code: private void setupTaskLogFileAccess(TaskControllerContext context) {
      TaskAttemptID taskId = context.task.getTaskID();
      File f = TaskLog.getTaskLogFile(taskId, TaskLog.LogName.SYSLOG);
      String taskAttemptLogDir = f.getParentFile().getAbsolutePath();
      changeDirectoryPermissions(taskAttemptLogDir, FILE_PERMISSIONS, false);
    }
docs: the task log directory