mannoopj commented on code in PR #20707:
URL: https://github.com/apache/kafka/pull/20707#discussion_r2505142083


##########
metadata/src/main/java/org/apache/kafka/controller/QuorumController.java:
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@@ -384,8 +384,6 @@ public Builder setUncleanLeaderElectionCheckIntervalMs(long 
uncleanLeaderElectio
         public QuorumController build() throws Exception {
             if (raftClient == null) {
                 throw new IllegalStateException("You must set a raft client.");
-            } else if (bootstrapMetadata == null) {
-                throw new IllegalStateException("You must specify an initial 
metadata.version using the kafka-storage tool.");

Review Comment:
   The idea here is that for when we try to read `bootstrap.checkpoint` from 
`KafkaRaftServer`, in the scenarios where this file doesn't exist we would send 
a null value. Currently BootstrapDirectory.read() defaults to a non null value. 
I was thinking we change this to null as a way of determining if the 
bootstrap.checkpoint exists for WARN messages. Unless we do want to keep the 
behavior of defaulting to non null records?



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