C0urante commented on a change in pull request #10014:
URL: https://github.com/apache/kafka/pull/10014#discussion_r590550843



##########
File path: 
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java
##########
@@ -402,7 +402,7 @@ public void tick() {
             log.debug("Scheduled rebalance at: {} (now: {} 
nextRequestTimeoutMs: {}) ",
                     scheduledRebalance, now, nextRequestTimeoutMs);
         }
-        if (internalRequestValidationEnabled() && keyExpiration < 
Long.MAX_VALUE) {
+        if (isLeader() && internalRequestValidationEnabled() && keyExpiration 
< Long.MAX_VALUE) {

Review comment:
       Good question--this shouldn't be possible since 
`KafkaConfigBackingStore::putSessionKey` does a flush and read-to-end after 
dispatching the new session key to the producer:
   
   
https://github.com/apache/kafka/blob/0e8a84e5d7203765240894873fd2896906dfbc2b/connect/runtime/src/main/java/org/apache/kafka/connect/storage/KafkaConfigBackingStore.java#L456-L471




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