コード例 #1
0
ファイル: clock_offset.go プロジェクト: yaojingguo/cockroach
// newRemoteClockMonitor returns a monitor with the given server clock.
func newRemoteClockMonitor(clock *hlc.Clock, offsetTTL time.Duration) *RemoteClockMonitor {
	r := RemoteClockMonitor{
		clock:     clock,
		offsetTTL: offsetTTL,
	}
	r.mu.offsets = make(map[string]RemoteOffset)
	r.metrics = RemoteClockMetrics{
		ClusterOffsetLowerBound: metric.NewGauge(metaClusterOffsetLowerBound),
		ClusterOffsetUpperBound: metric.NewGauge(metaClusterOffsetUpperBound),
	}
	return &r
}
コード例 #2
0
ファイル: node_set.go プロジェクト: yangxuanjia/cockroach
// filter returns an nodeSet of nodes which return true when passed to the
// supplied filter function filterFn. filterFn should return true to keep an
// node and false to remove an node. The new nodeSet has a separate gauge object
// from the parent.
func (as nodeSet) filter(filterFn func(node roachpb.NodeID) bool) nodeSet {
	avail := makeNodeSet(as.maxSize, metric.NewGauge())
	for node := range as.nodes {
		if filterFn(node) {
			avail.addNode(node)
		}
	}
	return avail
}
コード例 #3
0
func TestNodeSetFilter(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes1 := makeNodeSet(2, metric.NewGauge())
	node0 := roachpb.NodeID(1)
	node1 := roachpb.NodeID(2)
	nodes1.addNode(node0)
	nodes1.addNode(node1)

	nodes2 := makeNodeSet(1, metric.NewGauge())
	nodes2.addNode(node1)

	filtered := nodes1.filter(func(a roachpb.NodeID) bool {
		return !nodes2.hasNode(a)
	})
	if filtered.len() != 1 || filtered.hasNode(node1) || !filtered.hasNode(node0) {
		t.Errorf("expected filter to leave node0: %+v", filtered)
	}
}
コード例 #4
0
ファイル: node_set.go プロジェクト: yaojingguo/cockroach
// filter returns an nodeSet of nodes which return true when passed to the
// supplied filter function filterFn. filterFn should return true to keep an
// node and false to remove an node. The new nodeSet has a separate gauge object
// from the parent.
func (as nodeSet) filter(filterFn func(node roachpb.NodeID) bool) nodeSet {
	avail := makeNodeSet(as.maxSize,
		metric.NewGauge(metric.Metadata{Name: "TODO(marc)", Help: "TODO(marc)"}))
	for node := range as.nodes {
		if filterFn(node) {
			avail.addNode(node)
		}
	}
	return avail
}
コード例 #5
0
// TestLeastUseful verifies that the least-contributing peer node
// can be determined.
func TestLeastUseful(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := []roachpb.NodeID{
		roachpb.NodeID(1),
		roachpb.NodeID(2),
	}
	stopper := stop.NewStopper()
	defer stopper.Stop()
	is := newInfoStore(context.TODO(), 1, emptyAddr, stopper)

	set := makeNodeSet(3, metric.NewGauge(metric.Metadata{Name: ""}))
	if is.leastUseful(set) != 0 {
		t.Error("not expecting a node from an empty set")
	}

	inf1 := is.newInfo(nil, time.Second)
	inf1.NodeID = 1
	inf1.PeerID = 1
	if err := is.addInfo("a1", inf1); err != nil {
		t.Fatal(err)
	}
	if is.leastUseful(set) != 0 {
		t.Error("not expecting a node from an empty set")
	}

	set.addNode(nodes[0])
	if is.leastUseful(set) != nodes[0] {
		t.Error("expecting nodes[0] as least useful")
	}

	inf2 := is.newInfo(nil, time.Second)
	inf2.NodeID = 2
	inf2.PeerID = 1
	if err := is.addInfo("a2", inf2); err != nil {
		t.Fatal(err)
	}
	if is.leastUseful(set) != nodes[0] {
		t.Error("expecting nodes[0] as least useful")
	}

	set.addNode(nodes[1])
	if is.leastUseful(set) != nodes[1] {
		t.Error("expecting nodes[1] as least useful")
	}

	inf3 := is.newInfo(nil, time.Second)
	inf3.NodeID = 2
	inf3.PeerID = 2
	if err := is.addInfo("a3", inf3); err != nil {
		t.Fatal(err)
	}
	if is.leastUseful(set) != nodes[1] {
		t.Error("expecting nodes[1] as least useful")
	}
}
コード例 #6
0
func TestNodeSetMaxSize(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(1, metric.NewGauge())
	if !nodes.hasSpace() {
		t.Error("set should have space")
	}
	nodes.addNode(roachpb.NodeID(1))
	if nodes.hasSpace() {
		t.Error("set should have no space")
	}
}
コード例 #7
0
func TestNodeSetHasNode(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(2, metric.NewGauge())
	node := roachpb.NodeID(1)
	if nodes.hasNode(node) {
		t.Error("node wasn't added and should not be valid")
	}
	// Add node and verify it's valid.
	nodes.addNode(node)
	if !nodes.hasNode(node) {
		t.Error("empty node wasn't added and should not be valid")
	}
}
コード例 #8
0
func TestNodeSetAsSlice(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(2, metric.NewGauge())
	node0 := roachpb.NodeID(1)
	node1 := roachpb.NodeID(2)
	nodes.addNode(node0)
	nodes.addNode(node1)

	nodeArr := nodes.asSlice()
	if len(nodeArr) != 2 {
		t.Error("expected slice of length 2:", nodeArr)
	}
	if (nodeArr[0] != node0 && nodeArr[0] != node1) ||
		(nodeArr[1] != node1 && nodeArr[1] != node0) {
		t.Error("expected slice to contain both node0 and node1:", nodeArr)
	}
}
コード例 #9
0
ファイル: gossip.go プロジェクト: yaojingguo/cockroach
// New creates an instance of a gossip node.
func New(
	ctx context.Context,
	rpcContext *rpc.Context,
	grpcServer *grpc.Server,
	resolvers []resolver.Resolver,
	stopper *stop.Stopper,
	registry *metric.Registry,
) *Gossip {
	ctx = log.WithEventLog(ctx, "gossip", "gossip")
	g := &Gossip{
		ctx:               ctx,
		Connected:         make(chan struct{}),
		rpcContext:        rpcContext,
		server:            newServer(ctx, stopper, registry),
		outgoing:          makeNodeSet(minPeers, metric.NewGauge(MetaConnectionsOutgoingGauge)),
		bootstrapping:     map[string]struct{}{},
		disconnected:      make(chan *client, 10),
		stalledCh:         make(chan struct{}, 1),
		stallInterval:     defaultStallInterval,
		bootstrapInterval: defaultBootstrapInterval,
		cullInterval:      defaultCullInterval,
		nodeDescs:         map[roachpb.NodeID]*roachpb.NodeDescriptor{},
		resolverAddrs:     map[util.UnresolvedAddr]resolver.Resolver{},
		bootstrapAddrs:    map[util.UnresolvedAddr]struct{}{},
	}
	stopper.AddCloser(stop.CloserFn(func() {
		log.FinishEventLog(ctx)
	}))

	registry.AddMetric(g.outgoing.gauge)
	g.clientsMu.breakers = map[string]*circuit.Breaker{}
	log.Infof(g.ctx, "initial resolvers: %s", resolvers)
	g.SetResolvers(resolvers)

	g.mu.Lock()
	// Add ourselves as a SystemConfig watcher.
	g.mu.is.registerCallback(KeySystemConfig, g.updateSystemConfig)
	// Add ourselves as a node descriptor watcher.
	g.mu.is.registerCallback(MakePrefixPattern(KeyNodeIDPrefix), g.updateNodeAddress)
	g.mu.Unlock()

	RegisterGossipServer(grpcServer, g.server)
	return g
}
コード例 #10
0
ファイル: server.go プロジェクト: yaojingguo/cockroach
// newServer creates and returns a server struct.
func newServer(ctx context.Context, stopper *stop.Stopper, registry *metric.Registry) *server {
	s := &server{
		ctx:           ctx,
		stopper:       stopper,
		tighten:       make(chan roachpb.NodeID, 1),
		nodeMetrics:   makeMetrics(),
		serverMetrics: makeMetrics(),
	}

	s.mu.is = newInfoStore(ctx, 0, util.UnresolvedAddr{}, stopper)
	s.mu.incoming = makeNodeSet(minPeers, metric.NewGauge(MetaConnectionsIncomingGauge))
	s.mu.nodeMap = make(map[util.UnresolvedAddr]serverInfo)
	s.mu.ready = make(chan struct{})

	registry.AddMetric(s.mu.incoming.gauge)
	registry.AddMetricStruct(s.nodeMetrics)

	return s
}
コード例 #11
0
func TestNodeSetAddAndRemoveNode(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(2, metric.NewGauge())
	node0 := roachpb.NodeID(1)
	node1 := roachpb.NodeID(2)
	nodes.addNode(node0)
	nodes.addNode(node1)
	if !nodes.hasNode(node0) || !nodes.hasNode(node1) {
		t.Error("failed to locate added nodes")
	}
	nodes.removeNode(node0)
	if nodes.hasNode(node0) || !nodes.hasNode(node1) {
		t.Error("failed to remove node0", nodes)
	}
	nodes.removeNode(node1)
	if nodes.hasNode(node0) || nodes.hasNode(node1) {
		t.Error("failed to remove node1", nodes)
	}
}
コード例 #12
0
ファイル: store_metrics.go プロジェクト: yaojingguo/cockroach
func newStoreMetrics() *StoreMetrics {
	storeRegistry := metric.NewRegistry()
	sm := &StoreMetrics{
		registry: storeRegistry,

		// Replica metrics.
		ReplicaCount:                  metric.NewCounter(metaReplicaCount),
		ReservedReplicaCount:          metric.NewCounter(metaReservedReplicaCount),
		RaftLeaderCount:               metric.NewGauge(metaRaftLeaderCount),
		RaftLeaderNotLeaseHolderCount: metric.NewGauge(metaRaftLeaderNotLeaseHolderCount),
		LeaseHolderCount:              metric.NewGauge(metaLeaseHolderCount),

		// Range metrics.
		AvailableRangeCount: metric.NewGauge(metaAvailableRangeCount),

		// Replication metrics.
		ReplicaAllocatorNoopCount:       metric.NewGauge(metaReplicaAllocatorNoopCount),
		ReplicaAllocatorRemoveCount:     metric.NewGauge(metaReplicaAllocatorRemoveCount),
		ReplicaAllocatorAddCount:        metric.NewGauge(metaReplicaAllocatorAddCount),
		ReplicaAllocatorRemoveDeadCount: metric.NewGauge(metaReplicaAllocatorRemoveDeadCount),

		// Lease request metrics.
		LeaseRequestSuccessCount: metric.NewCounter(metaLeaseRequestSuccessCount),
		LeaseRequestErrorCount:   metric.NewCounter(metaLeaseRequestErrorCount),

		// Storage metrics.
		LiveBytes:       metric.NewGauge(metaLiveBytes),
		KeyBytes:        metric.NewGauge(metaKeyBytes),
		ValBytes:        metric.NewGauge(metaValBytes),
		IntentBytes:     metric.NewGauge(metaIntentBytes),
		LiveCount:       metric.NewGauge(metaLiveCount),
		KeyCount:        metric.NewGauge(metaKeyCount),
		ValCount:        metric.NewGauge(metaValCount),
		IntentCount:     metric.NewGauge(metaIntentCount),
		IntentAge:       metric.NewGauge(metaIntentAge),
		GcBytesAge:      metric.NewGauge(metaGcBytesAge),
		LastUpdateNanos: metric.NewGauge(metaLastUpdateNanos),
		Capacity:        metric.NewGauge(metaCapacity),
		Available:       metric.NewGauge(metaAvailable),
		Reserved:        metric.NewCounter(metaReserved),
		SysBytes:        metric.NewGauge(metaSysBytes),
		SysCount:        metric.NewGauge(metaSysCount),

		// RocksDB metrics.
		RdbBlockCacheHits:           metric.NewGauge(metaRdbBlockCacheHits),
		RdbBlockCacheMisses:         metric.NewGauge(metaRdbBlockCacheMisses),
		RdbBlockCacheUsage:          metric.NewGauge(metaRdbBlockCacheUsage),
		RdbBlockCachePinnedUsage:    metric.NewGauge(metaRdbBlockCachePinnedUsage),
		RdbBloomFilterPrefixChecked: metric.NewGauge(metaRdbBloomFilterPrefixChecked),
		RdbBloomFilterPrefixUseful:  metric.NewGauge(metaRdbBloomFilterPrefixUseful),
		RdbMemtableHits:             metric.NewGauge(metaRdbMemtableHits),
		RdbMemtableMisses:           metric.NewGauge(metaRdbMemtableMisses),
		RdbMemtableTotalSize:        metric.NewGauge(metaRdbMemtableTotalSize),
		RdbFlushes:                  metric.NewGauge(metaRdbFlushes),
		RdbCompactions:              metric.NewGauge(metaRdbCompactions),
		RdbTableReadersMemEstimate:  metric.NewGauge(metaRdbTableReadersMemEstimate),
		RdbReadAmplification:        metric.NewGauge(metaRdbReadAmplification),

		// Range event metrics.
		RangeSplits:                     metric.NewCounter(metaRangeSplits),
		RangeAdds:                       metric.NewCounter(metaRangeAdds),
		RangeRemoves:                    metric.NewCounter(metaRangeRemoves),
		RangeSnapshotsGenerated:         metric.NewCounter(metaRangeSnapshotsGenerated),
		RangeSnapshotsNormalApplied:     metric.NewCounter(metaRangeSnapshotsNormalApplied),
		RangeSnapshotsPreemptiveApplied: metric.NewCounter(metaRangeSnapshotsPreemptiveApplied),

		// Raft processing metrics.
		RaftTicks:                metric.NewCounter(metaRaftTicks),
		RaftSelectDurationNanos:  metric.NewCounter(metaRaftSelectDurationNanos),
		RaftWorkingDurationNanos: metric.NewCounter(metaRaftWorkingDurationNanos),
		RaftTickingDurationNanos: metric.NewCounter(metaRaftTickingDurationNanos),

		// Raft message metrics.
		RaftRcvdMsgProp:           metric.NewCounter(metaRaftRcvdProp),
		RaftRcvdMsgApp:            metric.NewCounter(metaRaftRcvdApp),
		RaftRcvdMsgAppResp:        metric.NewCounter(metaRaftRcvdAppResp),
		RaftRcvdMsgVote:           metric.NewCounter(metaRaftRcvdVote),
		RaftRcvdMsgVoteResp:       metric.NewCounter(metaRaftRcvdVoteResp),
		RaftRcvdMsgSnap:           metric.NewCounter(metaRaftRcvdSnap),
		RaftRcvdMsgHeartbeat:      metric.NewCounter(metaRaftRcvdHeartbeat),
		RaftRcvdMsgHeartbeatResp:  metric.NewCounter(metaRaftRcvdHeartbeatResp),
		RaftRcvdMsgTransferLeader: metric.NewCounter(metaRaftRcvdTransferLeader),
		RaftRcvdMsgTimeoutNow:     metric.NewCounter(metaRaftRcvdTimeoutNow),
		raftRcvdMessages:          make(map[raftpb.MessageType]*metric.Counter, len(raftpb.MessageType_name)),

		RaftEnqueuedPending: metric.NewGauge(metaRaftEnqueuedPending),
	}

	sm.raftRcvdMessages[raftpb.MsgProp] = sm.RaftRcvdMsgProp
	sm.raftRcvdMessages[raftpb.MsgApp] = sm.RaftRcvdMsgApp
	sm.raftRcvdMessages[raftpb.MsgAppResp] = sm.RaftRcvdMsgAppResp
	sm.raftRcvdMessages[raftpb.MsgVote] = sm.RaftRcvdMsgVote
	sm.raftRcvdMessages[raftpb.MsgVoteResp] = sm.RaftRcvdMsgVoteResp
	sm.raftRcvdMessages[raftpb.MsgSnap] = sm.RaftRcvdMsgSnap
	sm.raftRcvdMessages[raftpb.MsgHeartbeat] = sm.RaftRcvdMsgHeartbeat
	sm.raftRcvdMessages[raftpb.MsgHeartbeatResp] = sm.RaftRcvdMsgHeartbeatResp
	sm.raftRcvdMessages[raftpb.MsgTransferLeader] = sm.RaftRcvdMsgTransferLeader
	sm.raftRcvdMessages[raftpb.MsgTimeoutNow] = sm.RaftRcvdMsgTimeoutNow

	storeRegistry.AddMetricStruct(sm)

	return sm
}
コード例 #13
0
ファイル: runtime.go プロジェクト: yaojingguo/cockroach
// MakeRuntimeStatSampler constructs a new RuntimeStatSampler object.
func MakeRuntimeStatSampler(clock *hlc.Clock) RuntimeStatSampler {
	// Construct the build info metric. It is constant.
	// We first build set the labels on the metadata.
	info := build.GetInfo()
	timestamp, err := info.Timestamp()
	if err != nil {
		// We can't panic here, tests don't have a build timestamp.
		log.Warningf(context.TODO(), "Could not parse build timestamp: %v", err)
	}

	metaBuildTimestamp.AddLabel("tag", info.Tag)
	metaBuildTimestamp.AddLabel("go_version", info.GoVersion)

	buildTimestamp := metric.NewGauge(metaBuildTimestamp)
	buildTimestamp.Update(timestamp)

	return RuntimeStatSampler{
		clock:          clock,
		startTimeNanos: clock.PhysicalNow(),
		CgoCalls:       metric.NewGauge(metaCgoCalls),
		Goroutines:     metric.NewGauge(metaGoroutines),
		GoAllocBytes:   metric.NewGauge(metaGoAllocBytes),
		GoTotalBytes:   metric.NewGauge(metaGoTotalBytes),
		CgoAllocBytes:  metric.NewGauge(metaCgoAllocBytes),
		CgoTotalBytes:  metric.NewGauge(metaCgoTotalBytes),
		GcCount:        metric.NewGauge(metaGCCount),
		GcPauseNS:      metric.NewGauge(metaGCPauseNS),
		GcPausePercent: metric.NewGaugeFloat64(metaGCPausePercent),
		CPUUserNS:      metric.NewGauge(metaCPUUserNS),
		CPUUserPercent: metric.NewGaugeFloat64(metaCPUUserPercent),
		CPUSysNS:       metric.NewGauge(metaCPUSysNS),
		CPUSysPercent:  metric.NewGaugeFloat64(metaCPUSysPercent),
		Rss:            metric.NewGauge(metaRSS),
		Uptime:         metric.NewGauge(metaUptime),
		BuildTimestamp: buildTimestamp,
	}
}
コード例 #14
0
ファイル: recorder_test.go プロジェクト: yaojingguo/cockroach
// TestMetricsRecorder verifies that the metrics recorder properly formats the
// statistics from various registries, both for Time Series and for Status
// Summaries.
func TestMetricsRecorder(t *testing.T) {
	defer leaktest.AfterTest(t)()

	// ========================================
	// Construct a series of fake descriptors for use in test.
	// ========================================
	nodeDesc := roachpb.NodeDescriptor{
		NodeID: roachpb.NodeID(1),
	}
	storeDesc1 := roachpb.StoreDescriptor{
		StoreID: roachpb.StoreID(1),
		Capacity: roachpb.StoreCapacity{
			Capacity:  100,
			Available: 50,
		},
	}
	storeDesc2 := roachpb.StoreDescriptor{
		StoreID: roachpb.StoreID(2),
		Capacity: roachpb.StoreCapacity{
			Capacity:  200,
			Available: 75,
		},
	}

	// ========================================
	// Create registries and add them to the recorder (two node-level, two
	// store-level).
	// ========================================
	reg1 := metric.NewRegistry()
	store1 := fakeStore{
		storeID:  roachpb.StoreID(1),
		desc:     storeDesc1,
		registry: metric.NewRegistry(),
	}
	store2 := fakeStore{
		storeID:  roachpb.StoreID(2),
		desc:     storeDesc2,
		registry: metric.NewRegistry(),
	}
	manual := hlc.NewManualClock(100)
	recorder := NewMetricsRecorder(hlc.NewClock(manual.UnixNano))
	recorder.AddStore(store1)
	recorder.AddStore(store2)
	recorder.AddNode(reg1, nodeDesc, 50)

	// Ensure the metric system's view of time does not advance during this test
	// as the test expects time to not advance too far which would age the actual
	// data (e.g. in histogram's) unexpectedly.
	defer metric.TestingSetNow(func() time.Time {
		return time.Unix(0, manual.UnixNano()).UTC()
	})()

	// ========================================
	// Generate Metrics Data & Expected Results
	// ========================================

	// Flatten the four registries into an array for ease of use.
	regList := []struct {
		reg    *metric.Registry
		prefix string
		source int64
		isNode bool
	}{
		{
			reg:    reg1,
			prefix: "one.",
			source: 1,
			isNode: true,
		},
		{
			reg:    reg1,
			prefix: "two.",
			source: 1,
			isNode: true,
		},
		{
			reg:    store1.registry,
			prefix: "",
			source: int64(store1.storeID),
			isNode: false,
		},
		{
			reg:    store2.registry,
			prefix: "",
			source: int64(store2.storeID),
			isNode: false,
		},
	}

	// Every registry will have a copy of the following metrics.
	metricNames := []struct {
		name string
		typ  string
		val  int64
	}{
		{"testGauge", "gauge", 20},
		{"testGaugeFloat64", "floatgauge", 20},
		{"testCounter", "counter", 5},
		{"testRate", "rate", 2},
		{"testHistogram", "histogram", 10},
		{"testLatency", "latency", 10},

		// Stats needed for store summaries.
		{"ranges", "counter", 1},
		{"replicas.leaders", "gauge", 1},
		{"replicas.leaseholders", "gauge", 1},
		{"ranges.available", "gauge", 1},
	}

	// Add the metrics to each registry and set their values. At the same time,
	// generate expected time series results and status summary metric values.
	var expected []tspb.TimeSeriesData
	expectedNodeSummaryMetrics := make(map[string]float64)
	expectedStoreSummaryMetrics := make(map[string]float64)

	// addExpected generates expected data for a single metric data point.
	addExpected := func(prefix, name string, source, time, val int64, isNode bool) {
		// Generate time series data.
		tsPrefix := "cr.node."
		if !isNode {
			tsPrefix = "cr.store."
		}
		expect := tspb.TimeSeriesData{
			Name:   tsPrefix + prefix + name,
			Source: strconv.FormatInt(source, 10),
			Datapoints: []tspb.TimeSeriesDatapoint{
				{
					TimestampNanos: time,
					Value:          float64(val),
				},
			},
		}
		expected = append(expected, expect)

		// Generate status summary data.
		if isNode {
			expectedNodeSummaryMetrics[prefix+name] = float64(val)
		} else {
			// This can overwrite the previous value, but this is expected as
			// all stores in our tests have identical values; when comparing
			// status summaries, the same map is used as expected data for all
			// stores.
			expectedStoreSummaryMetrics[prefix+name] = float64(val)
		}
	}

	for _, reg := range regList {
		for _, data := range metricNames {
			switch data.typ {
			case "gauge":
				g := metric.NewGauge(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(g)
				g.Update(data.val)
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "floatgauge":
				g := metric.NewGaugeFloat64(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(g)
				g.Update(float64(data.val))
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "counter":
				c := metric.NewCounter(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(c)
				c.Inc((data.val))
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "rate":
				r := metric.NewRates(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetricGroup(r)
				r.Add(data.val)
				addExpected(reg.prefix, data.name+"-count", reg.source, 100, data.val, reg.isNode)
				for _, scale := range metric.DefaultTimeScales {
					// Rate data is subject to timing errors in tests. Zero out
					// these values.
					addExpected(reg.prefix, data.name+sep+scale.Name(), reg.source, 100, 0, reg.isNode)
				}
			case "histogram":
				h := metric.NewHistogram(metric.Metadata{Name: reg.prefix + data.name}, time.Second, 1000, 2)
				reg.reg.AddMetric(h)
				h.RecordValue(data.val)
				for _, q := range recordHistogramQuantiles {
					addExpected(reg.prefix, data.name+q.suffix, reg.source, 100, data.val, reg.isNode)
				}
			case "latency":
				l := metric.NewLatency(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetricGroup(l)
				l.RecordValue(data.val)
				// Latency is simply three histograms (at different resolution
				// time scales).
				for _, scale := range metric.DefaultTimeScales {
					for _, q := range recordHistogramQuantiles {
						addExpected(reg.prefix, data.name+sep+scale.Name()+q.suffix, reg.source, 100, data.val, reg.isNode)
					}
				}
			}
		}
	}

	// ========================================
	// Verify time series data
	// ========================================
	actual := recorder.GetTimeSeriesData()

	// Zero-out timing-sensitive rate values from actual data.
	for _, act := range actual {
		match, err := regexp.MatchString(`testRate-\d+m`, act.Name)
		if err != nil {
			t.Fatal(err)
		}
		if match {
			act.Datapoints[0].Value = 0.0
		}
	}

	// Actual comparison is simple: sort the resulting arrays by time and name,
	// and use reflect.DeepEqual.
	sort.Sort(byTimeAndName(actual))
	sort.Sort(byTimeAndName(expected))
	if a, e := actual, expected; !reflect.DeepEqual(a, e) {
		t.Errorf("recorder did not yield expected time series collection; diff:\n %v", pretty.Diff(e, a))
	}

	// ========================================
	// Verify node summary generation
	// ========================================
	expectedNodeSummary := &NodeStatus{
		Desc:      nodeDesc,
		BuildInfo: build.GetInfo(),
		StartedAt: 50,
		UpdatedAt: 100,
		Metrics:   expectedNodeSummaryMetrics,
		StoreStatuses: []StoreStatus{
			{
				Desc:    storeDesc1,
				Metrics: expectedStoreSummaryMetrics,
			},
			{
				Desc:    storeDesc2,
				Metrics: expectedStoreSummaryMetrics,
			},
		},
	}

	nodeSummary := recorder.GetStatusSummary()
	if nodeSummary == nil {
		t.Fatalf("recorder did not return nodeSummary.")
	}

	sort.Sort(byStoreDescID(nodeSummary.StoreStatuses))
	if a, e := nodeSummary, expectedNodeSummary; !reflect.DeepEqual(a, e) {
		t.Errorf("recorder did not produce expected NodeSummary; diff:\n %v", pretty.Diff(e, a))
	}
}