Try to operate on multiple metrics if channels if filled

internal/metricRouter/metricRouter.go

@@ -14,6 +14,8 @@ import (
 	mct "github.com/ClusterCockpit/cc-metric-collector/internal/multiChanTicker"
 )
 
+const ROUTER_MAX_FORWARD = 50
+
 // Metric router tag configuration
 type metricRouterTagConfig struct {
 	Key       string `json:"key"`   // Tag name
@@ -49,6 +51,7 @@ type metricRouter struct {
 	config      metricRouterConfig  // json encoded config for metric router
 	cache       MetricCache         // pointer to MetricCache
 	cachewg     sync.WaitGroup      // wait group for MetricCache
+	maxForward  int                 // number of metrics to forward maximally in one iteration
 }
 
 // MetricRouter access functions
@@ -73,6 +76,7 @@ func (r *metricRouter) Init(ticker mct.MultiChanTicker, wg *sync.WaitGroup, rout
 	r.cache_input = make(chan lp.CCMetric)
 	r.wg = wg
 	r.ticker = ticker
+	r.maxForward = ROUTER_MAX_FORWARD
 
 	// Set hostname
 	hostname, err := os.Hostname()
@@ -242,21 +246,8 @@ func (r *metricRouter) Start() {
 		}
 	}
 
-	// Start Metric Cache
-	if r.config.NumCacheIntervals > 0 {
-		r.cache.Start()
-	}
-
-	r.wg.Add(1)
-	go func() {
-		defer r.wg.Done()
-		for {
-			select {
-			case <-r.done:
-				done()
-				return
-
-			case p := <-r.coll_input:
+	// Foward message received from collector channel
+	coll_forward := func(p lp.CCMetric) {
 		// receive from metric collector
 		p.AddTag("hostname", r.hostname)
 		if r.config.IntervalStamp {
@@ -270,8 +261,10 @@ func (r *metricRouter) Start() {
 		if r.config.NumCacheIntervals > 0 {
 			r.cache.Add(p)
 		}
+	}
 
-			case p := <-r.recv_input:
+	// Foward message received from receivers channel
+	recv_forward := func(p lp.CCMetric) {
 		// receive from receive manager
 		if r.config.IntervalStamp {
 			p.SetTime(r.timestamp)
@@ -279,14 +272,50 @@ func (r *metricRouter) Start() {
 		if !r.dropMetric(p) {
 			forward(p)
 		}
+	}
 
-			case p := <-r.cache_input:
+	// Foward message received from cache channel
+	cache_forward := func(p lp.CCMetric) {
 		// receive from metric collector
 		if !r.dropMetric(p) {
 			p.AddTag("hostname", r.hostname)
 			forward(p)
 		}
 	}
+
+	// Start Metric Cache
+	if r.config.NumCacheIntervals > 0 {
+		r.cache.Start()
+	}
+
+	r.wg.Add(1)
+	go func() {
+		defer r.wg.Done()
+
+		for {
+			select {
+			case <-r.done:
+				done()
+				return
+
+			case p := <-r.coll_input:
+				coll_forward(p)
+				for i := 0; len(r.coll_input) > 0 && i < r.maxForward; i++ {
+					coll_forward(<-r.coll_input)
+				}
+
+			case p := <-r.recv_input:
+				recv_forward(p)
+				for i := 0; len(r.recv_input) > 0 && i < r.maxForward; i++ {
+					recv_forward(<-r.recv_input)
+				}
+
+			case p := <-r.cache_input:
+				cache_forward(p)
+				for i := 0; len(r.cache_input) > 0 && i < r.maxForward; i++ {
+					cache_forward(<-r.cache_input)
+				}
+			}
 		}
 	}()
 	cclog.ComponentDebug("MetricRouter", "STARTED")

sinks/sinkManager.go

@@ -10,6 +10,8 @@ import (
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
 )
 
+const SINK_MAX_FORWARD = 50
+
 // Map of all available sinks
 var AvailableSinks = map[string]Sink{
 	"influxdb":    new(InfluxSink),
@@ -26,6 +28,7 @@ type sinkManager struct {
 	done       chan bool        // channel to finish / stop metric sink manager
 	wg         *sync.WaitGroup  // wait group for all goroutines in cc-metric-collector
 	sinks      map[string]Sink  // Mapping sink name to sink
+	maxForward int              // number of metrics to write maximally in one iteration
 }
 
 // Sink manager access functions
@@ -45,6 +48,7 @@ func (sm *sinkManager) Init(wg *sync.WaitGroup, sinkConfigFile string) error {
 	sm.done = make(chan bool)
 	sm.wg = wg
 	sm.sinks = make(map[string]Sink, 0)
+	sm.maxForward = SINK_MAX_FORWARD
 
 	if len(sinkConfigFile) == 0 {
 		return nil
@@ -97,12 +101,8 @@ func (sm *sinkManager) Start() {
 		}
 
 		for {
-			select {
-			case <-sm.done:
-				done()
-				return
 
-			case p := <-sm.input:
+			toTheSinks := func(p lp.CCMetric) {
 				// Send received metric to all outputs
 				cclog.ComponentDebug("SinkManager", "WRITE", p)
 				for _, s := range sm.sinks {
@@ -111,6 +111,19 @@ func (sm *sinkManager) Start() {
 					}
 				}
 			}
+
+			select {
+			case <-sm.done:
+				done()
+				return
+
+			case p := <-sm.input:
+				toTheSinks(p)
+				for i := 0; len(sm.input) > 0 && i < sm.maxForward; i++ {
+					p := <-sm.input
+					toTheSinks(p)
+				}
+			}
 		}
 	}()