Scylla Summit 2022: What’s New in ScyllaDB Operator for Kubernetes
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This document summarizes the Scylla Operator for Kubernetes, including its developers, features, releases, and roadmap. Key points include: - The Scylla Operator manages and automates tasks for Scylla clusters on Kubernetes. - Features include seedless mode, security enhancements, performance tuning, and improved stability. - It follows a rapid 6-week release cycle and supports the latest two releases. - Future plans include additional performance optimizations, persistent storage support, TLS encryption, and multi-datacenter capabilities.
![Performance - experimental
Throughput 100% read - [kreq/s] 100% write - [kreq/s] 50% read 50% write - [kreq/s]
AWS 80 180 90
EKS 70 140 60
Latency
50% of throughput
p99 read - [ms] p99 write - [ms]
p99 mixed - [ms]
read write
AWS 3.63 6.05 5.27 2.96
EKS 5.0 8.1 6.80 4.10
Disk intensive workflow using 3 x i3.4xlarge](https://image.slidesharecdn.com/maciejzimnochtomasnozicka-scyllasummit2022-whatsnewinscyllaoperatorforkubernetes-220125175909/85/Scylla-Summit-2022-What-s-New-in-ScyllaDB-Operator-for-Kubernetes-11-320.jpg)
![Reconciliation
■ Scylla Operator has been rewritten in 1.4.0 using informers and other machinery that’s used by Kubernetes
controllers
● Cache based with optimistic concurrency and live calls on demand (same as Kubernetes controllers)
● 94% reduction of API calls made by the scylla cluster sidecars
● 82% reduction of API calls from the controller
● Less bug prone (typed)
● The machinery is battle tested by Kubernetes controllers
■ Full reconciliation [since 1.4.0]
● Any change to a field in the ScyllaCluster custom resource will be reconciled automatically
● Previously, only a few fields was supported to be changed and required dedicated logic
● Users can adjust resources, placement and repository spec [1.5.0]
■ Pruning old resources (e.g. services on scale down) [since 1.4.0]](https://image.slidesharecdn.com/maciejzimnochtomasnozicka-scyllasummit2022-whatsnewinscyllaoperatorforkubernetes-220125175909/85/Scylla-Summit-2022-What-s-New-in-ScyllaDB-Operator-for-Kubernetes-17-320.jpg)
![User experience
■ updatedMembers and stale fields help determine rack status more reliably [1.4.0]
■ ScyllaCluster.status supports observedGeneration API concept [1.4.0]
■ Users can now force a rolling restart of the ScyllaCluster by setting
spec.forceRedeploymentReason [1.4.0]
■ Validating webhooks now chain the errors (avoids iterating one by one) [1.5.0]](https://image.slidesharecdn.com/maciejzimnochtomasnozicka-scyllasummit2022-whatsnewinscyllaoperatorforkubernetes-220125175909/85/Scylla-Summit-2022-What-s-New-in-ScyllaDB-Operator-for-Kubernetes-18-320.jpg)
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Scylla Summit 2022: What’s New in ScyllaDB Operator for Kubernetes
- 1. What’s New in ScyllaDB Operator for Kubernetes Tomáš Nožička Maciej Zimnoch
- 2. Tomáš Nožička ■ Leads the development of Scylla Operator ■ Emeritus Kubernetes SIG-Apps approver ■ Used to work on a self-hosted, auto-upgrading Kubernetes control plane for RedHat OpenShift Principal Software Engineer
- 3. Maciej Zimnoch ■ Scylla Operator maintainer ■ Previously worked on Scylla Manager, Instant Messaging servers, SDN and LTE networks Senior Software Engineer YOUR PHOTO GOES HERE
- 4. About ■ Scylla Operator is a Kubernetes Operator for managing and automating tasks related to managing Scylla clusters. ■ https://github.com/scylladb/scylla-operator ■ https://operator.docs.scylladb.com
- 5. ScyllaCluster apiVersion: scylla.scylladb.com/v1 kind: ScyllaCluster metadata: name: my-summit-cluster spec: version: 4.5.1 agentVersion: 2.5.2 datacenter: name: us-east-1 racks: - name: us-east-1a members: 3 storage: capacity: 100Gi resources: limits: cpu: 8 memory: 16Gi
- 6. Releases Release GA EOL 1.0 2021-01-21 2021-05-06 1.1 2021-03-22 2021-06-17 1.2 2021-05-06 2021-08-10 1.3 2021-06-17 2021-09-16 1.4 2021-08-10 2021-12-03 1.5 2021-09-16 Release of 1.7 (TBA) 1.6 2021-12-03 Release of 1.8 1.7 TBA Release of 1.9 ■ 6 releases from the last summit ■ Aiming for ~6 weeks cadence (modulo PTOs, holidays, ..) ■ Supporting 2 latest releases ■ N-1 compatibility
- 7. Activity
- 9. Performance - experimental New CRD allowing to specify which K8s Nodes should be optimized. Available from: 1.6.0 apiVersion: scylla.scylladb.com/v1alpha1 kind: NodeConfig metadata: name: cluster spec: placement: nodeSelector: scylla.scylladb.com/node-type: scylla
- 10. Node 3 Performance - experimental apiVersion: scylla.scylladb.com/v1alpha1 kind: NodeConfig metadata: name: cluster spec: placement: nodeSelector: node-type: scylla Node 2 node-type: scylla Node 1 Node 4 node-type: scylla
- 11. Performance - experimental Throughput 100% read - [kreq/s] 100% write - [kreq/s] 50% read 50% write - [kreq/s] AWS 80 180 90 EKS 70 140 60 Latency 50% of throughput p99 read - [ms] p99 write - [ms] p99 mixed - [ms] read write AWS 3.63 6.05 5.27 2.96 EKS 5.0 8.1 6.80 4.10 Disk intensive workflow using 3 x i3.4xlarge
- 12. Performance IO Tune - 2 minute disk benchmark - is part of Scylla startup. Since 1.2.0 users may skip it by providing their precomputed values for known hardware types. From 1.7.0 benchmark result is cached in persistent location and reused on Scylla restarts.
- 13. Seedless mode Scylla nodes are not longer asymmetric. Seed nodes are no longer special. Deployment model doesn’t change, but no manual steps around seed nodes are no longer required. All nodes can be automatically replaced. Required minimum Scylla version: 4.3, 2021.1 Available from: 1.4.0
- 14. Security Image pull secrets added to CRD. Users may specify their private secure repository of Scylla images. Available from: 1.5.0 apiVersion: scylla.scylladb.com/v1 kind: ScyllaCluster metadata: name: my-summit-cluster spec: repository: custom-repo/scylla agentRepository: custom-repo/scylla-manager-agent imagePullSecrets: - name: repository-credentials
- 15. Security Communication with Scylla API is secured by token-based authentication. From 1.3.0 Operator automatically provisions Secret containing token, and configures endpoints. Available from: 1.3.0 Scylla Manager Agent secret token
- 16. Stability ■ 1.2.0 - Operator automatically provisions Pod Disruption Budget protecting Scylla nodes from being voluntary disrupted ■ 1.2.0 - Enhanced Operator deployment model ■ 1.4.0 - Operator Webhook was extracted into separate entity ■ 1.5.0 - Operator deployments are protected by Pod Disruption Budget
- 17. Reconciliation ■ Scylla Operator has been rewritten in 1.4.0 using informers and other machinery that’s used by Kubernetes controllers ● Cache based with optimistic concurrency and live calls on demand (same as Kubernetes controllers) ● 94% reduction of API calls made by the scylla cluster sidecars ● 82% reduction of API calls from the controller ● Less bug prone (typed) ● The machinery is battle tested by Kubernetes controllers ■ Full reconciliation [since 1.4.0] ● Any change to a field in the ScyllaCluster custom resource will be reconciled automatically ● Previously, only a few fields was supported to be changed and required dedicated logic ● Users can adjust resources, placement and repository spec [1.5.0] ■ Pruning old resources (e.g. services on scale down) [since 1.4.0]
- 18. User experience ■ updatedMembers and stale fields help determine rack status more reliably [1.4.0] ■ ScyllaCluster.status supports observedGeneration API concept [1.4.0] ■ Users can now force a rolling restart of the ScyllaCluster by setting spec.forceRedeploymentReason [1.4.0] ■ Validating webhooks now chain the errors (avoids iterating one by one) [1.5.0]
- 19. Testing ■ We’ve added an integrated end-to-end suite in 1.2.0 ■ Gradually increasing our coverage (in addition to QA coverage) ■ New features have to contain e2e tests ■ Tests run in parallel since 1.7.0
- 20. What’s next ■ Additional performance R&D ■ Persistent storage support ■ Managed TLS (internode + client) ■ Manual MultiDC ■ Managed MultiDC ■ Managed Scylla credentials ■ More deployments methods (OLM / OperatorHub, OpenShift Marketplace) ■ Supporting Azure Cloud ■ Autoscaling ■ And much more!
- 21. Thank you! Stay in touch [email protected] scylladb-users.slack.com #scylla-operator