Updating volumes in YTsaurus services

This document explains how to change volume settings for YTsaurus services in Kubernetes.

Important considerations

When updating volumes:

1. The operator doesn’t apply updates automatically — it ignores changes to volume configurations. Changing the resource specification alone won’t trigger an update.
2. PVCs remain after deleting pods or StatefulSets, blocking new volume settings.

Procedure

To update volume settings:

Step 1. Disable the operator

Set isManaged: false in the YTsaurus resource specification to stop the operator from interfering with manual changes:

spec:
  isManaged: false

Apply the change to the cluster.

Step 2. Delete the StatefulSet

Delete the StatefulSet for the service whose volumes you’re updating:

kubectl delete statefulset <statefulset-name> -n <namespace>

Step 3. Delete Persistent Volume Claims

If your StatefulSet has multiple replicas, delete each associated PVC. To find relevant PVCs, run:

kubectl get pvc -n <namespace>

Then delete them:

kubectl delete pvc <pvc-name> -n <namespace>

Step 4. Enable the operator

Set isManaged: true in the YTsaurus resource specification:

spec:
  isManaged: true

Apply the change. The operator re‑creates the StatefulSet and PVCs with the new volume settings.

Example: Increasing space for scheduler logs

Suppose you need to increase scheduler log storage from 10 GB to 50 GB.

1. To specify the new volume size, update the YTsaurus resource specification:

spec:
  schedulers:
    volumeClaimTemplates:
      - spec:
          resources:
            requests:
              storage: 50Gi  # increased from 10Gi

2. Complete the update by:
   1. Setting isManaged: false.
   2. Deleting the StatefulSet and PVCs.
   3. Setting isManaged: true again.