Daniel O'Halloran created KAFKA-13405:
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Summary: Kafka Streams restore-consumer fails to refresh broker
IPs after upgrading Kafka cluster
Key: KAFKA-13405
URL: https://issues.apache.org/jira/browse/KAFKA-13405
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 2.7.1, 2.8.0
Reporter: Daniel O'Halloran
Attachments: KafkaConfig.txt, KafkaLogs.txt
*+Description+*
After upgrading our Kafka clusters from 2.7 to 2.8 the Streams
restore-consumers never update their broker IPs.
The applications continue to process events as normal, until there is a
rebalance.
Once a rebalance occurs the restore consumers attempts to connect to the old
brokers IPs indefinitely and the streams tasks never go back into a RUNNING
state.
We were able to replicate this behaviour with kafka-streams client libraries
2.5.1, 2.7.1 and 2.8.0
*+Steps to reproduce+*
# Upgrade brokers from Kafka 2.7 to Kafka 2.8
# Ensure old brokers are completely shut down
# Trigger a rebalance of a streams application
*+Expected result+*
* Application rebalances as normal
*+Actual Result+*
* Application cannot restore its data
* restore consumer tries to connect to old brokers indefinitely
*+Observations+*
* The cluster metadata was updated on all stream consumer threads during the
broker upgrade (multiple times) as the new brokers were brought online
(corresponding to leader election occurring on the subscribed partitions),
however no cluster metadata was logged on the restore-consumer thread.
* None of the original broker IPs are valid/accessible after the upgrade (as
expected)
* No partition rebalance occurs during the kafka upgrade process.
* When the first re-balance was triggered after upgrade, the restore-consumer
loops failing to connect on each of the 3 original IPs, but none of the new
broker IPs.
*+Workaround+*
* Restart our applications after upgrading our Kafka cluster
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