我遵循了这个步骤post:httphttp://hanslen.me/2018/01/19/how-to-install-hadoop-on-macos-high-sierra/在本地计算机上启动hadoop。但是，我在尝试启动namenode和datanode时遇到了这个错误。我确实尝试设置了中第一个解决方案给出的路径：hdfs\u namenode\u user、hdfs\u datanode\u user和hdfs\u secondarynamenode\u user未定义，但似乎没有帮助。我不断得到以下错误：

Starting namenodes on [localhost]
    ERROR: Attempting to operate on hdfs namenode as root
    ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
 Starting datanodes
    ERROR: Attempting to operate on hdfs datanode as root
    ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
Starting secondary namenodes [BANL160658074.local]
        ERROR: Attempting to operate on hdfs secondarynamenode as root
        ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation

有什么建议吗？
编辑：添加core-site.xml和hdfs-site.xml
core-site.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
    <configuration>
    <property>
            <name>hadoop.tmp.dir</name>
            <value>/usr/local/Cellar/hadoop/hdfs/tmp</value>
            <description>A base for other temporary directories.</description>
        </property>
        <property>
            <name>fs.default.name</name>
            <value>hdfs://localhost:8020</value>
        </property>
    </configuration>

hdfs-site.xml文件

<configuration>
 <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
</configuration>