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Chapter 11. Known issues
This section lists the known issues for Streams for Apache Kafka 2.9 on OpenShift.
11.1. Multi-Version upgrades from the OperatorHub LTS channel
Currently, multi-version upgrades between Long Term Support (LTS) versions are not supported through the Operator Lifecycle Manager (OLM) when using the OperatorHub LTS channel.
For example, you cannot directly upgrade from version 2.2 LTS to version 2.9 LTS. Instead, you must perform incremental upgrades, stepping through each intermediate minor version to reach version 2.9.
11.2. Cruise Control CPU utilization estimation
Cruise Control for Streams for Apache Kafka has a known issue that relates to the calculation of CPU utilization estimation. CPU utilization is calculated as a percentage of the defined capacity of a broker pod. The issue occurs when running Kafka brokers across nodes with varying CPU cores. For example, node1 might have 2 CPU cores and node2 might have 4 CPU cores. In this situation, Cruise Control can underestimate and overestimate CPU load of brokers The issue can prevent cluster rebalances when the pod is under heavy load.
There are two workarounds for this issue.
Workaround one: Equal CPU requests and limits
You can set CPU requests equal to CPU limits in Kafka.spec.kafka.resources. That way, all CPU resources are reserved upfront and are always available. This configuration allows Cruise Control to properly evaluate the CPU utilization when preparing the rebalance proposals based on CPU goals.
Workaround two: Exclude CPU goals
You can exclude CPU goals from the hard and default goals specified in the Cruise Control configuration.
Example Cruise Control configuration without CPU goals
For more information, see Insufficient CPU capacity.
11.3. JMX authentication when running in FIPS mode
When running Streams for Apache Kafka in FIPS mode with JMX authentication enabled, clients may fail authentication. To work around this issue, do not enable JMX authentication while running in FIPS mode. We are investigating the issue and working to resolve it in a future release.
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