parquet-hadoop/src/main/java/org/apache/parquet/hadoop/util/SerializationUtil.java
public static void writeObjectToConfAsBase64(String key, Object obj, Configuration conf) throws IOException {
    try(ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
      try(GZIPOutputStream gos = new GZIPOutputStream(baos);
            ObjectOutputStream oos = new ObjectOutputStream(gos)) {
        oos.writeObject(obj);
      }
      conf.set(key, new String(Base64.encodeBase64(baos.toByteArray()), StandardCharsets.UTF_8));
    }
  }
public static void writeObjectToConfAsBase64(String key, Object obj, Configuration conf) throws IOException {
    try(ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
      try(GZIPOutputStream gos = new GZIPOutputStream(baos);
            ObjectOutputStream oos = new ObjectOutputStream(gos)) {
        oos.writeObject(obj);
      }
      conf.set(key, new String(Base64.encodeBase64(baos.toByteArray()), StandardCharsets.UTF_8));
    }
  }
Writes an object to a configuration.

@param key for the configuration
@param obj the object to write
@param conf to read from
@throws IOException if there is an error while writing