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Here’re the list of important and notable differences in processor and JobModel generation semantics between yarn and standalone deployment model:

• Number of processors of containers is a static configuration in yarn deployment model and a job restart is required to change the number of processorsit. However, an addition/deletion of a processor to a processors group in standalone is quite common and an expected behavior.
• A processor container is assigned a physical host by ContainerAllocator after the JobModel generation phase in yarn. Physical host in which a processor is going to run is known before the JobModel generation phase in standalone(ContainerAllocator phase is not needed in standalone to associate the processor with the physical host).

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