flume spooldir bug修复

BUG:在往目录中copy大文件时，没有复制完,flume就开始读-->导致报错

在代码中体现为:
org.apache.flume.client.avro.ReliableSpoolingFileEventReader.retireCurrentFile()方法内

解决方案:
等文件完全拷贝完成，再开始读这个文件

1.5版本:

private Optional<FileInfo> getNextFile() {
 7   /* Filter to exclude finished or hidden files */
 8   FileFilter filter = new FileFilter() {
 9     public boolean accept(File candidate) {
10       String fileName = candidate.getName();
11       if ((candidate.isDirectory()) ||
12           (fileName.endsWith(completedSuffix)) ||
13           (fileName.startsWith(".")) ||
14           ignorePattern.matcher(fileName).matches()) {
15         return false;
16       }
17       return true;
18     }
19   };
20   List<File> candidateFiles = Arrays.asList(spoolDirectory.listFiles(filter)); //获取spoolDirectory下满足条件的文件
21   if (candidateFiles.isEmpty()) {
22     return Optional.absent();
23   } else {
24     Collections.sort(candidateFiles, new Comparator<File>() { //按最后修改时间排序文件
25       public int compare(File a, File b) {
26         int timeComparison = new Long(a.lastModified()).compareTo(
27             new Long(b.lastModified()));
28         if (timeComparison != 0) {
29           return timeComparison;
30         }
31         else {
32           return a.getName().compareTo(b.getName());
33         }
34       }
35     });
36     File nextFile = candidateFiles.get(0); //因为每次获取到的文件处理完都会被标记为已完成，所以直接取拍完序的第一个
37     //修复传输大文件报错文件被修改的BUG
38     this.checkFileCpIsOver(nextFile);//此处被阻塞，直到文件拷贝文件或者超过20秒
39
40     try {
41       // roll the meta file, if needed
42       String nextPath = nextFile.getPath()

1.7版本 :

  private Optional<FileInfo> getNextFile() {
    List<File> candidateFiles = Collections.emptyList();

    if (consumeOrder != ConsumeOrder.RANDOM ||
        candidateFileIter == null ||
        !candidateFileIter.hasNext()) {
      candidateFiles = getCandidateFiles(spoolDirectory.toPath());
      listFilesCount++;
      candidateFileIter = candidateFiles.iterator();
    }

    if (!candidateFileIter.hasNext()) { // No matching file in spooling directory.
      return Optional.absent();
    }

    File selectedFile = candidateFileIter.next();
    if (consumeOrder == ConsumeOrder.RANDOM) { // Selected file is random.
      return openFile(selectedFile);
    } else if (consumeOrder == ConsumeOrder.YOUNGEST) {
      for (File candidateFile : candidateFiles) {
        long compare = selectedFile.lastModified() -
            candidateFile.lastModified();
        if (compare == 0) { // ts is same pick smallest lexicographically.
          selectedFile = smallerLexicographical(selectedFile, candidateFile);
        } else if (compare < 0) { // candidate is younger (cand-ts > selec-ts)
          selectedFile = candidateFile;
        }
      }
    } else { // default order is OLDEST
      for (File candidateFile : candidateFiles) {
        long compare = selectedFile.lastModified() -
            candidateFile.lastModified();
        if (compare == 0) { // ts is same pick smallest lexicographically.
          selectedFile = smallerLexicographical(selectedFile, candidateFile);
        } else if (compare > 0) { // candidate is older (cand-ts < selec-ts).
          selectedFile = candidateFile;
        }
      }
    }

    firstTimeRead = true;

  //修复传输大文件报错文件被修改的BUG
    this.checkFileCpIsOver(selectedFile);//此处被阻塞，直到文件拷贝文件或者超过20秒
    return openFile(selectedFile);
  }

解决代码:

 /**
 *
 * @Title: checkFileCpIsOver
 * @Description: TODO(用来检查文件拷贝是否完成)
 * @param @param currentFile    设定文件
 * @return void    返回类型
 * @throws
 */
private void checkFileCpIsOver(File file) {
    long modified = file.lastModified();//目前文件的修改时间
    long length = file.length();//目前文件的大小
    try {
      Thread.sleep(1000);//等待1秒钟
    } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    File currentFile = new File(file.getAbsolutePath());
    int count = 0;//记录循环次数，超过20次，也就是10秒后抛出异常
    while(currentFile.lastModified() != modified || currentFile.length() != length) {
        if(count > 20) {
            String message = "File Copy time too long. please check copy whether exception!" + "\n"
                      + "File at :" + file.getAbsolutePath() + "\n"
                      + "File current length is：" + currentFile.lastModified();
            new IllegalStateException(message);
        }
        count++;
        modified = currentFile.lastModified();
        length = currentFile.length();
        try {
          Thread.sleep(500);//等待500毫秒
        } catch (InterruptedException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
        currentFile = new File(file.getAbsolutePath());

    }
    //一直到文件传输完成就可以退出
}