qiaojialin commented on a change in pull request #258: [IOTDB-143]Development 
of merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r313686847
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/engine/merge/task/RecoverMergeTask.java
 ##########
 @@ -0,0 +1,267 @@
+/**
+ * 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.task;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map.Entry;
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.engine.merge.recover.LogAnalyzer;
+import org.apache.iotdb.db.engine.merge.recover.LogAnalyzer.Status;
+import org.apache.iotdb.db.engine.merge.recover.MergeLogger;
+import org.apache.iotdb.db.engine.merge.selector.MaxSeriesMergeFileSelector;
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.db.utils.MergeUtils;
+import org.apache.iotdb.tsfile.file.metadata.ChunkMetaData;
+import org.apache.iotdb.tsfile.read.common.Path;
+import org.apache.iotdb.tsfile.write.writer.RestorableTsFileIOWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * RecoverMergeTask is an extension of MergeTask, which resumes the last merge 
progress by
+ * scanning merge.log using LogAnalyzer and continue the unfinished merge.
+ */
+public class RecoverMergeTask extends MergeTask {
+
+  private static final Logger logger = 
LoggerFactory.getLogger(RecoverMergeTask.class);
+
+  private LogAnalyzer analyzer;
+
+  public RecoverMergeTask(List<TsFileResource> seqFiles,
+      List<TsFileResource> unseqFiles, String storageGroupDir,
 
 Review comment:
   ```suggestion
         List<TsFileResource> unseqFiles, String storageGroupSysDir,
   ```

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