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From "Ibrahim El-sanosi (PGR)" <i.s.el-san...@newcastle.ac.uk>
Subject RE: Latency in asynchronous mode
Date Thu, 23 Oct 2014 14:29:07 GMT
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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