# Copyright 2020 Crown Copyright
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: {{ template "hdfs.fullname" . }}-namenode
  labels:
    {{- include "hdfs.labels" . | nindent 4 }}
    app.kubernetes.io/component: namenode
spec:
  podManagementPolicy: Parallel
  replicas: 1
  serviceName: {{ template "hdfs.fullname" . }}-namenodes
  selector:
    matchLabels:
      {{- include "hdfs.selectorLabels" . | nindent 6 }}
      app.kubernetes.io/component: namenode
  volumeClaimTemplates:
{{- range $k, $v := until (int .Values.namenode.dataVolumes.count) }}
  - metadata:
      name: data{{$v}}
      labels:
        {{- include "hdfs.labels" $ | nindent 8 }}
    spec:
      {{- toYaml $.Values.namenode.dataVolumes.pvcTemplateSpec | nindent 6 }}
{{- end }}
  template:
    metadata:
      annotations:
        checksum/config: {{ include (print $.Template.BasePath "/config.yaml") . | sha256sum }}
        checksum/secrets: {{ include (print $.Template.BasePath "/secrets.yaml") . | sha256sum }}
      labels:
        {{- include "hdfs.labels" . | nindent 8 }}
        app.kubernetes.io/component: namenode
    spec:
      {{- if and .Values.config.rackAwareness .Values.config.rackAwareness.nodeTopologyLabel }}
      serviceAccountName: {{ template "hdfs.namenodeServiceAccountName" . }}
      {{- end }}
      containers:
      - name: namenode
        image: {{ .Values.namenode.repository }}:{{ .Values.namenode.tag }}
        imagePullPolicy: {{ .Values.namenode.imagePullPolicy }}
        args:
        - namenode
        env:
        - name: HADOOP_CONF_DIR
          value: {{ .Values.config.path }}
        {{- range $key, $value := .Values.namenode.extraEnvVars }}
        - name: {{ $key | upper | replace "." "_" }}
          value: {{ $value | quote }}
        {{- end }}
        volumeMounts:
        - name: temp-volume
          mountPath: /var/log/hadoop
        - name: config
          mountPath: {{ .Values.config.path }}
          readOnly: true
        - name: secrets
          mountPath: {{ .Values.secrets.path }}
          readOnly: true
        {{- if and .Values.config.rackAwareness .Values.config.rackAwareness.nodeTopologyLabel }}
        - name: rack-awareness
          mountPath: /scripts/resolve-rack.sh
          subPath: resolve-rack.sh
        {{- end }}
        {{- range $k, $v := until (int .Values.namenode.dataVolumes.count) }}
        - name: data{{$v}}
          mountPath: /data{{$v}}
        {{- end }}
        ports:
        - name: http
          containerPort: {{ .Values.namenode.ports.http }}
        - name: https
          containerPort: {{ .Values.namenode.ports.https }}
        - name: client-rpc
          containerPort: {{ .Values.namenode.ports.clientRpc }}
        - name: service-rpc
          containerPort: {{ .Values.namenode.ports.serviceRpc }}
        - name: lifeline-rpc
          containerPort: {{ .Values.namenode.ports.lifelineRpc }}
        livenessProbe:
          exec:
            command:
            - /bin/bash
            - -c
            - hdfs dfsadmin -fs hdfs://localhost -safemode get
          initialDelaySeconds: 30
          periodSeconds: 30
          timeoutSeconds: 30
          successThreshold: 1
          failureThreshold: 2
        resources:
          {{- toYaml .Values.namenode.resources | nindent 10 }}
      volumes:
      - name: temp-volume
        emptyDir: {}
      - name: config
        configMap:
          name: {{ template "hdfs.fullname" . }}
          optional: false
      - name: secrets
        secret:
          secretName: {{ template "hdfs.fullname" . }}
          optional: false
      {{- if .Values.config.rackAwareness }}
      {{- if .Values.config.rackAwareness.nodeTopologyLabel }}
      - name: rack-awareness
        configMap:
          name: {{ template "hdfs.fullname" . }}-rack-awareness
          defaultMode: 0755
      {{- end }}
      {{- end }}
      {{- with .Values.datanode.securityContext }}
      securityContext:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      {{- with .Values.namenode.affinity }}
      affinity:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      {{- with .Values.namenode.nodeSelector }}
      nodeSelector:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      {{- with .Values.namenode.tolerations }}
      tolerations:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      {{- with .Values.namenode.imagePullSecrets }}
      imagePullSecrets:
      {{- range . }}
      - name: {{ . }}
      {{- end }}
      {{- end }}