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From Jun Rao <jun...@gmail.com>
Subject Re: Location of Logging Files/How To Turn On Logging For Kafka Components
Date Fri, 14 Nov 2014 22:48:32 GMT
You need to set the location of log4j.properties in a JVM variable. Take a
look at the kafka scripts in bin/

Thanks,

Jun

On Thu, Nov 13, 2014 at 10:53 PM, Alex Melville <amelville@g.hmc.edu> wrote:

> Hi Jun,
>
> These are the two lines of log4j-related warnings I get when I try to run
> my producer:
>
> log4j:WARN No appenders could be found for logger
> (kafka.utils.VerifiableProperties).
>
> log4j:WARN Please initialize the log4j system properly.
>
>
> I have searched extensively online and have so far not found how to
> "initialize the log4j system" properly. All I want is to create debug
> logging so I can better find why my producer fails to send messages to the
> broker cluster.
>
>
>
> Alex
>
> On Thu, Nov 6, 2014 at 3:31 PM, Jun Rao <junrao@gmail.com> wrote:
>
> > The log4j entries before that error should tell you the cause of the
> error.
> >
> > Thanks,
> >
> > Jun
> >
> > On Tue, Nov 4, 2014 at 11:25 PM, Alex Melville <amelville@g.hmc.edu>
> > wrote:
> >
> > > Background:
> > >
> > > I have searched for a while online, and through the files located in
> the
> > > kafka/logs directory, trying to find where kafka writes log output to
> in
> > > order to debug the SimpleProducer I wrote. My producer is almost
> > identical
> > > to the simple producer located here
> > >
> > >
> https://cwiki.apache.org/confluence/display/KAFKA/0.8.0+Producer+Example
> > >
> > > except for I'm using Protobuffers instead of Strings to publish data
> to a
> > > cluster. I'm receiving the following error when I try to run the
> > > SimpleProducer
> > >
> > > Exception in thread "main" kafka.common.FailedToSendMessageException:
> > > Failed to send messages after 3 tries.
> > >
> > > at
> > >
> > >
> >
> kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:90)
> > >
> > > at kafka.producer.Producer.send(Producer.scala:76)
> > >
> > > at kafka.javaapi.producer.Producer.send(Producer.scala:33)
> > >
> > > at stream.SimpleProducer.send(Unknown Source)
> > >
> > > at stream.SimpleProducer.main(Unknown Source)
> > >
> > >
> > > I know this isn't a network problem, because I ran the console-producer
> > and
> > > successfully published data to the same broker that my Simple Producer
> is
> > > trying to publish to. I now want to try to debug this error.
> > >
> > >
> > >
> > > Question:
> > >
> > > Where would my Simple Producer write info about its startup and
> eventual
> > > error, such that I can read it and try to reason as to why it failed?
> If
> > it
> > > produces no log data on its own, what is the best way to write this
> data
> > to
> > > a somewhere where I can use it to debug? I've noticed that log4j,
> which I
> > > understand is a often-used library for logging in Java, came with my
> > kafka
> > > download. Am I supposed to use log4j for this info? I do not know very
> > much
> > > about log4j, so any info on how to get this setup would also be
> > > appreciated.
> > >
> > >
> > > -Alex
> > >
> >
>

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