add placement performance report #354
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Signed-off-by: ldpliu <daliu@redhat.com>
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| ## 概要 | ||
| 在`open-cluster-management`中，集群调度通过placement进行。Placement可以从一个或多个集群集中选取一组目标集群。选出的结果会被存储到另一个叫PlacementDecision的api。placement 从三个维度定义了目标集群的选择： | ||
| - Predicates（requiredClusterSelector）：Predicates中可以定义一组labelSelector和claimSelector。即可以通过集群的label 和集群claim 信息选择目标集群。 | ||
| - Taints/Tolerations：通过Taints/Tolerations，用户可以避免选择到一些不健康或者不可达的集群。用户还可以定义自己的taint从而避免特定属性的集群被选择。这对用户想要设置一个集群为maintenance mode，然后在这个集群上清楚负载是非常有用。 |
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Taints/Tolerations can be used to select and prefer clusters, I'm thinking make it part of Predicates and Prioritizers is better than listing it separately.
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