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From Guozhang Wang <wangg...@gmail.com>
Subject Re: Kafka 0.8.2.1 - how to read from __consumer_offsets topic?
Date Thu, 03 Dec 2015 19:10:56 GMT
If you can validate these partitions have data (i.e. there are some offsets
committed to Kafka), then you may have to turn of debug level logging in
configs/tools-log4j.properties which will allow console consumer to print
debug level logs and see if there is anything suspicious.

Guozhang

On Thu, Dec 3, 2015 at 10:55 AM, Marina <ppine7@yahoo.com.invalid> wrote:

> Hi, Guozhang,
> Yes, I can see this topic and partitions in ZK:
>
> ls /brokers/topics/__consumer_offsets
> [partitions]
> ls /brokers/topics/__consumer_offsets/partitions
> [44, 45, 46, 47, 48, 49, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0, 1, 2,
> 3, 4, 5, 6, 7, 8, 9, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
> 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43]
>
>
> example of one partition state:
> ls /brokers/topics/__consumer_offsets/partitions/44
> [state]
> ls /brokers/topics/__consumer_offsets/partitions/44/state
> []
>
>
> anything else you think I could check?
>
> thanks!
> Marina
>
>
>
> ----- Original Message -----
> From: Guozhang Wang <wangguoz@gmail.com>
> To: "users@kafka.apache.org" <users@kafka.apache.org>; Marina <
> ppine7@yahoo.com>
> Sent: Thursday, December 3, 2015 12:05 PM
> Subject: Re: Kafka 0.8.2.1 - how to read from __consumer_offsets topic?
>
> Marina,
>
> To check if the topic does exist in Kafka (i.e. offsets are stored in Kafka
> instead of in ZK) you can check this path in ZK:
>
> /brokers/topics/__consumer_offsets
>
> By default this topic should have 50 partitions.
>
> Guozhang
>
>
>
> On Thu, Dec 3, 2015 at 6:22 AM, Marina <ppine7@yahoo.com.invalid> wrote:
>
> > Hi, Jason,
> >
> > I tried the same command both with specifying a formatter and without -
> > same result:
> >
> > => /opt/kafka/bin/kafka-console-consumer.sh --formatter
> > kafka.server.OffsetManager\$OffsetsMessageFormatter --consumer.config
> > /tmp/consumer.properties --topic __consumer_offsets --zookeeper
> > localhost:2181 --from-beginning
> >
> > ^CConsumed 0 messages
> >
> >
> > When you are saying to make sure Consumers are using Kafka instead of ZK
> > storage for offset... - what is the best way to do that? I thought
> checking
> > the content via ZK shell - at this path:
> > /consumers/<consumer_group_name>/offsets/<topic_name>/<partition_number>
> >
> > would be a definitive confirmation (there are no values stored there). Is
> > it true?
> >
> > I feel it is some small stupid mistake I'm making, since it seems to work
> > fine for others - drives me crazy :)
> >
> > thanks!!
> > Marina
> >
> >
> >
> > ----- Original Message -----
> > From: Jason Gustafson <jason@confluent.io>
> > To: users@kafka.apache.org
> > Sent: Wednesday, December 2, 2015 2:33 PM
> > Subject: Re: Kafka 0.8.2.1 - how to read from __consumer_offsets topic?
> >
> > Hey Marina,
> >
> > My mistake, I see you're using 0.8.2.1. Are you also providing the
> > formatter argument when using console-consumer.sh? Perhaps something like
> > this:
> >
> > bin/kafka-console-consumer.sh --formatter
> > kafka.server.OffsetManager\$OffsetsMessageFormatter --zookeeper
> > localhost:2181 --topic __consumer_offsets --from-beginning
> >
> > You may also want to confirm that your consumers are using Kafka instead
> of
> > Zookeeper for offset storage. If you still don't see anything, we can
> > always look into the partition data directly...
> >
> > -Jason
> >
> >
> > On Wed, Dec 2, 2015 at 11:13 AM, Jason Gustafson <jason@confluent.io>
> > wrote:
> >
> > > Looks like you need to use a different MessageFormatter class, since it
> > > was renamed in 0.9. Instead use something like
> > > "kafka.coordinator.GroupMetadataManager\$OffsetsMessageFormatter".
> > >
> > > -Jason
> > >
> > > On Wed, Dec 2, 2015 at 10:57 AM, Dhyan Muralidharan <
> > > d.muralidharan@yottaa.com> wrote:
> > >
> > >> I have this same problem . Can someone help ?
> > >>
> > >> --Dhyan
> > >>
> > >> On Wed, Nov 25, 2015 at 3:31 PM, Marina <ppine7@yahoo.com.invalid>
> > wrote:
> > >>
> > >> > Hello,
> > >> >
> > >> > I'm trying to find out which offsets my current High-Level consumers
> > are
> > >> > working off. I use Kafka 0.8.2.1, with **no** "offset.storage" set
> in
> > >> the
> > >> > server.properties of Kafka - which, I think, means that offsets are
> > >> stored
> > >> > in Kafka. (I also verified that no offsets are stored in Zookeeper
> by
> > >> > checking this path in the Zk shell:
> > >> >
> > >>
> >
> **/consumers/<consumer_group_name>/offsets/<topic_name>/<partition_number>**
> > >> > )
> > >> >
> > >> > I tried to listen to the **__consumer_offsets** topic to see which
> > >> > consumer saves what value of offsets, but it did not work...
> > >> >
> > >> > I tried the following:
> > >> >
> > >> > created a config file for console consumer as following:
> > >> >
> > >> >
> > >> >     => more kafka_offset_consumer.config
> > >> >
> > >> >      exclude.internal.topics=false`
> > >> >
> > >> > and tried to versions of the console consumer scripts:
> > >> >
> > >> >     #1:
> > >> >     bin/kafka-console-consumer.sh --consumer.config
> > >> > kafka_offset_consumer.config --topic __consumer_offsets --zookeeper
> > >> > localhost:2181
> > >> >
> > >> >     #2
> > >> >     ./bin/kafka-simple-consumer-shell.sh --topic __consumer_offsets
> > >> > --partition 0 --broker-list localhost:9092 --formatter
> > >> > "kafka.server.OffsetManager\$OffsetsMessageFormatter"
> > --consumer.config
> > >> > kafka_offset_consumer.config
> > >> >
> > >> >
> > >> > Neither worked - it just sits there but does not print anything,
> even
> > >> > though the consumers are actively consuming/saving offsets.
> > >> >
> > >> > Am I missing some other configuration/properties ?
> > >> >
> > >> > thanks!
> > >> >
> > >> > Marina
> > >> >
> > >> > I have also posted this question on StackOverflow:
> > >> >
> > >> >
> > >> >
> > >>
> >
> http://stackoverflow.com/questions/33925866/kafka-0-8-2-1-how-to-read-from-consumer-offsets-topic
> > >> >
> > >>
> > >
> > >
> >
>
>
>
> --
> -- Guozhang
>



-- 
-- Guozhang

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