Hi Jaln, Sorry for the delay in answering.
> I have a question about the indexing in bookkeeper, > when I use hedwig pub/sub, each topic can have many subscribers, and > each subscriber can subscribe to different topics, > is this indexing handled by zookkeeper, or bookkeeper? The indexing is "handled" by hedwig, but the metadata is indeed stored in zookeeper. > > In bookkeeper, when is a new ledger is created? is it created when there is > a new topic? Each topic in hedwig is a sequence of ledgers. Ledgers can be viewed as log segments, so the history of messages on a topic is a sequence of these log segments. There will only ever be one ledger per topic at any one time. When a ledger becomes big (like 10,000 messages or something, the boundary is arbitrary), the current ledger is closed and a new one is created. Hope this helps, Ivan
