[elasticsearch] remove masterTerminationFix

This commit removes the `masterTerminationFix` side-car container
introduced in elastic#63 to fix slow elections issues when master node is
deleted. This workaround is no more needed since Elasticsearch 7.2.

Author: jmlrt

elasticsearch/README.md

@@ -135,7 +135,6 @@ support multiple versions with minimal changes.
 | `labels`                           | Configurable [labels][] applied to all Elasticsearch pods                                                                                                                                                                                                                                                         | `{}`                                             |
 | `lifecycle`                        | Allows you to add [lifecycle hooks][]. See [values.yaml][] for an example of the formatting                                                                                                                                                                                                                       | `{}`                                             |
 | `masterService`                    | The service name used to connect to the masters. You only need to set this if your master `nodeGroup` is set to something other than `master`. See [Clustering and Node Discovery][] for more information                                                                                                         | `""`                                             |
-| `masterTerminationFix`             | A workaround needed for Elasticsearch < 7.2 to prevent master status being lost during restarts [#63][]                                                                                                                                                                                                           | `false`                                          |
 | `maxUnavailable`                   | The [maxUnavailable][] value for the pod disruption budget. By default this will prevent Kubernetes from having more than 1 unhealthy pod in the node group                                                                                                                                                       | `1`                                              |
 | `minimumMasterNodes`               | The value for [discovery.zen.minimum_master_nodes][]. Should be set to `(master_eligible_nodes / 2) + 1`. Ignored in Elasticsearch versions >= 7                                                                                                                                                                  | `2`                                              |
 | `nameOverride`                     | Overrides the `clusterName` when used in the naming of resources                                                                                                                                                                                                                                                  | `""`                                             |

elasticsearch/templates/statefulset.yaml

@@ -362,64 +362,6 @@ spec:
 {{ toYaml .Values.extraVolumeMounts | indent 10 }}
         {{- end }}
         {{- end }}
-      {{- if .Values.masterTerminationFix }}
-      {{- if eq .Values.roles.master "true" }}
-      # This sidecar will prevent slow master re-election
-      # https://github.com/elastic/helm-charts/issues/63
-      - name: elasticsearch-master-graceful-termination-handler
-        image: "{{ .Values.image }}:{{ .Values.imageTag }}"
-        imagePullPolicy: "{{ .Values.imagePullPolicy }}"
-        command:
-        - "sh"
-        - -c
-        - |
-          #!/usr/bin/env bash
-          set -eo pipefail
-
-          http () {
-              local path="${1}"
-              if [ -n "${ELASTIC_USERNAME}" ] && [ -n "${ELASTIC_PASSWORD}" ]; then
-                BASIC_AUTH="-u ${ELASTIC_USERNAME}:${ELASTIC_PASSWORD}"
-              else
-                BASIC_AUTH=''
-              fi
-              curl -XGET -s -k --fail ${BASIC_AUTH} {{ .Values.protocol }}://{{ template "elasticsearch.masterService" . }}:{{ .Values.httpPort }}${path}
-          }
-
-          cleanup () {
-            while true ; do
-              local master="$(http "/_cat/master?h=node" || echo "")"
-              if [[ $master == "{{ template "elasticsearch.masterService" . }}"* && $master != "${NODE_NAME}" ]]; then
-                echo "This node is not master."
-                break
-              fi
-              echo "This node is still master, waiting gracefully for it to step down"
-              sleep 1
-            done
-
-            exit 0
-          }
-
-          trap cleanup SIGTERM
-
-          sleep infinity &
-          wait $!
-        resources:
-{{ toYaml .Values.sidecarResources | indent 10 }}
-        env:
-          - name: NODE_NAME
-            valueFrom:
-              fieldRef:
-                fieldPath: metadata.name
-        {{- if .Values.extraEnvs }}
-{{ toYaml .Values.extraEnvs | indent 10 }}
-        {{- end }}
-        {{- if .Values.envFrom }}
-        envFrom:
-{{ toYaml .Values.envFrom | indent 10 }}
-        {{- end }}
-      {{- end }}
-      {{- end }}
 {{- if .Values.lifecycle }}
         lifecycle:
 {{ toYaml .Values.lifecycle | indent 10 }}

elasticsearch/tests/elasticsearch_test.py

@@ -592,26 +592,6 @@ def test_adding_resources_to_initcontainer():
     }
 
 
-def test_adding_resources_to_sidecar_container():
-    config = """
-masterTerminationFix: true
-sidecarResources:
-  limits:
-    cpu: "100m"
-    memory: "128Mi"
-  requests:
-    cpu: "100m"
-    memory: "128Mi"
-"""
-    r = helm_template(config)
-    i = r["statefulset"][uname]["spec"]["template"]["spec"]["containers"][1]
-
-    assert i["resources"] == {
-        "requests": {"cpu": "100m", "memory": "128Mi"},
-        "limits": {"cpu": "100m", "memory": "128Mi"},
-    }
-
-
 def test_adding_a_node_affinity():
     config = """
 nodeAffinity:
@@ -937,23 +917,6 @@ def test_adding_load_balancer_source_ranges():
     assert ranges[1] == "192.168.1.0/24"
 
 
-def test_master_termination_fixed_enabled():
-    config = ""
-
-    r = helm_template(config)
-
-    assert len(r["statefulset"][uname]["spec"]["template"]["spec"]["containers"]) == 1
-
-    config = """
-    masterTerminationFix: true
-    """
-
-    r = helm_template(config)
-
-    c = r["statefulset"][uname]["spec"]["template"]["spec"]["containers"][1]
-    assert c["name"] == "elasticsearch-master-graceful-termination-handler"
-
-
 def test_lifecycle_hooks():
     config = ""
     r = helm_template(config)

elasticsearch/values.yaml

@@ -255,9 +255,6 @@ ingress:
 nameOverride: ""
 fullnameOverride: ""
 
-# https://github.com/elastic/helm-charts/issues/63
-masterTerminationFix: false
-
 lifecycle: {}
   # preStop:
   #   exec: