情况1:
In order to change the average load for a reducer (in bytes):
set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
set mapreduce.job.reduces=<number>
卡在这里不动，大致原因：内存不足，方法，关闭其他任务，重启集群后解决；
情况2：
卡在这里：
Starting Job = job_1604227043139_0001, Tracking URL = http://hadoop103:8088/proxy/application_1604227043139_0001/
Kill Command = /opt/module/hadoop-3.1.3/bin/mapred job -kill job_1604227043139_0001
原因：
有一个 节点的NodeManager 挂掉了。
执行：yarn --daemon start nodemanager
把它启动起来就好了；
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