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From Alex Melville <amelvi...@g.hmc.edu>
Subject Re: Location of Logging Files/How To Turn On Logging For Kafka Components
Date Fri, 14 Nov 2014 06:53:49 GMT
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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