incubator/cassandra

Chart version: 0.15.4
Api version: v1
App version: 3.11.6
DEPRECATED Apache Cassandra is a free and open-source distribut...
application
Chart Type
DEPRECATED
Status
Unknown
License
13016
Downloads
https://charts.helm.sh/incubator
Set me up:
helm repo add center https://repo.chartcenter.io
Install Chart:
helm install cassandra center/incubator/cassandra
Versions (0)

⚠️ Repo Archive Notice

As of Nov 13, 2020, charts in this repo will no longer be updated. For more information, see the Helm Charts Deprecation and Archive Notice, and Update.

Cassandra

A Cassandra Chart for Kubernetes

DEPRECATION NOTICE

This chart is deprecated and no longer supported.

Install Chart

To install the Cassandra Chart into your Kubernetes cluster (This Chart requires persistent volume by default, you may need to create a storage class before install chart. To create storage class, see Persist data section)

helm install --namespace "cassandra" -n "cassandra" incubator/cassandra

After installation succeeds, you can get a status of Chart

helm status "cassandra"

If you want to delete your Chart, use this command

helm delete  --purge "cassandra"

Upgrading

To upgrade your Cassandra release, simply run

helm upgrade "cassandra" incubator/cassandra

0.12.0

This version fixes https://github.com/helm/charts/issues/7803 by removing mutable labels in spec.VolumeClaimTemplate.metadata.labels so that it is upgradable.

Until this version, in order to upgrade, you have to delete the Cassandra StatefulSet before upgrading:

$ kubectl delete statefulset --cascade=false my-cassandra-release

Persist data

You need to create StorageClass before able to persist data in persistent volume. To create a StorageClass on Google Cloud, run the following

kubectl create -f sample/create-storage-gce.yaml

And set the following values in values.yaml

persistence:
  enabled: true

If you want to create a StorageClass on other platform, please see documentation here https://kubernetes.io/docs/user-guide/persistent-volumes/

When running a cluster without persistence, the termination of a pod will first initiate a decommissioning of that pod. Depending on the amount of data stored inside the cluster this may take a while. In order to complete a graceful termination, pods need to get more time for it. Set the following values in values.yaml:

podSettings:
  terminationGracePeriodSeconds: 1800

Install Chart with specific cluster size

By default, this Chart will create a cassandra with 3 nodes. If you want to change the cluster size during installation, you can use --set config.cluster_size={value} argument. Or edit values.yaml

For example: Set cluster size to 5

helm install --namespace "cassandra" -n "cassandra" --set config.cluster_size=5 incubator/cassandra/

Install Chart with specific resource size

By default, this Chart will create a cassandra with CPU 2 vCPU and 4Gi of memory which is suitable for development environment. If you want to use this Chart for production, I would recommend to update the CPU to 4 vCPU and 16Gi. Also increase size of max_heap_size and heap_new_size. To update the settings, edit values.yaml

Install Chart with specific node

Sometime you may need to deploy your cassandra to specific nodes to allocate resources. You can use node selector by edit nodes.enabled=true in values.yaml For example, you have 6 vms in node pools and you want to deploy cassandra to node which labeled as cloud.google.com/gke-nodepool: pool-db

Set the following values in values.yaml

nodes:
  enabled: true
  selector:
    nodeSelector:
      cloud.google.com/gke-nodepool: pool-db

Configuration

The following table lists the configurable parameters of the Cassandra chart and their default values.

Parameter Description Default
image.repo cassandra image repository cassandra
image.tag cassandra image tag 3.11.5
image.pullPolicy Image pull policy Always if imageTag is latest, else IfNotPresent
image.pullSecrets Image pull secrets nil
config.cluster_domain The name of the cluster domain. cluster.local
config.cluster_name The name of the cluster. cassandra
config.cluster_size The number of nodes in the cluster. 3
config.seed_size The number of seed nodes used to bootstrap new clients joining the cluster. 2
config.seeds The comma-separated list of seed nodes. Automatically generated according to .Release.Name and config.seed_size
config.num_tokens Initdb Arguments 256
config.dc_name Initdb Arguments DC1
config.rack_name Initdb Arguments RAC1
config.endpoint_snitch Initdb Arguments SimpleSnitch
config.max_heap_size Initdb Arguments 2048M
config.heap_new_size Initdb Arguments 512M
config.ports.cql Initdb Arguments 9042
config.ports.thrift Initdb Arguments 9160
config.ports.agent The port of the JVM Agent (if any) nil
config.start_rpc Initdb Arguments false
configOverrides Overrides config files in /etc/cassandra dir {}
commandOverrides Overrides default docker command []
argsOverrides Overrides default docker args []
env Custom env variables {}
schedulerName Name of k8s scheduler (other than the default) nil
persistence.enabled Use a PVC to persist data true
persistence.storageClass Storage class of backing PVC nil (uses alpha storage class annotation)
persistence.accessMode Use volume as ReadOnly or ReadWrite ReadWriteOnce
persistence.size Size of data volume 10Gi
resources CPU/Memory resource requests/limits Memory: 4Gi, CPU: 2
service.type k8s service type exposing ports, e.g. NodePort ClusterIP
service.annotations Annotations to apply to cassandra service ""
podManagementPolicy podManagementPolicy of the StatefulSet OrderedReady
podDisruptionBudget Pod distruption budget {}
podAnnotations pod annotations for the StatefulSet {}
updateStrategy.type UpdateStrategy of the StatefulSet OnDelete
livenessProbe.initialDelaySeconds Delay before liveness probe is initiated 90
livenessProbe.periodSeconds How often to perform the probe 30
livenessProbe.timeoutSeconds When the probe times out 5
livenessProbe.successThreshold Minimum consecutive successes for the probe to be considered successful after having failed. 1
livenessProbe.failureThreshold Minimum consecutive failures for the probe to be considered failed after having succeeded. 3
readinessProbe.initialDelaySeconds Delay before readiness probe is initiated 90
readinessProbe.periodSeconds How often to perform the probe 30
readinessProbe.timeoutSeconds When the probe times out 5
readinessProbe.successThreshold Minimum consecutive successes for the probe to be considered successful after having failed. 1
readinessProbe.failureThreshold Minimum consecutive failures for the probe to be considered failed after having succeeded. 3
readinessProbe.address Address to use for checking node has joined the cluster and is ready. ${POD_IP}
rbac.create Specifies whether RBAC resources should be created true
serviceAccount.create Specifies whether a ServiceAccount should be created true
serviceAccount.name The name of the ServiceAccount to use
backup.enabled Enable backup on chart installation false
backup.schedule Keyspaces to backup, each with cron time
backup.annotations Backup pod annotations iam.amazonaws.com/role: cain
backup.image.repository Backup image repository maorfr/cain
backup.image.tag Backup image tag 0.6.0
backup.extraArgs Additional arguments for cain []
backup.env Backup environment variables AWS_REGION: us-east-1
backup.resources Backup CPU/Memory resource requests/limits Memory: 1Gi, CPU: 1
backup.destination Destination to store backup artifacts s3://bucket/cassandra
backup.google.serviceAccountSecret Secret containing credentials if GCS is used as destination
exporter.enabled Enable Cassandra exporter false
exporter.servicemonitor.enabled Enable ServiceMonitor for exporter true
exporter.servicemonitor.additionalLabels Additional labels for Service Monitor {}
exporter.image.repo Exporter image repository criteord/cassandra_exporter
exporter.image.tag Exporter image tag 2.0.2
exporter.port Exporter port 5556
exporter.jvmOpts Exporter additional JVM options
exporter.resources Exporter CPU/Memory resource requests/limits {}
extraContainers Sidecar containers for the pods []
extraVolumes Additional volumes for the pods []
extraVolumeMounts Extra volume mounts for the pods []
affinity Kubernetes node affinity {}
tolerations Kubernetes node tolerations []

Scale cassandra

When you want to change the cluster size of your cassandra, you can use the helm upgrade command.

helm upgrade --set config.cluster_size=5 cassandra incubator/cassandra

Get cassandra status

You can get your cassandra cluster status by running the command

kubectl exec -it --namespace cassandra $(kubectl get pods --namespace cassandra -l app=cassandra-cassandra -o jsonpath='{.items[0].metadata.name}') nodetool status

Output

Datacenter: asia-east1
======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens       Owns (effective)  Host ID                               Rack
UN  10.8.1.11  108.45 KiB  256          66.1%             410cc9da-8993-4dc2-9026-1dd381874c54  a
UN  10.8.4.12  84.08 KiB  256          68.7%             96e159e1-ef94-406e-a0be-e58fbd32a830  c
UN  10.8.3.6   103.07 KiB  256          65.2%             1a42b953-8728-4139-b070-b855b8fff326  b

Benchmark

You can use cassandra-stress tool to run the benchmark on the cluster by the following command

kubectl exec -it --namespace cassandra $(kubectl get pods --namespace cassandra -l app=cassandra-cassandra -o jsonpath='{.items[0].metadata.name}') cassandra-stress

Example of cassandra-stress argument - Run both read and write with ration 9:1 - Operator total 1 million keys with uniform distribution - Use QUORUM for read/write - Generate 50 threads - Generate result in graph - Use NetworkTopologyStrategy with replica factor 2

cassandra-stress mixed ratio\(write=1,read=9\) n=1000000 cl=QUORUM -pop dist=UNIFORM\(1..1000000\) -mode native cql3 -rate threads=50 -log file=~/mixed_autorate_r9w1_1M.log -graph file=test2.html title=test revision=test2 -schema "replication(strategy=NetworkTopologyStrategy, factor=2)"