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From Steven Wu <stevenz...@gmail.com>
Subject Re: high cpu and network traffic when cluster has no topic
Date Wed, 04 Feb 2015 04:52:24 GMT
sure. will try my unit test again with 0.8.2.0 release tomorrow and report
back my findings.

On Tue, Feb 3, 2015 at 8:42 PM, Jay Kreps <jay.kreps@gmail.com> wrote:

> Hey Steven,
>
> That sounds like a bug. I think we fixed a few producer high cpu issues
> since the beta, I wonder if you could repeat the same test with the 0.8.2.
> final release?
>
> -Jay
>
> On Tue, Feb 3, 2015 at 8:37 PM, Steven Wu <stevenz3wu@gmail.com> wrote:
>
> > actually, my local test can reproduce the issue although not immediately.
> > seems to happen after a few mins. I enabled TRACE level logging. here
> seems
> > to be the tight loop. you can see that there are two metadata requests in
> > one milli-seconds.
> >
> > kafka-producer-network-thread | foo 20:34:32,626 TRACE NetworkClient:301
> -
> > Ignoring empty metadata response with correlation id 360185.
> > kafka-producer-network-thread | foo 20:34:32,626 DEBUG NetworkClient:369
> -
> > Trying to send metadata request to node -2
> > kafka-producer-network-thread | foo 20:34:32,626 DEBUG NetworkClient:374
> -
> > Sending metadata request ClientRequest(expectResponse=true, payload=null,
> >
> >
> request=RequestSend(header={api_key=3,api_version=0,correlation_id=360186,client_id=foo},
> > body={topics=[]})) to node -2
> > kafka-producer-network-thread | foo 20:34:32,626 TRACE NetworkClient:301
> -
> > Ignoring empty metadata response with correlation id 360186.
> > kafka-producer-network-thread | foo 20:34:32,626 DEBUG NetworkClient:369
> -
> > Trying to send metadata request to node -2
> >
> >
> > On Tue, Feb 3, 2015 at 8:10 PM, Steven Wu <stevenz3wu@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > We have observed high cpu and high network traffic problem when
> > > 1) cluster (0.8.1.1) has no topic
> > > 2) KafkaProducer (0.8.2-beta) object is created without sending any
> > traffic
> > >
> > > We have observed such problem twice. In both cases, problem went away
> > > immediately after one/any topic is created.
> > >
> > > Is this a known issue? Just want to check with the community first
> before
> > > I spend much time to reproduce it.
> > >
> > > I couldn't reproduce the issue with similar setup with unit test code
> in
> > > IDE. start two brokers with no topic locally on my laptop. create a
> > > KafkaProducer object without sending any msgs. but I only tested with
> > > 0.8.2-beta for both broker and producer.
> > >
> > > Thanks,
> > > Steven
> > >
> >
>

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