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From Mahadev Konar <maha...@apache.org>
Subject Re: Serious problem processing hearbeat on login stampede
Date Mon, 18 Apr 2011 18:16:36 GMT
Camille, Ted,
 Can we continue the discussion on

We should track all the suggestions/issues on the jira.


On Mon, Apr 18, 2011 at 9:03 AM, Ted Dunning <ted.dunning@gmail.com> wrote:
> Interesting.  It does seem to suggestion the session expiration is
> expensive.
> There is a concurrent table in guava that provides very good multi-threaded
> performance.  I think that is achieved by using a number of locks and then
> distributing threads across the locks according to the hash slot being used.
>  But I would have expected any in memory operation to complete very quickly.
> Is it possible that the locks on the session table are held longer than they
> should be?
> 2011/4/18 Fournier, Camille F. [Tech] <Camille.Fournier@gs.com>
>> Is it possible this is related to this report back in February?
>> http://mail-archives.apache.org/mod_mbox/zookeeper-user/201102.mbox/%3C6642FC1CAF133548AA8FDF497C547F0A23C0C5265B@NYWEXMBX2126.msad.ms.com%3E
>> I theorized that the issue might be due to synchronization on the session
>> table, but never got enough information to finish the investigation.


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