From 3820f2fe179995aa6aa12e1fd2ab9b07a7938620 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Thu, 26 Mar 2026 23:25:13 +0200
Subject: Fix Raft jitter deadline election guard
 (0bac83d3-1322-4940-a9ee-58eb1e0d6245)

---
 src/main/java/protocols/implementations/VSRaftProtocol.java | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'src/main/java/protocols/implementations/VSRaftProtocol.java')

diff --git a/src/main/java/protocols/implementations/VSRaftProtocol.java b/src/main/java/protocols/implementations/VSRaftProtocol.java
index eaf63a7..6257538 100644
--- a/src/main/java/protocols/implementations/VSRaftProtocol.java
+++ b/src/main/java/protocols/implementations/VSRaftProtocol.java
@@ -33,6 +33,9 @@ public class VSRaftProtocol extends VSAbstractProtocol {
     /** The local time when the last heartbeat was observed. */
     private long lastHeartbeatTime;
 
+    /** The randomized local deadline for the next election timeout. */
+    private long electionDeadline;
+
     /** PIDs which still have to acknowledge the current operation. */
     private ArrayList<Integer> ackPids;
 
@@ -105,9 +108,9 @@ public class VSRaftProtocol extends VSAbstractProtocol {
      * @see protocols.VSAbstractProtocol#onClientSchedule()
      */
     public void onClientSchedule() {
-        long elapsedSinceHeartbeat = process.getTime() - lastHeartbeatTime;
+        long currentTime = process.getTime();
 
-        if (!isLeader && elapsedSinceHeartbeat >= getLong("electionTimeout")) {
+        if (!isLeader && currentTime >= electionDeadline) {
             startElection();
         }
     }
@@ -137,6 +140,7 @@ public class VSRaftProtocol extends VSAbstractProtocol {
         isLeader = false;
         isCandidate = false;
         lastHeartbeatTime = 0;
+        electionDeadline = 0;
         logIndex = 0;
         commitIndex = 0;
 
@@ -183,10 +187,11 @@ public class VSRaftProtocol extends VSAbstractProtocol {
         long jitterPercentage = Math.abs(process.getRandomPercentage());
         long jitter = (getLong("electionJitter") * jitterPercentage) / 100L;
         boolean previousContextIsServer = currentContextIsServer();
+        electionDeadline = process.getTime() + getLong("electionTimeout") + jitter;
 
         currentContextIsServer(false);
         removeSchedules();
-        scheduleAt(process.getTime() + getLong("electionTimeout") + jitter);
+        scheduleAt(electionDeadline);
         currentContextIsServer(previousContextIsServer);
     }
 
-- 
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