Set the value of isPrimary.

        :param value: the value to set isPrimary to

def primaryName(self, value: Optional[str]) -> None:
        """
        Set the value of isPrimary.

        :param value: the value to set isPrimary to
        """
        if value is not None:
            self.warned_no_primary = False
        self.primaryNames[self.viewNo] = value
        self.compact_primary_names()
        if value != self._primaryName:
            self._primaryName = value
            self.logger.info("{} setting primaryName for view no {} to: {}".
                             format(self, self.viewNo, value))
            if value is None:
                # Since the GC needs to happen after a primary has been
                # decided.
                return
            self._gc_before_new_view()
            if self.__should_reset_watermarks_before_new_view():
                self._reset_watermarks_before_new_view()