[MXS-3807] Using the binlog router as the source for KafkaCDC router is unreliable Created: 2021-10-07  Updated: 2022-12-09  Resolved: 2021-12-09

Status: Closed
Project: MariaDB MaxScale
Component/s: cdc
Affects Version/s: 6.1.4
Fix Version/s: 6.2.1

Type: Bug Priority: Major
Reporter: Kyle Joiner (Inactive) Assignee: Niclas Antti
Resolution: Fixed Votes: 1
Labels: None

Sprint: MXS-SPRINT-145, MXS-SPRINT-146

 Description   

When using the KafkaCDC router pointed to a Server in Maxscale using MariaDB monitor errors occur when starting the Kafka router on a verified GTID location:

Kafka: FindCoordinator response error: Group authorization failed.



 Comments   
Comment by markus makela [ 2021-10-07 ]

Does this occur if authentication is not enabled? The error is from Kafka which means it has nothing to do with the binlogrouter and suggests a problem with how the Kafka cluster authenticates MaxScale.

Comment by Kyle Joiner (Inactive) [ 2021-10-11 ]

When pointing the Kafka router directly at the Galera cluster nodes there is no error so it does not seem to be an authentication problem.

Comment by Naresh Chandra [ 2021-11-03 ]

When pointing the Kafka router directly at the Galera cluster nodes there was no error but with same credentials if we pointing the Kafka router from Binlog router then its not working.

CASE1: When we use only KafkaCDC without Binlog router

  • Here, KafkaCDC directly replicating from Galera cluster and able to push the data changes to Kafka broker.

CASE2: When we use only KafkaCDC with Binlog router

  • Here, Binlog router directly replicating from Galera cluster and KafkaCDC router is replicating/reading (Indirectly from Galera cluster) from Binlog router and KafkaCDC router should be able to push the data changes to Kafka broker but its not happening.

Both the CASE1 and CASE2, Kafka broker is common, so the issue is not with Kafkabroker or KafkaCDC router, issue is between KafkaCDC and Binlog router.

Comment by Naresh Chandra [ 2021-11-19 ]

Can we fix this issue in the next release?

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