message: Add auto-padding log
diff: @@ -275,6 +275,7 @@ bool TaskExecutor<TaskT>::move_task_to_batch(
  }
  TaskT* previous_task = nullptr;
  + int padding_task_count = 0;
  while (!_task_queue.empty()) {
  TaskT* task = _task_queue.front();
  @@ -327,6 +328,7 @@ bool TaskExecutor<TaskT>::move_task_to_batch(
  if (batchTask.padding(task) != 2) {
  break;
  }
  + ++padding_task_count;
  size_t rem = batchTask.append_task(task);
  previous_task = task;
  if (task->rem <= 0) {
  @@ -334,6 +336,11 @@ bool TaskExecutor<TaskT>::move_task_to_batch(
  }
  if (rem <= 0) break;
  }
  +
  + if (padding_task_count > 1) {
  + LOG(INFO) << "Hit auto padding, merge " << padding_task_count
  + << " tasks into 1 batch.";
  + }
  LOG(INFO) << "Number of tasks remaining in _task_queue is"
  << _task_queue.size();
  return true;
  