add tool to see which metrics are out of order

cmd/mt-kafka-mdm-sniff-out-of-order/main.go

@@ -0,0 +1,131 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"math/rand"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"text/template"
+	"time"
+
+	inKafkaMdm "github.com/raintank/metrictank/input/kafkamdm"
+	"github.com/raintank/metrictank/stats"
+	"github.com/raintank/worldping-api/pkg/log"
+	"github.com/rakyll/globalconf"
+	"gopkg.in/raintank/schema.v1"
+)
+
+var (
+	confFile = flag.String("config", "/etc/metrictank/metrictank.ini", "configuration file path")
+	format   = flag.String("format", "{{.First.Seen}} {{.First.Time}} | {{.Seen}} {{.Time}} {{.Part}} {{.OrgId}} {{.Id}} {{.Name}} {{.Metric}} {{.Interval}} {{.Value}} {{.Unit}} {{.Mtype}} {{.Tags}}", "template to render the data with")
+	prefix   = flag.String("prefix", "", "only show metrics that have this prefix")
+	substr   = flag.String("substr", "", "only show metrics that have this substring")
+)
+
+type Data struct {
+	Part int32
+	Seen time.Time
+	schema.MetricData
+}
+
+type TplData struct {
+	Data       // currently seen
+	First Data // seen the first time
+}
+
+// find out of order metrics
+type inputOOOFinder struct {
+	template.Template
+	data map[string]Data // by metric name
+	lock sync.Mutex
+}
+
+func newInputOOOFinder(format string) *inputOOOFinder {
+	tpl := template.Must(template.New("format").Parse(format + "\n"))
+	return &inputOOOFinder{
+		*tpl,
+		make(map[string]Data),
+		sync.Mutex{},
+	}
+}
+
+func (ip *inputOOOFinder) Process(metric *schema.MetricData, partition int32) {
+	if *prefix != "" && !strings.HasPrefix(metric.Metric, *prefix) {
+		return
+	}
+	if *substr != "" && !strings.Contains(metric.Metric, *substr) {
+		return
+	}
+	now := Data{
+		Part:       partition,
+		Seen:       time.Now(),
+		MetricData: *metric,
+	}
+	ip.lock.Lock()
+	first, ok := ip.data[metric.Name]
+	if !ok {
+		ip.data[metric.Name] = now
+	} else {
+		if metric.Time > first.Time {
+			ip.data[metric.Name] = now
+		} else {
+			t := TplData{now, first}
+			err := ip.Execute(os.Stdout, t)
+			if err != nil {
+				log.Error(0, "executing template: %s", err)
+			}
+		}
+	}
+	ip.lock.Unlock()
+}
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintln(os.Stderr, "mt-kafka-mdm-sniff-out-of-order")
+		fmt.Fprintln(os.Stderr)
+		fmt.Fprintln(os.Stderr, "Inspects what's flowing through kafka (in mdm format) and reports it to you")
+		fmt.Fprintf(os.Stderr, "\nFlags:\n\n")
+		flag.PrintDefaults()
+	}
+	flag.Parse()
+	log.NewLogger(0, "console", fmt.Sprintf(`{"level": %d, "formatting":false}`, 2))
+	instance := "mt-kafka-mdm-sniff-out-of-order" + strconv.Itoa(rand.Int())
+
+	// Only try and parse the conf file if it exists
+	path := ""
+	if _, err := os.Stat(*confFile); err == nil {
+		path = *confFile
+	}
+	conf, err := globalconf.NewWithOptions(&globalconf.Options{
+		Filename:  path,
+		EnvPrefix: "MT_",
+	})
+	if err != nil {
+		log.Fatal(4, "error with configuration file: %s", err)
+		os.Exit(1)
+	}
+	inKafkaMdm.ConfigSetup()
+	conf.ParseAll()
+
+	// config may have had it disabled
+	inKafkaMdm.Enabled = true
+	// important: we don't want to share the same offset tracker as the mdm input of MT itself
+	inKafkaMdm.DataDir = "/tmp/" + instance
+
+	inKafkaMdm.ConfigProcess(instance)
+
+	stats.NewDevnull() // make sure metrics don't pile up without getting discarded
+
+	mdm := inKafkaMdm.New()
+	mdm.Start(newInputOOOFinder(*format))
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+	<-sigChan
+	log.Info("stopping")
+	mdm.Stop()
+}

docs/tools.md

@@ -210,6 +210,26 @@ Flags:
 ```
 
 
+## mt-kafka-mdm-sniff-out-of-order
+
+```
+mt-kafka-mdm-sniff-out-of-order
+
+Inspects what's flowing through kafka (in mdm format) and reports it to you
+
+Flags:
+
+  -config string
+    	configuration file path (default "/etc/metrictank/metrictank.ini")
+  -format string
+    	template to render the data with (default "{{.First.Seen}} {{.First.Time}} | {{.Seen}} {{.Time}} {{.Part}} {{.OrgId}} {{.Id}} {{.Name}} {{.Metric}} {{.Interval}} {{.Value}} {{.Unit}} {{.Mtype}} {{.Tags}}")
+  -prefix string
+    	only show metrics that have this prefix
+  -substr string
+    	only show metrics that have this substring
+```
+
+
 ## mt-replicator
 
 ```