It is not possible to adjust arbiter's resource limits separately from cluster nodes

[anikievev]

We can not adjust resource limits for arbiter itself. Currently, it is just wasting resources, because we need arbiter only for election

Expected behavior:
We should be able to adjust it separately.

Currently, we use such yaml:

apiVersion: mongodbcommunity.mongodb.com/v1
kind: MongoDBCommunity
metadata:
  name: example-mongodb
spec:
  additionalMongodConfig:
    storage.wiredTiger.engineConfig.journalCompressor: zlib
  members: 2
  arbiters: 1
  security:
    authentication:
      ignoreUnknownUsers: true
      modes:
      - SCRAM
  type: ReplicaSet
  users:
  - db: admin
    name: user
    passwordSecretRef:
      name: user-password
    roles:
    - db: admin
      name: clusterAdmin
    - db: admin
      name: userAdminAnyDatabase

    scramCredentialsSecretName: my-scram
  
  statefulSet:
    spec:
      template:
        spec:
          # resources can be specified by applying an override
          # per container name.
          containers:
            - name: mongod
              resources:
                limits:
                  cpu: "8"
                  memory: 32G
                requests:
                  cpu: "8"
                  memory: 32G
  version: 4.4.13

[github-actions]

This issue is being marked stale because it has been open for 60 days with no activity. Please comment if this issue is still affecting you. If there is no change, this issue will be closed in 30 days.

[siegenthalerroger]

Not stale, still not possible

[github-actions]

This issue is being marked stale because it has been open for 60 days with no activity. Please comment if this issue is still affecting you. If there is no change, this issue will be closed in 30 days.

[pdfrod]

Still relevant.

[targs08]

Still relevant

[dan-mckean]

Hi, this isn't currently on our roadmap, but we do see the value in what's being asked.

We will do this at some point, but no current estimate for when.

[ajjaiii]

any update for this issue ?

[dosmanak]

Please implement the feature. I need to set Guaranteed QoS on mongo pods, but I can't reserve the same amount of CPUs for arbiter.

It should be enough to modify this part
https://github.com/mongodb/mongodb-kubernetes-operator/blob/master/controllers/replica_set_controller.go#L482