feat(chart): Configure fixed-sized thread pool for the Distributor in…

… autoscaling Configure fixed-sized thread pool for the Distributor to create new sessions based on sum of maxReplicaCount of all enabled Nodes in autoscaling Signed-off-by: Viet Nguyen Duc <nguyenducviet4496@gmail.com>
SeleniumHQ · Mar 27, 2024 · 2eca4bb · 2eca4bb
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Showing 13 changed files with 86 additions and 27 deletions.
diff --git a/.github/workflows/helm-chart-test.yml b/.github/workflows/helm-chart-test.yml
@@ -15,6 +15,10 @@ on:
         description: 'Test parameter for different request timeout'
         required: false
         default: '370'
+      max-replicas-count:
+        description: 'Test parameter for autoscaling to set maxReplicaCount'
+        required: false
+        default: '30'
       log-level:
         description: 'Test parameter for different log level'
         required: false
@@ -116,8 +120,11 @@ jobs:
         if: (matrix.test-strategy == 'job' || matrix.test-strategy == 'deployment') && (github.event_name == 'schedule' || github.event_name == 'workflow_dispatch')
         run: |
           echo "AUTOSCALING_POLL_INTERVAL=${AUTOSCALING_POLL_INTERVAL}" >> $GITHUB_ENV
+          echo "SET_MAX_REPLICAS=${SET_MAX_REPLICAS}" >> $GITHUB_ENV
+          echo "LOG_LEVEL=${LOG_LEVEL}" >> $GITHUB_ENV
         env:
           AUTOSCALING_POLL_INTERVAL: ${{ github.event.inputs.request-timeout || '370' }}
+          SET_MAX_REPLICAS: ${{ github.event.inputs.max-replicas-count || '30' }}
           LOG_LEVEL: ${{ github.event.inputs.log-level || 'FINE' }}
       - name: Test Selenium Grid on Kubernetes ${{ matrix.k8s-version }} with Autoscaling ${{ matrix.test-strategy }}
         uses: nick-invision/retry@master

diff --git a/charts/selenium-grid/README.md b/charts/selenium-grid/README.md
@@ -14,6 +14,7 @@ This chart enables the creation of a Selenium Grid Server in Kubernetes.
     * [Settings common for both `job` and `deployment` scalingType](#settings-common-for-both-job-and-deployment-scalingtype)
     * [Settings when scalingType with `deployment`](#settings-when-scalingtype-with-deployment-)
     * [Settings when scalingType with `job`](#settings-when-scalingtype-with-job)
+    * [Settings fixed-sized thread pool for the Distributor to create new sessions](#settings-fixed-sized-thread-pool-for-the-distributor-to-create-new-sessions)
   * [Updating Selenium-Grid release](#updating-selenium-grid-release)
   * [Uninstalling Selenium Grid release](#uninstalling-selenium-grid-release)
   * [Ingress Configuration](#ingress-configuration)
@@ -195,6 +196,16 @@ autoscaling:
 
 Settings that KEDA [ScaledJob spec](https://keda.sh/docs/latest/concepts/scaling-jobs/#scaledjob-spec) supports can be set via `autoscaling.scaledJobOptions`.
 
+### Settings fixed-sized thread pool for the Distributor to create new sessions
+
+When enabling autoscaling, the Distributor might be under a high workload with parallelism tests, which are many requests incoming and nodes scaling up simultaneously. (Refer to: [SeleniumHQ/selenium#13723](https://github.com/SeleniumHQ/selenium/issues/13723)).
+
+By default, the Distributor uses a fixed-sized thread pool with default value is `no. of available processors * 3`.
+
+In autoscaling, by default, it will calculate based on `no. of node types * maxReplicaCount`. For example: `autoscaling.scaledOptions.maxReplicaCount=50`, 3 node types (`Chrome, Firefox, Edge` enabled), the value is `50 * 3 + 1 = 151` is set to environment variable `SE_NEW_SESSION_THREAD_POOL_SIZE` to adjust the Distributor config `--newsession-threadpool-size`
+
+You can override the default calculation by another value via `components.distributor.newSessionThreadPoolSize` (in full distributed mode) or `hub.newSessionThreadPoolSize` (in basic mode).
+
 ## Updating Selenium-Grid release
 
 Once you have a new chart version, you can update your selenium-grid running:

diff --git a/charts/selenium-grid/templates/_helpers.tpl b/charts/selenium-grid/templates/_helpers.tpl
@@ -127,6 +127,27 @@ Is tracing enabled
 {{- or .Values.tracing.enabled .Values.tracing.enabledWithExistingEndpoint | ternary "true" "" -}}
 {{- end -}}
 
+{{/*
+Configure fixed-sized thread pool for the Distributor to create new sessions
+based on sum of maxReplicaCount of all enabled Nodes in autoscaling
+*/}}
+{{- define "seleniumGrid.autoscaling.distributor.threadPoolSize" -}}
+{{- $threadPoolSize := 1 -}}
+{{- if .Values.chromeNode.enabled -}}
+{{- $maxReplicaCount := default .Values.autoscaling.scaledOptions.maxReplicaCount (.Values.chromeNode.scaledOptions).maxReplicaCount -}}
+{{- $threadPoolSize = add $threadPoolSize $maxReplicaCount -}}
+{{- end -}}
+{{- if $.Values.firefoxNode.enabled -}}
+{{- $maxReplicaCount := default .Values.autoscaling.scaledOptions.maxReplicaCount (.Values.firefoxNode.scaledOptions).maxReplicaCount -}}
+{{- $threadPoolSize = add $threadPoolSize $maxReplicaCount -}}
+{{- end -}}
+{{- if $.Values.edgeNode.enabled -}}
+{{- $maxReplicaCount := default .Values.autoscaling.scaledOptions.maxReplicaCount (.Values.edgeNode.scaledOptions).maxReplicaCount -}}
+{{- $threadPoolSize = add $threadPoolSize $maxReplicaCount -}}
+{{- end -}}
+{{- $threadPoolSize -}}
+{{- end -}}
+
 {{/*
 Common autoscaling spec template
 */}}

diff --git a/charts/selenium-grid/templates/distributor-deployment.yaml b/charts/selenium-grid/templates/distributor-deployment.yaml
@@ -52,9 +52,12 @@ spec:
               value: '{{ template "seleniumGrid.sessionQueue.fullname" . }}.{{ .Release.Namespace }}'
             - name: SE_SESSION_QUEUE_PORT
               value: {{ .Values.components.sessionQueue.port | quote }}
-            {{- with .Values.components.distributor.newSessionThreadPoolSize }}
+            {{- if .Values.components.distributor.newSessionThreadPoolSize }}
             - name: SE_NEW_SESSION_THREAD_POOL_SIZE
-              value: {{ . | quote }}
+              value: {{ .Values.components.distributor.newSessionThreadPoolSize | quote }}
+            {{- else if (eq (include "seleniumGrid.useKEDA" $) "true") }}
+            - name: SE_NEW_SESSION_THREAD_POOL_SIZE
+              value: '{{ template "seleniumGrid.autoscaling.distributor.threadPoolSize" $ }}'
             {{- end }}
           {{- with .Values.components.extraEnvironmentVariables }}
             {{- tpl (toYaml .) $ | nindent 12 }}

diff --git a/charts/selenium-grid/templates/hub-deployment.yaml b/charts/selenium-grid/templates/hub-deployment.yaml
@@ -109,9 +109,12 @@ spec:
             - name: SE_DISABLE_UI
               value: {{ .Values.hub.disableUI | quote }}
             {{- end }}
-            {{- with .Values.hub.newSessionThreadPoolSize }}
+            {{- if .Values.hub.newSessionThreadPoolSize }}
             - name: SE_NEW_SESSION_THREAD_POOL_SIZE
-              value: {{ . | quote }}
+              value: {{ .Values.hub.newSessionThreadPoolSize | quote }}
+            {{- else if (eq (include "seleniumGrid.useKEDA" $) "true") }}
+            - name: SE_NEW_SESSION_THREAD_POOL_SIZE
+              value: '{{ template "seleniumGrid.autoscaling.distributor.threadPoolSize" $ }}'
             {{- end }}
           {{- with .Values.hub.extraEnvironmentVariables }}
             {{- tpl (toYaml .) $ | nindent 12 }}

diff --git a/charts/selenium-grid/values.yaml b/charts/selenium-grid/values.yaml
@@ -722,7 +722,7 @@ chromeNode:
     url: '{{ template "seleniumGrid.graphqlURL" . }}'
     browserName: 'chrome'
     sessionBrowserName: 'chrome'
-    platformName: 'Linux'
+    platformName: 'linux'
     # browserVersion: '91.0' # Optional. Only required when supporting multiple versions of browser in your Selenium Grid.
     unsafeSsl: '{{ template "seleniumGrid.graphqlURL.unsafeSsl" . }}'  # Optional
 
@@ -883,7 +883,7 @@ firefoxNode:
     url: '{{ template "seleniumGrid.graphqlURL" . }}'
     browserName: 'firefox'
     sessionBrowserName: 'firefox'
-    platformName: 'Linux'
+    platformName: 'linux'
     unsafeSsl: '{{ template "seleniumGrid.graphqlURL.unsafeSsl" . }}'  # Optional
 
   # It is used to add initContainers in the same pod of the browser node.
@@ -1042,7 +1042,7 @@ edgeNode:
     url: '{{ template "seleniumGrid.graphqlURL" . }}'
     browserName: 'MicrosoftEdge'
     sessionBrowserName: 'msedge'
-    platformName: 'Linux'
+    platformName: 'linux'
     unsafeSsl: '{{ template "seleniumGrid.graphqlURL.unsafeSsl" . }}'  # Optional
 
   # It is used to add initContainers in the same pod of the browser node.

diff --git a/tests/charts/ci/DeploymentAutoscaling-values.yaml b/tests/charts/ci/DeploymentAutoscaling-values.yaml
@@ -3,7 +3,7 @@ autoscaling:
   scaledOptions:
     minReplicaCount: 0
     maxReplicaCount: 3
-    pollingInterval: 20
+    pollingInterval: 10
   scaledObjectOptions:
     cooldownPeriod: 30
   terminationGracePeriodSeconds: 360

diff --git a/tests/charts/ci/JobAutoscaling-values.yaml b/tests/charts/ci/JobAutoscaling-values.yaml
@@ -7,8 +7,8 @@ autoscaling:
       strategy: default
   scaledOptions:
     minReplicaCount: 0
-    maxReplicaCount: 30
-    pollingInterval: 20
+    maxReplicaCount: 7
+    pollingInterval: 10
 # Configuration for chrome nodes
 chromeNode:
   nameOverride: my-chrome-name

diff --git a/tests/charts/ci/base-resources-values.yaml b/tests/charts/ci/base-resources-values.yaml
@@ -10,11 +10,11 @@ components:
   distributor:
     resources:
       requests:
-        cpu: 100m
-        memory: 256Mi
+        cpu: "1"
+        memory: 1Gi
       limits:
-        cpu: 200m
-        memory: 2500Mi
+        cpu: "2"
+        memory: 2Gi
   eventBus:
     resources:
       requests:
@@ -43,11 +43,11 @@ components:
 hub:
   resources:
     requests:
-      cpu: 100m
-      memory: 256Mi
+      cpu: "1"
+      memory: 1Gi
     limits:
-      cpu: 500m
-      memory: 2500Mi
+      cpu: "2"
+      memory: 2Gi
 
 chromeNode:
   resources:

diff --git a/tests/charts/make/chart_test.sh b/tests/charts/make/chart_test.sh
@@ -118,6 +118,15 @@ if [ "${CHART_ENABLE_INGRESS_HOSTNAME}" = "true" ]; then
   if [[ ! $(cat /etc/hosts) == *"${HOSTNAME_ADDRESS}"* ]]; then
     sudo -- sh -c -e "echo \"$(hostname -i) ${HOSTNAME_ADDRESS}\" >> /etc/hosts"
   fi
+  if [[ ! $(cat /etc/hosts) == *"alertmanager.${HOSTNAME_ADDRESS}"* ]]; then
+    sudo -- sh -c -e "echo \"$(hostname -i) alertmanager.${HOSTNAME_ADDRESS}\" >> /etc/hosts"
+  fi
+  if [[ ! $(cat /etc/hosts) == *"grafana.${HOSTNAME_ADDRESS}"* ]]; then
+    sudo -- sh -c -e "echo \"$(hostname -i) grafana.${HOSTNAME_ADDRESS}\" >> /etc/hosts"
+  fi
+  if [[ ! $(cat /etc/hosts) == *"pts.${HOSTNAME_ADDRESS}"* ]]; then
+    sudo -- sh -c -e "echo \"$(hostname -i) pts.${HOSTNAME_ADDRESS}\" >> /etc/hosts"
+  fi
   ping -c 2 ${HOSTNAME_ADDRESS}
   HELM_COMMAND_SET_IMAGES="${HELM_COMMAND_SET_IMAGES} \
   --set ingress.hostname=${HOSTNAME_ADDRESS} \
@@ -127,15 +136,6 @@ else
   HELM_COMMAND_SET_IMAGES="${HELM_COMMAND_SET_IMAGES} \
   --set global.K8S_PUBLIC_IP=${SELENIUM_GRID_HOST} \
   "
-  if [[ ! $(cat /etc/hosts) == *"alertmanager.selenium-grid.prod"* ]]; then
-    sudo -- sh -c -e "echo \"$(hostname -i) alertmanager.selenium-grid.prod\" >> /etc/hosts"
-  fi
-  if [[ ! $(cat /etc/hosts) == *"grafana.selenium-grid.prod"* ]]; then
-    sudo -- sh -c -e "echo \"$(hostname -i) grafana.selenium-grid.prod\" >> /etc/hosts"
-  fi
-  if [[ ! $(cat /etc/hosts) == *"pts.selenium-grid.prod"* ]]; then
-    sudo -- sh -c -e "echo \"$(hostname -i) pts.selenium-grid.prod\" >> /etc/hosts"
-  fi
 fi
 
 if [ "${CHART_ENABLE_BASIC_AUTH}" = "true" ]; then

diff --git a/tests/charts/templates/render/dummy.yaml b/tests/charts/templates/render/dummy.yaml
@@ -68,6 +68,7 @@ components:
       "restartOnUpdate": "true"
     serviceType: NodePort
   distributor:
+    newSessionThreadPoolSize: 24
     annotations:
       "restartOnUpdate": "true"
     serviceType: NodePort

diff --git a/tests/charts/templates/render/dummy_solution.yaml b/tests/charts/templates/render/dummy_solution.yaml
@@ -67,6 +67,7 @@ selenium-grid:
       disableUI: true
       serviceType: NodePort
     distributor:
+      newSessionThreadPoolSize: 24
       serviceType: NodePort
     eventBus:
       serviceType: NodePort

diff --git a/tests/charts/templates/test.py b/tests/charts/templates/test.py
@@ -73,6 +73,18 @@ def test_sub_path_set_to_grid_env_var(self):
                         is_present = True
         self.assertTrue(is_present, "ENV variable SE_SUB_PATH is not populated")
 
+    def test_distributor_new_session_thread_pool_size(self):
+        resources_name = ['{0}selenium-distributor'.format(RELEASE_NAME)]
+        is_present = False
+        for doc in LIST_OF_DOCUMENTS:
+            if doc['metadata']['name'] in resources_name and doc['kind'] == 'Deployment':
+                logger.info(f"Assert newSessionThreadPoolSize is set to Distributor env SE_NEW_SESSION_THREAD_POOL_SIZE")
+                list_env = doc['spec']['template']['spec']['containers'][0]['env']
+                for env in list_env:
+                    if env['name'] == 'SE_NEW_SESSION_THREAD_POOL_SIZE' and env['value'] == '24':
+                        is_present = True
+        self.assertTrue(is_present, "ENV variable SE_NEW_SESSION_THREAD_POOL_SIZE is not populated")
+
     def test_disable_ui_set_to_grid_env_var(self):
         resources_name = ['{0}selenium-router'.format(RELEASE_NAME)]
         is_present = False