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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: Serious problem processing hearbeat on login stampede
Date Fri, 01 Jul 2011 16:03:07 GMT
Thanks for the feedback Jared!

(and thanks to Chang as well!)

On Fri, Jul 1, 2011 at 8:06 AM, Jared Cantwell <jared.cantwell@gmail.com>wrote:

> As a note, I believe we just used this patch to solve a major issue ...
>
> Thanks Chang!
> ~Jared
>
> On Tue, Apr 19, 2011 at 10:59 AM, Ted Dunning <ted.dunning@gmail.com>
> wrote:
>
> > Where is this set?
> >
> > Why does this cause this problem?
> >
> > 2011/4/19 Chang Song <tru64ufs@me.com>
> >
> > >
> > > Problem solved.
> > > it was socket linger option set to 2 sec timeout.
> > >
> > > We have verified that the original problem goes away when we turn off
> > > linger option.
> > > No longer a mystery ;)
> > >
> > >
> > > https://issues.apache.org/jira/browse/ZOOKEEPER-1049
> > >
> > >
> > > Chang
> > >
> > >
> > > 2011. 4. 19., 오전 3:16, Mahadev Konar 작성:
> > >
> > > > Camille, Ted,
> > > > Can we continue the discussion on
> > > > https://issues.apache.org/jira/browse/ZOOKEEPER-1049?
> > > >
> > > > We should track all the suggestions/issues on the jira.
> > > >
> > > > thanks
> > > > mahadev
> > > >
> > > > 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.
> > > >>>
> > > >>
> > > >
> > > >
> > > >
> > > > --
> > > > thanks
> > > > mahadev
> > > > @mahadevkonar
> > >
> > >
> >
>

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