[GitHub] [hudi] yanghua commented on a change in pull request #3741: [HUDI-2501] Add HoodieData abstraction and refactor compaction actions in hudi-client module

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yanghua commented on a change in pull request #3741:
URL: https://github.com/apache/hudi/pull/3741#discussion_r725413346



##########
File path: hudi-common/src/main/java/org/apache/hudi/common/data/HoodieData.java
##########
@@ -0,0 +1,72 @@
+/*
+ * 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.common.data;
+
+import org.apache.hudi.common.function.SerializableFunction;
+
+import java.io.Serializable;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Properties;
+
+/**
+ * An abstraction for a data collection of objects in type T to store the reference
+ * and do transformation.
+ *
+ * @param <T> type of object.
+ */
+public abstract class HoodieData<T> implements Serializable {

Review comment:
       Glad to see that we toward a simpler direction. HoodieData contains some operation APIs. WDYT about those similar operation APIs exists in `HoodieEngineContext`? Will we remove them and make  `HoodieEngineContext` to be a pure context object?




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