Shulou(Shulou.com)06/03 Report--

MapReduce splits JobTracker into two separate components: resource management and task lifecycle management

MapReduce, known as MR2 or YARN in Hadoop2, splits resource management and task lifecycle management (including timed triggering and monitoring) in JobTracker into two separate services:

The ResourceManager for managing all resources and the ApplicationMaster,ResourceManager for managing each application are used to manage the allocation of computing resources to the application, and each ApplicationMaster is used to manage the application, scheduling, and coordination

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