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)" < [email protected]> 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:[email protected]] > Sent: Thursday, October 23, 2014 02:14 م > To: [email protected] > 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" < > [email protected]> 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. > > >
