Remove WithUnit query option

Makefile

@@ -2,13 +2,13 @@
 APP = cc-metric-store
 GOSRC_APP        := cc-metric-store.go
 GOSRC_FILES      := api.go \
-		    memstore.go \
-		    archive.go \
-		    debug.go \
-		    float.go \
-		    lineprotocol.go \
-		    selector.go \
-		    stats.go
+					memstore.go \
+					archive.go \
+					debug.go \
+					float.go \
+					lineprotocol.go \
+					selector.go \
+					stats.go
 
 
 
@@ -18,7 +18,7 @@ BINDIR ?= bin
 .PHONY: all
 all: $(APP)
 
-$(APP): $(GOSRC)
+$(APP): $(GOSRC) $(GOSRC_APP)
 	go get
 	go build -o $(APP) $(GOSRC_APP) $(GOSRC_FILES)
 

api.go

@@ -30,6 +30,7 @@ type ApiMetricData struct {
 	Avg   Float      `json:"avg"`
 	Min   Float      `json:"min"`
 	Max   Float      `json:"max"`
+	Unit  string     `json:"unit,omitempty"`
 }
 
 // TODO: Optimize this, just like the stats endpoint!
@@ -182,6 +183,7 @@ type ApiQueryRequest struct {
 	From        int64      `json:"from"`
 	To          int64      `json:"to"`
 	WithStats   bool       `json:"with-stats"`
+	WithUnit    bool       `json:"with-unit,omitempty"`
 	WithData    bool       `json:"with-data"`
 	WithPadding bool       `json:"with-padding"`
 	Queries     []ApiQuery `json:"queries"`
@@ -281,7 +283,7 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
 		res := make([]ApiMetricData, 0, len(sels))
 		for _, sel := range sels {
 			data := ApiMetricData{}
-			data.Data, data.From, data.To, err = memoryStore.Read(sel, query.Metric, req.From, req.To)
+			data.Data, data.From, data.To, data.Unit, err = memoryStore.Read(sel, query.Metric, req.From, req.To)
 			// log.Printf("data: %#v, %#v, %#v, %#v", data.Data, data.From, data.To, err)
 			if err != nil {
 				msg := err.Error()

archive.go

@@ -24,6 +24,7 @@ import (
 type CheckpointMetrics struct {
 	Frequency int64   `json:"frequency"`
 	Start     int64   `json:"start"`
+	Unit      string  `json:"unit,omitempty"`
 	Data      []Float `json:"data"`
 }
 
@@ -36,6 +37,7 @@ func (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {
 	buf = strconv.AppendInt(buf, cm.Frequency, 10)
 	buf = append(buf, `,"start":`...)
 	buf = strconv.AppendInt(buf, cm.Start, 10)
+	buf = append(buf, fmt.Sprintf(`,"unit":"%s"`, cm.Unit)...)
 	buf = append(buf, `,"data":[`...)
 	for i, x := range cm.Data {
 		if i != 0 {
@@ -179,6 +181,7 @@ func (l *level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFil
 			Frequency: b.frequency,
 			Start:     start,
 			Data:      data,
+			Unit:      b.unit,
 		}
 	}
 
@@ -309,6 +312,7 @@ func (l *level) loadFile(cf *CheckpointFile, m *MemoryStore) error {
 			frequency: metric.Frequency,
 			start:     metric.Start,
 			data:      metric.Data[0:n:n], // Space is wasted here :(
+			unit:      metric.Unit,
 			prev:      nil,
 			next:      nil,
 			archived:  true,

archive_test.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestFromCheckpoint(t *testing.T) {
+	m := NewMemoryStore(map[string]MetricConfig{
+		"cpi":       {Frequency: 5, Aggregation: AvgAggregation},
+		"flops_any": {Frequency: 5, Aggregation: SumAggregation},
+		"flops_dp":  {Frequency: 5, Aggregation: SumAggregation},
+		"flops_sp":  {Frequency: 5, Aggregation: SumAggregation},
+	})
+
+	startupTime := time.Now()
+	files, err := m.FromCheckpoint("./testdata/checkpoints", 1692628930)
+	loadedData := m.SizeInBytes() / 1024 / 1024 // In MB
+	if err != nil {
+		t.Fatal(err)
+	} else {
+		log.Printf("Checkpoints loaded (%d files, %d MB, that took %fs)\n", files, loadedData, time.Since(startupTime).Seconds())
+	}
+
+	m.DebugDump(bufio.NewWriter(os.Stdout), nil)
+
+	if files != 2 {
+		t.Errorf("expected: %d, got: %d\n", 2, files)
+	}
+}

config.json

@@ -1,27 +1,23 @@
 {
     "metrics": {
+        "cpi":  { "frequency": 15, "aggregation": "avg" },
         "flops_any":  { "frequency": 15, "aggregation": "sum" },
         "flops_dp":   { "frequency": 15, "aggregation": "sum" },
-        "flops_sp":   { "frequency": 15, "aggregation": "sum" },
-        "mem_bw":     { "frequency": 15, "aggregation": "sum" },
-        "load_one":   { "frequency": 15, "aggregation": null  },
-        "load_five":  { "frequency": 15, "aggregation": null  }
+        "flops_sp":   { "frequency": 15, "aggregation": "sum" }
     },
     "checkpoints": {
         "interval": "12h",
-        "directory": "./var/checkpoints",
+        "directory": "./testdata/checkpoints",
         "restore": "48h"
     },
     "archive": {
         "interval": "168h",
-        "directory": "./var/archive"
+        "directory": "./testdata/archive"
     },
     "http-api": {
-        "address": "0.0.0.0:8081",
+        "address": "127.0.0.1:8081",
         "https-cert-file": null,
         "https-key-file": null
     },
-    "retention-in-memory": "48h",
-    "nats": null,
-    "jwt-public-key": "kzfYrYy+TzpanWZHJ5qSdMj5uKUWgq74BWhQG6copP0="
+    "retention-in-memory": "48h"
 }

debug.go

@@ -21,6 +21,9 @@ func (b *buffer) debugDump(buf []byte) []byte {
 	if b.archived {
 		buf = append(buf, `,"saved":true`...)
 	}
+	if b.unit != "" {
+		buf = append(buf, fmt.Sprintf(`,"unit":"%s"`, b.unit)...)
+	}
 	if b.next != nil {
 		buf = append(buf, `},`...)
 	} else {

lineprotocol.go

@@ -16,6 +16,7 @@ import (
 type Metric struct {
 	Name  string
 	Value Float
+	Unit  string
 
 	mc MetricConfig
 }
@@ -206,7 +207,7 @@ func decodeLine(dec *lineprotocol.Decoder, clusterDefault string) error {
 		}
 
 		typeBuf, subTypeBuf := typeBuf[:0], subTypeBuf[:0]
-		cluster, host := clusterDefault, ""
+		cluster, host, unit := clusterDefault, "", ""
 		for {
 			key, val, err := dec.NextTag()
 			if err != nil {
@@ -232,6 +233,8 @@ func decodeLine(dec *lineprotocol.Decoder, clusterDefault string) error {
 					host = string(val)
 					lvl = nil
 				}
+			case "unit":
+				unit = string(val)
 			case "type":
 				if string(val) == "node" {
 					break
@@ -300,6 +303,7 @@ func decodeLine(dec *lineprotocol.Decoder, clusterDefault string) error {
 			} else {
 				return fmt.Errorf("unsupported value type in message: %s", val.Kind().String())
 			}
+			metric.Unit = unit
 		}
 
 		if t, err = dec.Time(lineprotocol.Second, t); err != nil {

memstore.go

@@ -35,6 +35,7 @@ var (
 type buffer struct {
 	frequency  int64   // Time between two "slots"
 	start      int64   // Timestamp of when `data[0]` was written.
+	unit       string  // Unit for the data in this buffer
 	data       []Float // The slice should never reallocacte as `cap(data)` is respected.
 	prev, next *buffer // `prev` contains older data, `next` newer data.
 	archived   bool    // If true, this buffer is already archived
@@ -50,12 +51,13 @@ type buffer struct {
 	*/
 }
 
-func newBuffer(ts, freq int64) *buffer {
+func newBuffer(ts, freq int64, unit string) *buffer {
 	b := bufferPool.Get().(*buffer)
 	b.frequency = freq
 	b.start = ts - (freq / 2)
 	b.prev = nil
 	b.next = nil
+	b.unit = unit
 	b.archived = false
 	b.closed = false
 	b.data = b.data[:0]
@@ -74,7 +76,7 @@ func (b *buffer) write(ts int64, value Float) (*buffer, error) {
 	// idx := int((ts - b.start + (b.frequency / 3)) / b.frequency)
 	idx := int((ts - b.start) / b.frequency)
 	if idx >= cap(b.data) {
-		newbuf := newBuffer(ts, b.frequency)
+		newbuf := newBuffer(ts, b.frequency, b.unit)
 		newbuf.prev = b
 		b.next = newbuf
 		b.close()
@@ -412,7 +414,7 @@ func (m *MemoryStore) WriteToLevel(l *level, selector []string, ts int64, metric
 		b := l.metrics[metric.mc.offset]
 		if b == nil {
 			// First write to this metric and level
-			b = newBuffer(ts, metric.mc.Frequency)
+			b = newBuffer(ts, metric.mc.Frequency, metric.Unit)
 			l.metrics[metric.mc.offset] = b
 		}
 
@@ -433,14 +435,15 @@ func (m *MemoryStore) WriteToLevel(l *level, selector []string, ts int64, metric
 // If the level does not hold the metric itself, the data will be aggregated recursively from the children.
 // The second and third return value are the actual from/to for the data. Those can be different from
 // the range asked for if no data was available.
-func (m *MemoryStore) Read(selector Selector, metric string, from, to int64) ([]Float, int64, int64, error) {
+func (m *MemoryStore) Read(selector Selector, metric string, from, to int64) ([]Float, int64, int64, string, error) {
+	var unit string = ""
 	if from > to {
-		return nil, 0, 0, errors.New("invalid time range")
+		return nil, 0, 0, "", errors.New("invalid time range")
 	}
 
 	minfo, ok := m.metrics[metric]
 	if !ok {
-		return nil, 0, 0, errors.New("unkown metric: " + metric)
+		return nil, 0, 0, "", errors.New("unkown metric: " + metric)
 	}
 
 	n, data := 0, make([]Float, (to-from)/minfo.Frequency+1)
@@ -449,6 +452,7 @@ func (m *MemoryStore) Read(selector Selector, metric string, from, to int64) ([]
 		if err != nil {
 			return err
 		}
+		unit = b.unit
 
 		if n == 0 {
 			from, to = cfrom, cto
@@ -476,9 +480,9 @@ func (m *MemoryStore) Read(selector Selector, metric string, from, to int64) ([]
 	})
 
 	if err != nil {
-		return nil, 0, 0, err
+		return nil, 0, 0, "", err
 	} else if n == 0 {
-		return nil, 0, 0, errors.New("metric or host not found")
+		return nil, 0, 0, "", errors.New("metric or host not found")
 	} else if n > 1 {
 		if minfo.Aggregation == AvgAggregation {
 			normalize := 1. / Float(n)
@@ -486,11 +490,11 @@ func (m *MemoryStore) Read(selector Selector, metric string, from, to int64) ([]
 				data[i] *= normalize
 			}
 		} else if minfo.Aggregation != SumAggregation {
-			return nil, 0, 0, errors.New("invalid aggregation")
+			return nil, 0, 0, "", errors.New("invalid aggregation")
 		}
 	}
 
-	return data, from, to, nil
+	return data, from, to, unit, nil
 }
 
 // Release all buffers for the selected level and all its children that contain only

memstore_test.go

@@ -28,12 +28,12 @@ func TestMemoryStoreBasics(t *testing.T) {
 	}
 
 	sel := Selector{{String: "testhost"}}
-	adata, from, to, err := store.Read(sel, "a", start, start+count*frequency)
-	if err != nil || from != start || to != start+count*frequency {
+	adata, from, to, unit, err := store.Read(sel, "a", start, start+count*frequency)
+	if err != nil || from != start || to != start+count*frequency || unit != "" {
 		t.Error(err)
 		return
 	}
-	bdata, _, _, err := store.Read(sel, "b", start, start+count*frequency)
+	bdata, _, _, unit, err := store.Read(sel, "b", start, start+count*frequency)
 	if err != nil {
 		t.Error(err)
 		return
@@ -83,23 +83,23 @@ func TestMemoryStoreTooMuchWrites(t *testing.T) {
 	}
 
 	end := start + int64(count)*frequency
-	data, from, to, err := store.Read(Selector{{String: "test"}}, "a", start, end)
-	if len(data) != count || from != start || to != end || err != nil {
+	data, from, to, unit, err := store.Read(Selector{{String: "test"}}, "a", start, end)
+	if len(data) != count || from != start || to != end || err != nil || unit != "" {
 		t.Fatalf("a: err=%#v, from=%d, to=%d, data=%#v\n", err, from, to, data)
 	}
 
-	data, from, to, err = store.Read(Selector{{String: "test"}}, "b", start, end)
-	if len(data) != count/2 || from != start || to != end || err != nil {
+	data, from, to, unit, err = store.Read(Selector{{String: "test"}}, "b", start, end)
+	if len(data) != count/2 || from != start || to != end || err != nil || unit != "" {
 		t.Fatalf("b: err=%#v, from=%d, to=%d, data=%#v\n", err, from, to, data)
 	}
 
-	data, from, to, err = store.Read(Selector{{String: "test"}}, "c", start, end)
-	if len(data) != count*2-1 || from != start || to != end-frequency/2 || err != nil {
+	data, from, to, unit, err = store.Read(Selector{{String: "test"}}, "c", start, end)
+	if len(data) != count*2-1 || from != start || to != end-frequency/2 || err != nil || unit != "" {
 		t.Fatalf("c: err=%#v, from=%d, to=%d, data=%#v\n", err, from, to, data)
 	}
 
-	data, from, to, err = store.Read(Selector{{String: "test"}}, "d", start, end)
-	if len(data) != count/3+1 || from != start || to != end+frequency*2 || err != nil {
+	data, from, to, unit, err = store.Read(Selector{{String: "test"}}, "d", start, end)
+	if len(data) != count/3+1 || from != start || to != end+frequency*2 || err != nil || unit != "" {
 		t.Errorf("expected: err=nil, from=%d, to=%d, len(data)=%d\n", start, end+frequency*2, count/3)
 		t.Fatalf("d: err=%#v, from=%d, to=%d, data=%#v\n", err, from, to, data)
 	}
@@ -121,7 +121,7 @@ func TestMemoryStoreOutOfBounds(t *testing.T) {
 	}
 
 	sel := Selector{{String: "cluster"}, {String: "host"}, {String: "cpu"}}
-	data, from, to, err := store.Read(sel, "a", 500, int64(toffset+count*60+500))
+	data, from, to, unit, err := store.Read(sel, "a", 500, int64(toffset+count*60+500))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -136,14 +136,14 @@ func TestMemoryStoreOutOfBounds(t *testing.T) {
 	}
 
 	testfrom, testlen := int64(100000000), int64(10000)
-	data, from, to, err = store.Read(sel, "a", testfrom, testfrom+testlen)
-	if len(data) != 0 || from != testfrom || to != testfrom || err != nil {
+	data, from, to, unit, err = store.Read(sel, "a", testfrom, testfrom+testlen)
+	if len(data) != 0 || from != testfrom || to != testfrom || err != nil || unit != "" {
 		t.Fatal("Unexpected data returned when reading range after valid data")
 	}
 
 	testfrom, testlen = 0, 10
-	data, from, to, err = store.Read(sel, "a", testfrom, testfrom+testlen)
-	if len(data) != 0 || from/60 != int64(toffset)/60 || to/60 != int64(toffset)/60 || err != nil {
+	data, from, to, unit, err = store.Read(sel, "a", testfrom, testfrom+testlen)
+	if len(data) != 0 || from/60 != int64(toffset)/60 || to/60 != int64(toffset)/60 || err != nil || unit != "" {
 		t.Fatal("Unexpected data returned when reading range before valid data")
 	}
 }
@@ -169,7 +169,7 @@ func TestMemoryStoreMissingDatapoints(t *testing.T) {
 	}
 
 	sel := Selector{{String: "testhost"}}
-	adata, _, _, err := store.Read(sel, "a", 0, int64(count))
+	adata, _, _, _, err := store.Read(sel, "a", 0, int64(count))
 	if err != nil {
 		t.Error(err)
 		return
@@ -219,7 +219,7 @@ func TestMemoryStoreAggregation(t *testing.T) {
 		}
 	}
 
-	adata, from, to, err := store.Read(Selector{{String: "host0"}}, "a", int64(0), int64(count))
+	adata, from, to, _, err := store.Read(Selector{{String: "host0"}}, "a", int64(0), int64(count))
 	if err != nil {
 		t.Error(err)
 		return
@@ -352,7 +352,7 @@ func TestMemoryStoreArchive(t *testing.T) {
 	}
 
 	sel := Selector{{String: "cluster"}, {String: "host"}, {String: "cpu0"}}
-	adata, from, to, err := store2.Read(sel, "a", 100, int64(100+count))
+	adata, from, to, _, err := store2.Read(sel, "a", 100, int64(100+count))
 	if err != nil {
 		t.Error(err)
 		return
@@ -398,7 +398,7 @@ func TestMemoryStoreFree(t *testing.T) {
 		t.Fatal("two buffers expected to be released")
 	}
 
-	adata, from, to, err := store.Read(Selector{{String: "cluster"}, {String: "host"}, {String: "1"}}, "a", 0, int64(count))
+	adata, from, to, _, err := store.Read(Selector{{String: "cluster"}, {String: "host"}, {String: "1"}}, "a", 0, int64(count))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -451,7 +451,7 @@ func BenchmarkMemoryStoreConcurrentWrites(b *testing.B) {
 	for g := 0; g < goroutines; g++ {
 		host := fmt.Sprintf("host%d", g)
 		sel := Selector{{String: "cluster"}, {String: host}, {String: "cpu0"}}
-		adata, _, _, err := store.Read(sel, "a", 0, int64(count)*frequency)
+		adata, _, _, _, err := store.Read(sel, "a", 0, int64(count)*frequency)
 		if err != nil {
 			b.Error(err)
 			return
@@ -500,7 +500,7 @@ func BenchmarkMemoryStoreAggregation(b *testing.B) {
 
 	b.StartTimer()
 	for n := 0; n < b.N; n++ {
-		data, from, to, err := store.Read(Selector{{String: "testcluster"}, {String: "host123"}}, "flops_any", 0, int64(count))
+		data, from, to, _, err := store.Read(Selector{{String: "testcluster"}, {String: "host123"}}, "flops_any", 0, int64(count))
 		if err != nil {
 			b.Fatal(err)
 		}

testdata/checkpoints/fritz/f0131/1692628930.json

@@ -0,0 +1 @@
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