ahuang98 commented on code in PR #18240:
URL: https://github.com/apache/kafka/pull/18240#discussion_r1918935598
##########
raft/src/main/java/org/apache/kafka/raft/QuorumState.java:
##########
@@ -562,6 +656,25 @@ public void transitionToCandidate() {
));
}
+ private void checkValidTransitionToCandidate() {
+ if (isObserver()) {
+ throw new IllegalStateException(
+ String.format(
+ "Cannot transition to Candidate since the local id (%s)
and directory id (%s) " +
+ "is not one of the voters %s",
+ localId,
+ localDirectoryId,
+ partitionState.lastVoterSet()
+ )
+ );
+ }
+ // Only Prospective is allowed to transition to Candidate
+ if (!isProspective()) {
+ throw new IllegalStateException("Cannot transition to Candidate
since the local broker.id=" + localId +
+ " is state " + state);
Review Comment:
I'll convert
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