30 +3840,40 @@ func (c *zeroClient) Connect(ctx context.Context, in *Member, opts ...grpc.CallO
 	return out, nil
 }
 
-func (c *zeroClient) Update(ctx context.Context, opts ...grpc.CallOption) (Zero_UpdateClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_Zero_serviceDesc.Streams[0], "/pb.Zero/Update", opts...)
+func (c *zeroClient) UpdateMembership(ctx context.Context, in *Group, opts ...grpc.CallOption) (*api.Payload, error) {
+	out := new(api.Payload)
+	err := c.cc.Invoke(ctx, "/pb.Zero/UpdateMembership", in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
-	x := &zeroUpdateClient{stream}
+	return out, nil
+}
+
+func (c *zeroClient) StreamMembership(ctx context.Context, in *api.Payload, opts ...grpc.CallOption) (Zero_StreamMembershipClient, error) {
+	stream, err := c.cc.NewStream(ctx, &_Zero_serviceDesc.Streams[0], "/pb.Zero/StreamMembership", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &zeroStreamMembershipClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
 	return x, nil
 }
 
-type Zero_UpdateClient interface {
-	Send(*Group) error
+type Zero_StreamMembershipClient interface {
 	Recv() (*MembershipState, error)
 	grpc.ClientStream
 }
 
-type zeroUpdateClient struct {
+type zeroStreamMembershipClient struct {
 	grpc.ClientStream
 }
 
-func (x *zeroUpdateClient) Send(m *Group) error {
-	return x.ClientStream.SendMsg(m)
-}
-
-func (x *zeroUpdateClient) Recv() (*MembershipState, error) {
+func (x *zeroStreamMembershipClient) Recv() (*MembershipState, error) {
 	m := new(MembershipState)
 	if err := x.ClientStream.RecvMsg(m); err != nil {
 		return nil, err
@@ -3931,8 +3960,10 @@ func (c *zeroClient) TryAbort(ctx context.Context, in *TxnTimestamps, opts ...gr
 
 // ZeroServer is the server API for Zero service.
 type ZeroServer interface {
+	// These 3 endpoints are for handling membership.
 	Connect(context.Context, *Member) (*ConnectionState, error)
-	Update(Zero_UpdateServer) error
+	UpdateMembership(context.Context, *Group) (*api.Payload, error)
+	StreamMembership(*api.Payload, Zero_StreamMembershipServer) error
 	Oracle(*api.Payload, Zero_OracleServer) error
 	ShouldServe(context.Context, *Tablet) (*Tablet, error)
 	AssignUids(context.Context, *Num) (*AssignedIds, error)
@@ -3963,32 +3994,45 @@ func _Zero_Connect_Handler(srv interface{}, ctx context.Context, dec func(interf
 	return interceptor(ctx, in, info, handler)
 }
 
-func _Zero_Update_Handler(srv interface{}, stream grpc.ServerStream) error {
-	return srv.(ZeroServer).Update(&zeroUpdateServer{stream})
+func _Zero_UpdateMembership_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Group)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ZeroServer).UpdateMembership(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/pb.Zero/UpdateMembership",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ZeroServer).UpdateMembership(ctx, req.(*Group))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-type Zero_UpdateServer interface {
+func _Zero_StreamMembership_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(api.Payload)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(ZeroServer).StreamMembership(m, &zeroStreamMembershipServer{stream})
+}
+
+type Zero_StreamMembershipServer interface {
 	Send(*MembershipState) error
-	Recv() (*Group, error)
 	grpc.ServerStream
 }
 
-type zeroUpdateServer struct {
+type zeroStreamMembershipServer struct {
 	grpc.ServerStream
 }
 
-func (x *zeroUpdateServer) Send(m *MembershipState) error {
+func (x *zeroStreamMembershipServer) Send(m *MembershipState) error {
 	return x.ServerStream.SendMsg(m)
 }
 
-func (x *zeroUpdateServer) Recv() (*Group, error) {
-	m := new(Group)
-	if err := x.ServerStream.RecvMsg(m); err != nil {
-		return nil, err
-	}
-	return m, nil
-}
-
 func _Zero_Oracle_Handler(srv interface{}, stream grpc.ServerStream) error {
 	m := new(api.Payload)
 	if err := stream.RecvMsg(m); err != nil {
@@ -4108,6 +4152,10 @@ var _Zero_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Connect",
 			Handler:    _Zero_Connect_Handler,
 		},
+		{
+			MethodName: "UpdateMembership",
+			Handler:    _Zero_UpdateMembership_Handler,
+		},
 		{
 			MethodName: "ShouldServe",
 			Handler:    _Zero_ShouldServe_Handler,
@@ -4131,10 +4179,9 @@ var _Zero_serviceDesc = grpc.ServiceDesc{
 	},
 	Streams: []grpc.StreamDesc{
 		{
-			StreamName:    "Update",
-			Handler:       _Zero_Update_Handler,
+			StreamName:    "StreamMembership",
+			Handler:       _Zero_StreamMembership_Handler,
 			ServerStreams: true,
-			ClientStreams: true,
 		},
 		{
 			StreamName:    "Oracle",
@@ -4155,7 +4202,6 @@ type WorkerClient interface {
 	StreamSnapshot(ctx context.Context, opts ...grpc.CallOption) (Worker_StreamSnapshotClient, error)
 	Sort(ctx context.Context, in *SortMessage, opts ...grpc.CallOption) (*SortResult, error)
 	Schema(ctx context.Context, in *SchemaRequest, opts ...grpc.CallOption) (*SchemaResult, error)
-	PurgeTs(ctx context.Context, in *api.Payload, opts ...grpc.CallOption) (*Num, error)
 	Backup(ctx context.Context, in *BackupRequest, opts ...grpc.CallOption) (*Status, error)
 	Export(ctx context.Context, in *ExportRequest, opts ...grpc.CallOption) (*Status, error)
 	ReceivePredicate(ctx context.Context, opts ...grpc.CallOption) (Worker_ReceivePredicateClient, error)
@@ -4237,15 +4283,6 @@ func (c *workerClient) Schema(ctx context.Context, in *SchemaRequest, opts ...gr
 	return out, nil
 }
 
-func (c *workerClient) PurgeTs(ctx context.Context, in *api.Payload, opts ...grpc.CallOption) (*Num, error) {
-	out := new(Num)
-	err := c.cc.Invoke(ctx, "/pb.Worker/PurgeTs", in, out, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
-}
-
 func (c *workerClient) Backup(ctx context.Context, in *BackupRequest, opts ...grpc.CallOption) (*Status, error) {
 	out := new(Status)
 	err := c.cc.Invoke(ctx, "/pb.Worker/Backup", in, out, opts...)
@@ -4315,7 +4352,6 @@ type WorkerServer interface {
 	StreamSnapshot(Worker_StreamSnapshotServer) error
 	Sort(context.Context, *SortMessage) (*SortResult, error)
 	Schema(context.Context, *SchemaRequest) (*SchemaResult, error)
-	PurgeTs(context.Context, *api.Payload) (*Num, error)
 	Backup(context.Context, *BackupRequest) (*Status, error)
 	Export(context.Context, *ExportRequest) (*Status, error)
 	ReceivePredicate(Worker_ReceivePredicateServer) error
@@ -4424,24 +4460,6 @@ func _Worker_Schema_Handler(srv interface{}, ctx context.Context, dec func(inter
 	return interceptor(ctx, in, info, handler)
 }
 
-func _Worker_PurgeTs_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(api.Payload)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(WorkerServer).PurgeTs(ctx, in)
-	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/pb.Worker/PurgeTs",
-	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(WorkerServer).PurgeTs(ctx, req.(*api.Payload))
-	}
-	return interceptor(ctx, in, info, handler)
-}
-
 func _Worker_Backup_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(BackupRequest)
 	if err := dec(in); err != nil {
@@ -4542,10 +4560,6 @@ var _Worker_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Schema",
 			Handler:    _Worker_Schema_Handler,
 		},
-		{
-			MethodName: "PurgeTs",
-			Handler:    _Worker_PurgeTs_Handler,
-		},
 		{
 			MethodName: "Backup",
 			Handler:    _Worker_Backup_Handler,
@@ -5318,6 +5332,11 @@ func (m *Group) MarshalTo(dAtA []byte) (int, error) {
 			}
 		}
 	}
+	if m.SnapshotTs != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintPb(dAtA, i, uint64(m.SnapshotTs))
+	}
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -5339,6 +5358,21 @@ func (m *ZeroProposal) MarshalTo(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.SnapshotTs) > 0 {
+		for k, _ := range m.SnapshotTs {
+			dAtA[i] = 0xa
+			i++
+			v := m.SnapshotTs[k]
+			mapSize := 1 + sovPb(uint64(k)) + 1 + sovPb(uint64(v))
+			i = encodeVarintPb(dAtA, i, uint64(mapSize))
+			dAtA[i] = 0x8
+			i++
+			i = encodeVarintPb(dAtA, i, uint64(k))
+			dAtA[i] = 0x10
+			i++
+			i = encodeVarintPb(dAtA, i, uint64(v))
+		}
+	}
 	if m.Member != nil {
 		dAtA[i] = 0x12
 		i++
@@ -7519,6 +7553,9 @@ func (m *Group) Size() (n int) {
 			n += mapEntrySize + 1 + sovPb(uint64(mapEntrySize))
 		}
 	}
+	if m.SnapshotTs != 0 {
+		n += 1 + sovPb(uint64(m.SnapshotTs))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -7531,6 +7568,14 @@ func (m *ZeroProposal) Size() (n int) {
 	}
 	var l int
 	_ = l
+	if len(m.SnapshotTs) > 0 {
+		for k, v := range m.SnapshotTs {
+			_ = k
+			_ = v
+			mapEntrySize := 1 + sovPb(uint64(k)) + 1 + sovPb(uint64(v))
+			n += mapEntrySize + 1 + sovPb(uint64(mapEntrySize))
+		}
+	}
 	if m.Member != nil {
 		l = m.Member.Size()
 		n += 1 + l + sovPb(uint64(l))
@@ -10574,6 +10619,25 @@ func (m *Group) Unmarshal(dAtA []byte) error {
 			}
 			m.Tablets[mapkey] = mapvalue
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SnapshotTs", wireType)
+			}
+			m.SnapshotTs = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.SnapshotTs |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipPb(dAtA[iNdEx:])
@@ -10625,6 +10689,102 @@ func (m *ZeroProposal) Unmarshal(dAtA []byte) error {
 			return fmt.Errorf("proto: ZeroProposal: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SnapshotTs", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthPb
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.SnapshotTs == nil {
+				m.SnapshotTs = make(map[uint32]uint64)
+			}
+			var mapkey uint32
+			var mapvalue uint64
+			for iNdEx < postIndex {
+				entryPreIndex := iNdEx
+				var wire uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowPb
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					wire |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				fieldNum := int32(wire >> 3)
+				if fieldNum == 1 {
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowPb
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						mapkey |= (uint32(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+				} else if fieldNum == 2 {
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowPb
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						mapvalue |= (uint64(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+				} else {
+					iNdEx = entryPreIndex
+					skippy, err := skipPb(dAtA[iNdEx:])
+					if err != nil {
+						return err
+					}
+					if skippy < 0 {
+						return ErrInvalidLengthPb
+					}
+					if (iNdEx + skippy) > postIndex {
+						return io.ErrUnexpectedEOF
+					}
+					iNdEx += skippy
+				}
+			}
+			m.SnapshotTs[mapkey] = mapvalue
+			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Member", wireType)
@@ -16047,205 +16207,207 @@ var (
 	ErrIntOverflowPb   = fmt.Errorf("proto: integer overflow")
 )
 
-func init() { proto.RegisterFile("pb.proto", fileDescriptor_pb_1efee8619f75cb94) }
-
-var fileDescriptor_pb_1efee8619f75cb94 = []byte{
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+func init() { proto.RegisterFile("pb.proto", fileDescriptor_pb_a9faf9bf79258c83) }
+
+var fileDescriptor_pb_a9faf9bf79258c83 = []byte{
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+	0x8b, 0xfe, 0x67, 0xd7, 0x90, 0xf8, 0xb4, 0xb3, 0x3f, 0xec, 0x9a, 0xc4, 0x81, 0xc6, 0x93, 0xdd,
+	0x83, 0xad, 0x61, 0xb7, 0x46, 0x6c, 0xa8, 0x3f, 0x3a, 0x38, 0xd8, 0xed, 0xd6, 0x49, 0x1b, 0xec,
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+	0x80, 0x9f, 0xa3, 0xdd, 0xad, 0xfd, 0xa7, 0x5d, 0xd3, 0xfd, 0x57, 0xb0, 0x8f, 0x02, 0xff, 0x51,
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+	0x42, 0x3f, 0xb7, 0xa6, 0xdc, 0x7d, 0x68, 0x1e, 0x05, 0xfe, 0x21, 0xf3, 0xce, 0xc8, 0x07, 0x00,
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+	0x81, 0x85, 0x44, 0x9e, 0x66, 0xa1, 0x7b, 0xe4, 0x7b, 0x52, 0xcd, 0x73, 0xb3, 0xe2, 0xe8, 0x58,
+	0xe4, 0xdf, 0x84, 0x7a, 0xc2, 0xbc, 0x33, 0x8d, 0x4f, 0x2d, 0x3d, 0x45, 0x6e, 0x47, 0x91, 0x41,
+	0xee, 0x82, 0xad, 0x4d, 0x22, 0x5f, 0xb7, 0x55, 0xb1, 0x1d, 0x5a, 0x30, 0xe7, 0x1f, 0xab, 0xb6,
+	0xf0, 0x58, 0x5f, 0x00, 0x94, 0x3d, 0x91, 0x4b, 0x52, 0xfe, 0xeb, 0xd0, 0x60, 0x61, 0xa0, 0x2f,
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+	0x63, 0x2e, 0xd4, 0xfa, 0x38, 0x95, 0x2a, 0xa6, 0xfb, 0x09, 0x58, 0xaa, 0x01, 0x50, 0x31, 0x54,
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+	0x64, 0x94, 0xf9, 0x9f, 0x12, 0xd2, 0x7d, 0x1e, 0x14, 0x76, 0xb7, 0xc1, 0x7e, 0x6d, 0xfb, 0x4c,
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+	0xad, 0x22, 0xfd, 0xe6, 0x3e, 0xd8, 0xde, 0x69, 0x10, 0xfa, 0x29, 0x8f, 0xe6, 0x6e, 0x5d, 0xb6,
+	0x91, 0x0a, 0x3e, 0x59, 0x83, 0x3a, 0xf6, 0xba, 0x6a, 0x25, 0x6e, 0x16, 0x8d, 0x2e, 0xe4, 0xb8,
+	0xc7, 0xd0, 0x51, 0x21, 0x94, 0xf2, 0xff, 0x99, 0x72, 0xf1, 0xda, 0xc4, 0x6c, 0x15, 0xa0, 0x40,
+	0xf9, 0xbc, 0x6b, 0x57, 0x19, 0x91, 0xa6, 0x7c, 0x12, 0xf0, 0xd0, 0xcf, 0x6f, 0xa3, 0x29, 0xf7,
+	0x4b, 0x68, 0xe7, 0x7b, 0xe8, 0xde, 0x41, 0x1e, 0xc8, 0x95, 0x36, 0x55, 0x39, 0xa3, 0x44, 0xf6,
+	0x63, 0xbf, 0x88, 0xe3, 0xee, 0x1f, 0xcc, 0x7c, 0xa6, 0x2e, 0xa3, 0xe7, 0x52, 0x43, 0x63, 0x31,
+	0x35, 0x9c, 0x4f, 0xb3, 0xcc, 0x1f, 0x95, 0x66, 0x7d, 0x05, 0x8e, 0x8f, 0xb9, 0x46, 0x70, 0x9e,
+	0xe3, 0xea, 0xca, 0x62, 0x5e, 0xa1, 0xb3, 0x91, 0xe0, 0x9c, 0xd3, 0x52, 0x58, 0x9e, 0x25, 0x8b,
+	0xcf, 0x78, 0x14, 0xbc, 0xc0, 0x3e, 0x81, 0xbc, 0x70, 0x39, 0x50, 0x36, 0x5d, 0x54, 0xfe, 0xa1,
+	0x9b, 0x2e, 0x79, 0xff, 0xc8, 0x2a, 0xfb, 0x47, 0x52, 0x6b, 0xd3, 0x44, 0xf0, 0x34, 0xcb, 0xf3,
+	0x50, 0x45, 0x15, 0xf9, 0x9c, 0xa3, 0x65, 0x59, 0x34, 0x76, 0x1f, 0x82, 0x53, 0x9c, 0x45, 0x02,
+	0xda, 0xfe, 0xc1, 0x7e, 0x5f, 0xc1, 0xcf, 0xce, 0xfe, 0x76, 0xff, 0x3f, 0xba, 0x86, 0x84, 0x44,
+	0xda, 0x7f, 0xde, 0xa7, 0x83, 0x7e, 0xd7, 0x94, 0xd0, 0xb5, 0xdd, 0xdf, 0xed, 0x0f, 0xfb, 0xdd,
+	0xda, 0x37, 0x75, 0xbb, 0xd9, 0xb5, 0xa9, 0xcd, 0x67, 0x49, 0x18, 0x78, 0x41, 0xe6, 0x1e, 0x81,
+	0xbd, 0xc7, 0x92, 0x57, 0x6a, 0x8a, 0x32, 0xd2, 0x4d, 0x75, 0xaf, 0x44, 0x47, 0xa5, 0xdb, 0xd0,
+	0xd4, 0x2e, 0xaf, 0xad, 0x69, 0x0e, 0x0e, 0x72, 0x9e, 0xfb, 0x4b, 0x03, 0xae, 0xef, 0xc5, 0xe7,
+	0xbc, 0x08, 0xfc, 0x87, 0xec, 0x22, 0x8c, 0x99, 0xff, 0x86, 0xa7, 0xbb, 0x03, 0xd7, 0x44, 0x3c,
+	0x4d, 0x3d, 0x3e, 0x5a, 0xe8, 0xd3, 0x74, 0xd4, 0xf0, 0x53, 0x6d, 0x82, 0x2e, 0x74, 0x7c, 0x2e,
+	0xb2, 0x52, 0xaa, 0x86, 0x52, 0x2d, 0x39, 0x98, 0xcb, 0x14, 0xd9, 0x4b, 0xfd, 0x4d, 0xd9, 0x8b,
+	0xfb, 0x18, 0x9c, 0xe1, 0x0c, 0x8b, 0xa1, 0xa9, 0x98, 0x0b, 0x48, 0xc6, 0x6b, 0x02, 0x92, 0xb9,
+	0x80, 0x71, 0x03, 0x68, 0x55, 0xd2, 0x16, 0xf2, 0x21, 0xd4, 0xb3, 0x59, 0x34, 0xdf, 0x6f, 0xcd,
+	0xf7, 0xa0, 0xc8, 0x22, 0x1f, 0x42, 0x5b, 0x16, 0x4a, 0x4c, 0x88, 0x60, 0x1c, 0x71, 0x5f, 0xaf,
+	0x28, 0x8b, 0xa7, 0x2d, 0x3d, 0xe4, 0xde, 0x84, 0x8e, 0xac, 0x4c, 0x83, 0x09, 0x17, 0x19, 0x9b,
+	0x24, 0x18, 0x3e, 0x35, 0x6a, 0xd5, 0xa9, 0x99, 0x09, 0xf7, 0x0e, 0xb4, 0x0f, 0x39, 0x4f, 0x29,
+	0x17, 0x49, 0x1c, 0xa9, 0x38, 0x22, 0x70, 0x0f, 0x0d, 0x91, 0x9a, 0x72, 0xbf, 0x07, 0x47, 0x26,
+	0x9e, 0x8f, 0x58, 0xe6, 0x9d, 0xfe, 0x94, 0xc4, 0xf4, 0x0e, 0x34, 0x13, 0xf5, 0x74, 0x3a, 0x8d,
+	0x6c, 0xa3, 0x97, 0xea, 0xe7, 0xa4, 0x39, 0xd3, 0xfd, 0x02, 0x6a, 0xfb, 0xd3, 0x49, 0xf5, 0xdf,
+	0x87, 0xba, 0x4a, 0x8d, 0xe6, 0x4a, 0x32, 0x73, 0xbe, 0x24, 0x73, 0xbf, 0x83, 0x56, 0x7e, 0xd5,
+	0x1d, 0x1f, 0xff, 0x42, 0x40, 0x55, 0xef, 0xf8, 0x73, 0x9a, 0x57, 0xb5, 0x0e, 0x8f, 0xfc, 0x9d,
+	0x5c, 0x47, 0x8a, 0x98, 0x5f, 0x5b, 0xd7, 0xf2, 0xc5, 0xda, 0x4f, 0xa0, 0x9d, 0x27, 0x87, 0x98,
+	0x87, 0xc9, 0xc7, 0x0b, 0x03, 0x1e, 0x55, 0x1e, 0xd6, 0x56, 0x03, 0x43, 0xf1, 0x9a, 0xce, 0xa0,
+	0xbb, 0x01, 0x96, 0xb6, 0x0c, 0x02, 0x75, 0x2f, 0xf6, 0x95, 0xd9, 0x36, 0x28, 0x7e, 0xcb, 0x0b,
+	0x4f, 0xc4, 0x38, 0x87, 0xf2, 0x89, 0x18, 0xbb, 0x19, 0x74, 0x1e, 0x31, 0xef, 0x6c, 0x9a, 0xe4,
+	0x50, 0x5a, 0xc9, 0xe2, 0x8d, 0xb9, 0x2c, 0xfe, 0x35, 0xed, 0xc8, 0x77, 0xa0, 0x39, 0x8d, 0x82,
+	0x59, 0x1e, 0x4b, 0x1d, 0x6a, 0x49, 0x72, 0x88, 0xe0, 0x9a, 0xb1, 0x74, 0xac, 0xfb, 0xb5, 0x0e,
+	0xd5, 0x94, 0xfb, 0x5f, 0xd0, 0xe9, 0xcf, 0x12, 0x6c, 0xcc, 0xbe, 0x11, 0xc0, 0x2b, 0x07, 0x32,
+	0xe7, 0x0e, 0xb4, 0xb0, 0x6b, 0x2d, 0xdf, 0x75, 0xf3, 0x37, 0x06, 0xd4, 0xa5, 0x79, 0x90, 0x5b,
+	0x50, 0xef, 0x7b, 0xa7, 0x31, 0x99, 0xb3, 0x82, 0x95, 0x39, 0xca, 0x5d, 0x22, 0x9f, 0xa8, 0x66,
+	0x6f, 0xde, 0xc3, 0xee, 0xe4, 0xd6, 0x85, 0xd6, 0xf7, 0x8a, 0xf4, 0x06, 0xb4, 0xbe, 0x89, 0x83,
+	0xe8, 0xb1, 0xea, 0x7f, 0x92, 0x45, 0x5b, 0x7c, 0x45, 0xfe, 0x53, 0xb0, 0x76, 0x84, 0x34, 0xfa,
+	0x57, 0x45, 0xb1, 0x16, 0xac, 0xfa, 0x83, 0xbb, 0xb4, 0xf9, 0xab, 0x1a, 0xd4, 0xbf, 0xe3, 0x69,
+	0x4c, 0x3e, 0x81, 0xa6, 0xee, 0x7c, 0x90, 0x4a, 0x87, 0x63, 0x05, 0x81, 0x61, 0xa1, 0x25, 0x82,
+	0xbb, 0x74, 0x15, 0xec, 0x97, 0x98, 0x41, 0xca, 0xc6, 0xcc, 0x2b, 0x87, 0x7a, 0x08, 0xdd, 0x41,
+	0x96, 0x72, 0x36, 0xa9, 0x88, 0xcf, 0x2b, 0xe9, 0x32, 0x00, 0x72, 0x97, 0x1e, 0x18, 0xe4, 0x63,
+	0xb0, 0x14, 0x70, 0x2c, 0x4c, 0x58, 0xac, 0x84, 0x50, 0xf8, 0x2e, 0xb4, 0x06, 0xa7, 0xf1, 0x34,
+	0xf4, 0x07, 0x3c, 0x3d, 0xe7, 0xa4, 0xd2, 0x7d, 0x5c, 0xa9, 0x7c, 0xbb, 0x4b, 0x64, 0x1d, 0x40,
+	0xb9, 0xd6, 0x51, 0xe0, 0x0b, 0xd2, 0x94, 0xbc, 0xfd, 0xe9, 0x44, 0x2d, 0x5a, 0xf1, 0x39, 0x25,
+	0x59, 0x01, 0x98, 0xd7, 0x49, 0x7e, 0x0e, 0x9d, 0xc7, 0x08, 0x77, 0x07, 0xe9, 0xd6, 0x71, 0x9c,
+	0x66, 0x64, 0xb1, 0x03, 0xb9, 0xb2, 0x38, 0xe0, 0x2e, 0x91, 0x07, 0x60, 0x0f, 0xd3, 0x0b, 0x25,
+	0xff, 0x96, 0x86, 0xc1, 0x72, 0xbf, 0x4b, 0x6e, 0xb9, 0xf9, 0xf3, 0x1a, 0x58, 0xdf, 0xc6, 0xe9,
+	0x19, 0x4f, 0xc9, 0x7d, 0xb0, 0xb0, 0x64, 0xd5, 0x46, 0x54, 0x94, 0xaf, 0x97, 0x6d, 0x74, 0x0b,
+	0x1c, 0x54, 0xca, 0x90, 0x89, 0x33, 0xf5, 0x54, 0xf8, 0xa7, 0xa3, 0xd2, 0x8b, 0xca, 0x39, 0xf0,
+	0x5d, 0x97, 0xd5, 0x43, 0x15, 0x65, 0xfa, 0x5c, 0x1d, 0xb9, 0xd2, 0x54, 0x45, 0xe1, 0xc0, 0x5d,
+	0x5a, 0x37, 0x1e, 0x18, 0xe4, 0x1e, 0xd4, 0x07, 0xea, 0xa6, 0x52, 0xa8, 0xfc, 0x63, 0x66, 0x65,
+	0x39, 0x1f, 0x28, 0x56, 0xfe, 0x67, 0xb0, 0x54, 0xba, 0xa0, 0xae, 0x39, 0x97, 0x4f, 0xad, 0x74,
+	0xab, 0x43, 0x7a, 0xc2, 0x3d, 0xb0, 0x14, 0x52, 0xa8, 0x09, 0x73, 0xa8, 0xa1, 0x4e, 0xad, 0x80,
+	0x47, 0x89, 0x2a, 0xf7, 0x56, 0xa2, 0x73, 0xae, 0xbe, 0x20, 0xfa, 0x29, 0x74, 0x29, 0xf7, 0x78,
+	0x50, 0x09, 0xbe, 0x24, 0xbf, 0xd4, 0xa2, 0xd9, 0xae, 0x1b, 0xe4, 0x21, 0x74, 0xe6, 0x02, 0x35,
+	0xe9, 0xa1, 0xa2, 0x2f, 0x89, 0xdd, 0x8b, 0x93, 0x1f, 0x75, 0x7f, 0xf7, 0x72, 0xd5, 0xf8, 0xfd,
+	0xcb, 0x55, 0xe3, 0x8f, 0x2f, 0x57, 0x8d, 0x1f, 0xfe, 0xb4, 0xba, 0x74, 0x6c, 0xe1, 0x9f, 0xd5,
+	0x9f, 0xff, 0x2d, 0x00, 0x00, 0xff, 0xff, 0x26, 0xdd, 0xb7, 0xb3, 0xc7, 0x1e, 0x00, 0x00,
 }
diff --git a/worker/draft.go b/worker/draft.go
index a094b6a1332..7b67c221058 100644
--- a/worker/draft.go
+++ b/worker/draft.go
@@ -115,11 +115,10 @@ func (h *header) Decode(in []byte) {
 }
 
 func (n *node) Ctx(key string) context.Context {
-	ctx := context.Background()
 	if pctx := n.Proposals.Get(key); pctx != nil {
-		ctx = pctx.Ctx
+		return pctx.Ctx
 	}
-	return ctx
+	return context.Background()
 }
 
 func (n *node) applyConfChange(e raftpb.Entry) {
@@ -159,9 +158,8 @@ func detectPendingTxns(attr string) error {
 // We don't support schema mutations across nodes in a transaction.
 // Wait for all transactions to either abort or complete and all write transactions
 // involving the predicate are aborted until schema mutations are done.
-func (n *node) applyMutations(proposal *pb.Proposal) error {
-	tr := trace.New("Dgraph.Node", "ApplyMutations")
-	defer tr.Finish()
+func (n *node) applyMutations(ctx context.Context, proposal *pb.Proposal) error {
+	span := otrace.FromContext(ctx)
 
 	if proposal.Mutations.DropAll {
 		// Ensures nothing get written to disk due to commit proposals.
@@ -173,14 +171,10 @@ func (n *node) applyMutations(proposal *pb.Proposal) error {
 	if proposal.Mutations.StartTs == 0 {
 		return errors.New("StartTs must be provided.")
 	}
-
 	startTs := proposal.Mutations.StartTs
-	ctx := n.Ctx(proposal.Key)
-	ctx, span := otrace.StartSpan(ctx, "node.applyMutations")
-	defer span.End()
 
 	if len(proposal.Mutations.Schema) > 0 {
-		tr.LazyPrintf("Applying Schema")
+		span.Annotatef(nil, "Applying schema")
 		for _, supdate := range proposal.Mutations.Schema {
 			// This is neceassry to ensure that there is no race between when we start reading
 			// from badger and new mutation getting commited via raft and getting applied.
@@ -213,19 +207,17 @@ func (n *node) applyMutations(proposal *pb.Proposal) error {
 	schemaMap := make(map[string]types.TypeID)
 	for _, edge := range proposal.Mutations.Edges {
 		if tablet := groups().Tablet(edge.Attr); tablet != nil && tablet.ReadOnly {
-			tr.LazyPrintf("Predicate Moving")
-			tr.SetError()
+			span.Annotatef(nil, "Tablet moving: %+v. Retry later.", tablet)
 			return errPredicateMoving
 		}
 		if edge.Entity == 0 && bytes.Equal(edge.Value, []byte(x.Star)) {
 			// We should only drop the predicate if there is no pending
 			// transaction.
 			if err := detectPendingTxns(edge.Attr); err != nil {
-				tr.LazyPrintf("Found pending transactions which obstruct operation.")
-				tr.SetError()
+				span.Annotatef(nil, "Found pending transactions. Retry later.")
 				return err
 			}
-			tr.LazyPrintf("Deleting predicate")
+			span.Annotatef(nil, "Deleting predicate: %s", edge.Attr)
 			return posting.DeletePredicate(ctx, edge.Attr)
 		}
 		// Dont derive schema when doing deletion.
@@ -254,12 +246,10 @@ func (n *node) applyMutations(proposal *pb.Proposal) error {
 	m := proposal.Mutations
 	txn := posting.Oracle().RegisterStartTs(m.StartTs)
 	if txn.ShouldAbort() {
-		tr.LazyPrintf("Should Abort")
-		tr.SetError()
+		span.Annotatef(nil, "Txn %d should abort.", m.StartTs)
 		return dy.ErrConflict
 	}
 
-	tr.LazyPrintf("Applying %d edges", len(m.Edges))
 	span.Annotatef(nil, "To apply: %d edges", len(m.Edges))
 	var retries int
 	for _, edge := range m.Edges {
@@ -269,7 +259,6 @@ func (n *node) applyMutations(proposal *pb.Proposal) error {
 				break
 			}
 			if err != posting.ErrRetry {
-				tr.SetError()
 				return err
 			}
 			retries++
@@ -278,20 +267,26 @@ func (n *node) applyMutations(proposal *pb.Proposal) error {
 	if retries > 0 {
 		span.Annotatef(nil, "retries=true num=%d", retries)
 	}
-	tr.LazyPrintf("Done applying %d edges", len(m.Edges))
 	return nil
 }
 
 func (n *node) applyCommitted(proposal *pb.Proposal) error {
-	if proposal.Mutations != nil {
-		// syncmarks for this shouldn't be marked done until it's comitted.
-		n.elog.Printf("Applying mutations for key: %s", proposal.Key)
-		return n.applyMutations(proposal)
-	}
-
 	ctx := n.Ctx(proposal.Key)
 	ctx, span := otrace.StartSpan(ctx, "node.applyCommitted")
 	defer span.End()
+	span.Annotatef(nil, "Node id: %d. Group id: %d. Got proposal key: %s",
+		n.Id, n.gid, proposal.Key)
+
+	if proposal.Mutations != nil {
+		// syncmarks for this shouldn't be marked done until it's comitted.
+		span.Annotate(nil, "Applying mutations")
+		if err := n.applyMutations(ctx, proposal); err != nil {
+			span.Annotatef(nil, "While applying mutations: %v", err)
+			return err
+		}
+		span.Annotate(nil, "Done")
+		return nil
+	}
 
 	switch {
 	case len(proposal.Kv) > 0:
@@ -856,12 +851,12 @@ func (n *node) rollupLists(readTs uint64) error {
 	return nil
 }
 
-var errConnection = errors.New("No connection exists")
+var errNoConnection = errors.New("No connection exists")
 
 func (n *node) blockingAbort(req *pb.TxnTimestamps) error {
 	pl := groups().Leader(0)
 	if pl == nil {
-		return errConnection
+		return errNoConnection
 	}
 	zc := pb.NewZeroClient(pl.Get())
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
diff --git a/worker/groups.go b/worker/groups.go
index 6aaf2c3fa41..688d06b72aa 100644
--- a/worker/groups.go
+++ b/worker/groups.go
@@ -97,7 +97,7 @@ func StartRaftNodes(walStore *badger.DB, bindall bool) {
 	var connState *pb.ConnectionState
 	var err error
 	for { // Keep on retrying. See: https://github.com/dgraph-io/dgraph/issues/2289
-		pl := gr.connToZeroLeader(Config.ZeroAddr)
+		pl := gr.connToZeroLeader()
 		if pl == nil {
 			continue
 		}
@@ -129,12 +129,14 @@ func StartRaftNodes(walStore *badger.DB, bindall bool) {
 	x.Checkf(schema.LoadFromDb(), "Error while initializing schema")
 	raftServer.Node = gr.Node.Node
 	gr.Node.InitAndStartNode()
-
 	x.UpdateHealthStatus(true)
-	gr.closer = y.NewCloser(3)       // Match CLOSER:1 in this file.
-	go gr.periodicMembershipUpdate() // Now set it to be run periodically.
+
+	gr.closer = y.NewCloser(4) // Match CLOSER:1 in this file.
+	go gr.sendMembershipUpdates()
+	go gr.receiveMembershipUpdates()
 	go gr.cleanupTablets()
 	go gr.processOracleDeltaStream()
+
 	gr.proposeInitialSchema()
 }
 
@@ -303,14 +305,7 @@ func (g *groupi) ServesGroup(gid uint32) bool {
 }
 
 func (g *groupi) BelongsTo(key string) uint32 {
-	g.RLock()
-	tablet, ok := g.tablets[key]
-	g.RUnlock()
-
-	if ok {
-		return tablet.GroupId
-	}
-	tablet = g.Tablet(key)
+	tablet := g.Tablet(key)
 	if tablet != nil {
 		return tablet.GroupId
 	}
@@ -345,10 +340,7 @@ func (g *groupi) Tablet(key string) *pb.Tablet {
 
 	// We don't know about this tablet.
 	// Check with dgraphzero if we can serve it.
-	pl := g.Leader(0)
-	if pl == nil {
-		return nil
-	}
+	pl := g.connToZeroLeader()
 	zc := pb.NewZeroClient(pl.Get())
 
 	tablet = &pb.Tablet{GroupId: g.groupId(), Predicate: key}
@@ -487,13 +479,30 @@ func (g *groupi) triggerMembershipSync() {
 
 const connBaseDelay = 100 * time.Millisecond
 
-func (g *groupi) connToZeroLeader(addr string) *conn.Pool {
+func (g *groupi) connToZeroLeader() *conn.Pool {
 	pl := g.Leader(0)
 	if pl != nil {
 		return pl
 	}
 	glog.V(1).Infof("No healthy Zero leader found. Trying to find a Zero leader...")
 
+	getLeaderConn := func(zc pb.ZeroClient) *conn.Pool {
+		ctx, cancel := context.WithTimeout(gr.ctx, 10*time.Second)
+		defer cancel()
+
+		connState, err := zc.Connect(ctx, &pb.Member{ClusterInfoOnly: true})
+		if err != nil || connState == nil {
+			glog.V(1).Infof("While retrieving Zero leader info. Error: %v. Retrying...", err)
+			return nil
+		}
+		for _, mz := range connState.State.GetZeros() {
+			if mz.Leader {
+				return conn.Get().Connect(mz.GetAddr())
+			}
+		}
+		return nil
+	}
+
 	// No leader found. Let's get the latest membership state from Zero.
 	delay := connBaseDelay
 	maxHalfDelay := time.Second
@@ -502,50 +511,141 @@ func (g *groupi) connToZeroLeader(addr string) *conn.Pool {
 		if delay <= maxHalfDelay {
 			delay *= 2
 		}
-		var pl *conn.Pool
-		if len(addr) > 0 {
-			pl = conn.Get().Connect(addr)
-		}
+		pl := g.AnyServer(0)
 		if pl == nil {
-			pl = g.AnyServer(0)
-			if pl == nil {
-				glog.V(1).Infof("No healthy Zero server found. Retrying...")
-				continue
-			}
+			pl = conn.Get().Connect(Config.ZeroAddr)
 		}
-		zc := pb.NewZeroClient(pl.Get())
-		connState, err := zc.Connect(gr.ctx, &pb.Member{ClusterInfoOnly: true})
-		if err != nil || connState == nil {
-			glog.V(1).Infof("While retrieving Zero leader info. Error: %v. Retrying...", err)
+		if pl == nil {
+			glog.V(1).Infof("No healthy Zero server found. Retrying...")
 			continue
 		}
-		for _, mz := range connState.State.GetZeros() {
-			if mz.Leader {
-				pl := conn.Get().Connect(mz.GetAddr())
-				return pl
-			}
+		zc := pb.NewZeroClient(pl.Get())
+		if pl := getLeaderConn(zc); pl != nil {
+			return pl
 		}
 		glog.V(1).Infof("Unable to connect to a healthy Zero leader. Retrying...")
 	}
 }
 
-// TODO: This function needs to be refactored into smaller functions. It gets hard to reason about.
-// TODO: The updates have to be sent to Zero leader. But, the membership update receives can be from
-// any Zero server. Let's break that up into two different endpoints.
-func (g *groupi) periodicMembershipUpdate() {
-	defer g.closer.Done() // CLOSER:1
+func (g *groupi) doSendMembership(tablets map[string]*pb.Tablet) error {
+	leader := g.Node.AmLeader()
+	member := &pb.Member{
+		Id:         Config.RaftId,
+		GroupId:    g.groupId(),
+		Addr:       Config.MyAddr,
+		Leader:     leader,
+		LastUpdate: uint64(time.Now().Unix()),
+	}
+	group := &pb.Group{
+		Members: make(map[uint64]*pb.Member),
+	}
+	group.Members[member.Id] = member
+	if leader {
+		// Do not send tablet information, if I'm not the leader.
+		group.Tablets = tablets
+		if snap, err := g.Node.Snapshot(); err == nil {
+			group.SnapshotTs = snap.ReadTs
+		}
+	}
 
-	// Node might not be the leader when we are calculating size.
-	// We need to send immediately on start so no leader check inside calculatesize.
-	tablets := g.calculateTabletSizes()
+	pl := g.connToZeroLeader()
+	if pl == nil {
+		return errNoConnection
+	}
+	c := pb.NewZeroClient(pl.Get())
+	ctx, cancel := context.WithTimeout(g.ctx, 10*time.Second)
+	defer cancel()
+	reply, err := c.UpdateMembership(ctx, group)
+	if err != nil {
+		return err
+	}
+	if string(reply.GetData()) == "OK" {
+		return nil
+	}
+	return x.Errorf(string(reply.GetData()))
+}
+
+// sendMembershipUpdates sends the membership update to Zero leader. If this Alpha is the leader, it
+// would also calculate the tablet sizes and send them to Zero.
+func (g *groupi) sendMembershipUpdates() {
+	defer g.closer.Done() // CLOSER:1
 
 	// Calculating tablet sizes is expensive, hence we do it only every 5 mins.
 	slowTicker := time.NewTicker(time.Minute * 5)
 	defer slowTicker.Stop()
 
-	fastTicker := time.NewTicker(10 * time.Second)
+	fastTicker := time.NewTicker(time.Second)
 	defer fastTicker.Stop()
 
+	consumeTriggers := func() {
+		for {
+			select {
+			case <-g.triggerCh:
+			default:
+				return
+			}
+		}
+	}
+
+	g.triggerMembershipSync() // Ticker doesn't start immediately
+	var lastSent time.Time
+	for {
+		select {
+		case <-g.closer.HasBeenClosed():
+			return
+		case <-fastTicker.C:
+			if time.Since(lastSent) > 10*time.Second {
+				// On start of node if it becomes a leader, we would send tablets size for sure.
+				g.triggerMembershipSync()
+			}
+		case <-g.triggerCh:
+			// Let's send update even if not leader, zero will know that this node is still active.
+			// We don't need to send tablet information everytime. So, let's only send it when we
+			// calculate it.
+			consumeTriggers()
+			if err := g.doSendMembership(nil); err != nil {
+				glog.Errorf("While sending membership update: %v", err)
+			} else {
+				lastSent = time.Now()
+			}
+		case <-slowTicker.C:
+			if !g.Node.AmLeader() {
+				break // breaks select case, not for loop.
+			}
+			tablets := g.calculateTabletSizes()
+			g.RLock()
+			for attr := range g.tablets {
+				if tablets[attr] == nil {
+					// Found an attribute, which is present in the group state by Zero, but not on
+					// disk. So, we can do some cleanup here by asking Zero to remove this predicate
+					// from the group's state.
+					tablets[attr] = &pb.Tablet{
+						GroupId:   g.gid,
+						Predicate: attr,
+						Remove:    true,
+					}
+					glog.Warningf("Removing tablet: %+v", tablets[attr])
+				}
+			}
+			g.RUnlock()
+			if err := g.doSendMembership(tablets); err != nil {
+				glog.Errorf("While sending membership update with tablet: %v", err)
+			} else {
+				lastSent = time.Now()
+			}
+		}
+	}
+}
+
+// receiveMembershipUpdates receives membership updates from ANY Zero server. This is the main
+// connection which tells Alpha about the state of the cluster, including the latest Zero leader.
+// All the other connections to Zero, are only made only to the leader.
+func (g *groupi) receiveMembershipUpdates() {
+	defer g.closer.Done() // CLOSER:1
+
+	ticker := time.NewTicker(10 * time.Second)
+	defer ticker.Stop()
+
 START:
 	select {
 	case <-g.closer.HasBeenClosed():
@@ -553,7 +653,7 @@ START:
 	default:
 	}
 
-	pl := g.connToZeroLeader("")
+	pl := g.connToZeroLeader()
 	// We should always have some connection to dgraphzero.
 	if pl == nil {
 		glog.Warningln("Membership update: No Zero server known.")
@@ -564,7 +664,7 @@ START:
 
 	c := pb.NewZeroClient(pl.Get())
 	ctx, cancel := context.WithCancel(context.Background())
-	stream, err := c.Update(ctx)
+	stream, err := c.StreamMembership(ctx, &api.Payload{})
 	if err != nil {
 		glog.Errorf("Error while calling update %v\n", err)
 		time.Sleep(time.Second)
@@ -601,7 +701,6 @@ START:
 	}()
 
 	lastRecv := time.Now()
-	g.triggerMembershipSync() // Ticker doesn't start immediately
 OUTER:
 	for {
 		select {
@@ -614,63 +713,16 @@ OUTER:
 		case state := <-stateCh:
 			lastRecv = time.Now()
 			g.applyState(state)
-		case <-fastTicker.C:
+		case <-ticker.C:
 			if time.Since(lastRecv) > 10*time.Second {
 				// Zero might have gone under partition. We should recreate our connection.
 				glog.Warningf("No membership update for 10s. Closing connection to Zero.")
 				stream.CloseSend()
-				cancel()
-				break OUTER
-			}
-		case <-g.triggerCh:
-			if !g.Node.AmLeader() {
-				tablets = nil
-			}
-			// On start of node if it becomes a leader, we would send tablets size for sure.
-			if err := g.sendMembership(tablets, stream); err != nil {
-				stream.CloseSend()
-				break OUTER
-			}
-		case <-slowTicker.C:
-			// TODO: Zero should have two different RPCs. One for receiving updates, and one for
-			// sending updates.
-
-			// dgraphzero just adds to the map so check that no data is present for the tablet
-			// before we remove it to avoid the race condition where a tablet is added recently
-			// and mutation has not been persisted to disk.
-			var allTablets map[string]*pb.Tablet
-			if g.Node.AmLeader() {
-				prevTablets := tablets
-				tablets = g.calculateTabletSizes()
-				if prevTablets != nil {
-					allTablets = make(map[string]*pb.Tablet)
-					g.RLock()
-					for attr := range g.tablets {
-						if tablets[attr] == nil && prevTablets[attr] == nil {
-							allTablets[attr] = &pb.Tablet{
-								GroupId:   g.gid,
-								Predicate: attr,
-								Remove:    true,
-							}
-						}
-					}
-					g.RUnlock()
-					for attr, tab := range tablets {
-						allTablets[attr] = tab
-					}
-				} else {
-					allTablets = tablets
-				}
-			}
-			// Let's send update even if not leader, zero will know that this node is still
-			// active.
-			if err := g.sendMembership(allTablets, stream); err != nil {
-				glog.Errorf("Error while updating tablets size %v\n", err)
-				stream.CloseSend()
 				break OUTER
 			}
 		}
 	}
+	cancel()
 	goto START
 }
 
@@ -754,27 +806,6 @@ func (g *groupi) cleanupTablets() {
 	}
 }
 
-func (g *groupi) sendMembership(tablets map[string]*pb.Tablet,
-	stream pb.Zero_UpdateClient) error {
-	leader := g.Node.AmLeader()
-	member := &pb.Member{
-		Id:         Config.RaftId,
-		GroupId:    g.groupId(),
-		Addr:       Config.MyAddr,
-		Leader:     leader,
-		LastUpdate: uint64(time.Now().Unix()),
-	}
-	group := &pb.Group{
-		Members: make(map[uint64]*pb.Member),
-	}
-	group.Members[member.Id] = member
-	if leader {
-		group.Tablets = tablets
-	}
-
-	return stream.Send(group)
-}
-
 // processOracleDeltaStream is used to process oracle delta stream from Zero.
 // Zero sends information about aborted/committed transactions and maxPending.
 func (g *groupi) processOracleDeltaStream() {
@@ -888,7 +919,7 @@ func (g *groupi) processOracleDeltaStream() {
 			sort.Slice(delta.Txns, func(i, j int) bool {
 				return delta.Txns[i].CommitTs < delta.Txns[j].CommitTs
 			})
-			if glog.V(2) {
+			if glog.V(3) {
 				glog.Infof("Batched %d updates. Max Assigned: %d. Proposing Deltas:",
 					batch, delta.MaxAssigned)
 				for _, txn := range delta.Txns {
diff --git a/worker/mutation.go b/worker/mutation.go
index 176ff729a2b..30982d42f7c 100644
--- a/worker/mutation.go
+++ b/worker/mutation.go
@@ -58,7 +58,7 @@ func runMutation(ctx context.Context, edge *pb.DirectedEdge, txn *posting.Txn) e
 	if !groups().ServesTabletRW(edge.Attr) {
 		// Don't assert, can happen during replay of raft logs if server crashes immediately
 		// after predicate move and before snapshot.
-		return errUnservedTablet
+		return x.Errorf("runMutation: Tablet isn't being served by this group.")
 	}
 
 	su, ok := schema.State().Get(edge.Attr)
@@ -116,7 +116,8 @@ func runSchemaMutation(ctx context.Context, update *pb.SchemaUpdate, startTs uin
 func runSchemaMutationHelper(ctx context.Context, update *pb.SchemaUpdate, startTs uint64) error {
 	n := groups().Node
 	if !groups().ServesTablet(update.Predicate) {
-		return errUnservedTablet
+		tablet := groups().Tablet(update.Predicate)
+		return x.Errorf("Tablet isn't being served by this group. Tablet: %+v", tablet)
 	}
 	if err := checkSchema(update); err != nil {
 		return err
@@ -526,6 +527,8 @@ func MutateOverNetwork(ctx context.Context, m *pb.Mutations) (*api.TxnContext, e
 	resCh := make(chan res, len(mutationMap))
 	for gid, mu := range mutationMap {
 		if gid == 0 {
+			span.Annotatef(nil, "state: %+v", groups().state)
+			span.Annotatef(nil, "Group id zero for mutation: %+v", mu)
 			return tctx, errUnservedTablet
 		}
 		mu.StartTs = m.StartTs
@@ -578,13 +581,6 @@ func CommitOverNetwork(ctx context.Context, tc *api.TxnContext) (uint64, error)
 	return tctx.CommitTs, nil
 }
 
-func (w *grpcWorker) PurgeTs(ctx context.Context,
-	payload *api.Payload) (*pb.Num, error) {
-	n := &pb.Num{}
-	n.Val = posting.Oracle().PurgeTs()
-	return n, nil
-}
-
 // Mutate is used to apply mutations over the network on other instances.
 func (w *grpcWorker) Mutate(ctx context.Context, m *pb.Mutations) (*api.TxnContext, error) {
 	txnCtx := &api.TxnContext{}