jsancio commented on code in PR #18304:
URL: https://github.com/apache/kafka/pull/18304#discussion_r1929185438


##########
raft/src/main/java/org/apache/kafka/raft/internals/KRaftControlRecordStateMachine.java:
##########
@@ -130,7 +132,7 @@ public void truncateNewEntries(long endOffset) {
         }
 
         kafkaRaftMetrics.updateNumVoters(voterSetHistory.lastValue().size());
-        if (staticVoterSet.isPresent() && 
voterSetHistory.lastEntry().isEmpty()) {
+        if (staticVoterSet.size() > 0 && 
voterSetHistory.lastEntry().isEmpty()) {

Review Comment:
   Use `!staticVoterSet.isEmpty()`. Sometimes `size()` is not constant time.



##########
raft/src/main/java/org/apache/kafka/raft/internals/KRaftControlRecordStateMachine.java:
##########
@@ -298,7 +300,7 @@ private void handleBatch(Batch<?> batch, OptionalLong 
overrideOffset) {
                 case KRAFT_VOTERS:
                     VoterSet voters = VoterSet.fromVotersRecord((VotersRecord) 
record.message());
                     kafkaRaftMetrics.updateNumVoters(voters.size());
-                    if (staticVoterSet.isPresent()) {
+                    if (staticVoterSet.size() > 0) {

Review Comment:
   Use `!staticVoterSet.isEmpty()`. Sometimes `size()` is not constant time.



##########
raft/src/main/java/org/apache/kafka/raft/internals/KRaftControlRecordStateMachine.java:
##########
@@ -103,9 +103,11 @@ public KRaftControlRecordStateMachine(
         this.logger = logContext.logger(this.getClass());
         this.kafkaRaftMetrics = kafkaRaftMetrics;
         this.externalKRaftMetrics = externalKRaftMetrics;
-        this.staticVoterSet = staticVoterSet.size() > 0 ? 
Optional.of(staticVoterSet) : Optional.empty();
+        this.staticVoterSet = staticVoterSet;
 
-        this.staticVoterSet.ifPresent(voters -> 
kafkaRaftMetrics.updateNumVoters(voters.size()));
+        if (staticVoterSet.size() > 0) {
+            kafkaRaftMetrics.updateNumVoters(staticVoterSet.size());
+        }

Review Comment:
   ```java
           kafkaRaftMetrics.updateNumVoters(staticVoterSet.size());
   ```
   Do you need the conditional?



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