[jira] [Created] (KAFKA-4349) Consumer group describe exception when group state is PreparingRebalance

["Vahid Hashemian (JIRA)" <ji...@apache.org>]

Vahid Hashemian created KAFKA-4349:
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             Summary: Consumer group describe exception when group state is PreparingRebalance
                 Key: KAFKA-4349
                 URL: https://issues.apache.org/jira/browse/KAFKA-4349
             Project: Kafka
          Issue Type: Bug
            Reporter: Vahid Hashemian
            Assignee: Vahid Hashemian


When the group state is {{PreparingRebalance}} the consumer group describe raises the following exception:
{code}
Error: Executing consumer group command failed due to Error reading field 'version': java.nio.BufferUnderflowException
org.apache.kafka.common.protocol.types.Schema.read(Schema.java:73)
org.apache.kafka.clients.consumer.internals.ConsumerProtocol.deserializeAssignment(ConsumerProtocol.java:106)
kafka.admin.AdminClient$$anonfun$1.apply(AdminClient.scala:155)
kafka.admin.AdminClient$$anonfun$1.apply(AdminClient.scala:154)
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
scala.collection.Iterator$class.foreach(Iterator.scala:727)
scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
scala.collection.AbstractIterable.foreach(Iterable.scala:54)
scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
scala.collection.AbstractTraversable.map(Traversable.scala:105)
kafka.admin.AdminClient.describeConsumerGroup(AdminClient.scala:154)
kafka.admin.ConsumerGroupCommand$KafkaConsumerGroupService.collectGroupAssignment(ConsumerGroupCommand.scala:391)
kafka.admin.ConsumerGroupCommand$ConsumerGroupService$class.describeGroup(ConsumerGroupCommand.scala:139)
kafka.admin.ConsumerGroupCommand$KafkaConsumerGroupService.describeGroup(ConsumerGroupCommand.scala:379)
kafka.admin.ConsumerGroupCommand$.main(ConsumerGroupCommand.scala:70)
kafka.admin.ConsumerGroupCommand.main(ConsumerGroupCommand.scala)
{code}

The exception is a side-effect of the fix for KAFKA-3144 that misses handling this edge case.



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