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From Patrick Hunt <ph...@apache.org>
Subject Re: Zookeeper latency calculation
Date Sun, 21 Jul 2019 23:13:21 GMT
High max latency is typically due to gc, slow disk, or issues with vm
oversubscription. Turn on gc logging and verify. I've used strace in the
past to troubleshoot disk issues (fsync - although now a days it's in the
log).

Patrick

On Thu, Jul 18, 2019 at 8:40 AM rammohan ganapavarapu <
rammohanganap@gmail.com> wrote:

> I do have a busy system total packet processed by zk is like 60k/s (30k
> send and 30k received) and how about the max latencies? is ti always
> constant ? for me avg latency is 0 but max latency is showing 40s how is it
> possible?
>
>
>
>
> On Wed, Jul 17, 2019 at 8:46 PM Michael Han <hanm@apache.org> wrote:
>
> > Typing send too soon...
> >
> > >> always give avg_latency "0"
> >
> > The latency metrics depends on workloads. Try hit your cluster hard with
> > some artificially generated heavy read / write workloads, you will see
> the
> > number deviates from 0.
> >
> > >> If I recall correctly avg_latency is an int, not float
> >
> > This is now a float on master branch, and the change was made in
> > ZOOKEEPER-2641. I remember this because this actually breaks one of our
> > internal metrics system, where our system expects an int (the old type).
> >
> > On Wed, Jul 17, 2019 at 8:43 PM Michael Han <hanm@apache.org> wrote:
> >
> > > >> always give avg_latency "0"
> > >
> > > The latency metrics depends on workloads.
> > >
> > > On Wed, Jul 17, 2019 at 1:34 AM Enrico Olivelli <eolivelli@gmail.com>
> > > wrote:
> > >
> > >> Il mar 16 lug 2019, 19:05 rammohan ganapavarapu <
> > rammohanganap@gmail.com>
> > >> ha scritto:
> > >>
> > >> > Hi,
> > >> >
> > >> > I am trying to understand how zookeeper latency calculated, mntr
> > command
> > >> > always give avg_latency "0", can some one help how to calculate avg
> > >> request
> > >> > latency in zookeeper?
> > >> >
> > >>
> > >>
> > >> Are you also taking metrics on the client?
> > >> Maybe on the server side the value is biased by very fast ops
> > >>
> > >>
> > >> Enrico
> > >>
> > >> >
> > >> >
> > >> > Thanks,
> > >> > Ram
> > >> >
> > >>
> > >
> >
>

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