TL;DR This jira tracks the effort of moving PB helper methods, which convert client side data structure to and from protobuf, to the hadoop-hdfs-client module.
Currently the PBHelper class contains helper methods converting both client and server side data structures from/to protobuf. As we move client (and common) classes to hadoop-hdfs-client module (see
HDFS-8053 and HDFS-9039), we also need to move client module related PB converters to client module.
A good place may be a new class named PBHelperClient. After this, the existing PBHelper class stays in hadoop-hdfs module with converters for converting server side data structures.