[jira] [Created] (KAFKA-8715) Static consumer cannot join group due to ERROR in broker

["Raman Gupta (JIRA)" <ji...@apache.org>]

Raman Gupta created KAFKA-8715:
----------------------------------

             Summary: Static consumer cannot join group due to ERROR in broker
                 Key: KAFKA-8715
                 URL: https://issues.apache.org/jira/browse/KAFKA-8715
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 2.3.0
            Reporter: Raman Gupta


A streams consumer using a static group instance id is unable to join the group due to an invalid group join  -- the consumer gets the error:

```
ERROR stream-thread [x-stream-4a43d5d4-d38f-4cb0-8741-7a6c685abf15-StreamThread-1] Encountered the following unexpected Kafka exception during processing, this usually indicate Streams internal errors: [[EXCEPTION: org.apache.kafka.common.KafkaException: Unexpected error in join group response: The server experienced an unexpected error when processing the request.
```

On the broker, I see this error:

```
[2019-07-25 08:14:11,978] ERROR [KafkaApi-1] Error when handling request: clientId=x-stream-4a43d5d4-d38f-4cb0-8741-7a6c685abf15-StreamThread-1-consumer, correlationId=6, api=JOIN_GROUP, body={group_id=x-stream,session_timeout_ms=10000,rebalance_timeout_ms=300000,member_id=,group_instance_id=lcrzf-1,protocol_type=consumer,protocols=[{name=stream,metadata=java.nio.HeapByteBuffer[pos=0 lim=64 cap=64]}]} (kafka.server.KafkaApis)
java.util.NoSuchElementException: None.get
  at scala.None$.get(Option.scala:366)
  at scala.None$.get(Option.scala:364)
  at kafka.coordinator.group.GroupMetadata.generateMemberId(GroupMetadata.scala:368)
  at kafka.coordinator.group.GroupCoordinator.$anonfun$doUnknownJoinGroup$1(GroupCoordinator.scala:178)
  at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
  at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:253)
  at kafka.coordinator.group.GroupMetadata.inLock(GroupMetadata.scala:209)
  at kafka.coordinator.group.GroupCoordinator.doUnknownJoinGroup(GroupCoordinator.scala:169)
  at kafka.coordinator.group.GroupCoordinator.$anonfun$handleJoinGroup$2(GroupCoordinator.scala:144)
  at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:253)
  at kafka.coordinator.group.GroupMetadata.inLock(GroupMetadata.scala:209)
  at kafka.coordinator.group.GroupCoordinator.handleJoinGroup(GroupCoordinator.scala:136)
  at kafka.server.KafkaApis.handleJoinGroupRequest(KafkaApis.scala:1389)
  at kafka.server.KafkaApis.handle(KafkaApis.scala:124)
  at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:69)
  at java.base/java.lang.Thread.run(Thread.java:834)
```



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