TaiJuWu commented on code in PR #19914:
URL: https://github.com/apache/kafka/pull/19914#discussion_r2203680551


##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/consumer/PlaintextConsumerCommitTest.java:
##########
@@ -452,6 +452,37 @@ private void testPositionAndCommit(GroupProtocol 
groupProtocol) throws Interrupt
         }
     }
 
+    /**
+     * This is testing when closing the consumer but commit request has 
already been sent.
+     * During the closing, the consumer won't find the coordinator anymore.
+     */
+    @ClusterTest
+    public void testCommitAsyncFailsWhenCoordinatorUnavailableDuringClose() 
throws InterruptedException {
+        try (Producer<byte[], byte[]> producer = 
cluster.producer(Map.of(ProducerConfig.ACKS_CONFIG, "all"));
+             var consumer = createConsumer(GroupProtocol.CONSUMER, false)
+        ) {
+            sendRecords(producer, tp, 3, System.currentTimeMillis());
+            sendRecords(producer, tp1, 3, System.currentTimeMillis());

Review Comment:
   Do we need to two partition to check the coordinator is not found?
   Or just one is enough?



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