【Spark2运算效率】第二节 影响生产集群运算效率之集群设置前言IO（磁盘IO及网络IO）yarn.nodemanager.resource.memory-mbyarn.nodemanager.resource.cpu-vcoresyarn.nodemanager.vmem-pmem-ratioyarn.scheduler.minimum-allocation-mbyarn.scheduler.maximum-allocation-mbyarn.scheduler.maximum-alloca