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Posted to user@cassandra.apache.org by Manu Chadha <ma...@hotmail.com> on 2020/10/08 22:20:17 UTC

Does Cass-Operator create 3 100GB disk volume

Hi

I have created a cluster on GCP using Cass-Operator. While inspecting the cluster, I noticed that there are six 5GB disks and three 100 GB disks. I suppose the six 5GB disks belong to the 3 replicas. What created the 100GB disks ? If Cass-operator created them, what are they used for? What would be the storage capacity of the database now 5G per pod or something else?

[cid:image002.png@01D69DC9.925FD670]

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RE: Does Cass-Operator create 3 100GB disk volume

Posted by Manu Chadha <ma...@hotmail.com>.

Hi

The 100GB disks are getting created when I create the cluster –


gcloud container clusters create cassandra-cluster

Looks like it is not cass-operator issue as I didn’t create any cass-operator specific objects yet. Maybe K8s need these.

However, I do notice that even if I delete the cluster, the 5G disks persist. Shouldn’t these get deleted as the reclaimPolicy is delete in Storage.yaml?


apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: server-storage
provisioner: kubernetes.io/gce-pd
parameters:
  type: pd-ssd
  replication-type: none
volumeBindingMode: WaitForFirstConsumer
reclaimPolicy: Delete <-- shouldn’t this delete disks once the cluster is deleted?


thanks


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From: Manu Chadha<ma...@hotmail.com>
Sent: 08 October 2020 23:40
To: user@cassandra.apache.org<ma...@cassandra.apache.org>
Subject: RE: Does Cass-Operator create 3 100GB disk volume

Thanks. My suspicion is that some of these are old ones which didn’t get deleted. I have just deleted the cluster and all disks and will make it again tomorrow (almost midnight here). I’ll see how many disks get created and if they’ll get cleaned up as well if I delete the cluster.

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From: John Sanda<ma...@gmail.com>
Sent: 08 October 2020 23:38
To: user<ma...@cassandra.apache.org>
Subject: Re: Does Cass-Operator create 3 100GB disk volume

Can you share the spec of your CassandraDatacenter?

The operator creates 1 PersistenttVolumeClaim per C* node. This is where /var/lib/cassandra is mounted. This is where the commit log and data directory (SSTables) live.

If I create a CassandraDatacenter like this:

apiVersion: cassandra.datastax.com/v1beta1<http://cassandra.datastax.com/v1beta1>
kind: CassandraDatacenter
metadata:
  name: example
spec:
  clusterName: example
  serverType: cassandra
  serverVersion: 3.11.7
  managementApiAuth:
    insecure: {}
  size: 3
  allowMultipleNodesPerWorker: true
  storageConfig:
    cassandraDataVolumeClaimSpec:
      storageClassName: server-storage
      accessModes:
      - ReadWriteOnce
      resources:
        requests:
          storage: 5Gi

Then the operator should create 3 PVCs that are bound to volumes with a capacity of 5Gi.

On Thu, Oct 8, 2020 at 6:20 PM Manu Chadha <ma...@hotmail.com>> wrote:
Hi

I have created a cluster on GCP using Cass-Operator. While inspecting the cluster, I noticed that there are six 5GB disks and three 100 GB disks. I suppose the six 5GB disks belong to the 3 replicas. What created the 100GB disks ? If Cass-operator created them, what are they used for? What would be the storage capacity of the database now 5G per pod or something else?

[cid:image003.png@01D69E1E.23956890]

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10



--

- John

RE: Does Cass-Operator create 3 100GB disk volume

Posted by Manu Chadha <ma...@hotmail.com>.

Thanks. My suspicion is that some of these are old ones which didn’t get deleted. I have just deleted the cluster and all disks and will make it again tomorrow (almost midnight here). I’ll see how many disks get created and if they’ll get cleaned up as well if I delete the cluster.

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: John Sanda<ma...@gmail.com>
Sent: 08 October 2020 23:38
To: user<ma...@cassandra.apache.org>
Subject: Re: Does Cass-Operator create 3 100GB disk volume

Can you share the spec of your CassandraDatacenter?

The operator creates 1 PersistenttVolumeClaim per C* node. This is where /var/lib/cassandra is mounted. This is where the commit log and data directory (SSTables) live.

If I create a CassandraDatacenter like this:

apiVersion: cassandra.datastax.com/v1beta1<http://cassandra.datastax.com/v1beta1>
kind: CassandraDatacenter
metadata:
  name: example
spec:
  clusterName: example
  serverType: cassandra
  serverVersion: 3.11.7
  managementApiAuth:
    insecure: {}
  size: 3
  allowMultipleNodesPerWorker: true
  storageConfig:
    cassandraDataVolumeClaimSpec:
      storageClassName: server-storage
      accessModes:
      - ReadWriteOnce
      resources:
        requests:
          storage: 5Gi

Then the operator should create 3 PVCs that are bound to volumes with a capacity of 5Gi.

On Thu, Oct 8, 2020 at 6:20 PM Manu Chadha <ma...@hotmail.com>> wrote:
Hi

I have created a cluster on GCP using Cass-Operator. While inspecting the cluster, I noticed that there are six 5GB disks and three 100 GB disks. I suppose the six 5GB disks belong to the 3 replicas. What created the 100GB disks ? If Cass-operator created them, what are they used for? What would be the storage capacity of the database now 5G per pod or something else?

[cid:image002.png@01D69DCC.68C7C4A0]

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

--

- John

Re: Does Cass-Operator create 3 100GB disk volume

Posted by John Sanda <jo...@gmail.com>.

Can you share the spec of your CassandraDatacenter?

The operator creates 1 PersistenttVolumeClaim per C* node. This is where
/var/lib/cassandra is mounted. This is where the commit log and data
directory (SSTables) live.

If I create a CassandraDatacenter like this:

apiVersion: cassandra.datastax.com/v1beta1
kind: CassandraDatacenter
metadata:
  name: example
spec:
  clusterName: example
  serverType: cassandra
  serverVersion: 3.11.7
  managementApiAuth:
    insecure: {}
  size: 3
  allowMultipleNodesPerWorker: true
  storageConfig:
    cassandraDataVolumeClaimSpec:
      storageClassName: server-storage
      accessModes:
      - ReadWriteOnce
      resources:
        requests:
          storage: 5Gi

Then the operator should create 3 PVCs that are bound to volumes with a
capacity of 5Gi.

On Thu, Oct 8, 2020 at 6:20 PM Manu Chadha <ma...@hotmail.com> wrote:

> Hi
>
>
>
> I have created a cluster on GCP using Cass-Operator. While inspecting the
> cluster, I noticed that there are six 5GB disks and three 100 GB disks. I
> suppose the six 5GB disks belong to the 3 replicas. What created the 100GB
> disks ? If Cass-operator created them, what are they used for? What would
> be the storage capacity of the database now 5G per pod or something else?
>
>
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>

-- 

- John