On 06/04/2010 11:27 PM, Pete Zaitcev wrote:
I heard people say they cribbed from the same Chubby paper, but
it's bollocks. It's absolutely nothing like what Chubby implies.
No locks for one thing. To be sure, Zookeeper provides a canned
piece of code which implements locks, kinda like you can implement
compare-and-swap using Dekker's algorithm on a CPU that doesn't
have it. The canned lock creates "sequenced" files (using a ZK
server call that creates unique filenames), then sets some
"watches" (same as CLD offers), then re-reads the directory to
find the lowest number sequential file, which is the winner of
the lock. Haha, only serious. I tested it, it works, but ewwwww.
Yeah, the main similarity is... both ZK and CLD offer some type of
filesystem (with all that implies). ZK is IMO not much like Chubby at
all, in terms of focus / design goals.
Jeff
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