xingtanzjr commented on a change in pull request #5294:
URL: https://github.com/apache/iotdb/pull/5294#discussion_r830790762



##########
File path: 
server/src/main/java/org/apache/iotdb/db/mpp/buffer/IDataBlockManager.java
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@@ -0,0 +1,80 @@
+/*
+ * 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.iotdb.db.mpp.buffer;
+
+import org.apache.iotdb.db.mpp.common.TsBlock;
+import org.apache.iotdb.db.mpp.schedule.task.FragmentInstanceID;
+import org.apache.iotdb.db.mpp.schedule.task.FragmentInstanceTask;
+
+public interface IDataBlockManager {
+
+  /**
+   * Register a new fragment instance. The block manager will start looking 
for upstream data blocks
+   * and flushing data blocks generated to downstream fragment instances.
+   */
+  void registerFragmentInstance(FragmentInstanceTask task);

Review comment:
       A simple question here.
   
   Do we need FragmentInstanceTask to have some interfaces to tell the 
BlockManager its source and sink info ? Or we only do the registration here and 
the corresponding operator inside the fragment will trigger it later




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