qiaojialin commented on a change in pull request #258: [IOTDB-143]Development 
of merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r314575470
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/engine/merge/recover/LogAnalyzer.java
 ##########
 @@ -0,0 +1,295 @@
+/**
+ * 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 static org.apache.iotdb.db.engine.merge.recover.MergeLogger.*;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.*;
+import java.util.Map.Entry;
+import org.apache.iotdb.db.engine.merge.manage.MergeResource;
+import org.apache.iotdb.db.engine.merge.task.MergeTask;
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.tsfile.read.common.Path;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * LogAnalyzer scans the "merge.log" file and recovers information such as 
files of last merge,
+ * the last available positions of each file and how many timeseries and files 
have been merged.
+ */
+public class LogAnalyzer {
+
+  private static final Logger logger = 
LoggerFactory.getLogger(LogAnalyzer.class);
+
+  private MergeResource resource;
+  private String taskName;
+  private File logFile;
+
+  private Map<File, Long> fileLastPositions = new HashMap<>();
+  private Map<File, Long> tempFileLastPositions = new HashMap<>();
+
+  private List<Path> mergedPaths = new ArrayList<>();
+  private List<Path> unmergedPaths;
+  private List<TsFileResource> unmergedFiles;
+  private String currLine;
+
+  private Status status;
+
+  public LogAnalyzer(MergeResource resource, String taskName, File logFile) {
+    this.resource = resource;
+    this.taskName = taskName;
+    this.logFile = logFile;
+  }
+
+  /**
+   * Scan through the logs to find out where the last merge has stopped and 
store the information
+   * about the progress in the fields.
+   * @return a Status indicating the completed stage of the last merge.
+   * @throws IOException
+   */
+  public Status analyze() throws IOException {
+    status = Status.NONE;
+    try (BufferedReader bufferedReader = new BufferedReader(new 
FileReader(logFile))) {
+      currLine = bufferedReader.readLine();
+      if (currLine != null) {
+        analyzeSeqFiles(bufferedReader);
+
+        analyzeUnseqFiles(bufferedReader);
+
+        analyzeUnmergedSeries(bufferedReader);
+
+        analyzeMergedSeries(bufferedReader, unmergedPaths);
+
+        analyzeMergedFiles(bufferedReader);
+      }
+    }
+    return status;
+  }
+
+  private void analyzeUnmergedSeries(BufferedReader bufferedReader) throws 
IOException {
+    if (!STR_TIMESERIES.equals(currLine)) {
+      return;
+    }
+    long startTime = System.currentTimeMillis();
+    List<Path> paths = new ArrayList<>();
+    while ((currLine = bufferedReader.readLine()) != null) {
+      if (STR_MERGE_START.equals(currLine)) {
+        break;
+      }
+      paths.add(new Path(currLine));
+    }
+    if (logger.isDebugEnabled()) {
+      logger.debug("{} found {} seq files after {}ms", taskName, paths.size(),
+              (System.currentTimeMillis() - startTime));
+    }
+    unmergedPaths = paths;
+  }
+
+  private void analyzeSeqFiles(BufferedReader bufferedReader) throws 
IOException {
+    if (!STR_SEQ_FILES.equals(currLine)) {
+      return;
+    }
+    long startTime = System.currentTimeMillis();
+    List<TsFileResource> mergeSeqFiles = new ArrayList<>();
+    while ((currLine = bufferedReader.readLine()) != null) {
+      if (STR_UNSEQ_FILES.equals(currLine)) {
+        break;
+      }
+      Iterator<TsFileResource> iterator = resource.getSeqFiles().iterator();
+      while (iterator.hasNext()) {
+        TsFileResource seqFile = iterator.next();
+        if (seqFile.getFile().getAbsolutePath().equals(currLine)) {
 
 Review comment:
   could this resource list be different from the log file?

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