On 09/17/2012 02:00 PM, Robin Bate Boerop wrote:
I am about to implement a locking algorithm based on the below modification to
the Zookeeper-website-recommended one. Does anyone else have experience with
this?
Thank you, Michi, for the suggestion below.
________________________________________
From: [email protected] [[email protected]] on behalf of Michi Mutsuzaki
[[email protected]]
Sent: 15 September 2012 02:32
To: [email protected]
Subject: Re: question about lock recipe and watchers
You could set the watch using get() instead of exists(). These watches
get set if and only if the znode exists, and they get triggered when
the znode goes away.
I tried out Michi's suggestion over the weekend and it seems to be
working great. I just used a one-byte get() in place of the exists()
call recommended in the recipe. I'm actually using wget(), to be
precise. The wget() either returns an error immediately (because the
node has already been deleted) or else returns successfully and queues a
watcher that triggers when the node is deleted later. There is no need
to set a value in the node.
-Phil
