Hi Yang, Hubs use BookKeeper to persist messages, but they are
different components in the system. BookKeeper does not implement Zab,
ZooKeeper does. Replication in BookKeeper uses a simple quorum protocol.
-Flavio
On Sep 15, 2011, at 9:15 AM, Yang wrote:
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
flavio
junqueira
research scientist
[email protected]
direct +34 93-183-8828
avinguda diagonal 177, 8th floor, barcelona, 08018, es
phone (408) 349 3300 fax (408) 349 3301
