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Zookeeper, mail # user - Dealing with an expired session


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Re: Dealing with an expired session
Patrick Hunt 2012-06-27, 17:54
On Tue, Jun 26, 2012 at 1:25 PM, David Nickerson
<[EMAIL PROTECTED]> wrote:
> Is there any guarantee of order? For example, does the default watcher
> receive the notification first?
>

No, no guarantee.

Patrick

> On Tue, Jun 26, 2012 at 11:35 AM, Rakesh R <[EMAIL PROTECTED]> wrote:
>
>> When the ZK disconnects/synconnects/expires all the watchers will get the
>> notifications. I think, you should have the KeeperState checks in the
>> respctive watchers and can do the thread handling logics.
>> ________________________________________
>> From: David Nickerson [[EMAIL PROTECTED]]
>> Sent: Tuesday, June 26, 2012 8:20 PM
>> To: ZooKeeper mailing list
>> Subject: Dealing with an expired session
>>
>> In my locking implementation, if a thread wants to wait for a lock, it will
>> create a watcher object, set a watch on the lock before it, and wait on the
>> watcher. When the watch gets triggered, the watcher notifies any threads
>> that are waiting on it.
>>
>> If the session expires, I would like to wake up all of the threads that are
>> waiting for a lock. To my understanding, only the default watcher receives
>> a notification that the session has expired. If this is the case, then I
>> need to maintain a list somewhere of all of the watchers that threads are
>> waiting on so that I can notify them all.
>>
>> Does this sound correct?
>>