https://hadoop.apache.org/docs/r2.8.2/hadoop-project-dist/hadoop-common/api/org/apache/hadoop/ipc/protobuf/IpcConnectionContextProtos.UserInformationProto.Builder.html
IpcConnectionContextProtos.UserInformationProto.Builder (Apache Hadoop Common 2.8.2 API)
apache hadoopbuildercommonapi