[sheepdog] [PATCH 1/4] zookeeper: remove unneccessary zk operation

[Kai Zhang]

On Jul 6, 2013, at 10:17 AM, Liu Yuan <namei.unix at gmail.com> wrote:

> Only there is only one sheep (who sends BLOCK) will have block->callbacked set
> true. We have to update all the state of sheep from blocked to unblock, we need
> to broadcast notify.

I think we can update all the state of sheep from blocked to unblock by broadcasting
'UNBLOCK'. But currently, we broadcast 'UNBLOCK' and 'NOTIFY'.
I think we can merge them.

One 'UNBLOCK' can act as the same as before except reduce on broadcast action.

Thanks,
Kyle
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