public String getSource() {
    return source;
  }
Create a new RemoteProcedureException that can be serialized. It is assumed that this came form
a local source.
@param source the host or thread name of the source
@param cause  the actual cause of the exception
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RemoteProcedureException.java