guozhangwang commented on a change in pull request #11631:
URL: https://github.com/apache/kafka/pull/11631#discussion_r800245635



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinator.java
##########
@@ -488,7 +492,7 @@ public boolean poll(Timer timer, boolean waitForJoinGroup) {
             // Always update the heartbeat last poll time so that the 
heartbeat thread does not leave the
             // group proactively due to application inactivity even if (say) 
the coordinator cannot be found.
             pollHeartbeat(timer.currentTimeMs());
-            if (coordinatorUnknown() && !ensureCoordinatorReady(timer)) {
+            if (coordinatorUnknownAndUnready(timer)) {

Review comment:
       Makes sense.

##########
File path: 
clients/src/test/java/org/apache/kafka/clients/consumer/KafkaConsumerTest.java
##########
@@ -2641,14 +2565,16 @@ private FetchResponse fetchResponse(TopicPartition 
partition, long fetchOffset,
         ConsumerNetworkClient consumerClient = new 
ConsumerNetworkClient(loggerFactory, client, metadata, time,
                 retryBackoffMs, requestTimeoutMs, heartbeatIntervalMs);
 
-        GroupRebalanceConfig rebalanceConfig = new 
GroupRebalanceConfig(sessionTimeoutMs,
+        ConsumerCoordinator consumerCoordinator = null;
+        if (groupId != null) {
+            GroupRebalanceConfig rebalanceConfig = new 
GroupRebalanceConfig(sessionTimeoutMs,

Review comment:
       Nice cleanup!




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