final Map<InetAddress, UUID> versions = new ConcurrentHashMap<InetAddress, UUID>();
final Set<InetAddress> liveHosts = Gossiper.instance.getLiveMembers();
final Message msg = new Message(FBUtilities.getLocalAddress(), StorageService.Verb.SCHEMA_CHECK, ArrayUtils.EMPTY_BYTE_ARRAY);
final CountDownLatch latch = new CountDownLatch(liveHosts.size());
// an empty message acts as a request to the SchemaCheckVerbHandler.
MessagingService.instance.sendRR(msg, liveHosts.toArray(new InetAddress[]{}), new IAsyncCallback()
{
public void response(Message msg)
{
// record the response from the remote node.
logger.debug("Received schema check response from " + msg.getFrom().getHostAddress());