'Check whether rings have changed, and maybe do a recon update.
:returns: False if any ec ring has changed'

def is_healthy(self):

    now = time.time()
    if (now > self._next_rcache_update):
        self._next_rcache_update = (now + self.stats_interval)
        self.aggregate_recon_update()
    return (self.get_local_devices() == self.all_local_devices)
