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Zookeeper, mail # dev - order of async requests to zookeeper


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Ted Yu 2011-12-23, 02:09
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Re: order of async requests to zookeeper
Benjamin Reed 2011-12-23, 02:45
are all of these requests being issued from the same zookeeper handle?

ben

On Thu, Dec 22, 2011 at 6:09 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
> Hi,
> The following originated from discussion on a feature in HBase which relies
> on zookeeper for coordination.
>
> A task is removed from the tasks map. An async ZK request is pending to
> remove the task's zk node.
>
>  Another request arrives for this to-be-deleted task. A new in-memory task
> structure is created. A ZK request is scheduled to create the same task
> node.
>
>  Problem will only occur if create-node executes before delete-node in ZK.
> (If create-node returns NODEEXISTS then we treat that as success).
>
> Does ZK re-order async requests?
>
> Thanks
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Ted Yu 2011-12-23, 18:43
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Mahadev Konar 2011-12-27, 00:23
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Ted Yu 2011-12-27, 01:53
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Ted Dunning 2011-12-27, 05:23
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Patrick Hunt 2011-12-27, 19:05