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From Alexander Shraer <shra...@gmail.com>
Subject RE: Latency in asynchronous mode
Date Thu, 23 Oct 2014 15:02:18 GMT
I still stay with my previous explanation :) in async mode each client
invokes many ops concurrently resulting in a longer queue at the leader
On Oct 23, 2014 3:32 PM, "Ibrahim El-sanosi (PGR)" <
i.s.el-sanosi@newcastle.ac.uk> wrote:

> Thank you Alexander for  replay,
>
> In fact, I use more than one clients (one, two, three, four ......., ten),
> in both modes (synchronous  and asynchronous). So, I found the latency in
> Asynchronous Mode is much higher than latency in synchronous   mode. I am
> really wondering why I am getting such a big different.
>
> In synchronous  mode, the latency vary between min/avr/max=5/20/50 and
> min/avr/max=11/50/120, but it is never reach min/avg/max: 1/371/627 as in
> asynchronous  mode.
>
> Any thought?
>
> Thank you
>
> -----Original Message-----
> From: Alexander Shraer [mailto:shralex@gmail.com]
> Sent: Thursday, October 23, 2014 02:14 م
> To: user@zookeeper.apache.org
> Subject: Re: Latency in asynchronous mode
>
> Maybe due to queueing at the leader in asynchronous mode - if in your
> experiment you have one client in sync mode the leader has just one op in
> the queue at a time On Oct 23, 2014 1:57 PM, "Ibrahim" <
> i.s.el-sanosi@newcastle.ac.uk> wrote:
>
> > Hi folks,
> >
> > I am testing ZooKeeper latency in Asynchronous mode. I am sending
> > update
> > (write) requests to Zookeeper cluster that consists of 5 physical
> > Zookeeper.
> >
> > So, when I run the stat command I get high latency like:
> > Latency min/avg/max: 7/339/392
> > Latency min/avg/max: 1/371/627
> > Latency min/avg/max: 1/371/627
> > Latency min/avg/max: 1/364/674
> > I guess such high latency correspond to fsync (batch requests). But I
> > wish if someone could help me and explain this behaviour.
> >
> > However, testing Zookeeper using Synchronous mode, it gives me
> > reasonable result like:
> > Latency min/avg/max: 6/24/55
> > Latency min/avg/max: 7/22/61
> > Latency min/avg/max: 7/30/65
> >
> > Note that the latency measures in milliseconds.
> >
> > I look forward to hearing from you.
> >
> > Ibrahim
> >
> >
> >
> >
> >
> >
> >
> > --
> > View this message in context:
> > http://zookeeper-user.578899.n2.nabble.com/Latency-in-asynchronous-mod
> > e-tp7580446.html Sent from the zookeeper-user mailing list archive at
> > Nabble.com.
> >
>

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