[GitHub] [incubator-hudi] pratyakshsharma commented on a change in pull request #1562: [HUDI-837]: implemented custom deserializer for AvroKafkaSource

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pratyakshsharma commented on a change in pull request #1562:
URL: https://github.com/apache/incubator-hudi/pull/1562#discussion_r416527261



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File path: hudi-utilities/src/main/java/org/apache/hudi/utilities/sources/serde/HoodieAvroKafkaDeserializer.java
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@@ -0,0 +1,78 @@
+/*
+ * 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.hudi.utilities.sources.serde;
+
+import org.apache.hudi.common.config.TypedProperties;
+import org.apache.hudi.utilities.UtilHelpers;
+import org.apache.hudi.utilities.schema.SchemaProvider;
+
+import io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer;
+import io.confluent.kafka.serializers.KafkaAvroDeserializerConfig;
+import kafka.serializer.Decoder;
+import kafka.utils.VerifiableProperties;
+import org.apache.avro.Schema;
+import org.apache.kafka.common.errors.SerializationException;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Properties;
+
+/**
+ * This is a custom implementation of kafka.serializer.Decoder<T> which aims at deserializing all the incoming messages
+ * with same schema (which is latest).
+ */
+public class HoodieAvroKafkaDeserializer extends AbstractKafkaAvroDeserializer implements Decoder<Object> {
+
+  private final Schema sourceSchema;
+  private static final String SCHEMA_PROVIDER_CLASS_PROP = "hoodie.deltastreamer.schemaprovider.class";
+
+  public HoodieAvroKafkaDeserializer(VerifiableProperties properties) {
+    this.configure(new KafkaAvroDeserializerConfig(properties.props()));
+    TypedProperties typedProperties = new TypedProperties();
+    copyProperties(typedProperties, properties.props());
+    try {
+      SchemaProvider schemaProvider = UtilHelpers.createSchemaProvider(

Review comment:
       As per my understanding, Deserializer comes into picture after offsets have been determined since it will be called internally by kafka. So whatever sourceSchema we get at this point of time, that is going to be the latest for the incoming batch. Please correct me if I am missing something here. 




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