65 lines
3.8 KiB
Markdown
65 lines
3.8 KiB
Markdown
# What's New
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## Upgrading support
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Users are now able to upgrade from the previous version smoothly. With the
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[multiple version](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definition-versioning/#specify-multiple-versions)
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feature of CRD,
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objects with different schemas can be automatically converted between versions. Karmada uses the [semantic
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versioning](https://semver.org/) and will provide workarounds for inevitable breaking changes.
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In this release, the ResourceBining and ClusterResourceBinding promote to v1alpha2 and the previous v1alpha1
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version is still available for one more release. With the
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[upgrading instruction](https://github.com/karmada-io/karmada/tree/9126cffa218871e921510d3deb1b185c8a4dee3d/docs/upgrading),
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the previous version of
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Karmada can promote smoothly.
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## Introduced karmada-scheduler-estimator to facilitate end-to-end scheduling accuracy
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Karmada scheduler aims to assign workload to clusters according to constraints and available resources of
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each member cluster. The `kube-scheduler` working on each cluster takes the responsibility to assign Pods
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to Nodes.
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Even though Karmada has the capacity to reschedule failure workload between member clusters, but the
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community still commits lots of effort to improve the accuracy of the end-to-end scheduling.
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The `karmada-scheduler-estimator` is the effective assistant of `karmada-scheduler`, it provides
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prediction-based scheduling decisions that can significantly improve the scheduling efficiency and
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avoid the wave of rescheduling among clusters. Note that this feature is implemented as
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a pluggable add-on. For the instructions please refer to
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[scheduler estimator guideline](https://github.com/karmada-io/karmada/blob/9126cffa218871e921510d3deb1b185c8a4dee3d/docs/scheduler-estimator.md).
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## Maintainability improvements
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A bunch of significant maintainability improvements were added to this release, including:
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Simplified Karmada installation with
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[helm chart](https://github.com/karmada-io/karmada/tree/9126cffa218871e921510d3deb1b185c8a4dee3d/charts).
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Provided metrics to observe scheduler status, the metrics API now served at `/metrics` of `karmada-scheduler`.
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With these metrics, users are now able to evaluate the scheduler's performance and identify the bottlenecks.
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Provided events to Karmada API objects as supplemental information to debug problems.
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# Other Notable Changes
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- karmada-controller-manager: The ResourceBinding/ClusterResourceBinding won't be deleted after associate
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PropagationPolicy/ClusterPropagationPolicy is removed and is still available until resource template is
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removed.([#601](https://github.com/karmada-io/karmada/pull/601))
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- Introduced --leader-elect-resource-namespace which is used to specify the namespace of election object
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to components karmada-controller-manager/karmada-scheduler/karmada-agent`.
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([#698](https://github.com/karmada-io/karmada/pull/698))
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- Deprecation: The API ReplicaSchedulingPolicy has been deprecated and will be removed from the following
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release. The feature now has been integrated into ReplicaScheduling.
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- Introduced kubectl-karmada commands as the extensions for kubectl.
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([#686](https://github.com/karmada-io/karmada/pull/686))
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- karmada-controller-manager introduced a version command to represent version information.
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([#717](https://github.com/karmada-io/karmada/pull/717) )
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- karmada-scheduler/karmada-webhook/karmada-agent/karmada-scheduler-estimator introduced a version command to
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represent version information. ([#719](https://github.com/karmada-io/karmada/pull/719) )
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- Provided instructions about how to use the Submariner to connect the network between member
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clusters. ([#737](https://github.com/karmada-io/karmada/pull/737) )
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- Added four metrics to the karmada-scheduler to monitor scheduler performance.
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([#747](https://github.com/karmada-io/karmada/pull/747))
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