Off by one error in election time out.

This was caught in TestCandidateStartNewElection2AA, 1/20 th chance of
hitting it.

Author: Junlong Gao

Dockerfile

@@ -0,0 +1,4 @@
+FROM golang:1.13.8
+
+COPY . /src
+ENTRYPOINT ["/src/entrypoint.sh"]

entrypoint.sh

@@ -1,10 +1,12 @@
 #!/bin/bash -ex
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}"  )" >/dev/null 2>&1 && pwd  )"
 cd $DIR
-
+iter=0
+export GO111MODULE=on
+go mod tidy
 while true; do
-    export GO111MODULE=on
-    go mod tidy
+    iter=$((iter+1))
+    echo "iteration $iter"
     make project1
     make project2a
     make project2b

log/log.go

@@ -56,8 +56,8 @@ var _log *Logger = New()
 func init() {
 	SetFlags(Ldate | Ltime | Lshortfile)
 	SetHighlighting(runtime.GOOS != "windows")
-	SetLevel(LOG_LEVEL_NONE)
-	_log._log.SetOutput(os.Stderr)
+	SetLevel(LOG_LEVEL_INFO)
+	_log._log.SetOutput(os.Stdout)
 }
 
 func GlobalLogger() *log.Logger {

raft/raft.go

@@ -419,7 +419,7 @@ func (r *Raft) becomeFollower(term uint64, lead uint64) {
 	r.votes = make(map[uint64]bool)
 
 	r.electionElapsed = 0
-	r.electionTimeout = r.electionTimeoutConfig + rand.Int()%(r.electionTimeoutConfig+1)
+	r.electionTimeout = r.electionTimeoutConfig + rand.Int()%r.electionTimeoutConfig
 }
 
 // becomeCandidate transform this peer's state to candidate
@@ -432,7 +432,7 @@ func (r *Raft) becomeCandidate() {
 
 	r.Term++
 	r.State = StateCandidate
-	r.electionTimeout = r.electionTimeoutConfig + rand.Int()%(r.electionTimeoutConfig+1)
+	r.electionTimeout = r.electionTimeoutConfig + rand.Int()%r.electionTimeoutConfig
 	r.Lead = None
 
 }