qiaojialin commented on a change in pull request #258: [IOTDB-143]Development 
of merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r313716134

 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.manage;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.engine.StorageEngine;
+import org.apache.iotdb.db.engine.merge.task.MergeTask;
+import org.apache.iotdb.db.exception.StorageEngineException;
+import org.apache.iotdb.db.service.IService;
+import org.apache.iotdb.db.service.ServiceType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+ * MergeManager provides a ThreadPool to queue and run all merge tasks to 
restrain the total
+ * resources occupied by merge and manages a Timer to periodically issue a 
global merge.
+ */
+public class MergeManager implements IService {
+  private static final Logger logger = 
+  private static final MergeManager INSTANCE = new MergeManager();
+  private AtomicInteger threadCnt = new AtomicInteger();
 Review comment:
   Do we need to separate the merge thread and merge chunk sub-thread counter?

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