Support setting Raft heartbeat timeout

CHANGELOG.md

@@ -1,4 +1,5 @@
 ## 3.3.0 (unreleased)
+- [PR #151](https://github.com/rqlite/rqlite/pull/151): Support configurable Raft heartbeat timeout.
 - [PR #149](https://github.com/rqlite/rqlite/pull/149): Support configurable Raft snapshot thresholds.
 - [PR #148](https://github.com/rqlite/rqlite/pull/148): Support pprof information over HTTP.
 

cmd/rqlited/main.go

@@ -78,6 +78,7 @@ var dsn string
 var onDisk bool
 var noVerifySelect bool
 var raftSnapThreshold uint64
+var raftHeartbeatTimeout string
 var showVersion bool
 var cpuprofile string
 
@@ -99,6 +100,7 @@ func init() {
 	flag.BoolVar(&onDisk, "ondisk", false, "Use an on-disk SQLite database")
 	flag.BoolVar(&noVerifySelect, "nosel", false, "Don't verify that all queries begin with SELECT")
 	flag.BoolVar(&showVersion, "version", false, "Show version information and exit")
+	flag.StringVar(&raftHeartbeatTimeout, "rafttimeout", "1s", "Raft heartbeat timeout")
 	flag.Uint64Var(&raftSnapThreshold, "raftsnap", 8192, "Number of outstanding log entries to trigger snapshot")
 	flag.StringVar(&cpuprofile, "cpuprofile", "", "Write CPU profile to file")
 	flag.Usage = func() {
@@ -189,6 +191,10 @@ func main() {
 		log.Fatalf("failed to open store: %s", err.Error())
 	}
 	store.SnapshotThreshold = raftSnapThreshold
+	store.HeartbeatTimeout, err = time.ParseDuration(raftHeartbeatTimeout)
+	if err != nil {
+		log.Fatalf("failed to parse Raft heartbeat timeout %s: %s", raftHeartbeatTimeout, err.Error())
+	}
 
 	// Create and configure cluster service.
 	tn := mux.Listen(muxMetaHeader)

store/store.go

@@ -165,6 +165,7 @@ type Store struct {
 	logger *log.Logger
 
 	SnapshotThreshold uint64
+	HeartbeatTimeout  time.Duration
 }
 
 // New returns a new Store.
@@ -213,6 +214,9 @@ func (s *Store) Open(enableSingle bool) error {
 	if s.SnapshotThreshold != 0 {
 		config.SnapshotThreshold = s.SnapshotThreshold
 	}
+	if s.HeartbeatTimeout != 0 {
+		config.HeartbeatTimeout = s.HeartbeatTimeout
+	}
 
 	// Check for any existing peers.
 	peers, err := readPeersJSON(filepath.Join(s.raftDir, "peers.json"))