qiaojialin commented on a change in pull request #258: [IOTDB-143]Development 
of merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r313774688
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/engine/merge/selector/MergeFileSelector.java
 ##########
 @@ -0,0 +1,34 @@
+/**
+ * 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.engine.merge.selector;
+
+import java.util.List;
+import org.apache.iotdb.db.exception.MergeException;
+
+/**
+ * MergeFileSelector selects a set of files from given seqFiles and unseqFiles 
which can be
+ * merged without exceeding given memory budget.
+ */
+public interface MergeFileSelector {
 
 Review comment:
   ```suggestion
   public interface IMergeFileSelector {
   ```

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