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Zookeeper, mail # user - Get sequence number without node creation


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Re: Get sequence number without node creation
Ivan Kelly 2011-11-18, 09:20
Hi Vitalii,

You could try create(EPHEMERAL | SEQUENTIAL) so that if you loss your session, the znode will disappear.

-Ivan

On 17 Nov 2011, at 10:59, Vitalii Tymchyshyn wrote:

> Hello.
>
> I have a feature request I'd like to discuss: How about a call that will
> give next sequential node number without node creation. Main reason is
> that in many cases this would allow retries without leak on reconnect, e.g.:
> Now:
> 1) create(SEQUENTIAL) - disconnect - retry - and you've just leaked a node
> Can be
> 2) incrementCounter() - create(name). And you can make a retry in any
> place. The worst thing that can occur is that you will have a hole in
> your numbering
>
> Another cases this can help are simple counters (no need to create nodes
> at all) or simply different sequential nodes naming schema.
>
> Best regards, Vitalii Tymchyshyn