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  • 单体调度
  • 两层调度
  • 共享状态调度
  • 对比

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  1. Computer Science
  2. Distributed System

Scheduling

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Last updated 4 years ago

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为任务寻找合适的服务器,叫做调度。

单体调度

集群中仅一个节点运行调度进程,调度器同时管理任务和资源,拥有资源和任务的全局视图。

调度算法一般包括两个阶段:

  • 可行性检查,找到多台可以运行任务的机器。

  • 评分,从多台中选择一台。又分为“最差匹配”和“最佳匹配”两种。

若是有多个集群,则通过集群联邦来实现单体调度。集群联邦就是单体调度的分层实现。

两层调度

两层调度的第一层是中央调度器,只负责资源的管理和分配;第二层只能获得部分的资源视图,负责任务与资源匹配。

共享状态调度

有多个调度器,共享集群状态,包括资源状态和任务状态。通过乐观并发调度来解决冲突,而双层调度是悲观的并发调度。

对比