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 <ppi...@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 <ja...@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 <ja...@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.muralidha...@yottaa.com> wrote: > > > >> I have this same problem . Can someone help ? > >> > >> --Dhyan > >> > >> On Wed, Nov 25, 2015 at 3:31 PM, Marina <ppi...@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
