message: Remove the LOG(FATAL) when encounting the unknown log type
diff: @@ -292,7 +292,7 @@ bool Part::commitLogs(std::unique_ptr<LogIterator> iter) {
  break;
  }
  default: {
  - LOG(FATAL) << idStr_ << "Unknown operation: " << static_cast<uint8_t>(log[0]);
  + LOG(WARNING) << idStr_ << "Unknown operation: " << static_cast<int32_t>(log[0]);
  }
  }
  