[KAFKA-13405] Kafka Streams restore-consumer fails to refresh broker IPs after upgrading Kafka cluster

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Not A Bug
• Affects Version/s: 2.8.0, 2.7.1
• Component/s: streams
• Assignee: Unassigned
• Reporter: Daniel O'Halloran
• Created: 26/Oct/21 15:47
• Updated: 18/Jan/23 11:52
• Resolved: 19/Nov/21 17:49

Description

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

1. Upgrade brokers from Kafka 2.7 to Kafka 2.8
2. Ensure old brokers are completely shut down
3. 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

Issue Links

• is duplicated by: KAFKA-14548 Stable streams applications stall due to infrequent restoreConsumer polls
• is related to: KAFKA-14548 Stable streams applications stall due to infrequent restoreConsumer polls
• mentioned in: Page Loading...