[FLINK-36082][pipeline-connector][kafka] fix NotSerializableException for KafkaDataSink.

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-kafka/src/main/java/org/apache/flink/cdc/connectors/kafka/sink/KafkaDataSink.java

@@ -19,9 +19,6 @@
 
 import org.apache.flink.api.common.serialization.SerializationSchema;
 import org.apache.flink.cdc.common.event.Event;
-import org.apache.flink.cdc.common.event.SchemaChangeEvent;
-import org.apache.flink.cdc.common.event.SchemaChangeEventType;
-import org.apache.flink.cdc.common.event.SchemaChangeEventTypeFamily;
 import org.apache.flink.cdc.common.sink.DataSink;
 import org.apache.flink.cdc.common.sink.EventSinkProvider;
 import org.apache.flink.cdc.common.sink.FlinkSinkProvider;
@@ -33,10 +30,7 @@
 import org.apache.kafka.clients.producer.ProducerConfig;
 
 import java.time.ZoneId;
-import java.util.Arrays;
 import java.util.Properties;
-import java.util.Set;
-import java.util.stream.Collectors;
 
 /** A {@link DataSink} for "Kafka" connector. */
 public class KafkaDataSink implements DataSink {
@@ -104,33 +98,6 @@ public EventSinkProvider getEventSinkProvider() {
 
     @Override
     public MetadataApplier getMetadataApplier() {
-        return new MetadataApplier() {
-
-            private Set<SchemaChangeEventType> enabledEventTypes =
-                    Arrays.stream(SchemaChangeEventTypeFamily.ALL).collect(Collectors.toSet());
-
-            @Override
-            public MetadataApplier setAcceptedSchemaEvolutionTypes(
-                    Set<SchemaChangeEventType> schemaEvolutionTypes) {
-                enabledEventTypes = schemaEvolutionTypes;
-                return this;
-            }
-
-            @Override
-            public boolean acceptsSchemaEvolutionType(SchemaChangeEventType schemaChangeEventType) {
-                return enabledEventTypes.contains(schemaChangeEventType);
-            }
-
-            @Override
-            public Set<SchemaChangeEventType> getSupportedSchemaEvolutionTypes() {
-                // All schema change events are supported.
-                return Arrays.stream(SchemaChangeEventTypeFamily.ALL).collect(Collectors.toSet());
-            }
-
-            @Override
-            public void applySchemaChange(SchemaChangeEvent schemaChangeEvent) {
-                // simply do nothing here because Kafka do not maintain the schemas.
-            }
-        };
+        return new KafkaMetaDataApplier();
     }
 }

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-kafka/src/main/java/org/apache/flink/cdc/connectors/kafka/sink/KafkaMetaDataApplier.java

@@ -0,0 +1,57 @@
+/*
+ * 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.cdc.connectors.kafka.sink;
+
+import org.apache.flink.cdc.common.event.SchemaChangeEvent;
+import org.apache.flink.cdc.common.event.SchemaChangeEventType;
+import org.apache.flink.cdc.common.event.SchemaChangeEventTypeFamily;
+import org.apache.flink.cdc.common.sink.MetadataApplier;
+
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/** Supports {@link KafkaDataSink} to schema evolution. */
+public class KafkaMetaDataApplier implements MetadataApplier {
+
+    private Set<SchemaChangeEventType> enabledEventTypes =
+            Arrays.stream(SchemaChangeEventTypeFamily.ALL).collect(Collectors.toSet());
+
+    @Override
+    public MetadataApplier setAcceptedSchemaEvolutionTypes(
+            Set<SchemaChangeEventType> schemaEvolutionTypes) {
+        enabledEventTypes = schemaEvolutionTypes;
+        return this;
+    }
+
+    @Override
+    public boolean acceptsSchemaEvolutionType(SchemaChangeEventType schemaChangeEventType) {
+        return enabledEventTypes.contains(schemaChangeEventType);
+    }
+
+    @Override
+    public Set<SchemaChangeEventType> getSupportedSchemaEvolutionTypes() {
+        // All schema change events are supported.
+        return Arrays.stream(SchemaChangeEventTypeFamily.ALL).collect(Collectors.toSet());
+    }
+
+    @Override
+    public void applySchemaChange(SchemaChangeEvent schemaChangeEvent) {
+        // simply do nothing here because Kafka do not maintain the schemas.
+    }
+}