Add EmergencyLeaderTimeout parameter, ignore throttling nodes, implement NodeRecoverTimeout, introduce processNodeMap in cluster DB

app/api/api.go

@@ -480,6 +480,7 @@ func (a *api) start() error {
 			Peers:                  peers,
 			SyncInterval:           time.Duration(cfg.Cluster.SyncInterval) * time.Second,
 			NodeRecoverTimeout:     time.Duration(cfg.Cluster.NodeRecoverTimeout) * time.Second,
+			EmergencyLeaderTimeout: time.Duration(cfg.Cluster.EmergencyLeaderTimeout) * time.Second,
 			CoreAPIAddress:         scheme + gonet.JoinHostPort(host, port),
 			CoreAPIUsername:        cfg.API.Auth.Username,
 			CoreAPIPassword:        cfg.API.Auth.Password,

cluster/cluster.go

@@ -82,6 +82,7 @@ type ClusterConfig struct {
 
 	SyncInterval           time.Duration // Interval between aligning the process in the cluster DB with the processes on the nodes
 	NodeRecoverTimeout     time.Duration // Timeout for a node to recover before rebalancing the processes
+	EmergencyLeaderTimeout time.Duration // Timeout for establishing the emergency leadership after lost contact to raft leader
 
 	CoreAPIAddress  string // Address of the core API
 	CoreAPIUsername string // Username for the core API
@@ -115,6 +116,7 @@ type cluster struct {
 
 	syncInterval           time.Duration
 	nodeRecoverTimeout     time.Duration
+	emergencyLeaderTimeout time.Duration
 
 	forwarder forwarder.Forwarder
 	api       API
@@ -145,6 +147,7 @@ func New(config ClusterConfig) (Cluster, error) {
 
 		syncInterval:           config.SyncInterval,
 		nodeRecoverTimeout:     config.NodeRecoverTimeout,
+		emergencyLeaderTimeout: config.EmergencyLeaderTimeout,
 
 		nodes: map[string]proxy.Node{},
 	}
@@ -971,15 +974,15 @@ func (c *cluster) sentinel() {
 
 			c.logger.Debug().WithFields(log.Fields{
 				"state":        stats.State,
-				"last_contact": stats.LastContact.String(),
+				"last_contact": stats.LastContact,
 				"num_peers":    stats.NumPeers,
 			}).Log("Stats")
 
-			if stats.LastContact > 10*time.Second && !isEmergencyLeader {
+			if stats.LastContact > c.emergencyLeaderTimeout && !isEmergencyLeader {
 				c.logger.Warn().Log("Force leadership due to lost contact to leader")
 				c.raftEmergencyNotifyCh <- true
 				isEmergencyLeader = true
-			} else if stats.LastContact <= 10*time.Second && isEmergencyLeader {
+			} else if stats.LastContact <= c.emergencyLeaderTimeout && isEmergencyLeader {
 				c.logger.Warn().Log("Stop forced leadership due to contact to leader")
 				c.raftEmergencyNotifyCh <- false
 				isEmergencyLeader = false

cluster/leader.go

@@ -241,7 +241,7 @@ RECONCILE:
 
 	// Check if we need to handle initial leadership actions
 	if !establishedLeader {
-		if err := c.establishLeadership(context.TODO()); err != nil {
+		if err := c.establishLeadership(context.TODO(), emergency); err != nil {
 			c.logger.Error().WithError(err).Log("Establish leadership")
 			// Immediately revoke leadership since we didn't successfully
 			// establish leadership.
@@ -286,15 +286,13 @@ WAIT:
 	}
 }
 
-func (c *cluster) establishLeadership(ctx context.Context) error {
-	c.logger.Debug().Log("Establishing leadership")
-
-	// creating a map of which process runs where
+func (c *cluster) establishLeadership(ctx context.Context, emergency bool) error {
+	c.logger.Debug().WithField("emergency", emergency).Log("Establishing leadership")
 
 	ctx, cancel := context.WithCancel(ctx)
 	c.cancelLeaderShip = cancel
 
-	go c.startRebalance(ctx, c.syncInterval)
+	go c.startSynchronizeAndRebalance(ctx, c.syncInterval, emergency)
 
 	return nil
 }
@@ -305,7 +303,26 @@ func (c *cluster) revokeLeadership() {
 	c.cancelLeaderShip()
 }
 
-func (c *cluster) startRebalance(ctx context.Context, interval time.Duration) {
+// startSynchronizeAndRebalance synchronizes and rebalances the processes in a given interval. Synchronizing
+// takes care that all processes in the cluster DB are running on one node. It writes the process->node mapping
+// to the cluster DB such that when a new leader gets elected it knows where which process should be running.
+// This is checked against the actual state. If a node is not reachable, the leader still knows which processes
+// should be running on that node. For a certain duration (nodeRecoverTimeout) this is tolerated in case the
+// node comes back. If not, the processes will be distributed to the remaining nodes. The actual observed state
+// is stored back into the cluster DB.
+//
+// It follows the rebalancing which takes care that processes are taken from overloaded nodes. In each iteration
+// only one process is taken away from a node. If a node is not reachable, its processes will be not part of the
+// rebalancing and no attempt will be made to move processes from and to that node.
+//
+// All this happens if there's a leader. If there's no leader election possible, the node goes into the
+// emergency leadership mode after a certain duration (emergencyLeaderTimeout). The synchronization phase will
+// happen based on the last known list of processes from the cluster DB. Until nodeRecoverTimeout is reached,
+// process that would run on unreachable nodes will not be moved to the node. Rebalancing will be disabled.
+//
+// The goal of synchronizing and rebalancing is to make as little moves as possible and to be tolerant for
+// a while if a node is not reachable.
+func (c *cluster) startSynchronizeAndRebalance(ctx context.Context, interval time.Duration, emergency bool) {
 	ticker := time.NewTicker(interval)
 	defer ticker.Stop()
 
@@ -314,8 +331,11 @@ func (c *cluster) startRebalance(ctx context.Context, interval time.Duration) {
 		case <-ctx.Done():
 			return
 		case <-ticker.C:
-			c.doSynchronize()
-			c.doRebalance()
+			c.doSynchronize(emergency)
+
+			if !emergency {
+				c.doRebalance(emergency)
+			}
 		}
 	}
 }
@@ -377,6 +397,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Adding process")
 				break
 			}
+
 			err = c.proxy.ProcessStart(v.nodeid, v.config.ProcessID())
 			if err != nil {
 				c.logger.Info().WithError(err).WithFields(log.Fields{
@@ -398,6 +419,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Updating process")
 				break
 			}
+
 			c.logger.Info().WithFields(log.Fields{
 				"processid": v.config.ID,
 				"nodeid":    v.nodeid,
@@ -411,6 +433,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Removing process")
 				break
 			}
+
 			c.logger.Info().WithFields(log.Fields{
 				"processid": v.processid,
 				"nodeid":    v.nodeid,
@@ -425,6 +448,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Moving process, adding process")
 				break
 			}
+
 			err = c.proxy.ProcessDelete(v.fromNodeid, v.config.ProcessID())
 			if err != nil {
 				c.logger.Info().WithError(err).WithFields(log.Fields{
@@ -434,6 +458,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Moving process, removing process")
 				break
 			}
+
 			err = c.proxy.ProcessStart(v.toNodeid, v.config.ProcessID())
 			if err != nil {
 				c.logger.Info().WithError(err).WithFields(log.Fields{
@@ -443,6 +468,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Moving process, starting process")
 				break
 			}
+
 			c.logger.Info().WithFields(log.Fields{
 				"processid":  v.config.ID,
 				"fromnodeid": v.fromNodeid,
@@ -457,6 +483,7 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 				}).Log("Starting process")
 				break
 			}
+
 			c.logger.Info().WithFields(log.Fields{
 				"processid": v.processid,
 				"nodeid":    v.nodeid,
@@ -474,39 +501,73 @@ func (c *cluster) applyOpStack(stack []interface{}) {
 	}
 }
 
-func (c *cluster) doSynchronize() {
+func (c *cluster) doSynchronize(emergency bool) {
+	wish := c.store.GetProcessNodeMap()
 	want := c.store.ProcessList()
 	have := c.proxy.ListProcesses()
-	resources := c.proxy.Resources()
+	nodes := c.proxy.ListNodes()
+
+	nodesMap := map[string]proxy.NodeAbout{}
+
+	for _, node := range nodes {
+		about := node.About()
+		nodesMap[about.ID] = about
+	}
 
 	c.logger.Debug().WithFields(log.Fields{
 		"want":  want,
 		"have":  have,
-		"resources": resources,
+		"nodes": nodesMap,
 	}).Log("Synchronize")
 
-	opStack := synchronize(want, have, resources)
+	opStack, _, reality := synchronize(wish, want, have, nodesMap, c.nodeRecoverTimeout)
+
+	if !emergency {
+		cmd := &store.Command{
+			Operation: store.OpSetProcessNodeMap,
+			Data: store.CommandSetProcessNodeMap{
+				Map: reality,
+			},
+		}
+
+		c.applyCommand(cmd)
+	}
 
 	c.applyOpStack(opStack)
 }
 
-func (c *cluster) doRebalance() {
+func (c *cluster) doRebalance(emergency bool) {
 	have := c.proxy.ListProcesses()
-	resources := c.proxy.Resources()
+	nodes := c.proxy.ListNodes()
+
+	nodesMap := map[string]proxy.NodeAbout{}
+
+	for _, node := range nodes {
+		about := node.About()
+		nodesMap[about.ID] = about
+	}
 
 	c.logger.Debug().WithFields(log.Fields{
 		"have":  have,
-		"resources": resources,
+		"nodes": nodes,
 	}).Log("Rebalance")
 
-	opStack := rebalance(have, resources)
+	opStack, _ := rebalance(have, nodesMap)
 
 	c.applyOpStack(opStack)
 }
 
 // synchronize returns a list of operations in order to adjust the "have" list to the "want" list
 // with taking the available resources on each node into account.
-func synchronize(want []store.Process, have []proxy.Process, resources map[string]proxy.NodeResources) []interface{} {
+func synchronize(wish map[string]string, want []store.Process, have []proxy.Process, nodes map[string]proxy.NodeAbout, nodeRecoverTimeout time.Duration) ([]interface{}, map[string]proxy.NodeResources, map[string]string) {
+	resources := map[string]proxy.NodeResources{}
+	for nodeid, about := range nodes {
+		resources[nodeid] = about.Resources
+	}
+
+	// A map same as wish, but reflecting the actual situation.
+	reality := map[string]string{}
+
 	// A map from the process ID to the process config of the processes
 	// we want to be running on the nodes.
 	wantMap := map[string]store.Process{}
@@ -519,31 +580,32 @@ func synchronize(want []store.Process, have []proxy.Process, resources map[strin
 
 	// Now we iterate through the processes we actually have running on the nodes
 	// and remove them from the wantMap. We also make sure that they are running.
-	// If a process is not on the wantMap, it will be deleted from the nodes.
+	// If a process cannot be found on the wantMap, it will be deleted from the nodes.
 	haveAfterRemove := []proxy.Process{}
 
-	for _, p := range have {
-		pid := p.Config.ProcessID().String()
+	for _, haveP := range have {
+		pid := haveP.Config.ProcessID().String()
 		if wantP, ok := wantMap[pid]; !ok {
+			// The process is not on the wantMap. Delete it and adjust the resources.
 			opStack = append(opStack, processOpDelete{
-				nodeid:    p.NodeID,
-				processid: p.Config.ProcessID(),
+				nodeid:    haveP.NodeID,
+				processid: haveP.Config.ProcessID(),
 			})
 
-			// Adjust the resources
-			r, ok := resources[p.NodeID]
+			r, ok := resources[haveP.NodeID]
 			if ok {
-				r.CPU -= p.CPU
-				r.Mem -= p.Mem
-				resources[p.NodeID] = r
+				r.CPU -= haveP.CPU
+				r.Mem -= haveP.Mem
+				resources[haveP.NodeID] = r
 			}
 
 			continue
 		} else {
-			if wantP.UpdatedAt.After(p.UpdatedAt) {
+			// The process is on the wantMap. Update the process if the configuration differ.
+			if !wantP.Config.Equal(haveP.Config) {
 				opStack = append(opStack, processOpUpdate{
-					nodeid:    p.NodeID,
-					processid: p.Config.ProcessID(),
+					nodeid:    haveP.NodeID,
+					processid: haveP.Config.ProcessID(),
 					config:    wantP.Config,
 					metadata:  wantP.Metadata,
 				})
@@ -551,24 +613,44 @@ func synchronize(want []store.Process, have []proxy.Process, resources map[strin
 		}
 
 		delete(wantMap, pid)
+		reality[pid] = haveP.NodeID
 
-		if p.Order != "start" {
+		if haveP.Order != "start" {
 			opStack = append(opStack, processOpStart{
-				nodeid:    p.NodeID,
-				processid: p.Config.ProcessID(),
+				nodeid:    haveP.NodeID,
+				processid: haveP.Config.ProcessID(),
 			})
 		}
 
-		haveAfterRemove = append(haveAfterRemove, p)
+		haveAfterRemove = append(haveAfterRemove, haveP)
 	}
 
 	have = haveAfterRemove
 
-	// A map from the process reference to the node it is running on
+	// In case a node didn't respond, some PID are still on the wantMap, that would run on
+	// the currently not responding nodes. We use the wish map to assign them to the node.
+	// If the node is unavailable for too long, keep these processes on the wantMap, otherwise
+	// remove them and hope that they will reappear during the nodeRecoverTimeout.
+	for pid := range wantMap {
+		// Check if this PID is be assigned to a node.
+		if nodeid, ok := wish[pid]; ok {
+			// Check for how long the node hasn't been contacted, or if it still exists.
+			if node, ok := nodes[nodeid]; ok {
+				if time.Since(node.LastContact) <= nodeRecoverTimeout {
+					reality[pid] = nodeid
+					delete(wantMap, pid)
+				}
+			}
+		}
+	}
+
+	// The wantMap now contains only those processes that need to be installed on a node.
+
+	// A map from the process reference to the node it is running on.
 	haveReferenceAffinityMap := createReferenceAffinityMap(have)
 
-	// Now all remaining processes in the wantMap must be added to one of the nodes
-	for _, process := range wantMap {
+	// Now all remaining processes in the wantMap must be added to one of the nodes.
+	for pid, process := range wantMap {
 		// If a process doesn't have any limits defined, reject that process
 		if process.Config.LimitCPU <= 0 || process.Config.LimitMemory <= 0 {
 			opStack = append(opStack, processOpReject{
@@ -580,19 +662,19 @@ func synchronize(want []store.Process, have []proxy.Process, resources map[strin
 		}
 
 		// Check if there are already processes with the same reference, and if so
-		// chose this node. Then check the node if it has enough resources left. If
+		// choose this node. Then check the node if it has enough resources left. If
 		// not, then select a node with the most available resources.
 		nodeid := ""
 
 		// Try to add the process to a node where other processes with the same
 		// reference currently reside.
 		if len(process.Config.Reference) != 0 {
-			for _, count := range haveReferenceAffinityMap[process.Config.Reference] {
+			for _, count := range haveReferenceAffinityMap[process.Config.Reference+"@"+process.Config.Domain] {
 				r := resources[count.nodeid]
 				cpu := process.Config.LimitCPU
 				mem := process.Config.LimitMemory
 
-				if r.CPU+cpu < r.CPULimit && r.Mem+mem < r.MemLimit {
+				if r.CPU+cpu < r.CPULimit && r.Mem+mem < r.MemLimit && !r.IsThrottling {
 					nodeid = count.nodeid
 					break
 				}
@@ -606,7 +688,7 @@ func synchronize(want []store.Process, have []proxy.Process, resources map[strin
 				mem := process.Config.LimitMemory
 
 				if len(nodeid) == 0 {
-					if r.CPU+cpu < r.CPULimit && r.Mem+mem < r.MemLimit {
+					if r.CPU+cpu < r.CPULimit && r.Mem+mem < r.MemLimit && !r.IsThrottling {
 						nodeid = id
 					}
 
@@ -633,6 +715,8 @@ func synchronize(want []store.Process, have []proxy.Process, resources map[strin
 				r.Mem += process.Config.LimitMemory
 				resources[nodeid] = r
 			}
+
+			reality[pid] = nodeid
 		} else {
 			opStack = append(opStack, processOpReject{
 				processid: process.Config.ProcessID(),
@@ -641,7 +725,7 @@ func synchronize(want []store.Process, have []proxy.Process, resources map[strin
 		}
 	}
 
-	return opStack
+	return opStack, resources, reality
 }
 
 type referenceAffinityNodeCount struct {
@@ -649,6 +733,8 @@ type referenceAffinityNodeCount struct {
 	count  uint64
 }
 
+// createReferenceAffinityMap returns a map of references (per domain) to an array of nodes this reference
+// is found on and their count. The array is sorted by the count, the highest first.
 func createReferenceAffinityMap(processes []proxy.Process) map[string][]referenceAffinityNodeCount {
 	referenceAffinityMap := map[string][]referenceAffinityNodeCount{}
 	for _, p := range processes {
@@ -656,11 +742,13 @@ func createReferenceAffinityMap(processes []proxy.Process) map[string][]referenc
 			continue
 		}
 
+		ref := p.Config.Reference + "@" + p.Config.Domain
+
 		// Here we count how often a reference is present on a node. When
 		// moving processes to a different node, the node with the highest
 		// count of same references will be the first candidate.
 		found := false
-		arr := referenceAffinityMap[p.Config.Reference]
+		arr := referenceAffinityMap[ref]
 		for i, count := range arr {
 			if count.nodeid == p.NodeID {
 				count.count++
@@ -677,7 +765,7 @@ func createReferenceAffinityMap(processes []proxy.Process) map[string][]referenc
 			})
 		}
 
-		referenceAffinityMap[p.Config.Reference] = arr
+		referenceAffinityMap[ref] = arr
 	}
 
 	// Sort every reference count in decreasing order for each reference
@@ -692,32 +780,15 @@ func createReferenceAffinityMap(processes []proxy.Process) map[string][]referenc
 	return referenceAffinityMap
 }
 
-// rebalance returns a list of operations that will move running processes away from nodes
-// that are overloaded.
-func rebalance(have []proxy.Process, resources map[string]proxy.NodeResources) []interface{} {
-	// Group the processes by node
-	processNodeMap := map[string][]proxy.Process{}
-
-	for _, p := range have {
-		processNodeMap[p.NodeID] = append(processNodeMap[p.NodeID], p)
+// rebalance returns a list of operations that will move running processes away from nodes that are overloaded.
+func rebalance(have []proxy.Process, nodes map[string]proxy.NodeAbout) ([]interface{}, map[string]proxy.NodeResources) {
+	resources := map[string]proxy.NodeResources{}
+	for nodeid, about := range nodes {
+		resources[nodeid] = about.Resources
 	}
 
-	// Sort the processes by their runtime (if they are running) for each node
-	for nodeid, processes := range processNodeMap {
-		sort.SliceStable(processes, func(a, b int) bool {
-			if processes[a].State == "running" {
-				if processes[b].State != "running" {
-					return false
-				}
-
-				return processes[a].Runtime < processes[b].Runtime
-			}
-
-			return false
-		})
-
-		processNodeMap[nodeid] = processes
-	}
+	// Group the processes by node and sort them
+	nodeProcessMap := createNodeProcessMap(have)
 
 	// A map from the process reference to the nodes it is running on
 	haveReferenceAffinityMap := createReferenceAffinityMap(have)
@@ -725,15 +796,17 @@ func rebalance(have []proxy.Process, resources map[string]proxy.NodeResources) [
 	opStack := []interface{}{}
 
 	// Check if any of the nodes is overloaded
-	for id, r := range resources {
+	for id, node := range nodes {
+		r := node.Resources
+
 		// Check if node is overloaded
-		if r.CPU < r.CPULimit && r.Mem < r.MemLimit {
+		if r.CPU < r.CPULimit && r.Mem < r.MemLimit && !r.IsThrottling {
 			continue
 		}
 
 		// Move processes from this noed to another node with enough free resources.
 		// The processes are ordered ascending by their runtime.
-		processes := processNodeMap[id]
+		processes := nodeProcessMap[id]
 		if len(processes) == 0 {
 			// If there are no processes on that node, we can't do anything
 			continue
@@ -752,13 +825,13 @@ func rebalance(have []proxy.Process, resources map[string]proxy.NodeResources) [
 			// Try to move the process to a node where other processes with the same
 			// reference currently reside.
 			if len(p.Config.Reference) != 0 {
-				for _, count := range haveReferenceAffinityMap[p.Config.Reference] {
+				for _, count := range haveReferenceAffinityMap[p.Config.Reference+"@"+p.Config.Domain] {
 					if count.nodeid == overloadedNodeid {
 						continue
 					}
 
 					r := resources[count.nodeid]
-					if r.CPU+p.CPU < r.CPULimit && r.Mem+p.Mem < r.MemLimit {
+					if r.CPU+p.CPU < r.CPULimit && r.Mem+p.Mem < r.MemLimit && !r.IsThrottling {
 						availableNodeid = count.nodeid
 						break
 					}
@@ -767,13 +840,15 @@ func rebalance(have []proxy.Process, resources map[string]proxy.NodeResources) [
 
 			// Find another node with enough resources available
 			if len(availableNodeid) == 0 {
-				for id, r := range resources {
+				for id, node := range nodes {
 					if id == overloadedNodeid {
 						// Skip the overloaded node
 						continue
 					}
 
-					if r.CPU+p.CPU < r.CPULimit && r.Mem+p.Mem < r.MemLimit {
+					r := node.Resources
+
+					if r.CPU+p.CPU < r.CPULimit && r.Mem+p.Mem < r.MemLimit && !r.IsThrottling {
 						availableNodeid = id
 						break
 					}
@@ -812,12 +887,40 @@ func rebalance(have []proxy.Process, resources map[string]proxy.NodeResources) [
 			r.Mem -= p.Mem
 			resources[overloadedNodeid] = r
 
-			// If this node is not anymore overloaded, stop moving processes around
-			if r.CPU < r.CPULimit && r.Mem < r.MemLimit {
+			// Move only one process at a time
 			break
 		}
 	}
+
+	return opStack, resources
+}
+
+// createNodeProcessMap takes a list of processes and groups them by the nodeid they
+// are running on. Each group gets sorted by their preference to be moved somewhere
+// else, decreasing.
+func createNodeProcessMap(processes []proxy.Process) map[string][]proxy.Process {
+	nodeProcessMap := map[string][]proxy.Process{}
+
+	for _, p := range processes {
+		nodeProcessMap[p.NodeID] = append(nodeProcessMap[p.NodeID], p)
 	}
 
-	return opStack
+	// Sort the processes by their runtime (if they are running) for each node
+	for nodeid, processes := range nodeProcessMap {
+		sort.SliceStable(processes, func(a, b int) bool {
+			if processes[a].State == "running" {
+				if processes[b].State != "running" {
+					return false
+				}
+
+				return processes[a].Runtime < processes[b].Runtime
+			}
+
+			return false
+		})
+
+		nodeProcessMap[nodeid] = processes
+	}
+
+	return nodeProcessMap
 }

cluster/leader_test.go

@@ -12,6 +12,8 @@ import (
 )
 
 func TestSynchronizeAdd(t *testing.T) {
+	wish := map[string]string{}
+
 	want := []store.Process{
 		{
 			UpdatedAt: time.Now(),
@@ -25,24 +27,30 @@ func TestSynchronizeAdd(t *testing.T) {
 
 	have := []proxy.Process{}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      7,
 				Mem:      35,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      85,
 				Mem:      11,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, resources, reality := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpAdd{
@@ -55,6 +63,10 @@ func TestSynchronizeAdd(t *testing.T) {
 		},
 	}, stack)
 
+	require.Equal(t, map[string]string{
+		"foobar@": "node1",
+	}, reality)
+
 	require.Equal(t, map[string]proxy.NodeResources{
 		"node1": {
 			NCPU:     1,
@@ -74,6 +86,10 @@ func TestSynchronizeAdd(t *testing.T) {
 }
 
 func TestSynchronizeAddReferenceAffinity(t *testing.T) {
+	wish := map[string]string{
+		"foobar@": "node2",
+	}
+
 	now := time.Now()
 
 	want := []store.Process{
@@ -109,28 +125,36 @@ func TestSynchronizeAddReferenceAffinity(t *testing.T) {
 			Config: &app.Config{
 				ID:          "foobar",
 				Reference:   "barfoo",
+				LimitCPU:    10,
+				LimitMemory: 20,
 			},
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      1,
 				Mem:      1,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      1,
 				Mem:      1,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, _, reality := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpAdd{
@@ -143,9 +167,16 @@ func TestSynchronizeAddReferenceAffinity(t *testing.T) {
 			},
 		},
 	}, stack)
+
+	require.Equal(t, map[string]string{
+		"foobar@":  "node2",
+		"foobar2@": "node2",
+	}, reality)
 }
 
 func TestSynchronizeAddLimit(t *testing.T) {
+	wish := map[string]string{}
+
 	want := []store.Process{
 		{
 			UpdatedAt: time.Now(),
@@ -159,24 +190,30 @@ func TestSynchronizeAddLimit(t *testing.T) {
 
 	have := []proxy.Process{}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      81,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      79,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, resources, reality := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpAdd{
@@ -189,6 +226,10 @@ func TestSynchronizeAddLimit(t *testing.T) {
 		},
 	}, stack)
 
+	require.Equal(t, map[string]string{
+		"foobar@": "node2",
+	}, reality)
+
 	require.Equal(t, map[string]proxy.NodeResources{
 		"node1": {
 			NCPU:     1,
@@ -208,6 +249,8 @@ func TestSynchronizeAddLimit(t *testing.T) {
 }
 
 func TestSynchronizeAddNoResourcesCPU(t *testing.T) {
+	wish := map[string]string{}
+
 	want := []store.Process{
 		{
 			UpdatedAt: time.Now(),
@@ -221,24 +264,30 @@ func TestSynchronizeAddNoResourcesCPU(t *testing.T) {
 
 	have := []proxy.Process{}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      81,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      79,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, _, _ := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpReject{
@@ -249,6 +298,8 @@ func TestSynchronizeAddNoResourcesCPU(t *testing.T) {
 }
 
 func TestSynchronizeAddNoResourcesMemory(t *testing.T) {
+	wish := map[string]string{}
+
 	want := []store.Process{
 		{
 			UpdatedAt: time.Now(),
@@ -262,24 +313,30 @@ func TestSynchronizeAddNoResourcesMemory(t *testing.T) {
 
 	have := []proxy.Process{}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      81,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      79,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, _, _ := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpReject{
@@ -290,6 +347,8 @@ func TestSynchronizeAddNoResourcesMemory(t *testing.T) {
 }
 
 func TestSynchronizeAddNoLimits(t *testing.T) {
+	wish := map[string]string{}
+
 	want := []store.Process{
 		{
 			UpdatedAt: time.Now(),
@@ -301,24 +360,30 @@ func TestSynchronizeAddNoLimits(t *testing.T) {
 
 	have := []proxy.Process{}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      81,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      79,
 				Mem:      72,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, _, _ := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpReject{
@@ -329,6 +394,10 @@ func TestSynchronizeAddNoLimits(t *testing.T) {
 }
 
 func TestSynchronizeRemove(t *testing.T) {
+	wish := map[string]string{
+		"foobar@": "node2",
+	}
+
 	want := []store.Process{}
 
 	have := []proxy.Process{
@@ -345,24 +414,30 @@ func TestSynchronizeRemove(t *testing.T) {
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      7,
 				Mem:      65,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      85,
 				Mem:      11,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, resources, reality := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpDelete{
@@ -387,9 +462,15 @@ func TestSynchronizeRemove(t *testing.T) {
 			MemLimit: 90,
 		},
 	}, resources)
+
+	require.Equal(t, map[string]string{}, reality)
 }
 
 func TestSynchronizeAddRemove(t *testing.T) {
+	wish := map[string]string{
+		"foobar2@": "node2",
+	}
+
 	want := []store.Process{
 		{
 			UpdatedAt: time.Now(),
@@ -415,24 +496,30 @@ func TestSynchronizeAddRemove(t *testing.T) {
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      7,
 				Mem:      35,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      85,
 				Mem:      65,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	stack := synchronize(want, have, resources)
+	stack, resources, reality := synchronize(wish, want, have, nodes, 2*time.Minute)
 
 	require.Equal(t, []interface{}{
 		processOpDelete{
@@ -465,6 +552,10 @@ func TestSynchronizeAddRemove(t *testing.T) {
 			MemLimit: 90,
 		},
 	}, resources)
+
+	require.Equal(t, map[string]string{
+		"foobar1@": "node1",
+	}, reality)
 }
 
 func TestRebalanceNothingToDo(t *testing.T) {
@@ -493,24 +584,30 @@ func TestRebalanceNothingToDo(t *testing.T) {
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      42,
 				Mem:      35,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      37,
 				Mem:      11,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	opStack := rebalance(processes, resources)
+	opStack, _ := rebalance(processes, nodes)
 
 	require.Empty(t, opStack)
 }
@@ -552,24 +649,30 @@ func TestRebalanceOverload(t *testing.T) {
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      91,
 				Mem:      35,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      15,
 				Mem:      11,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	opStack := rebalance(processes, resources)
+	opStack, resources := rebalance(processes, nodes)
 
 	require.NotEmpty(t, opStack)
 
@@ -638,24 +741,30 @@ func TestRebalanceSkip(t *testing.T) {
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      91,
 				Mem:      35,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      15,
 				Mem:      92,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	opStack := rebalance(processes, resources)
+	opStack, resources := rebalance(processes, nodes)
 
 	require.NotEmpty(t, opStack)
 
@@ -758,31 +867,40 @@ func TestRebalanceReferenceAffinity(t *testing.T) {
 		},
 	}
 
-	resources := map[string]proxy.NodeResources{
+	nodes := map[string]proxy.NodeAbout{
 		"node1": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      90,
 				Mem:      90,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node2": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      1,
 				Mem:      1,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 		"node3": {
+			LastContact: time.Now(),
+			Resources: proxy.NodeResources{
 				NCPU:     1,
 				CPU:      1,
 				Mem:      1,
 				CPULimit: 90,
 				MemLimit: 90,
 			},
+		},
 	}
 
-	opStack := rebalance(processes, resources)
+	opStack, resources := rebalance(processes, nodes)
 
 	require.NotEmpty(t, opStack)
 
@@ -822,6 +940,164 @@ func TestRebalanceReferenceAffinity(t *testing.T) {
 	}, resources)
 }
 
+func TestCreateNodeProcessMap(t *testing.T) {
+	processes := []proxy.Process{
+		{
+			NodeID:  "node1",
+			Order:   "start",
+			State:   "running",
+			CPU:     1,
+			Mem:     1,
+			Runtime: 42,
+			Config: &app.Config{
+				ID: "foobar1",
+			},
+		},
+		{
+			NodeID:  "node1",
+			Order:   "start",
+			State:   "running",
+			CPU:     1,
+			Mem:     1,
+			Runtime: 1,
+			Config: &app.Config{
+				ID:        "foobar2",
+				Reference: "ref1",
+			},
+		},
+		{
+			NodeID:  "node2",
+			Order:   "start",
+			State:   "running",
+			CPU:     1,
+			Mem:     1,
+			Runtime: 67,
+			Config: &app.Config{
+				ID:        "foobar3",
+				Reference: "ref3",
+			},
+		},
+		{
+			NodeID:  "node2",
+			Order:   "start",
+			State:   "running",
+			CPU:     1,
+			Mem:     1,
+			Runtime: 42,
+			Config: &app.Config{
+				ID:        "foobar3",
+				Reference: "ref2",
+			},
+		},
+		{
+			NodeID:  "node3",
+			Order:   "start",
+			State:   "running",
+			CPU:     1,
+			Mem:     1,
+			Runtime: 41,
+			Config: &app.Config{
+				ID:        "foobar4",
+				Reference: "ref1",
+			},
+		},
+		{
+			NodeID:  "node3",
+			Order:   "start",
+			State:   "running",
+			CPU:     1,
+			Mem:     1,
+			Runtime: 42,
+			Config: &app.Config{
+				ID:        "foobar5",
+				Reference: "ref1",
+			},
+		},
+	}
+
+	nodeProcessMap := createNodeProcessMap(processes)
+
+	require.Equal(t, map[string][]proxy.Process{
+		"node1": {
+			{
+				NodeID:  "node1",
+				Order:   "start",
+				State:   "running",
+				CPU:     1,
+				Mem:     1,
+				Runtime: 1,
+				Config: &app.Config{
+					ID:        "foobar2",
+					Reference: "ref1",
+				},
+			},
+			{
+				NodeID:  "node1",
+				Order:   "start",
+				State:   "running",
+				CPU:     1,
+				Mem:     1,
+				Runtime: 42,
+				Config: &app.Config{
+					ID: "foobar1",
+				},
+			},
+		},
+		"node2": {
+			{
+				NodeID:  "node2",
+				Order:   "start",
+				State:   "running",
+				CPU:     1,
+				Mem:     1,
+				Runtime: 42,
+				Config: &app.Config{
+					ID:        "foobar3",
+					Reference: "ref2",
+				},
+			},
+			{
+				NodeID:  "node2",
+				Order:   "start",
+				State:   "running",
+				CPU:     1,
+				Mem:     1,
+				Runtime: 67,
+				Config: &app.Config{
+					ID:        "foobar3",
+					Reference: "ref3",
+				},
+			},
+		},
+		"node3": {
+			{
+				NodeID:  "node3",
+				Order:   "start",
+				State:   "running",
+				CPU:     1,
+				Mem:     1,
+				Runtime: 41,
+				Config: &app.Config{
+					ID:        "foobar4",
+					Reference: "ref1",
+				},
+			},
+			{
+				NodeID:  "node3",
+				Order:   "start",
+				State:   "running",
+				CPU:     1,
+				Mem:     1,
+				Runtime: 42,
+				Config: &app.Config{
+					ID:        "foobar5",
+					Reference: "ref1",
+				},
+			},
+		},
+	}, nodeProcessMap)
+}
+
 func TestCreateReferenceAffinityNodeMap(t *testing.T) {
 	processes := []proxy.Process{
 		{
@@ -900,7 +1176,7 @@ func TestCreateReferenceAffinityNodeMap(t *testing.T) {
 	affinityMap := createReferenceAffinityMap(processes)
 
 	require.Equal(t, map[string][]referenceAffinityNodeCount{
-		"ref1": {
+		"ref1@": {
 			{
 				nodeid: "node3",
 				count:  2,
@@ -910,13 +1186,13 @@ func TestCreateReferenceAffinityNodeMap(t *testing.T) {
 				count:  1,
 			},
 		},
-		"ref2": {
+		"ref2@": {
 			{
 				nodeid: "node2",
 				count:  1,
 			},
 		},
-		"ref3": {
+		"ref3@": {
 			{
 				nodeid: "node2",
 				count:  1,

cluster/proxy/node.go

@@ -41,6 +41,7 @@ type NodeReader interface {
 	IPs() []string
 	About() NodeAbout
 	Version() NodeVersion
+	Resources() NodeResources
 
 	Files() NodeFiles
 	ProcessList() ([]Process, error)
@@ -495,6 +496,22 @@ func (n *node) About() NodeAbout {
 	return nodeAbout
 }
 
+func (n *node) Resources() NodeResources {
+	n.stateLock.RLock()
+	defer n.stateLock.RUnlock()
+
+	r := NodeResources{
+		IsThrottling: n.resources.throttling,
+		NCPU:         n.resources.ncpu,
+		CPU:          n.resources.cpu,
+		CPULimit:     n.resources.cpuLimit,
+		Mem:          n.resources.mem,
+		MemLimit:     n.resources.memLimit,
+	}
+
+	return r
+}
+
 func (n *node) Version() NodeVersion {
 	about, err := n.AboutPeer()
 	if err != nil {

cluster/proxy/proxy.go

@@ -239,9 +239,8 @@ func (p *proxy) Resources() map[string]NodeResources {
 	p.lock.RLock()
 	defer p.lock.RUnlock()
 
-	for _, node := range p.nodes {
-		about := node.About()
-		resources[about.ID] = about.Resources
+	for id, node := range p.nodes {
+		resources[id] = node.Resources()
 	}
 
 	return resources

cluster/store/store.go

@@ -1,7 +1,6 @@
 package store
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -23,6 +22,7 @@ type Store interface {
 
 	ProcessList() []Process
 	GetProcess(id app.ProcessID) (Process, error)
+	GetProcessNodeMap() map[string]string
 
 	UserList() Users
 	GetUser(name string) Users
@@ -68,6 +68,7 @@ const (
 	OpUpdateIdentity     Operation = "updateIdentity"
 	OpRemoveIdentity     Operation = "removeIdentity"
 	OpSetPolicies        Operation = "setPolicies"
+	OpSetProcessNodeMap  Operation = "setProcessNodeMap"
 )
 
 type Command struct {
@@ -112,10 +113,19 @@ type CommandSetPolicies struct {
 	Policies []access.Policy
 }
 
+type CommandSetProcessNodeMap struct {
+	Map map[string]string
+}
+
 // Implement a FSM
 type store struct {
 	lock     sync.RWMutex
+	callback func(op Operation)
+
+	logger log.Logger
+
 	Process        map[string]Process
+	ProcessNodeMap map[string]string
 
 	Users struct {
 		UpdatedAt time.Time
@@ -126,10 +136,6 @@ type store struct {
 		UpdatedAt time.Time
 		Policies  map[string][]access.Policy
 	}
-
-	callback func(op Operation)
-
-	logger log.Logger
 }
 
 type Config struct {
@@ -139,6 +145,7 @@ type Config struct {
 func NewStore(config Config) (Store, error) {
 	s := &store{
 		Process:        map[string]Process{},
+		ProcessNodeMap: map[string]string{},
 		logger:         config.Logger,
 	}
 
@@ -219,6 +226,12 @@ func (s *store) Apply(entry *raft.Log) interface{} {
 		json.Unmarshal(b, &cmd)
 
 		err = s.setPolicies(cmd)
+	case OpSetProcessNodeMap:
+		b, _ := json.Marshal(c.Data)
+		cmd := CommandSetProcessNodeMap{}
+		json.Unmarshal(b, &cmd)
+
+		err = s.setProcessNodeMap(cmd)
 	default:
 		s.logger.Warn().WithField("operation", c.Operation).Log("Unknown operation")
 		return nil
@@ -244,6 +257,10 @@ func (s *store) addProcess(cmd CommandAddProcess) error {
 
 	id := cmd.Config.ProcessID().String()
 
+	if cmd.Config.LimitCPU <= 0 || cmd.Config.LimitMemory <= 0 {
+		return NewStoreError("the process with the ID '%s' must have limits defined", id)
+	}
+
 	_, ok := s.Process[id]
 	if ok {
 		return NewStoreError("the process with the ID '%s' already exists", id)
@@ -283,15 +300,16 @@ func (s *store) updateProcess(cmd CommandUpdateProcess) error {
 	srcid := cmd.ID.String()
 	dstid := cmd.Config.ProcessID().String()
 
+	if cmd.Config.LimitCPU <= 0 || cmd.Config.LimitMemory <= 0 {
+		return NewStoreError("the process with the ID '%s' must have limits defined", dstid)
+	}
+
 	p, ok := s.Process[srcid]
 	if !ok {
 		return NewStoreError("the process with the ID '%s' doesn't exists", srcid)
 	}
 
-	currentHash := p.Config.Hash()
-	replaceHash := cmd.Config.Hash()
-
-	if bytes.Equal(currentHash, replaceHash) {
+	if p.Config.Equal(cmd.Config) {
 		return nil
 	}
 
@@ -404,6 +422,15 @@ func (s *store) setPolicies(cmd CommandSetPolicies) error {
 	return nil
 }
 
+func (s *store) setProcessNodeMap(cmd CommandSetProcessNodeMap) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.ProcessNodeMap = cmd.Map
+
+	return nil
+}
+
 func (s *store) OnApply(fn func(op Operation)) {
 	s.lock.Lock()
 	defer s.lock.Unlock()
@@ -545,6 +572,19 @@ func (s *store) PolicyUserList(name string) Policies {
 	return p
 }
 
+func (s *store) GetProcessNodeMap() map[string]string {
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+
+	m := map[string]string{}
+
+	for key, value := range s.ProcessNodeMap {
+		m[key] = value
+	}
+
+	return m
+}
+
 type fsmSnapshot struct {
 	data []byte
 }

config/config.go

@@ -291,6 +291,7 @@ func (d *Config) init() {
 	d.vars.Register(value.NewClusterPeerList(&d.Cluster.Peers, []string{""}, ","), "cluster.peers", "CORE_CLUSTER_PEERS", nil, "Raft addresses of cores that are part of the cluster", false, false)
 	d.vars.Register(value.NewInt64(&d.Cluster.SyncInterval, 5), "cluster.sync_interval", "CORE_CLUSTER_SYNC_INTERVAL", nil, "Interval between aligning the process in the cluster DB with the processes on the nodes", true, false)
 	d.vars.Register(value.NewInt64(&d.Cluster.NodeRecoverTimeout, 120), "cluster.node_recover_timeout", "CORE_CLUSTER_NODE_RECOVER_TIMEOUT", nil, "Timeout for a node to recover before rebalancing the processes", true, false)
+	d.vars.Register(value.NewInt64(&d.Cluster.EmergencyLeaderTimeout, 10), "cluster.emergency_leader_timeout", "CORE_CLUSTER_EMERGENCY_LEADER_TIMEOUT", nil, "Timeout for establishing the emergency leadership after lost contact to raft leader", true, false)
 }
 
 // Validate validates the current state of the Config for completeness and sanity. Errors are

config/data.go

@@ -181,6 +181,7 @@ type Data struct {
 		Peers                  []string `json:"peers"`
 		SyncInterval           int64    `json:"sync_interval" format:"int64"`            // seconds
 		NodeRecoverTimeout     int64    `json:"node_recover_timeout" format:"int64"`     // seconds
+		EmergencyLeaderTimeout int64    `json:"emergency_leader_timeout" format:"int64"` // seconds
 	} `json:"cluster"`
 }
 

log/format.go

@@ -96,17 +96,27 @@ func (f *consoleFormatter) String(e *Event) string {
 		value := e.Data[key]
 
 		switch val := value.(type) {
+		case bool:
+			if val {
+				v = "true"
+			} else {
+				v = "false"
+			}
 		case string:
 			v = f.quote(val)
 		case error:
 			v = f.quote(val.Error())
 		default:
+			if str, ok := val.(fmt.Stringer); ok {
+				v = f.quote(str.String())
+			} else {
 				if jsonvalue, err := json.Marshal(value); err == nil {
 					v = string(jsonvalue)
 				} else {
 					v = f.quote(err.Error())
 				}
 			}
+		}
 
 		message += fmt.Sprintf(" %s", f.writeKV(key, v))
 	}

restream/app/process.go

@@ -176,6 +176,10 @@ func (config *Config) Hash() []byte {
 	return sum[:]
 }
 
+func (c *Config) Equal(a *Config) bool {
+	return bytes.Equal(c.Hash(), a.Hash())
+}
+
 func (c *Config) ProcessID() ProcessID {
 	return ProcessID{
 		ID:     c.ID,
@@ -293,7 +297,7 @@ func (p ProcessID) String() string {
 	return p.ID + "@" + p.Domain
 }
 
-func (p ProcessID) Equals(b ProcessID) bool {
+func (p ProcessID) Equal(b ProcessID) bool {
 	if p.ID == b.ID && p.Domain == b.Domain {
 		return true
 	}

restream/restream.go

@@ -1,7 +1,6 @@
 package restream
 
 import (
-	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -1177,17 +1176,14 @@ func (r *restream) UpdateProcess(id app.ProcessID, config *app.Config) error {
 		return err
 	}
 
-	currentHash := task.config.Hash()
-	replaceHash := t.config.Hash()
-
 	// If the new config has the same hash as the current config, do nothing.
-	if bytes.Equal(currentHash, replaceHash) {
+	if task.config.Equal(t.config) {
 		return nil
 	}
 
 	tid := t.ID()
 
-	if !tid.Equals(id) {
+	if !tid.Equal(id) {
 		_, ok := r.tasks[tid]
 		if ok {
 			return ErrProcessExists