jt2594838 commented on a change in pull request #258: [IOTDB-143]Development of 
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r306607529

 File path: 
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+ * 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
+ * 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.task;
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import org.apache.commons.io.FileUtils;
+import org.apache.iotdb.db.engine.merge.manage.MergeContext;
+import org.apache.iotdb.db.engine.merge.manage.MergeResource;
+import org.apache.iotdb.db.engine.merge.recover.MergeLogger;
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.tsfile.exception.write.TsFileNotCompleteException;
+import org.apache.iotdb.tsfile.file.metadata.ChunkGroupMetaData;
+import org.apache.iotdb.tsfile.file.metadata.ChunkMetaData;
+import org.apache.iotdb.tsfile.read.TsFileSequenceReader;
+import org.apache.iotdb.tsfile.read.common.Chunk;
+import org.apache.iotdb.tsfile.read.common.Path;
+import org.apache.iotdb.tsfile.write.schema.FileSchema;
+import org.apache.iotdb.tsfile.write.writer.ForceAppendTsFileWriter;
+import org.apache.iotdb.tsfile.write.writer.RestorableTsFileIOWriter;
+import org.apache.iotdb.tsfile.write.writer.TsFileIOWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+ * MergeFileTask merges the merge temporary files with the seqFiles, either 
move the merged
+ * chunks in the temp files into the seqFiles or move the unmerged chunks into 
the merge temp
+ * files, depending on which one is the majority.
+ */
+class MergeFileTask {
+  private static final Logger logger = 
+  private String taskName;
+  private MergeContext context;
+  private MergeLogger mergeLogger;
+  private MergeResource resource;
+  private List<TsFileResource> unmergedFiles;
+  MergeFileTask(String taskName, MergeContext context, MergeLogger mergeLogger,
+      MergeResource resource, List<TsFileResource> unmergedSeqFiles) {
 Review comment:
   They are not always the same in a RecoverMergeTask and we may have already 
merged some files before the system was down.

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