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https://issues.apache.org/jira/browse/KAFKA-3231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143005#comment-15143005
 ] 

Curtis Allen commented on KAFKA-3231:
-------------------------------------

Using https://github.com/Shopify/sarama via 
https://github.com/bsm/sarama-cluster

Using a simple command line client 
(https://github.com/bsm/sarama-cluster/blob/master/cmd/sarama-cluster-cli/main.go),
 the offsets seem to be persisted because I can the following messages in the 
kafka log

{code}
[2016-02-11 08:34:53,771] INFO [Group Metadata Manager on Broker 0]: Finished 
loading offsets from [__consumer_offsets,47] in 6 milliseconds. 
(kafka.coordinator.GroupMetadataManager)
[2016-02-11 08:34:53,771] INFO [Group Metadata Manager on Broker 0]: Loading 
offsets and group metadata from [__consumer_offsets,4] 
(kafka.coordinator.GroupMetadataManager)
[2016-02-11 08:34:53,778] INFO [Group Metadata Manager on Broker 0]: Finished 
loading offsets from [__consumer_offsets,4] in 7 milliseconds. 
(kafka.coordinator.GroupMetadataManager)
{code}


Started the client using 
{code}
go run cmd/sarama-cluster-cli/main.go -brokers=127.0.0.1:9092 -group=testgroup 
-offset=oldest -topics=test -verbose=true
{code}

> describe group IllegalArgumentException for kafka-consumer-groups
> -----------------------------------------------------------------
>
>                 Key: KAFKA-3231
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3231
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 0.9.0.0
>            Reporter: Curtis Allen
>            Assignee: Neha Narkhede
>            Priority: Minor
>
> The kafka-consumer-groups tool doesn't seem to work when describing new 
> consumer groups. 
> Listing groups work
> {code}
> $ ./bin/kafka-consumer-groups.sh --new-consumer --bootstrap-server 
> 127.0.0.1:9092 --list
> testgroup
> {code}
> Describing throws an exception
> {code}
> $ ./kafka-consumer-groups.sh --new-consumer --bootstrap-server 127.0.0.1:9092 
> --describe --group testgroup
> Error while executing consumer group command Error reading field 'user_data': 
> java.lang.IllegalArgumentException
> org.apache.kafka.common.protocol.types.SchemaException: Error reading field 
> 'user_data': java.lang.IllegalArgumentException
>       at org.apache.kafka.common.protocol.types.Schema.read(Schema.java:71)
>       at 
> org.apache.kafka.clients.consumer.internals.ConsumerProtocol.deserializeAssignment(ConsumerProtocol.java:109)
>       at 
> kafka.admin.AdminClient$$anonfun$describeConsumerGroup$1.apply(AdminClient.scala:165)
>       at 
> kafka.admin.AdminClient$$anonfun$describeConsumerGroup$1.apply(AdminClient.scala:164)
>       at scala.collection.immutable.List.map(List.scala:273)
>       at kafka.admin.AdminClient.describeConsumerGroup(AdminClient.scala:164)
>       at 
> kafka.admin.ConsumerGroupCommand$KafkaConsumerGroupService.describeGroup(ConsumerGroupCommand.scala:314)
>       at 
> kafka.admin.ConsumerGroupCommand$ConsumerGroupService$class.describe(ConsumerGroupCommand.scala:84)
>       at 
> kafka.admin.ConsumerGroupCommand$KafkaConsumerGroupService.describe(ConsumerGroupCommand.scala:302)
>       at kafka.admin.ConsumerGroupCommand$.main(ConsumerGroupCommand.scala:63)
>       at kafka.admin.ConsumerGroupCommand.main(ConsumerGroupCommand.scala)
> {code}



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