Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Zookeeper >> mail # dev >> order of async requests to zookeeper

Copy link to this message
Re: order of async requests to zookeeper
are all of these requests being issued from the same zookeeper handle?


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