stevenzwu commented on a change in pull request #15924:
URL: https://github.com/apache/flink/pull/15924#discussion_r641286065



##########
File path: 
flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/source/hybrid/HybridSourceEnumeratorStateSerializer.java
##########
@@ -0,0 +1,90 @@
+/*
+ * 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.flink.connector.base.source.hybrid;
+
+import org.apache.flink.core.io.SimpleVersionedSerializer;
+import org.apache.flink.util.Preconditions;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.List;
+
+/** The {@link SimpleVersionedSerializer Serializer} for the enumerator state. 
*/
+public class HybridSourceEnumeratorStateSerializer
+        implements SimpleVersionedSerializer<HybridSourceEnumeratorState> {
+
+    private static final int CURRENT_VERSION = 0;
+
+    final List<SimpleVersionedSerializer<Object>> serializers;
+
+    public HybridSourceEnumeratorStateSerializer(
+            List<SimpleVersionedSerializer<Object>> serializers) {
+        this.serializers = serializers;
+    }
+
+    @Override
+    public int getVersion() {
+        return CURRENT_VERSION;
+    }
+
+    @Override
+    public byte[] serialize(HybridSourceEnumeratorState enumState) throws 
IOException {
+        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
+                DataOutputStream out = new DataOutputStream(baos)) {
+            out.writeInt(enumState.getCurrentSourceIndex());
+            SimpleVersionedSerializer<Object> serializer =
+                    serializerOf(enumState.getCurrentSourceIndex());
+            out.writeInt(serializer.getVersion());
+            byte[] enumStateBytes = 
serializer.serialize(enumState.getWrappedState());
+            out.writeInt(enumStateBytes.length);
+            out.write(enumStateBytes);
+            return baos.toByteArray();
+        }
+    }
+
+    @Override
+    public HybridSourceEnumeratorState deserialize(int version, byte[] 
serialized)

Review comment:
       nit: maybe replicate the pattern in HybridSourceSplitSerializer?




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