frankvicky commented on code in PR #20083:
URL: https://github.com/apache/kafka/pull/20083#discussion_r2184219281


##########
storage/src/main/java/org/apache/kafka/storage/internals/log/PendingExpandIsr.java:
##########
@@ -0,0 +1,63 @@
+/*
+ * 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 org.apache.kafka.storage.internals.log;
+
+import org.apache.kafka.metadata.LeaderAndIsr;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public record PendingExpandIsr(int newInSyncReplicaId,
+                               LeaderAndIsr sentLeaderAndIsr,
+                               CommittedPartitionState lastCommittedState) 
implements PendingPartitionChange {
+
+    @Override
+    public CommittedPartitionState lastCommittedState() {
+        return lastCommittedState;
+    }

Review Comment:
   Do we need this implementation?
   IIUC, `record` has already provided the exact same implementation behind the 
scenes.



##########
storage/src/main/java/org/apache/kafka/storage/internals/log/PendingShrinkIsr.java:
##########
@@ -0,0 +1,61 @@
+/*
+ * 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 org.apache.kafka.storage.internals.log;
+
+import org.apache.kafka.metadata.LeaderAndIsr;
+
+import java.util.Set;
+
+public record PendingShrinkIsr(Set<Integer> outOfSyncReplicaIds,
+                               LeaderAndIsr sentLeaderAndIsr,
+                               CommittedPartitionState lastCommittedState) 
implements PendingPartitionChange {
+
+
+    @Override
+    public CommittedPartitionState lastCommittedState() {
+        return lastCommittedState;
+    }

Review Comment:
   ditto



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