public final void persistent(String filePath) throws IOException {
    try (FileWriter confOutput = new FileWriter(filePath, true)) {
      properties.store(confOutput, null);
    }
  }
Persistent the properties to the file.

@param filePath the file path.
@throws IOException if properties storage failed.
integration-test/src/main/java/org/apache/iotdb/it/env/cluster/config/MppBaseConfig.java