jt2594838 commented on a change in pull request #258: [IOTDB-143]Development of 
merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r314573246
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/engine/merge/task/MergeTask.java
 ##########
 @@ -0,0 +1,158 @@
+/**
+ * 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.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.
+ *        3. remove unseqFiles
+ */
+public class MergeTask implements Callable<Void> {
+
+  public static final String MERGE_SUFFIX = ".merge";
+  private static final Logger logger = 
LoggerFactory.getLogger(MergeTask.class);
+
+  MergeResource resource;
+  String storageGroupDir;
+  MergeLogger mergeLogger;
+  MergeContext mergeContext = new MergeContext();
+
+  private MergeCallback callback;
+  int concurrentMergeSeriesNum;
+  String taskName;
+  boolean fullMerge;
+
+  MergeTask(List<TsFileResource> seqFiles,
+      List<TsFileResource> unseqFiles, String storageGroupDir, MergeCallback 
callback,
+      String taskName, boolean fullMerge) {
+    this.resource = new MergeResource(seqFiles, unseqFiles);
+    this.storageGroupDir = storageGroupDir;
+    this.callback = callback;
+    this.taskName = taskName;
+    this.fullMerge = fullMerge;
+    this.concurrentMergeSeriesNum = 1;
+  }
+
+  public MergeTask(MergeResource mergeResource, String storageGroupDir, 
MergeCallback callback,
+      String taskName, boolean fullMerge, int concurrentMergeSeriesNum) {
+    this.resource = mergeResource;
+    this.storageGroupDir = storageGroupDir;
+    this.callback = callback;
+    this.taskName = taskName;
+    this.fullMerge = fullMerge;
+    this.concurrentMergeSeriesNum = concurrentMergeSeriesNum;
+  }
+
+  @Override
+  public Void call() throws Exception {
+    try  {
+      doMerge();
+    } catch (Exception e) {
+      logger.error("Runtime exception in merge {}", taskName, e);
+      cleanUp(false);
+      // call the callback to make sure the StorageGroup exit merging status, 
but passing 2
+      // empty file lists to avoid files being deleted.
+      callback.call(Collections.emptyList(), Collections.emptyList(), new 
File(storageGroupDir, MergeLogger.MERGE_LOG_NAME));
+      throw e;
+    }
+    return null;
+  }
+
+  private void doMerge() throws IOException {
+    if (logger.isInfoEnabled()) {
+      logger.info("{} starts to merge {} seqFiles, {} unseqFiles", taskName,
+          resource.getSeqFiles().size(), resource.getUnseqFiles().size());
+    }
+    long startTime = System.currentTimeMillis();
+    long totalFileSize = MergeUtils.collectFileSizes(resource.getSeqFiles(),
+        resource.getUnseqFiles());
+    mergeLogger = new MergeLogger(storageGroupDir);
+
+    mergeLogger.logFiles(resource);
 
 Review comment:
   See the StorageGroupProcessor.merge() for the answer.

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