ijuma commented on a change in pull request #10393:
URL: https://github.com/apache/kafka/pull/10393#discussion_r607233215



##########
File path: raft/src/main/java/org/apache/kafka/raft/CandidateState.java
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@@ -235,6 +240,15 @@ public int epoch() {
         return highWatermark;
     }
 
+    @Override
+    public boolean canGrantVote(int candidateId, boolean isLogUpToDate) {
+        // Still reject vote request even candidateId = localId, Although the 
candidate votes for
+        // itself, this vote is implicit and not "granted".
+        log.debug("Rejecting vote request from candidate {} since we are 
already candidate in epoch {}",
+            candidateId, epoch);

Review comment:
       As a general rule, methods like this should not log IMO. The calling 
method should log instead. That is, good to avoid the side effect from the 
"check" operation. It seems like it was like that before this PR. What was the 
motivation for changing it?




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