We use ZK for some incrementing counters and this is method that does it
(this is wrapped in a Thrift call) :
public long getNextSequenceId()
{
Stat stat = null;
String path = "/<cluster name>/" + "/SequenceId";
try
{
stat = zk_.setData( path , new byte[0] , -1);
}
catch (InterruptedException ie)
{
// handle it.
}
catch (KeeperException ke)
{
// handle it.
}
return stat.getMzxid();
}
Avinash
On Mon, Mar 29, 2010 at 11:40 AM, Eric Hauser <ewhau...@gmail.com> wrote:
> That's good to know. I've often seen high latency between availability
> zones.
>
> BTW, does anyone from Digg patrol the list? I'm really interested in some
> additional the implementation of atomic counters with ZooKeeper.
>
>
> On Mon, Mar 29, 2010 at 1:58 PM, Joe Stump <j...@joestump.net> wrote:
>
>>
>> On Mar 29, 2010, at 11:55 AM, Eric Hauser wrote:
>>
>> > Does the information is the below link about Cassandra and replication
>> over WAN have any merit or is it just FUD?
>>
>> I can attest Cassandra works fine over inter-DC connections. We have ~20
>> nodes spread across three Amazon "Availability Zones". I know Digg is doing
>> bi-coastal Cassandra as well without issues.
>>
>> Cassandra was specifically built to work well over WAN / intermittently
>> failing connections / setups.
>>
>> --Joe
>>
>>
>
