By using quorum. One of the partitions will may be able to acquire
locks, the other one won't...
On 01/06/2012 03:36 PM, Drew Kutcharian wrote:
Bryce,
I'm not sure about ZooKeeper, but I know if you have a partition between
HazelCast nodes, than the nodes can acquire the same lock independently in each
divided partition. How does ZooKeeper handle this situation?
-- Drew
On Jan 6, 2012, at 12:48 PM, Bryce Allen wrote:
On Fri, 6 Jan 2012 10:03:38 -0800
Drew Kutcharian<d...@venarc.com> wrote:
I know that this can be done using a lock manager such as ZooKeeper
or HazelCast, but the issue with using either of them is that if
ZooKeeper or HazelCast is down, then you can't be sure about the
reliability of the lock. So this potentially, in the very rare
instance where the lock manager is down and two users are registering
with the same email, can cause major issues.
For most applications, if the lock managers is down, you don't acquire
the lock, so you don't enter the critical section. Rather than allowing
inconsistency, you become unavailable (at least to writes that require
a lock).
-Bryce
