## As weighted quorums are not supported, it is imperative that an odd number of replicas
## be chosen. Moreover, the number of replicas should be either 1, 3, 5, or 7.
##
## ref: https://github.com/kubernetes/contrib/tree/master/statefulsets/zookeeper#stateful-set
replicaCount: 3  # Desired quantity of ZooKeeper pods. This should always be (1,3,5, or 7)

podDisruptionBudget:
  maxUnavailable: 1  # Limits how many Zokeeper pods may be unavailable due to voluntary disruptions.

terminationGracePeriodSeconds: 1800  # Duration in seconds a Zokeeper pod needs to terminate gracefully.

updateStrategy:
  type: RollingUpdate

## refs:
## - https://github.com/kubernetes/contrib/tree/master/statefulsets/zookeeper
## - https://github.com/kubernetes/contrib/blob/master/statefulsets/zookeeper/Makefile#L1
image:
  repository: zookeeper     # Container image repository for zookeeper container.
  tag: 3.7.1                # Container image tag for zookeeper container.
  pullPolicy: IfNotPresent  # Image pull criteria for zookeeper container.

service:
  type: ClusterIP  # Exposes zookeeper on a cluster-internal IP.
  annotations: {}  # Arbitrary non-identifying metadata for zookeeper service.
    ## AWS example for use with LoadBalancer service type.
    # external-dns.alpha.kubernetes.io/hostname: zookeeper.cluster.local
    # service.beta.kubernetes.io/aws-load-balancer-cross-zone-load-balancing-enabled: "true"
    # service.beta.kubernetes.io/aws-load-balancer-internal: "true"
  ports:
    client:
      port: 2281  # Service port number for client port.
      targetPort: client  # Service target port for client port.
      protocol: TCP  # Service port protocol for client port.

## Headless service.
##
headless:
  annotations: {}
  # publishNotReadyAddresses, default false for backward compatibility
  # set to true to register DNS entries for unready pods, which helps in rare
  # occasions when cluster is unable to be created, DNS caching is enforced
  # or pods are in persistent crash loop
  publishNotReadyAddresses: true

ports:
  client:
    containerPort: 2281  # Port number for zookeeper container client port.
    protocol: TCP  # Protocol for zookeeper container client port.
  election:
    containerPort: 3888  # Port number for zookeeper container election port.
    protocol: TCP  # Protocol for zookeeper container election port.
  server:
    containerPort: 2888  # Port number for zookeeper container server port.
    protocol: TCP  # Protocol for zookeeper container server port.

resources: {}  # Optionally specify how much CPU and memory (RAM) each zookeeper container needs.
  # We usually recommend not to specify default resources and to leave this as a conscious
  # choice for the user. This also increases chances charts run on environments with little
  # resources, such as Minikube. If you do want to specify resources, uncomment the following
  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
  # limits:
  #  cpu: 100m
  #  memory: 128Mi
  # requests:
  #  cpu: 100m
  #  memory: 128Mi

priorityClassName: ""

nodeSelector: {}  # Node label-values required to run zookeeper pods.

tolerations: []  # Node taint overrides for zookeeper pods.

affinity: {}  # Criteria by which pod label-values influence scheduling for zookeeper pods.
  # podAntiAffinity:
  #   requiredDuringSchedulingIgnoredDuringExecution:
  #     - topologyKey: "kubernetes.io/hostname"
  #       labelSelector:
  #         matchLabels:
  #           release: zookeeper

podAnnotations: {}  # Arbitrary non-identifying metadata for zookeeper pods.
  # prometheus.io/scrape: "true"
  # prometheus.io/path: "/metrics"
  # prometheus.io/port: "9141"

podLabels: {}  # Key/value pairs that are attached to zookeeper pods.
  # team: "developers"
  # service: "zookeeper"

securityContext:
  fsGroup: 1000
  runAsUser: 1000

## Useful, if you want to use an alternate image.
command:
  - /bin/bash
  - -xec
  - /config-scripts/run

## If you want the quorum to use SSL internally, create a
## kubernetes.io/tls object (cert-manager produces these), and ensure
## that it has a SAN entry for each of the server hostnames (e.g.:
## zookeeper-0.zookeeper-headless.namespace.svc.cluster.local).
## Supply the name of the object here:
serverTlsSecret: "zookeeper-server-tls"

## To use client SSL, create a kubernetes.io/tls object (cert-manager
## produces these), and supply the name here.  If this is provided,
## then plain-text client connections are disabled.  The same secret
## may be used for both client and server connections.
clientTlsSecret: "zookeeper-server-tls"

## Useful if using any custom authorizer.
## Pass any secrets to the kafka pods. Each secret will be passed as an
## environment variable by default. The secret can also be mounted to a
## specific path (in addition to environment variable) if required. Environment
## variable names are generated as: `<secretName>_<secretKey>` (All upper case)
# secrets:
# - name: myKafkaSecret
#   keys:
#     - username
#     - password
#   # mountPath: /opt/kafka/secret
# - name: myZkSecret
#   keys:
#     - user
#     - pass
#   mountPath: /opt/zookeeper/secret

persistence:
  enabled: true
  ## zookeeper data Persistent Volume Storage Class
  ## If defined, storageClassName: <storageClass>
  ## If set to "-", storageClassName: "", which disables dynamic provisioning
  ## If undefined (the default) or set to null, no storageClassName spec is
  ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
  ##   GKE, AWS & OpenStack)
  ##
  # storageClass: "-"
  accessMode: ReadWriteOnce
  size: 5Gi

## Exporters query apps for metrics and make those metrics available for
## Prometheus to scrape.
exporters:

  jmx:
    enabled: false
    image:
      repository: sscaling/jmx-prometheus-exporter
      tag: 0.3.0
      pullPolicy: IfNotPresent
    config:
      lowercaseOutputName: false
      ## ref: https://github.com/prometheus/jmx_exporter/blob/master/example_configs/zookeeper.yaml
      rules:
        - pattern: "org.apache.ZooKeeperService<name0=ReplicatedServer_id(\\d+)><>(\\w+)"
          name: "zookeeper_$2"
        - pattern: "org.apache.ZooKeeperService<name0=ReplicatedServer_id(\\d+), name1=replica.(\\d+)><>(\\w+)"
          name: "zookeeper_$3"
          labels:
            replicaId: "$2"
        - pattern: "org.apache.ZooKeeperService<name0=ReplicatedServer_id(\\d+), name1=replica.(\\d+), name2=(\\w+)><>(\\w+)"
          name: "zookeeper_$4"
          labels:
            replicaId: "$2"
            memberType: "$3"
        - pattern: "org.apache.ZooKeeperService<name0=ReplicatedServer_id(\\d+), name1=replica.(\\d+), name2=(\\w+), name3=(\\w+)><>(\\w+)"
          name: "zookeeper_$4_$5"
          labels:
            replicaId: "$2"
            memberType: "$3"
      startDelaySeconds: 30
    env: {}
    resources: {}
    path: /metrics
    ports:
      jmxxp:
        containerPort: 9404
        protocol: TCP
    livenessProbe:
      httpGet:
        path: /metrics
        port: jmxxp
      initialDelaySeconds: 30
      periodSeconds: 15
      timeoutSeconds: 60
      failureThreshold: 8
      successThreshold: 1
    readinessProbe:
      httpGet:
        path: /metrics
        port: jmxxp
      initialDelaySeconds: 30
      periodSeconds: 15
      timeoutSeconds: 60
      failureThreshold: 8
      successThreshold: 1
    serviceMonitor:
      interval: 30s
      scrapeTimeout: 30s
      scheme: http

  zookeeper:
  ## refs:
  ## - https://github.com/carlpett/zookeeper_exporter
  ## - https://hub.docker.com/r/josdotso/zookeeper-exporter/
  ## - https://www.datadoghq.com/blog/monitoring-kafka-performance-metrics/#zookeeper-metrics
    enabled: false
    image:
      repository: josdotso/zookeeper-exporter
      tag: v1.1.2
      pullPolicy: IfNotPresent
    config:
      logLevel: info
      resetOnScrape: "true"
    env: {}
    resources: {}
    path: /metrics
    ports:
      zookeeperxp:
        containerPort: 9141
        protocol: TCP
    livenessProbe:
      httpGet:
        path: /metrics
        port: zookeeperxp
      initialDelaySeconds: 30
      periodSeconds: 15
      timeoutSeconds: 60
      failureThreshold: 8
      successThreshold: 1
    readinessProbe:
      httpGet:
        path: /metrics
        port: zookeeperxp
      initialDelaySeconds: 30
      periodSeconds: 15
      timeoutSeconds: 60
      failureThreshold: 8
      successThreshold: 1
    serviceMonitor:
      interval: 30s
      scrapeTimeout: 30s
      scheme: http

## ServiceMonitor configuration in case you are using Prometheus Operator
prometheus:
  serviceMonitor:
    ## If true a ServiceMonitor for each enabled exporter will be installed
    enabled: false
    ## The namespace where the ServiceMonitor(s) will be installed
    # namespace: monitoring
    ## The selector the Prometheus instance is searching for
    ## [Default Prometheus Operator selector] (https://github.com/helm/charts/blob/f5a751f174263971fafd21eee4e35416d6612a3d/stable/prometheus-operator/templates/prometheus/prometheus.yaml#L74)
    selector: {}

## Use an alternate scheduler, e.g. "stork".
## ref: https://kubernetes.io/docs/tasks/administer-cluster/configure-multiple-schedulers/
##
# schedulerName:

## ref: https://github.com/kubernetes/contrib/tree/master/statefulsets/zookeeper
env:

  ## Options related to JMX exporter.
  ## ref: https://github.com/apache/zookeeper/blob/master/bin/zkServer.sh#L36
  JMXAUTH: "false"
  JMXDISABLE: "false"
  JMXPORT: 1099
  JMXSSL: "false"

  ## The port on which the server will accept client requests.
  ZOO_PORT: 2181

  ## The number of Ticks that an ensemble member is allowed to perform leader
  ## election.
  ZOO_INIT_LIMIT: 5

  ZOO_TICK_TIME: 2000

  ## The maximum number of concurrent client connections that
  ## a server in the ensemble will accept.
  ZOO_MAX_CLIENT_CNXNS: 60

  ## The number of Tick by which a follower may lag behind the ensembles leader.
  ZK_SYNC_LIMIT: 10

  ## The number of wall clock ms that corresponds to a Tick for the ensembles
  ## internal time.
  ZK_TICK_TIME: 2000

  ZOO_AUTOPURGE_PURGEINTERVAL: 6
  ZOO_AUTOPURGE_SNAPRETAINCOUNT: 3
  ZOO_STANDALONE_ENABLED: false

jobs:
  ## ref: http://zookeeper.apache.org/doc/r3.4.10/zookeeperProgrammers.html#ch_zkSessions
  chroots:
    enabled: false
    activeDeadlineSeconds: 300
    backoffLimit: 5
    completions: 1
    config:
      create: []
        # - /kafka
        # - /ureplicator
    env: []
    parallelism: 1
    resources: {}
    restartPolicy: Never