jt2594838 commented on a change in pull request #258: [IOTDB-143]Development of 
merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r314574266
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/engine/merge/recover/MergeLogger.java
 ##########
 @@ -0,0 +1,142 @@
+/**
+ * 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.recover;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.List;
+import org.apache.iotdb.db.engine.merge.manage.MergeResource;
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.tsfile.read.common.Path;
+
+/**
+ * MergeLogger records the progress of a merge in file "merge.log" as text 
lines.
+ */
+public class MergeLogger {
+
+  public static final String MERGE_LOG_NAME = "merge.log";
+
+  static final String STR_SEQ_FILES = "seqFiles";
+  static final String STR_UNSEQ_FILES = "unseqFiles";
+  static final String STR_TIMESERIES = "timeseries";
+  static final String STR_START = "start";
+  static final String STR_END = "end";
+  static final String STR_ALL_TS_END = "all ts end";
+  static final String STR_MERGE_START = "merge start";
+  static final String STR_MERGE_END = "merge end";
+
+  private BufferedWriter logStream;
+
+  public MergeLogger(String storageGroupDir) throws IOException {
+    logStream = new BufferedWriter(new FileWriter(new File(storageGroupDir, 
MERGE_LOG_NAME), true));
+  }
+
+  public void close() throws IOException {
+    logStream.close();
+  }
+
+  public void logTSStart(List<Path> paths) throws IOException {
+    logStream.write(STR_START);
+    for (Path path : paths) {
+      logStream.write(" " + path.getFullPath());
+    }
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logFilePositionUpdate(File file) throws IOException {
+    logStream.write(String.format("%s %d", file.getAbsolutePath(), 
file.length()));
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logTSEnd() throws IOException {
+    logStream.write(STR_END);
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logAllTsEnd() throws IOException {
+    logStream.write(STR_ALL_TS_END);
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logFileMergeStart(File file, long position) throws IOException {
+    logStream.write(String.format("%s %d", file.getAbsolutePath(), position));
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logFileMergeEnd() throws IOException {
+    logStream.write(STR_END);
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logMergeEnd() throws IOException {
+    logStream.write(STR_MERGE_END);
+    logStream.newLine();
+    logStream.flush();
+  }
+
+  public void logFiles(MergeResource resource) throws IOException {
+    logSeqFiles(resource.getSeqFiles());
+    logUnseqFiles(resource.getUnseqFiles());
+  }
+
+  public void logAllTS(List<Path> paths) throws IOException {
 
 Review comment:
   It is negligible compared to the merge task itself and it won't last for 
long. But now I get the paths from MManager,  it is not necessary to record 
them.

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