TaiJuWu commented on code in PR #18998:
URL: https://github.com/apache/kafka/pull/18998#discussion_r1988917953


##########
raft/src/main/java/org/apache/kafka/raft/QuorumConfig.java:
##########
@@ -102,12 +103,12 @@ public class QuorumConfig {
     public static final ConfigDef CONFIG_DEF =  new ConfigDef()
             .define(QUORUM_VOTERS_CONFIG, LIST, DEFAULT_QUORUM_VOTERS, new 
ControllerQuorumVotersValidator(), HIGH, QUORUM_VOTERS_DOC)
             .define(QUORUM_BOOTSTRAP_SERVERS_CONFIG, LIST, 
DEFAULT_QUORUM_BOOTSTRAP_SERVERS, new 
ControllerQuorumBootstrapServersValidator(), HIGH, QUORUM_BOOTSTRAP_SERVERS_DOC)
-            .define(QUORUM_ELECTION_TIMEOUT_MS_CONFIG, INT, 
DEFAULT_QUORUM_ELECTION_TIMEOUT_MS, null, HIGH, QUORUM_ELECTION_TIMEOUT_MS_DOC)
-            .define(QUORUM_FETCH_TIMEOUT_MS_CONFIG, INT, 
DEFAULT_QUORUM_FETCH_TIMEOUT_MS, null, HIGH, QUORUM_FETCH_TIMEOUT_MS_DOC)
-            .define(QUORUM_ELECTION_BACKOFF_MAX_MS_CONFIG, INT, 
DEFAULT_QUORUM_ELECTION_BACKOFF_MAX_MS, null, HIGH, 
QUORUM_ELECTION_BACKOFF_MAX_MS_DOC)
-            .define(QUORUM_LINGER_MS_CONFIG, INT, DEFAULT_QUORUM_LINGER_MS, 
null, MEDIUM, QUORUM_LINGER_MS_DOC)
-            .define(QUORUM_REQUEST_TIMEOUT_MS_CONFIG, INT, 
DEFAULT_QUORUM_REQUEST_TIMEOUT_MS, null, MEDIUM, QUORUM_REQUEST_TIMEOUT_MS_DOC)
-            .define(QUORUM_RETRY_BACKOFF_MS_CONFIG, INT, 
DEFAULT_QUORUM_RETRY_BACKOFF_MS, null, LOW, QUORUM_RETRY_BACKOFF_MS_DOC);
+            .define(QUORUM_ELECTION_TIMEOUT_MS_CONFIG, INT, 
DEFAULT_QUORUM_ELECTION_TIMEOUT_MS, atLeast(1), HIGH, 
QUORUM_ELECTION_TIMEOUT_MS_DOC)
+            .define(QUORUM_FETCH_TIMEOUT_MS_CONFIG, INT, 
DEFAULT_QUORUM_FETCH_TIMEOUT_MS, atLeast(1), HIGH, QUORUM_FETCH_TIMEOUT_MS_DOC)
+            .define(QUORUM_ELECTION_BACKOFF_MAX_MS_CONFIG, INT, 
DEFAULT_QUORUM_ELECTION_BACKOFF_MAX_MS, atLeast(1), HIGH, 
QUORUM_ELECTION_BACKOFF_MAX_MS_DOC)

Review Comment:
   You are right, we should not change the limitation without any KIP so I just 
set all lower bound to 0, thanks for your feedback.



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