异常：
REDUCE capability required is more than the supported max container capability in the cluster. Killing the Job. reduceResourceRequest: <memory:12160, vCores:1> maxContainerCapability:<memory:8192, vCores:24>
需要调整两个参数：
yarn.nodemanager.resource.memory-mb yarn.scheduler.maximum-allocation-mb 注意：如果只设置其中一个，可能依然存在同样的报错转载于:https://www.cnblogs.com/yako/p/5498168.html
