Hao Liang's Blog

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【Scheduling】Co-Scheduling Grouped Batch Pod Scheduler Plugin

1. Background Related proposals: Kep: Coscheduling based on PodGroup CRD Source code address: Coscheduling In some scenarios (batch-running businesses such as Spark jobs and TensorFlow jobs), a group of Pods need to be scheduled successfully at the same time before they can run normally. Some Pods still cannot run normally after being scheduled successfully. The current Kubernetes native scheduler cannot ensure that a group of Pods is created before scheduling is started.

Posted by Hao Liang's Blog on Sunday, November 21, 2021

【Scheduling】Pod State Scheduling Scheduler plugin for scoring based on node pod status

This is the first scheduler plug-in I contributed to the scheduler-plugin open source project of the Kubernetes sig-scheduling group in 2020. 1. Background Related PR: PR103: Pod State Scheduling Plugin Source code address: Pod State Scheduling The current Kubernetes native scheduler scoring algorithm (Score) does not consider the existing Terminating status Pods on the node. The current Kubernetes native scheduler scoring algorithm (Score) does not consider the existing Nominated status Pods on the node.

Posted by Hao Liang's Blog on Sunday, October 24, 2021

【Scheduling】Capacity-scheduling Flexible Capacity Quota Scheduler Plugin

Recently, the 2021 North American KubeCon was held online. @denkensk and @yuanchen8911 are active contributors to the scheduler-plugin open source project of the Kubernetes sig-scheduling group. Brought a speech on the Capacity scheduling elastic capacity quota scheduler plug-in. 1. Background Related proposals: KEP9: Capacity scheduling. Source code address: Capacity scheduling The current Kubernetes native ResourceQuota quota mechanism is limited to a single namespace (ResourceQuota resource quota can only be configured for each namespace) When scheduling preemption occurs in a Pod, only the priority of its PriorityClass will be used as the criterion for whether to preempt it.

Posted by Hao Liang's Blog on Saturday, October 23, 2021

【Scheduling】Load-aware Load-awareness scheduler plugin

1. Background Related proposals: KEP61: Real Load Aware Scheduling. Source code address: Trimaran: Real Load Aware Scheduling The current Kubernetes native scheduling logic based on Pod Request and node Allocatable cannot truly reflect the real load of cluster nodes, so this scheduler plug-in takes the real load of nodes into the Pod scheduling logic. The core component of this plug-in Load Watcher comes from the open source project of paypal company.

Posted by Hao Liang's Blog on Tuesday, September 21, 2021