The auxService:mapreduce_shuffle does not exist

解决办法是:
vim etc/hadoop/yarn-site.xml 
<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value> --------注意事项:是mapreduce_shuffle 不是 mapreduce.shuffle
</property>
然后重新启动 hadoop 即可。

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