Hi Marina, You can hop onto your brokers and dump your __consumer_offsets logs manually in order to see if anything is in them. Hop on each of your brokers and run the following command:
for f in $(find /path/to/kafka-logs/__consumer_offsets-* -name "*\.log"); do /usr/local/kafka/bin/kafka-run-class.sh kafka.tools.DumpLogSegments --print-data-log --files $f ; done Remember to replace /path/to/kafka-logs with your configured log.dirs location, and /usr/local/kafka/ with wherever you have installed kafka. If that command doesn't generate any output (Starting offset: 0 followed by nothing) on any of your brokers, then your consumers are for some reason not committing offsets to Kafka. Keep in mind that commits to __consumer_offsets by the consumer API use groupID, Topic, and PartitionID to key off of in order to determine which partition of __consumer_offsets to save the commit message to. This means that if you're not running many consumers/topics, you could have partitions with nothing in them and others with lots. Keep this in mind when using -simple-consumer scripts as the simple consumer only pulls from one partition at a time. On Thu, Dec 3, 2015 at 11:10 AM, Guozhang Wang <wangg...@gmail.com> wrote: > 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 <ppi...@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 <wangg...@gmail.com> > > To: "users@kafka.apache.org" <users@kafka.apache.org>; Marina < > > ppi...@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 <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 > > > > > > -- > -- Guozhang >
