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From Evan Huus <evan.h...@shopify.com>
Subject Re: cpu over-consumption in Kafka producer -?
Date Wed, 15 Apr 2015 18:17:55 GMT
Check the offset you're asking for, and check what offsets actually exist
on your cluster. It sounds like they don't line up.

On Wed, Apr 15, 2015 at 2:10 PM, Victor L <vlyamtsev@gmail.com> wrote:

> I see the following error in consumer;
> Unable to Receive Message:kafka server: The requested offset is outside the
> range of offsets maintained by the server for the given topic/partition
>
> On Wed, Apr 15, 2015 at 2:09 PM, Victor L <vlyamtsev@gmail.com> wrote:
>
> > I set it to 10ms and it did fix cpu consumption problem but i don't see
> > any messages coming up in consumer queue
> >
> > On Wed, Apr 15, 2015 at 1:57 PM, Evan Huus <evan.huus@shopify.com>
> wrote:
> >
> >> The field is a time.Duration (https://golang.org/pkg/time/#Duration)
> and
> >> it
> >> is the maximum duration to buffer messages before triggering a flush to
> >> the
> >> broker. The default was 1 millisecond (this value does not even exist in
> >> the most recent release). Setting it to higher values trades off latency
> >> for efficiency, whatever your use case dictates.
> >>
> >> Evan
> >>
> >> On Wed, Apr 15, 2015 at 1:47 PM, Victor L <vlyamtsev@gmail.com> wrote:
> >>
> >> > I inherited this code, it just set to 1000, what would be reasonable
> >> time:
> >> > 1000 * time.Millisecond?
> >> >
> >> > On Wed, Apr 15, 2015 at 1:41 PM, Evan Huus <evan.huus@shopify.com>
> >> wrote:
> >> >
> >> > > On Wed, Apr 15, 2015 at 1:33 PM, Victor L <vlyamtsev@gmail.com>
> >> wrote:
> >> > >
> >> > > > Hi Evan,
> >> > > > It's hardcoded:
> >> > > > MaxBufferTime       = 1000
> >> > > >
> >> > >
> >> > > Without any units this defaults to nanoseconds, which means your
> >> timer is
> >> > > spinning every microsecond. You probably mean 1000 *
> time.Millisecond?
> >> > >
> >> > >
> >> > > > MaxBufferedBytes    = 1024
> >> > > >
> >> > > > How's it versioned? Should i just download zip file from project
> >> > github?
> >> > > >
> >> > >
> >> > > By default go will use whatever version you originally checked out
> >> with
> >> > `go
> >> > > get` or the like. You can use a properly versioned copy via
> >> > > http://gopkg.in/Shopify/sarama.v1.
> >> > >
> >> > >
> >> > > >  On Wed, Apr 15, 2015 at 12:48 PM, Evan Huus <
> evan.huus@shopify.com
> >> >
> >> > > > wrote:
> >> > > >
> >> > > > > Hi Victor, two points:
> >> > > > >
> >> > > > > - Based on the backtrace, you are using a very old version
of
> >> Sarama.
> >> > > You
> >> > > > > might have better luck using a more recent stable version.
> >> > > > > - Are you setting `MaxBufferTime` in the configuration to
0 or a
> >> very
> >> > > > small
> >> > > > > value? If so the loop will spin on that timer. Try making
this
> >> value
> >> > > > > larger.
> >> > > > >
> >> > > > > Evan
> >> > > > >
> >> > > > > On Wed, Apr 15, 2015 at 12:35 PM, Victor L <vlyamtsev@gmail.com
> >
> >> > > wrote:
> >> > > > >
> >> > > > > > I am using sarama "golang" kafka 1.8.1 client (
> >> > > > > > https://github.com/Shopify/sarama)  to send messages
to
> message
> >> > > queue
> >> > > > > once
> >> > > > > > in 3secs and this task drives cpu consumption to 130%
on the
> >> > quad-cpu
> >> > > > > > blade; The number stays this high regardless of number
of
> >> > > > > > partitions/consumers.... According to results of profiling
> with
> >> > > > 'pprof',
> >> > > > > > most of the cycles are spent in producer.go/NewBrokerProducer;
> >> > > > > > Total: 47297 samples
> >> > > > > >     5947  12.6%  12.6%    15013  31.7% selectgo
> >> > > > > >     3617   7.6%  20.2%     3617   7.6% runtime.xchg
> >> > > > > >     2819   6.0%  26.2%    28506  60.3%
> >> > > > > github.com/Shopify/sarama.funcĀ·008
> <http://github.com/Shopify/sarama.func%C2%B7008>
> >> <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > > <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > > > <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > > > > <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > > > > > <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > > > > > <http://github.com/Shopify/sarama.func%C2%B7008>
> >> > > > > >
> >> > >
> ----------------------------------------------------------------------
> >> > > > > > NewBrokerProducer
> >> > > > > > -----------------------------------------------------------
> >> > > > > > 229:     go func() {
> >> > > > > >      .      .  230:         timer :=
> >> > > > > time.NewTimer(p.config.MaxBufferTime)
> >> > > > > >      .      .  231:         var shutdownRequired bool
> >> > > > > >      .      .  232:         wg.Done()
> >> > > > > >      .      .  233:         for {
> >> > > > > >    208  17598  234:             select {
> >> > > > > >    153    749  235:             case <-bp.flushNow:
> >> > > > > >      .      .  236:                 if shutdownRequired
=
> >> > > bp.flush(p);
> >> > > > > > shutdownRequired {
> >> > > > > >      .      .  237:                     goto shutdown
> >> > > > > >      .      .  238:                 }
> >> > > > > >   2230   3144  239:             case <-timer.C:
> >> > > > > >    144   3606  240:                 if shutdownRequired
=
> >> > > > > > bp.flushIfAnyMessages(p); shutdownRequired {
> >> > > > > >      .      .  241:                     goto shutdown
> >> > > > > >
> >> > > > > >
> >> > > > > > wonder if there's some known issue with this method
or if
> anyone
> >> > > > already
> >> > > > > > seen it before...
> >> > > > > > Thank you,
> >> > > > > >
> >> > > > >
> >> > > >
> >> > >
> >> >
> >>
> >
> >
>

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