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From Matthieu Morel <>
Subject Re: hedwig hubs and bookkeeper?
Date Thu, 15 Sep 2011 08:35:32 GMT
Hi Yang,

You may also want to have a look at this presentation by Ben Reed :

It's a great overview of Hedwig and it could help you understand it better.

Actually, it should probably be referenced from the bookkeeper wiki!


On Sep 15, 2011, at 10:12 AM, Flavio Junqueira wrote:

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.


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 ??



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