Merge latest development changes (#80)

* Cleanup: Remove unused code

* Use Golang duration parser for 'interval' and 'duration'
 in main config

* Update handling of LIKWID headers. Download only if not already present in the system. Fixes #73

* Units with cc-units (#64)

* Add option to normalize units with cc-unit

* Add unit conversion to router

* Add option to change unit prefix in the router

* Add to MetricRouter README

* Add order of operations in router to README

* Use second add_tags/del_tags only if metric gets renamed

* Skip disks in DiskstatCollector that have size=0

* Check readability of sensor files in TempCollector

* Fix for --once option

* Rename `cpu` type to `hwthread` (#69)

* Rename 'cpu' type to 'hwthread' to avoid naming clashes with MetricStore and CC-Webfrontend

* Collectors in parallel (#74)

* Provide info to CollectorManager whether the collector can be executed in parallel with others

* Split serial and parallel collectors. Read in parallel first

* Update NvidiaCollector with new metrics, MIG and NvLink support (#75)

* CC topology module update (#76)

* Rename CPU to hardware thread, write some comments

* Do renaming in other parts

* Remove CpuList and SocketList function from metricCollector. Available in ccTopology

* Option to use MIG UUID as subtype-id in NvidiaCollector

* Option to use MIG slice name as subtype-id in NvidiaCollector

* MetricRouter: Fix JSON in README

* Fix for Github Action to really use the selected version

* Remove Ganglia installation in runonce Action and add Go 1.18

* Fix daemon options in init script

* Add separate go.mod files to use it with deprecated 1.16

* Minor updates for Makefiles

* fix string comparison

* AMD ROCm SMI collector (#77)

* Add collector for AMD ROCm SMI metrics

* Fix import path

* Fix imports

* Remove Board Number

* store GPU index explicitly

* Remove board number from description

* Use http instead of ftp to download likwid

* Fix serial number in rocmCollector

* Improved http sink (#78)

* automatic flush in NatsSink

* tweak default options of HttpSink

* shorter cirt. section and retries for HttpSink

* fix error handling

* Remove file added by mistake.

* Use http instead of ftp to download likwid

* Fix serial number in rocmCollector

Co-authored-by: Thomas Roehl <thomas.roehl@fau.de>

* Fix: When sending metrics failed the batch size could be exceeded

* Improved dropping of metrics failed to send

* Add memstats and topprocs metric

* Updated to latest modules

* Check that at least one sink is running

* Add drop rate, when send buffer is full

* Allow only one timer at a time

* Use mutex to ensure only on flush timer is running

* Fix for NvidiaCollector when devices are not in MiG mode

* Remove Golang version 1.16 an 1.17 from Action. Latest commits require Golang 1.18

* Use Golang 1.18 in Release action to build RPMs

* Change unit of CpufreqCollector to Hz. That's what the sysfs outputs

* Make wget quiet in Release action to reduce log size

Co-authored-by: Holger Obermaier <40787752+ho-ob@users.noreply.github.com>
Co-authored-by: Lou <lou.knauer@gmx.de>

sinks/influxSink.go

@@ -29,15 +29,23 @@ type InfluxSink struct {
 		Password     string `json:"password,omitempty"`
 		Organization string `json:"organization,omitempty"`
 		SSL          bool   `json:"ssl,omitempty"`
-		// Maximum number of points sent to server in single request. Default 100
+		// Maximum number of points sent to server in single request.
+		// Default: 1000
 		BatchSize int `json:"batch_size,omitempty"`
-		// Interval, in which is buffer flushed if it has not been already written (by reaching batch size). Default 1s
+		// Time interval for delayed sending of metrics.
+		// If the buffers are already filled before the end of this interval,
+		// the metrics are sent without further delay.
+		// Default: 1s
 		FlushInterval string `json:"flush_delay,omitempty"`
+		// Number of metrics that are dropped when buffer is full
+		// Default: 100
+		DropRate int `json:"drop_rate,omitempty"`
 	}
-	batch      []*write.Point
-	flushTimer *time.Timer
-	flushDelay time.Duration
-	lock       sync.Mutex // Flush() runs in another goroutine, so this lock has to protect the buffer
+	batch           []*write.Point
+	flushTimer      *time.Timer
+	flushDelay      time.Duration
+	batchMutex      sync.Mutex // Flush() runs in another goroutine, so this lock has to protect the buffer
+	flushTimerMutex sync.Mutex // Ensure only one flush timer is running
 }
 
 // connect connects to the InfluxDB server
@@ -62,7 +70,10 @@ func (s *InfluxSink) connect() error {
 	} else {
 		auth = fmt.Sprintf("%s:%s", s.config.User, s.config.Password)
 	}
-	cclog.ComponentDebug(s.name, "Using URI", uri, "Org", s.config.Organization, "Bucket", s.config.Database)
+	cclog.ComponentDebug(s.name,
+		"Using URI='"+uri+"'",
+		"Org='"+s.config.Organization+"'",
+		"Bucket='"+s.config.Database+"'")
 
 	// Set influxDB client options
 	clientOptions := influxdb2.DefaultOptions()
@@ -93,47 +104,64 @@ func (s *InfluxSink) connect() error {
 
 func (s *InfluxSink) Write(m lp.CCMetric) error {
 
-	if len(s.batch) == 0 && s.flushDelay != 0 {
-		// This is the first write since the last flush, start the flushTimer!
-		if s.flushTimer != nil && s.flushTimer.Stop() {
-			cclog.ComponentDebug(s.name, "unexpected: the flushTimer was already running?")
-		}
-
-		// Run a batched flush for all lines that have arrived in the last flush delay interval
+	if s.flushDelay != 0 && s.flushTimerMutex.TryLock() {
+		// Run a batched flush for all metrics that arrived in the last flush delay interval
+		cclog.ComponentDebug(s.name, "Starting new flush timer")
 		s.flushTimer = time.AfterFunc(
 			s.flushDelay,
 			func() {
+				defer s.flushTimerMutex.Unlock()
+				cclog.ComponentDebug(s.name, "Starting flush in flush timer")
 				if err := s.Flush(); err != nil {
-					cclog.ComponentError(s.name, "flush failed:", err.Error())
+					cclog.ComponentError(s.name, "Flush timer: flush failed:", err)
 				}
 			})
 	}
 
+	// Lock access to batch slice
+	s.batchMutex.Lock()
+
+	// batch slice full, dropping oldest metric(s)
+	// e.g. when previous flushes failed and batch slice was not cleared
+	if len(s.batch) == s.config.BatchSize {
+		newSize := s.config.BatchSize - s.config.DropRate
+
+		for i := 0; i < newSize; i++ {
+			s.batch[i] = s.batch[i+s.config.DropRate]
+		}
+		for i := newSize; i < s.config.BatchSize; i++ {
+			s.batch[i] = nil
+		}
+		s.batch = s.batch[:newSize]
+		cclog.ComponentError(s.name, "Batch slice full, dropping", s.config.DropRate, "oldest metric(s)")
+	}
+
 	// Append metric to batch slice
 	p := m.ToPoint(s.meta_as_tags)
-	s.lock.Lock()
 	s.batch = append(s.batch, p)
-	s.lock.Unlock()
 
 	// Flush synchronously if "flush_delay" is zero
-	if s.flushDelay == 0 {
-		return s.Flush()
-	}
-
+	// or
 	// Flush if batch size is reached
-	if len(s.batch) == s.config.BatchSize {
+	if s.flushDelay == 0 ||
+		len(s.batch) == s.config.BatchSize {
+		// Unlock access to batch slice
+		s.batchMutex.Unlock()
 		return s.Flush()
 	}
 
+	// Unlock access to batch slice
+	s.batchMutex.Unlock()
 	return nil
 }
 
 // Flush sends all metrics buffered in batch slice to InfluxDB server
 func (s *InfluxSink) Flush() error {
+	cclog.ComponentDebug(s.name, "Flushing")
 
 	// Lock access to batch slice
-	s.lock.Lock()
-	defer s.lock.Unlock()
+	s.batchMutex.Lock()
+	defer s.batchMutex.Unlock()
 
 	// Nothing to do, batch slice is empty
 	if len(s.batch) == 0 {
@@ -143,7 +171,7 @@ func (s *InfluxSink) Flush() error {
 	// Send metrics from batch slice
 	err := s.writeApi.WritePoint(context.Background(), s.batch...)
 	if err != nil {
-		cclog.ComponentError(s.name, "flush failed:", err.Error())
+		cclog.ComponentError(s.name, "Flush(): Flush of", len(s.batch), "metrics failed:", err)
 		return err
 	}
 
@@ -160,6 +188,9 @@ func (s *InfluxSink) Close() {
 	cclog.ComponentDebug(s.name, "Closing InfluxDB connection")
 	s.flushTimer.Stop()
 	s.Flush()
+	if err := s.Flush(); err != nil {
+		cclog.ComponentError(s.name, "Close(): Flush failed:", err)
+	}
 	s.client.Close()
 }
 
@@ -169,31 +200,32 @@ func NewInfluxSink(name string, config json.RawMessage) (Sink, error) {
 	s.name = fmt.Sprintf("InfluxSink(%s)", name)
 
 	// Set config default values
-	s.config.BatchSize = 100
+	s.config.BatchSize = 1000
 	s.config.FlushInterval = "1s"
+	s.config.DropRate = 100
 
 	// Read config
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &s.config)
 		if err != nil {
-			return nil, err
+			return s, err
 		}
 	}
 
 	if len(s.config.Host) == 0 {
-		return nil, errors.New("Missing host configuration required by InfluxSink")
+		return s, errors.New("Missing host configuration required by InfluxSink")
 	}
 	if len(s.config.Port) == 0 {
-		return nil, errors.New("Missing port configuration required by InfluxSink")
+		return s, errors.New("Missing port configuration required by InfluxSink")
 	}
 	if len(s.config.Database) == 0 {
-		return nil, errors.New("Missing database configuration required by InfluxSink")
+		return s, errors.New("Missing database configuration required by InfluxSink")
 	}
 	if len(s.config.Organization) == 0 {
-		return nil, errors.New("Missing organization configuration required by InfluxSink")
+		return s, errors.New("Missing organization configuration required by InfluxSink")
 	}
 	if len(s.config.Password) == 0 {
-		return nil, errors.New("Missing password configuration required by InfluxSink")
+		return s, errors.New("Missing password configuration required by InfluxSink")
 	}
 
 	// Create lookup map to use meta infos as tags in the output metric
@@ -210,12 +242,24 @@ func NewInfluxSink(name string, config json.RawMessage) (Sink, error) {
 		}
 	}
 
+	if !(s.config.BatchSize > 0) {
+		return s, fmt.Errorf("batch_size=%d in InfluxDB config must be > 0", s.config.BatchSize)
+	}
+	if !(s.config.DropRate > 0) {
+		return s, fmt.Errorf("drop_rate=%d in InfluxDB config must be > 0", s.config.DropRate)
+	}
+	if !(s.config.BatchSize > s.config.DropRate) {
+		return s, fmt.Errorf(
+			"batch_size=%d must be greater then drop_rate=%d in InfluxDB config",
+			s.config.BatchSize, s.config.DropRate)
+	}
+
 	// allocate batch slice
 	s.batch = make([]*write.Point, 0, s.config.BatchSize)
 
 	// Connect to InfluxDB server
 	if err := s.connect(); err != nil {
-		return nil, fmt.Errorf("unable to connect: %v", err)
+		return s, fmt.Errorf("unable to connect: %v", err)
 	}
 	return s, nil
 }

sinks/sinkManager.go

@@ -76,11 +76,17 @@ func (sm *sinkManager) Init(wg *sync.WaitGroup, sinkConfigFile string) error {
 	for name, raw := range rawConfigs {
 		err = sm.AddOutput(name, raw)
 		if err != nil {
-			cclog.ComponentError("SinkManager", err.Error())
+			cclog.ComponentError("SinkManager", err)
 			continue
 		}
 	}
 
+	// Check that at least one sink is running
+	if !(len(sm.sinks) > 0) {
+		cclog.ComponentError("SinkManager", "Found no usable sinks")
+		return fmt.Errorf("Found no usable sinks")
+	}
+
 	return nil
 }