add ability to use separate disk for zookeeper tx log (#476)

* add ability to use separate disk for zookeeper tx log

* Use absolute path

---------

Co-authored-by: Lari Hotari <lhotari@users.noreply.github.com>

charts/pulsar/templates/zookeeper-configmap.yaml

@@ -29,6 +29,9 @@ metadata:
     component: {{ .Values.zookeeper.component }}
 data:
   dataDir: /pulsar/data/zookeeper
+  {{- if .Values.zookeeper.volumes.useSeparateDiskForTxlog }}
+  PULSAR_PREFIX_dataLogDir: /pulsar/data-log
+  {{- end }}
   {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
   # enable zookeeper tls
   PULSAR_PREFIX_serverCnxnFactory: org.apache.zookeeper.server.NettyServerCnxnFactory

charts/pulsar/templates/zookeeper-statefulset.yaml

@@ -209,6 +209,10 @@ spec:
         volumeMounts:
         - name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.data.name }}"
           mountPath: /pulsar/data
+        {{- if .Values.zookeeper.volumes.useSeparateDiskForTxlog }}
+        - name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.datalog.name }}"
+          mountPath: /pulsar/data-log
+        {{- end }}
         {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
         - mountPath: "/pulsar/certs/zookeeper"
           name: zookeeper-certs
@@ -272,5 +276,25 @@ spec:
       selector:
         {{- toYaml . | nindent 8 }}
     {{- end }}
+  {{- if .Values.zookeeper.volumes.useSeparateDiskForTxlog }}
+  - metadata:
+      name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.datalog.name }}"
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      resources:
+        requests:
+          storage: {{ .Values.zookeeper.volumes.datalog.size }}
+    {{- if .Values.zookeeper.volumes.datalog.storageClassName }}
+      storageClassName: "{{ .Values.zookeeper.volumes.datalog.storageClassName }}"
+    {{- else if and (not (and .Values.volumes.local_storage .Values.zookeeper.volumes.datalog.local_storage)) .Values.zookeeper.volumes.datalog.storageClass }}
+      storageClassName: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.datalog.name }}"
+    {{- else if and .Values.volumes.local_storage .Values.zookeeper.volumes.datalog.local_storage }}
+      storageClassName: "local-storage"
+    {{- end }}
+    {{- with .Values.zookeeper.volumes.datalog.selector }}
+      selector:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+  {{- end }}
 {{- end }}
 {{- end }}

charts/pulsar/values.yaml

@@ -352,6 +352,7 @@ zookeeper:
     fsGroup: 0
     fsGroupChangePolicy: "OnRootMismatch"
   volumes:
+    useSeparateDiskForTxlog: false
     # use a persistent volume or emptyDir
     persistence: true
     data:
@@ -374,6 +375,27 @@ zookeeper:
         # matchLabels:
         # app: pulsar-zookeeper
       selector: {}
+    ## If you set useSeparateDiskForTxlog to true, this section configures the extra volume for the zookeeper transaction log.
+    datalog:
+      name: datalog
+      size: 20Gi
+      local_storage: true
+      ## If you already have an existent storage class and want to reuse it, you can specify its name with the option below
+      ##
+      # storageClassName: existent-storage-class
+      #
+      ## Instead if you want to create a new storage class define it below
+      ## If left undefined no storage class will be defined along with PVC
+      ##
+      # storageClass:
+        # type: pd-ssd
+        # fsType: xfs
+        # provisioner: kubernetes.io/gce-pd
+      ## If you want to bind static persistent volumes via selectors, e.g.:
+      # selector:
+        # matchLabels:
+        # app: pulsar-zookeeper
+      selector: {}
   # External zookeeper server list in case of global-zk list to create zk cluster across zk deployed on different clusters/namespaces
   # Example value: "us-east1-pulsar-zookeeper-0.us-east1-pulsar-zookeeper.us-east1.svc.cluster.local:2888:3888,us-east1-pulsar-zookeeper-1.us-east1-pulsar-zookeeper.us-east1.svc.cluster.local:2888:3888,us-east1-pulsar-zookeeper-2.us-east1-pulsar-zookeeper.us-east1.svc.cluster.local:2888:3888,us-west1-pulsar-zookeeper-0.us-west1-pulsar-zookeeper.us-west1.svc.cluster.local:2888:3888,us-west1-pulsar-zookeeper-1.us-west1-pulsar-zookeeper.us-west1.svc.cluster.local:2888:3888,us-west1-pulsar-zookeeper-2.us-west1-pulsar-zookeeper.us-west1.svc.cluster.local:2888:3888"
   externalZookeeperServerList: ""