Badhusha Muhammed created KAFKA-16808:
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Summary: Consumer join Group requests response contains 2
different members
Key: KAFKA-16808
URL: https://issues.apache.org/jira/browse/KAFKA-16808
Project: Kafka
Issue Type: Bug
Components: clients
Affects Versions: 2.8.0
Reporter: Badhusha Muhammed
Fix For: 2.8.0
Even though there is only one consumer running for a group.id, On group
(re)-join, We are getting 2 different members in response, Which is causing
assignment to assign partition to different members, and only processing half
of the partition.
Log for group join and partition assignment
{code:java}
24/05/13 10:26:28 WARN ProcessingTimeExecutor: Current batch is falling
behind. The trigger interval is 155000 milliseconds, but spent 391883
milliseconds
24/05/13 10:26:28 INFO ConsumerCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Giving away all assigned partitions as lost since generation has been
reset,indicating that consumer is no longer part of the group
24/05/13 10:26:28 INFO ConsumerCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Lost previously assigned partitions topic-0 topic-1 topic-2 topic-3 topic-4
topic-5 topic-6 topic-7
24/05/13 10:26:28 INFO AbstractCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
(Re-)joining group
24/05/13 10:26:28 INFO AbstractCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Group coordinator va2kafka014.va2.pubmatic.local:6667 (id: 2147482646 rack:
null) is unavailable or invalid due to cause: null.isDisconnected: true.
Rediscovery will be attempted.
24/05/13 10:26:28 INFO AbstractCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Rebalance failed.
org.apache.kafka.common.errors.DisconnectException
24/05/13 10:26:28 INFO YarnSchedulerBackend$YarnDriverEndpoint: Disabling
executor 436704.
24/05/13 10:26:28 INFO DAGScheduler: Executor lost: 436704 (epoch 0)
24/05/13 10:26:28 INFO BlockManagerMaster: Removed 436704 successfully in
removeExecutor
24/05/13 10:26:28 INFO YarnClusterScheduler: Executor 436704 on
va2aggr2503.va2.pubmatic.local killed by driver.
24/05/13 10:26:28 INFO ExecutorMonitor: Executor 436704 is removed. Remove
reason statistics: (gracefully decommissioned: 0, decommision unfinished: 0,
driver killed: 436456, unexpectedly exited: 399).
24/05/13 10:26:28 INFO AbstractCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Discovered group coordinator va2kafka014.va2.pubmatic.local:6667 (id:
2147482646 rack: null)
24/05/13 10:26:28 INFO AbstractCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
(Re-)joining group
24/05/13 10:26:31 INFO ConsumerCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Finished assignment for group at generation 6:
{consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3-d4448c3e-8f23-490b-b800-be15a14efd32=Assignment(partitions=[topic-4,
topic-5, topic-6, topic-7]),
consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3-0daf3497-feac-4eee-a5ca-596e2b2e1649=Assignment(partitions=[topic-0,
topic-1, topic-2, topic-3])}
24/05/13 10:26:31 INFO ConsumerCoordinator: [Consumer
clientId=consumer-spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0-3,
groupId=spark-kafka-source-c48ddb22-762b-4aa3-bf60-7541efb19b2a-1436000591-driver-0]
Adding newly assigned partitions: topic-0 topic-1 topic-2 topic-3{code}
Can this be due to the generation reset that we are doing on rebalancing code
on 2.8.0 which eventually got fixed on version 2.8.1
https://issues.apache.org/jira/browse/KAFKA-13214
{code:java}
else {
final RuntimeException exception = future.exception();
// we do not need to log error for memberId required,
// since it is not really an error and is transient
if (!(exception instanceof MemberIdRequiredException)) {
log.info("Rebalance failed.", exception);
}
resetJoinGroupFuture();
if (exception instanceof UnknownMemberIdException ||
exception instanceof RebalanceInProgressException ||
exception instanceof IllegalGenerationException ||
exception instanceof MemberIdRequiredException)
continue;
else if (!future.isRetriable())
throw exception;
resetStateAndRejoin(); <- this should be removed {code}
* Group Join request-1 got failed with generation(generationId=1, memberId=1)
(Join successfully completed on coordinator side , But got failure response.
coord got disconnected before response, Can be seen from above log)
* So, Generation got reset and started a rejoin before previous member
leaving the group, and new response contains 2 members.
So requesting the same patch to v2.8.0 to avoid multiple members in response
when we have only one consumer running for a group.id.
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