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  1. AMQ Streams
  2. ENTMQST-2099

When set to blank value for toleration Kafka cluster keeps rolling updates repeatedly

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Details

    • Bug
    • Resolution: Done
    • Major
    • 1.6.0.GA
    • 1.5.0.GA
    • cluster-operator
    • None
    • Hide
      • Although not entirely semantically the same, if the only key without value is used as a taint for nodes because it's rarely possible to mix a taint without value and with value, the "Exists" operation can be used instead of the "Equals" operation and blank string as below: 
        apiVersion: kafka.strimzi.io/v1beta1
kind: Kafka
spec:
  kafka:
    template:
      pod:
        tolerations:
          - effect: NoSchedule
            key: kafkarole
            operator: Exists
      Show
      Although not entirely semantically the same, if the only key without value is used as a taint for nodes because it's rarely possible to mix a taint without value and with value, the "Exists" operation can be used instead of the "Equals" operation and blank string as below: apiVersion: kafka.strimzi.io/v1beta1 kind: Kafka spec: kafka: template: pod: tolerations: - effect: NoSchedule key: kafkarole operator : Exists
      1. Set a blank value for toleration, please refer to the sample configuration(*1)
      2. (FYI, Reproduction is possible without using "taint" for nodes)
      3. ==> Kafka cluster keeps rolling updates repeatedly

    Description

      • When to set blank value for toleration(*1) Kafka cluster keeps rolling updates repeatedly.
      • The following debug log(*2) is output from the cluster operator. I guess, the Cluster Operator cannot distinguish between null and blank strings, and thus a diff is found repeatedly.

      (*1) toleration set to a blank value

      apiVersion: kafka.strimzi.io/v1beta1
kind: Kafka
spec:
  kafka:
    template:
      pod:
        tolerations:
          - effect: NoSchedule
            key: kafkarole
            operator: Equal 
            value: '' # HERE

      (*2) Cluster Operator debug log:

       strimzi-cluster-operator-b88dc78c5-h5z7j strimzi-cluster-operator 2020-06-30 06:34:01 DEBUG StatefulSetDiff:101 - StatefulSet p02690955/my-cluster-kafka differs:

{"op":"add","path":"/spec/template/spec/tolerations/0/value","value":""}

strimzi-cluster-operator-b88dc78c5-h5z7j strimzi-cluster-operator 2020-06-30 06:34:01 DEBUG StatefulSetDiff:102 - Current StatefulSet path /spec/template/spec/tolerations/0/value has value
 strimzi-cluster-operator-b88dc78c5-h5z7j strimzi-cluster-operator 2020-06-30 06:34:01 DEBUG StatefulSetDiff:103 - Desired StatefulSet path /spec/template/spec/tolerations/0/value has value ""

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            Unassigned Unassigned
            rhn-support-tyamashi Tomonari Yamashita
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              Updated:
              Resolved: