jt2594838 commented on a change in pull request #258: [IOTDB-143]Development of 
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r313672394

 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.File;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.Callable;
+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.db.utils.MergeUtils;
+import org.apache.iotdb.tsfile.read.common.Path;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+ * MergeTask merges given seqFiles and unseqFiles into a new one, which 
basically consists of three
+ * steps: 1. rewrite overflowed, modified or small-sized chunks into temp 
merge files
+ *        2. move the merged chunks in the temp files back to the seqFiles or 
move the unmerged
+ *        chunks in the seqFiles int temp files and replace the seqFiles with 
the temp files.
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