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From Mahadev Konar <maha...@yahoo-inc.com>
Subject Re: Dealing with session expired
Date Thu, 12 Feb 2009 19:12:57 GMT
Hi Tom,
  We prefer to discard the zookeeper instance if a session expires.
Maintaining a one to one relationship between a client handle and a session
makes it much simpler for users to understand the existence and
disappearance of ephemeral nodes and watches created by a zookeeper client.


On 2/12/09 10:58 AM, "Tom Nichols" <tmnichols@gmail.com> wrote:

> I've come across the situation where a ZK instance will have an
> expired connection and therefore all operations fail.  Now AFAIK the
> only way to recover is to create  a new ZK instance with the old
> session ID, correct?
> Now, my problem is, the ZK instance may be shared -- not between
> threads -- but maybe two classes in the same thread synchronize on
> different nodes by using different watchers.  So it makes sense that
> one ZK client instance can handle this.  Except that even if I detect
> the session expiration by catching the KeeperException, if I want to
> "resume" the session, I have to create a new ZK instance and pass it
> to any classes who were previously sharing the same instance.  Does
> this make sense so far?
> Anyway, bottom line is, it would be nice if a ZK instance could itself
> recover a session rather than discarding that instance and creating a
> new one.
> Thoughts?
> Thanks in advance,
> -Tom

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