jeffkbkim commented on code in PR #12783:
URL: https://github.com/apache/kafka/pull/12783#discussion_r1008321714


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core/src/test/scala/integration/kafka/server/FetchFromFollowerIntegrationTest.scala:
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@@ -0,0 +1,110 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package integration.kafka.server
+
+import kafka.server.{BaseFetchRequestTest, KafkaConfig}
+import kafka.utils.{TestInfoUtils, TestUtils}
+import org.apache.kafka.clients.admin.Admin
+import org.apache.kafka.common.TopicPartition
+import org.apache.kafka.common.protocol.{ApiKeys, Errors}
+import org.apache.kafka.common.requests.FetchResponse
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.{AfterEach, BeforeEach, Timeout}
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.ValueSource
+
+import java.util.Properties
+import scala.jdk.CollectionConverters._
+
+class FetchFromFollowerIntegrationTest extends BaseFetchRequestTest {
+  val numNodes = 2

Review Comment:
   as mentioned in the other thread, the purgatory is being completed on both 
replication and HWM update. have confirmed that the current setup always 
completes the purgatory once after appending new records and before HWM 
propagation because the replica fetcher thread does them sequentially.



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