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The use of collective APIs as the primary user-facing primitive is relatively common among cluster scheduling systems, including [Borg](https://research.google.com/pubs/pub43438.html), [Marathon](https://mesosphere.github.io/marathon/docs/rest-api.html), [Aurora](http://aurora.apache.org/documentation/latest/reference/configuration/#job-schema), and [Tupperware](http://www.slideshare.net/Docker/aravindnarayanan-facebook140613153626phpapp02-37588997).
Pod is exposed as a primitive in order to facilitate:
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Pod 原语有利于:
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-scheduler and controller pluggability
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-support for pod-level operations without the need to "proxy" them via controller APIs
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-decoupling of pod lifetime from controller lifetime, such as for bootstrapping
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-decoupling of controllers and services — the endpoint controller just watches pods
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-clean composition of Kubelet-level functionality with cluster-level functionality — Kubelet is effectively the "pod controller"
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-high-availability applications, which will expect pods to be replaced in advance of their termination and certainly in advance of deletion, such as in the case of planned evictions, image prefetching, or live pod migration [#3949](http://issue.k8s.io/3949)
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