I'm trying to understand how Hedwig works and its guarantees. from my understanding of the wiki, I guess that a hub is composed of all the servers of a bookkeeper cluster, right? then the BookKeeperPersistenceManager uses a bookkeeper client to write to the Ledger, which is replicated using ZAB protocol onto all the servers in the hub; and subscribers would call the persistence manager to read from the ledger ??
Thanks Yang
