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From Ivan Kelly <i...@ivankelly.net>
Subject Re: Session timeout parameter question
Date Thu, 30 Oct 2014 12:43:27 GMT
Yes, if the partition occurs 1/3 of the timeout past the last time the
server has heard from the client. If the partition happens just after
the server has heard from the client and only last 2/3 of the timeout,
the session will probably not be timed out. The server will not
timeout a session until it hasn't heard from the client for the whole
session timeout period.

-Ivan

On 30 October 2014 13:05, Alen Čaljkušić <scuderiaforever@gmail.com> wrote:
> Hi ZooKeeper community
>
> I have a question about session timeout parameter. Quote from ZooKeeper
> book by Flavio Junqueira and Benjamin Reed:
>
> "One important parameter you should set when creating a session is the
> session timeout, which is the amount of time the ZooKeeper service allows a
> session before declaring it expired. If the service does not see message
> associated to a given session during time t, it declares session expired.
> On the client side, if it has heard nothing from the server at 1/3 of t, it
> sends a heartbeat message to the server. At 2/3 of t, the ZooKeeper client
> starts looking for a different server, and it has another 1/3 of t to find
> one."
>
> Does this imply that network failure between client and all servers lasting
> 2/3 of session timeout parameter may cause session expired?

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