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Chapter 8. Known issues

This section lists the known issues for AMQ Streams 2.4 on OpenShift.

If Cross-Origin Resource Sharing (CORS) is enabled for the Kafka Bridge, a 400 bad request error is returned when sending a HTTP request to produce messages.

Workaround

To avoid this error, disable CORS in the Kafka Bridge configuration. HTTP requests to produce messages must have CORS disabled in the Kafka Bridge. This issue will be fixed in a future release of AMQ Streams.

To use CORS, you can deploy Red Hat 3scale for the Kafka Bridge.

8.2. AMQ Streams Cluster Operator on IPv6 clusters
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The AMQ Streams Cluster Operator does not start on Internet Protocol version 6 (IPv6) clusters.

Workaround

There are two workarounds for this issue.

Workaround one: Set the KUBERNETES_MASTER environment variable

  1. Display the address of the Kubernetes master node of your OpenShift Container Platform cluster: 

    oc cluster-info
Kubernetes master is running at <master_address>
# ...
    Copy to Clipboard Toggle word wrap

    Copy the address of the master node.

  2. List all Operator subscriptions: 

    oc get subs -n <operator_namespace>
    Copy to Clipboard Toggle word wrap

  3. Edit the Subscription resource for AMQ Streams: 

    oc edit sub amq-streams -n <operator_namespace>
    Copy to Clipboard Toggle word wrap

  4. In spec.config.env, add the KUBERNETES_MASTER environment variable, set to the address of the Kubernetes master node. For example: 

    apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: amq-streams
  namespace: <operator_namespace>
spec:
  channel: amq-streams-1.8.x
  installPlanApproval: Automatic
  name: amq-streams
  source: mirror-amq-streams
  sourceNamespace: openshift-marketplace
  config:
    env:
    - name: KUBERNETES_MASTER
      value: MASTER-ADDRESS
    Copy to Clipboard Toggle word wrap
  5. Save and exit the editor.

  6. Check that the Subscription was updated: 

    oc get sub amq-streams -n <operator_namespace>
    Copy to Clipboard Toggle word wrap

  7. Check that the Cluster Operator Deployment was updated to use the new environment variable: 

    oc get deployment <cluster_operator_deployment_name>
    Copy to Clipboard Toggle word wrap

Workaround two: Disable hostname verification

  1. List all Operator subscriptions: 

    oc get subs -n <operator_namespace>
    Copy to Clipboard Toggle word wrap

  2. Edit the Subscription resource for AMQ Streams: 

    oc edit sub amq-streams -n <operator_namespace>
    Copy to Clipboard Toggle word wrap

  3. In spec.config.env, add the KUBERNETES_DISABLE_HOSTNAME_VERIFICATION environment variable, set to true. For example: 

    apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: amq-streams
  namespace: <operator_namespace>
spec:
  channel: amq-streams-1.8.x
  installPlanApproval: Automatic
  name: amq-streams
  source: mirror-amq-streams
  sourceNamespace: openshift-marketplace
  config:
    env:
    - name: KUBERNETES_DISABLE_HOSTNAME_VERIFICATION
      value: "true"
    Copy to Clipboard Toggle word wrap
  4. Save and exit the editor.

  5. Check that the Subscription was updated: 

    oc get sub amq-streams -n <operator_namespace>
    Copy to Clipboard Toggle word wrap

  6. Check that the Cluster Operator Deployment was updated to use the new environment variable: 

    oc get deployment <cluster_operator_deployment_name>
    Copy to Clipboard Toggle word wrap

8.3. Cruise Control CPU utilization estimation
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Cruise Control for AMQ Streams 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

apiVersion: kafka.strimzi.io/v1beta2
kind: Kafka
metadata:
  name: my-cluster
spec:
  kafka:
    # ...
  zookeeper:
    # ...
  entityOperator:
    topicOperator: {}
    userOperator: {}
  cruiseControl:
    brokerCapacity:
      inboundNetwork: 10000KB/s
      outboundNetwork: 10000KB/s
    config:
      hard.goals: >
        com.linkedin.kafka.cruisecontrol.analyzer.goals.RackAwareGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.MinTopicLeadersPerBrokerGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.ReplicaCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.DiskCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkInboundCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkOutboundCapacityGoal
      default.goals: >
        com.linkedin.kafka.cruisecontrol.analyzer.goals.RackAwareGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.MinTopicLeadersPerBrokerGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.ReplicaCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.DiskCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkInboundCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkOutboundCapacityGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.ReplicaDistributionGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.PotentialNwOutGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.DiskUsageDistributionGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkInboundUsageDistributionGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkOutboundUsageDistributionGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.TopicReplicaDistributionGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.LeaderReplicaDistributionGoal,
        com.linkedin.kafka.cruisecontrol.analyzer.goals.LeaderBytesInDistributionGoal
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For more information, see Insufficient CPU capacity.

8.4. User Operator scalability
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The User Operator can timeout when creating multiple users at the same time. Reconciliation can take too long.

Workaround

If you encounter this issue, reduce the number of users you are creating at the same time. And wait until they are ready before creating more users.

8.5. JMX authentication when running in FIPS mode
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When running AMQ Streams 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.

If you enable OAuth 2.0 metrics using the enableMetrics property, Cruise Control fails with an exception. To be able to use Cruise Control, you must not configure the enableMetrics property or set it to false. We are investigating the issue and working to resolve it in a future release.

Track this issue: ENTMQST-4735.

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