[GitHub] [ozone] guohao-rosicky commented on a change in pull request #3023: HDDS-6229. [Ozone-Streaming] Data Channel abstraction on datanode

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guohao-rosicky commented on a change in pull request #3023:
URL: https://github.com/apache/ozone/pull/3023#discussion_r800367867



##########
File path: hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/transport/server/ratis/StreamDataChannel.java
##########
@@ -0,0 +1,33 @@
+/*
+ * 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.hadoop.ozone.container.common.transport.server.ratis;
+
+import org.apache.ratis.proto.RaftProtos;
+import org.apache.ratis.statemachine.StateMachine;
+
+import java.io.IOException;
+
+/**
+ * For write state machine data.
+ */
+public interface StreamDataChannel extends StateMachine.DataChannel {
+
+  default void link(RaftProtos.LogEntryProto entry) throws IOException {
+  }

Review comment:
       @szetszwo 
   I add ​putBlock into the channel, please check the logic of smallFileChannel, blockData is temporarily stored in the channel, so I need to return blockData in the channel, Is this bad for channel abstraction.
   
   I added a comment in #2860, please see:
   https://github.com/apache/ozone/pull/2860/files#r800366861
   and
   https://github.com/apache/ozone/pull/2860/files#r800366033
   




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