Fix term signal.

This commit changes raft so that term changes are made immediately and
term change signals are made afterward. Previously, election timeouts
were invalidated by incoming term changes which caused an election loop.

Stale term was also fixed and http/pprof was added too.

cmd/influxd/config.go

@@ -184,6 +184,10 @@ type Config struct {
 		WriteInterval Duration `toml:"write-interval"`
 	} `toml:"monitoring"`
 
+	Debugging struct {
+		PprofEnabled bool `toml:"pprof-enabled"`
+	} `toml:"debugging"`
+
 	ContinuousQuery struct {
 		// when continuous queries are run we'll automatically recompute previous intervals
 		// in case lagged data came in. Set to zero if you never have lagged data. We do

cmd/influxd/handler.go

@@ -4,6 +4,7 @@ import (
 	"log"
 	"math/rand"
 	"net/http"
+	"net/http/pprof"
 	"net/url"
 	"strings"
 
@@ -29,6 +30,21 @@ func NewHandler() *Handler {
 
 // ServeHTTP responds to HTTP request to the handler.
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Debug routes.
+	if strings.HasPrefix(r.URL.Path, "/debug/pprof") {
+		switch r.URL.Path {
+		case "/debug/pprof/cmdline":
+			pprof.Cmdline(w, r)
+		case "/debug/pprof/profile":
+			pprof.Profile(w, r)
+		case "/debug/pprof/symbol":
+			pprof.Symbol(w, r)
+		default:
+			pprof.Index(w, r)
+		}
+		return
+	}
+
 	// FIXME: This is very brittle.  Refactor to have common path prefix
 	if strings.HasPrefix(r.URL.Path, "/raft") {
 		h.serveRaft(w, r)

messaging/broker.go

@@ -495,12 +495,9 @@ func (b *Broker) applySetTopicMaxIndex(m *Message) {
 	if t := b.topics[topicID]; t != nil {
 		t.mu.Lock()
 		defer t.mu.Unlock()
+
 		// Track the highest replicated index per data node URL
 		t.indexByURL[u] = index
-
-		if t.index < index {
-			t.index = index
-		}
 	}
 }
 
@@ -815,6 +812,9 @@ func (t *Topic) WriteMessage(m *Message) error {
 		return fmt.Errorf("write segment: %s", err)
 	}
 
+	// Update index.
+	t.index = m.Index
+
 	return nil
 }
 

raft/log.go

@@ -546,6 +546,12 @@ func (l *Log) mustSetTermIfHigher(term uint64) {
 	if err := l.setTerm(term); err != nil {
 		panic("unable to set term: " + err.Error())
 	}
+
+	// Signal term change.
+	select {
+	case l.terms <- struct{}{}:
+	default:
+	}
 }
 
 // readConfig reads the configuration from disk.

server.go

@@ -1771,6 +1771,7 @@ func (s *Server) WriteSeries(database, retentionPolicy string, points []Point) (
 		for _, p := range points {
 			measurement, series := db.MeasurementAndSeries(p.Name, p.Tags)
 			if series == nil {
+				s.Logger.Printf("series not found: name=%s, tags=%#v", p.Name, p.Tags)
 				return ErrSeriesNotFound
 			}