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From Patrick Hunt <ph...@apache.org>
Subject Re: Recommended session timeout
Date Mon, 23 Feb 2009 22:37:22 GMT
The latest docs (3.1.0 has some updates to that section) can be found here:
http://hadoop.apache.org/zookeeper/docs/r3.1.0/zookeeperProgrammers.html#ch_zkSessions

Patrick

Mahadev Konar wrote:
> 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" <joey42@gmail.com> wrote:
> 
>> Is there a recommended session timeout? Does it change based on the
>> ensemble size?
>>
>> Thanks,
>>
>> -Joey
> 

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