public void deserializeExistedJarToMD5(InputStream inputStream) throws IOException {
    int size = ReadWriteIOUtils.readInt(inputStream);
    while (size > 0) {
      existedJarToMD5.put(
          ReadWriteIOUtils.readString(inputStream), ReadWriteIOUtils.readString(inputStream));
      size--;
    }
  }
Validate whether the UDF can be dropped.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/UDFInfo.java