Hi Joey,
 here is a link to information on session timeouts.
http://hadoop.apache.org/zookeeper/docs/r3.0.1/zookeeperProgrammers.html#ch_
zkSessions
  
The session timeouts depends on how sensitive you want your application to
be. A very low session timeout like (1-2 seconds) might lead to your
application being very sensitive to events like minor network problems etc.,
a higher values of say (30 seconds) on the other hand might lead to slow
detection of client failures -- example one of the zookeeper client which
has ephemeral node goes down, in this case the ephemeral nodes will only go
away after session timeout.

I have seen some users using 10-15 seconds of session timeout, but you
should use as per your application requirements.

Hope this helps.
mahadev


On 2/22/09 3:09 AM, "Joey Echeverria" <joe...@gmail.com> wrote:

> Is there a recommended session timeout? Does it change based on the
> ensemble size?
> 
> Thanks,
> 
> -Joey

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