Patchers

Patchers can be seen as functions which take a value as input and modify a Kubernetes resource in a patcher-specific way.

Available Patchers

• ReplicaPatcher: Modifies the number of replicas for a Kubernetes deployment.
  • type: “ReplicaPatcher”
  • resource: “uc1-kstreams-deployment.yaml”
• NumSensorsLoadGeneratorReplicaPatcher: Modifies the number of load generators, according to the following formula: (value + loadGenMaxRecords - 1) / loadGenMaxRecords
  • type: “NumSensorsLoadGeneratorReplicaPatcher”
  • resource: “uc1-load-generator-deployment.yaml”
  • properties:
    • loadGenMaxRecords: 150000
• NumNestedGroupsLoadGeneratorReplicaPatcher: Modifies the number of load generators, according to the following formula: (4^(value) + loadGenMaxRecords - 1) / loadGenMaxRecords
  • type: “NumNestedGroupsLoadGeneratorReplicaPatcher”
  • resource: “uc1-load-generator-deployment.yaml”
  • properties:
    • loadGenMaxRecords: 150000
• DataVolumeLoadGeneratorReplicaPatcher: Takes the total load that should be generated and computes the number of instances needed for this load based on the maxVolume ((load + maxVolume - 1) / maxVolume) and calculates the load per instance (loadPerInstance = load / instances). The number of instances are set for the load generator and the given variable is set to the load per instance.
  • type: “DataVolumeLoadGeneratorReplicaPatcher”
  • resource: “osp-load-generator-deployment.yaml”
  • properties:
    • maxVolume: “50”
    • container: “workload-generator”
    • variableName: “DATA_VOLUME”
• ReplicaPatcher: Allows to modify the number of Replicas for a kubernetes deployment.
  • type: “ReplicaPatcher”
  • resource: “uc1-kstreams-deployment.yaml”
• EnvVarPatcher: Modifies the value of an environment variable for a container in a Kubernetes deployment.
  • type: “EnvVarPatcher”
  • resource: “uc1-load-generator-deployment.yaml”
  • properties:
    • container: “workload-generator”
    • variableName: “NUM_SENSORS”
• ConfigMapYamlPatcher: allows to add/modify a key-value pair in a YAML file of a ConfigMap
  • type: “ConfigMapYamlPatcher”
  • resource: “flink-configuration-configmap.yaml”
  • properties:
    • fileName: “flink-conf.yaml”
    • variableName: “jobmanager.memory.process.size”
  • value: “4Gb”
• NodeSelectorPatcher: Changes the node selection field in Kubernetes resources.
  • type: “NodeSelectorPatcher”
  • resource: “uc1-load-generator-deployment.yaml”
  • properties:
    • variableName: “env”
  • example value: “prod”
• ResourceLimitPatcher: Changes the resource limit for a Kubernetes resource.
  • resource: “uc1-kstreams-deployment.yaml”
  • properties:
    • container: “uc-application”
    • variableName: “cpu” or “memory”
  • example value:”1000m” or “2Gi”
• SchedulerNamePatcher: Changes the scheduler for Kubernetes resources.
  • type: “SchedulerNamePatcher”
  • resource: “uc1-kstreams-deployment.yaml”
  • example value: “random-scheduler”
• LabelPatcher: Changes the label of a Kubernetes Deployment or StatefulSet. The patched field is: metadata.labels
  • type: “LabelPatcher”
  • resource: “uc1-kstreams-deployment.yaml”
  • properties:
    • variableName: “app”
  • example value: “theodolite-sut”
• MatchLabelPatcher: Changes the match labels of a Kubernetes Deployment or StatefulSet. The patched field is: spec.selector.matchLabels
  • type: “MatchLabelPatcher”
  • resource: “uc1-kstreams-deployment.yaml”
  • properties:
    • variableName: “app”
  • example value: “theodolite-sut”
• TemplateLabelPatcher: Changes the template labels of a Kubernetes Deployment or StatefulSet. The patched field is: spec.template.metadata.labels
  • type: “MatchLabelPatcher”
  • resource: “uc1-kstreams-deployment.yaml”
  • properties:
    • variableName: “app”
  • example value: “theodolite-sut”
• ImagePatcher: Changes the image of a Kubernetes resource. Currently not fully implemented.
  • type: “ImagePatcher”
  • resource: “uc1-kstreams-deployment.yaml”
  • properties:
    • container: “uc-application”
  • example value: “dockerhub-org/image-name”