Re: [bailey-developers] SF.net SVN: bailey: [17] trunk/src

[Doug C. <cu...@ap...>]

Ning Li wrote:
>>  I think each node can determine that on its own at startup.  It
>>
>>  1. Posts its range and log start number.
>>  2. Waits a bit, so all other nodes have had a chance to post their data.
>>  3. Decides if its index is valid, by checking all overlapping node's log
>>  start numbers & compares them with the last sync'd log number to see if
>>  they've compacted their log.
>>  4. Starts syncing with its neighbors.
> 
> Data in Zookeeper is persistent, right? So there are records in Zookeeper
> on the range, log start number and log start numbers on neighbors
> of a node. So what does it mean if, at startup, a node's posted numbers
> are newer or older than those in Zookeeper? Can the data in Zookeeper
> help during startup? Or do we discard those records in Zookeeper?

Zookeeper can store data that's persistent or that disappears when a 
node disappears.  I think the most natural representation in Zookeeper 
would be to make the live ring to be represented by ephemeral files.

Doug