BoundedRecoveredHFilesOutputSink wants to read TableDescriptor so it writes the particular hfile format specified by a table's schema. Getting the table schema can be tough at various points of operation especially around startup.
HBASE-23739 tried to read from the fs if unable to read TableDescriptor from Master. This approach works generally but fails in standalone mode as in standalone mode we will have given-up our start up attempt BEFORE the request to Master for TableDescriptor times out (the read from fs is never attempted).
The suggested patch here does away w/ reading TableDescriptor and just has BoundedRecoveredHFilesOutputSink write generic hfiles.