Vitess memory issue

gistfile1.txt

topology:
  cells:
    - name: "zone1"
      etcd:
        replicas: 3
      vtctld:
        replicas: 1
      vtgate:
        replicas: 2
      mysqlProtocol:
        enabled: true
        authType: "none"
      keyspaces:
        - name: "my_db"
          shards:
            - name: "0"
              tablets:
                - type: "replica"
                  vttablet:
                    replicas: 3

etcd:
  replicas: 3
  resources:

vtctld:
  serviceType: "NodePort"
  resources:

vtgate:
  serviceType: "NodePort"
  extraFlags:
    mysql_server_version: "5.7.24-Vitess"
  resources:
    limits:
      cpu: 4
      memory: 3G

vttablet:
  mysqlImage: mysql:5.7.24
  resources:
    limits:
      cpu: 3
      memory: 8Gi
  extraMyCnf: extra-vttablet-mycnf
  mysqlResources:
    limits:
      cpu: 3
      memory: 8Gi
  dataVolumeClaimSpec:
    storageClassName: "fast-extensible"
    accessModes: ["ReadWriteOnce"]
    resources:
      requests:
        storage: "300Gi"

vtworker:
  resources:

pmm:
  enabled: true

orchestrator:
  enabled: true